MAX3224E_V01 [MAXIM]
±15kV ESD-Protected, 1μA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus;
| 型号： | MAX3224E_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | ±15kV ESD-Protected, 1μA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus |
| 文件： | 总25页 (文件大小：2789K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
General Description
Next Generation Device Features
● For Space-Constrained Applications:
The MAX3224E/MAX3225E/MAX3226E/MAX3227E/
MAX3244E/MAX3245E are 3V-powered EIA/TIA-232 and
V.28/V.24 communications interfaces with automatic shut-
down/wakeup features, high data-rate capabilities, and
enhanced electrostatic discharge (ESD) protection. All
transmitter outputs and receiver inputs are protected to
±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using
IEC 1000-4-2 Contact Discharge, and ±15kV using the
Human Body Model.
MAX3228E/MAX3229E: ±15kV ESD-Protected,
+2.5V to +5.5V, RS-232 Transceivers in UCSP™
MAX3222E/MAX3232E/MAX3241E/MAX3246E:
±15kV ESD-Protected, Down to 10nA, +3.0V to
+5.5V, Up to 1Mbps, True RS-232 Transceivers
(MAX3246E Available in UCSP)
● For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1μA,
2Tx/2Rx RS-232 Transceivers with ±15kV
ESD-Protected I/O and Logic Pins
All devices achieve a 1μA supply current using Maxim’s
revolutionary AutoShutdown Plus™ feature. These devic-
es automatically enter a low-power shutdown mode when
the RS-232 cable is disconnected or the transmitters of
the connected peripherals are inactive, and the UART
driving the transmitter inputs is inactive for more than 30
seconds. They turn on again when they sense a valid
transition at any transmitter or receiver input.
AutoShutdown Plus saves power without changes to the
existing BIOS or operating system.
Ordering Information
PART
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
20 TQFN-EP*
20 TSSOP
MAX3224ECTP+
MAX3224ECUP+
MAX3224ECAP+
MAX3224ECPP+
MAX3224EETP+
MAX3224EEUP+
MAX3224EEAP+
MAX3224EEPP+
MAX3224EAAP+
0°C to +70°C
0°C to +70°C
20 SSOP
0°C to +70°C
20 Plastic DIP
20 TQFN-EP*
20 TSSOP
The MAX3225E/MAX3227E/MAX3245E also fea-
ture MegaBaud™ operation, guaranteeing 1Mbps for
high-speed applications such as communicating with
ISDN modems. The MAX3224E/MAX3226E/MAX3244E
guarantee 250kbps operation. The transceivers have a
proprietary low-dropout transmitter output stage enabling
true RS-232 performance from a +3.0V to +5.5V supply
with a dual charge pump. The charge pump requires only
four small 0.1μF capacitors for operation from a 3.3V
supply. The MAX3224E–MAX3227E feature a logic-level
output (READY) that asserts when the charge pump is
regulating and the device is ready to begin transmitting.
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
20 SSOP
20 Plastic DIP
20 SSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Selector Guide
All devices are available in a space-saving TQFN,
SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/
MAX3245E) packages.
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
Auto-
Shutdown
Plus
READY
OUTPUT
PART
Applications
● Notebook, Subnotebook, and Palmtop Computers
● Cellular Phones
● Battery-Powered Equipment
● Hand-Held Equipment
● Peripherals
● Printers
● Automotive
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
2/2
2/2
1/1
1/1
3/5
3/5
250k
1M
ü
ü
ü
ü
—
—
ü
ü
ü
ü
ü
ü
250k
1M
250k
1M
AutoShutdown Plus, MegaBaud, and UCSP are trademarks of
Maxim Integrated Products, Inc.
19-1339; Rev 11; 11/18
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Absolute Maximum Ratings
V
to GND ............................................................-0.3V to +6V
20-Pin TQFN (derate 21.3mW/°C above +70°C) ....1702.1mW
20-Pin Plastic DIP
CC
V+ to GND (Note 1).................................................-0.3V to +7V
V- to GND (Note 1)..................................................+0.3V to -7V
V+ +│V-│(Note 1)................................................................+13V
Input Voltages
T_IN, FORCEON, FORCEOFF to GND..............-0.3V to +6V
R_IN to GND ...................................................................±25V
Output Voltages
(derate 11.11mW/°C above +70°C) ............................889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C)........640mW
20-Pin TSSOP (derate 11mW/°C above +70°C).....879.1 mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C) ..........1W
28-Pin SSOP (derate 9.1mW/°C above +70°C).......727.3mW
28-Pin TSSOP (derate 14mW/°C above +70°C)....1025.6mW
36-Pin TQFN (derate 26.3mW/°C above +70°C) ..... 2105.3mW
Operating Temperature Ranges
MAX32_ _EC_ _.................................................0°C to +70°C
MAX32_ _EE_ _............................................. -40°C to +85°C
MAX32_ _EAA_............................................ -40°C to +125°C
Storage Temperature Range............................ -65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow).......................................+260°C
T_OUT to GND.............................................................±13.2V
R_OUT, INVALID, READY to GND ...... -0.3V to (V
+ 0.3V)
CC
Short-Circuit Duration
T_OUT to GND......................................................Continuous
Continuous Power Dissipation (T = +70°C)
A
16-Pin SSOP (derate 7.10mW/°C above +70°C).....571.4mW
16-Pin TSSOP (derate 9.4 mW/°C above +70°C)....754.7mW
16-Pin TQFN (derate 20.8mW/°C above +70°C)...1666.7mW
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
16-SSOP
PACKAGE CODE
A16+2
Outline Number
21-0056
90-0106
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
140
34
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
86
33
JA
Junction to Case (θ
)
JC
16-TSSOP
PACKAGE CODE
U16+1
Outline Number
21-0066
90-0117
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
106
27
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
90
27
JA
Junction to Case (θ
)
JC
Maxim Integrated
│ 2
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Package Information (continued)
16-TQFN-EP
PACKAGE CODE
T1655+2
Outline Number
21-0140
90-0072
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
48
2
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
30
2
JA
Junction to Case (θ
)
JC
20-DIP
PACKAGE CODE
P20+3
Outline Number
21-0043
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
90
30
JA
Junction to Case (θ
)
JC
20-SSOP
PACKAGE CODE
A20+1
Outline Number
21-0056
90-0094
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
125
32
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
84
33
JA
Junction to Case (θ
)
JC
Maxim Integrated
│ 3
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Package Information (continued)
20-TSSOP
PACKAGE CODE
U20+2
Outline Number
21-0066
90-0116
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
91
20
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
73.8
20
JA
Junction to Case (θ
)
JC
20-TQFN-EP
PACKAGE CODE
T2055+5
21-0140
90-0010
Outline Number
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
47
2
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
29
2
JA
Junction to Case (θ
)
JC
28-WIDE SO
PACKAGE CODE
W28+6
21-0042
90-0109
Outline Number
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
80
18
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
59
18
JA
Junction to Case (θ
)
JC
Maxim Integrated
│ 4
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Package Information (continued)
28-SSOP
PACKAGE CODE
A28+1
Outline Number
21-0056
90-0095
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
110
25
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
67.1
25
JA
Junction to Case (θ
)
JC
28-TSSOP
PACKAGE CODE
U28+2
Outline Number
21-0066
90-0171
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
78
13
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
71.6
13
JA
Junction to Case (θ
)
JC
36-TQFN
PACKAGE CODE
T3666+3
21-0141
90-0050
Outline Number
Land Pattern Number
Thermal Resistance, Single layer board:
Junction to Ambient (θ
)
38
1
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-layer board:
Junction to Ambient (θ
)
28
1
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Maxim Integrated
│ 5
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Electrical Characteristics
CC
(V
= +3V to +5.5V, C1–C4 = 0.1μF, tested at 3.3V ±10%; C = 0.047μF, C2–C4 = 0.33μF, tested at 5.0V ±10%; T = T
to T
MAX
,
1
A
MIN
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
= 3.3V or 5.0V, T = +25°C)
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V
CC
A
Supply Current,
AutoShutdown Plus
FORCEON = GND, FORCEOFF = V
all R_IN idle, all T_IN idle
,
CC
1
1
10
10
1
μA
μA
Supply Current, Shutdown
Supply Current,
FORCEOFF = GND
FORCEON = FORCEOFF = V , no load
0.3
mA
CC
AutoShutdown Plus Disabled
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
T_IN, FORCEON, FORCEOFF
0.8
V
V
V
= 3.3V
= 5.0V
2
CC
CC
T_IN, FORCEON,
Input Logic Threshold High
FORCEOFF
V
2.4
Transmitter Input Hysteresis
0.5
V
Input Leakage Current
T_IN, FORCEON, FORCEOFF
±0.01
±1
±10
0.4
μA
R_OUT (MAX3244E/MAX3245E),
receivers disabled
Output Leakage Current
Output Voltage Low
Output Voltage High
±0.05
μA
V
I
I
= 1.6mA
= -1.0mA
OUT
OUT
V
- 0.6
V
CC
- 0.1
CC
V
RECEIVER INPUTS
Input Voltage Range
-25
0.6
0.8
+25
V
V
V
V
V
V
= 3.3V
= 5.0V
= 3.3V
= 5.0V
1.2
1.5
1.5
1.8
0.5
5
CC
CC
CC
CC
Input Threshold Low
T
T
= +25°C
A
2.4
2.4
Input Threshold High
= +25°C
= +25°C
V
A
Input Hysteresis
V
Input Resistance
T
3
7
kΩ
A
TRANSMITTER OUTPUTS
All transmitter outputs loaded with 3kΩ
to ground
Output Voltage Swing
±5
±5.4
10M
V
Output Resistance
V
= V+ = V- = 0V, transmitter outputs = ±2V
300
Ω
CC
Output Short-Circuit Current
±60
±25
mA
V
= 0V or 3V to 5.5V, V
= ±12V,
CC
OUT
Output Leakage Current
µA
Transmitters disabled
Maxim Integrated
│
6
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Electrical Characteristics (continued)
CC
(V
= +3V to +5.5V, C1–C4 = 0.1μF, tested at 3.3V ±10%; C = 0.047μF, C2–C4 = 0.33μF, tested at 5.0V ±10%; T = T
to T
MAX
,
1
A
MIN
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MOUSE DRIVEABILITY (MAX3244E/MAX3245E)
T1IN = T2IN = GND, T3IN = V
,
CC
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with
2.5mA each
Transmitter Output Voltage
±5
V
ESD PROTECTION
IEC 1000-4-2 Air Discharge
IEC 1000-4-2 Contact Discharge
Human Body Model
±15
±8
R_IN, T_OUT
kV
±15
AutoShutdown Plus (FORCEON = GND, FORCEOFF = V
)
CC
Positive threshold
Negative threshold
2.7
Receiver Input Threshold to
Figure 4a
V
V
INVALID Output High
-2.7
-0.3
Receiver Input Threshold to
Figure 4a
+0.3
0.4
INVALID Output Low
INVALID, READY
Output Voltage Low
(MAX3224E–MAX3227E)
I
I
= -1.6mA
V
V
OUT
OUT
INVALID, READY
Output Voltage Low
= -1.0mA
V
- 0.6
CC
(MAX3224E–MAX3227E)
Receiver Positive or Negative
Threshold to INVALID High
t
V
V
V
V
= 5V, Figure 4b
= 5V, Figure 4b
1
μs
μs
μs
s
INVH
CC
CC
CC
CC
Receiver Positive or Negative
Threshold to INVALID Low
t
30
INVL
Receiver or Transmitter Edge
to Transmitters Enabled
t
= 5V, Figure 5b (Note 2)
= 5V, Figure 5b (Note 2)
100
30
WU
Receiver or Transmitter Edge
to Transmitters Shutdown
t
15
60
AUTOSHDN
Maxim Integrated
│
7
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Timing Characteristics—MAX3224E/MAX3226E/MAX3244E
(V
= +3V to +5.5V, C1–C4 = 0.1μF, tested at 3.3V ±10%; C = 0.047μF, C2–C4 = 0.33μF, tested at 5.0V ±10%; T = T
to T
,
CC
1
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
R = 3kΩ, C = 1000pF,
MIN
TYP
MAX
UNITS
L
L
Maximum Data Rate
250
kbps
one transmitter switching
t
0.15
0.15
200
200
100
50
PHL
Receiver Propagation Delay
R_IN to R_OUT, C = 150pF
L
μs
t
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (MAX3244E only)
ns
ns
ns
ns
Normal operation (MAX3244E only)
│t
│t
- t
│ (Note 3)
PHL PLH
Receiver Skew
- t
│
PHL PLH
V
= 3.3V, T = +25°C,
A
CC
R = 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V, one
L
C = 150pF
to 1000pF
L
Transition-Region Slew Rate
6
30
V/μs
transmitter switching
Timing Characteristics—MAX3225E/MAX3227E/MAX3245E
(V
= +3V to +5.5V, C1–C4 = 0.1μF, tested at 3.3V ±10%; C = 0.047μF, C2–C4 = 0.33μF, tested at 5.0V ±10%; T = T
to T
,
CC
1
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
R = 3kΩ, C = 1000pF,
MIN
TYP
MAX
UNITS
L
L
250
one transmitter switching
V
= 3.0V to 4.5V, R = 3kΩ,
CC
L
Maximum Data Rate
1000
1000
kbps
C = 250pF, one transmitter switching
L
V
= 4.5V to 5.5V, R = 3kΩ,
L
CC
C = 1000pF, one transmitter switching
L
t
0.15
0.15
200
200
25
PHL
Receiver Propagation Delay
R_IN to R_OUT, C = 150pF
L
μs
t
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (MAX3245E only)
ns
ns
ns
ns
Normal operation (MAX3245E only)
│t
│t
- t
│ (Note 3)
PHL PLH
Receiver Skew
- t
│
50
PHL PLH
V
= 3.3V, T = +25°C,
A
CC
R = 3kΩ to 7kΩ, C = 150pF to 1000pF,
measured from +3V to -3V or -3V to +3V,
L
L
Transition-Region Slew Rate
24
150
V/μs
one transmitter switching
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3: Transmitter skew is measured at the transmitter zero cross points.
Maxim Integrated
│
8
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Typical Operating Characteristics
(V
= +3.3V, 250kbps data rate, 0.1μF capacitors, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L A
CC
MAX3224E/MAX3226E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224E/MAX3226E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224E/MAX3226E
SLEW RATE vs. LOAD CAPACITANCE
6
5
4
3
2
1
0
16
14
12
10
8
45
40
35
30
25
20
15
10
5
V
OUT+
250kbps
T1 TRANSMITTING AT 250kbps
-SLEW
120kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
+SLEW
-1
-2
-3
-4
-5
-6
20kbps
6
4
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
V
OUT-
2
FOR DATA RATES UP TO 250kbps
0
0
0
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225E/MAX3227E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3225E/MAX3227E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3225E/MAX3227E
SLEW RATE vs. LOAD CAPACITANCE
100
90
80
70
60
50
40
30
20
10
0
7.5
5.0
2.5
0
80
70
60
50
40
30
20
10
0
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225E)
2Mbps
LOAD = 3kΩ + C
L
1.5Mbps
-SLEW
+SLEW
1Mbps
2Mbps
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225E)
1.5Mbps
LOAD = 3kΩ + C
L
1.5Mbps
1Mbps
-2.5
-5.0
-7.5
2Mbps
1Mbps
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225E)
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225E/MAX3227E
TRANSMITTER SKEW
vs. LOAD CAPACITANCE
MAX3224E–MAX3227E
READY TURN-ON TIME
vs. TEMPERATURE
MAX3224E–MAX3227E
READY TURN-OFF TIME
vs. TEMPERATURE
50
45
40
35
30
25
20
15
10
5
38
200
180
160
140
120
100
80
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225E)
36
34
32
30
28
26
24
22
20
LOAD = 3kΩ + C
L
AVERAGE: 10 PARTS
60
40
20
0
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
Maxim Integrated
│ 9
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Typical Operating Characteristics (continued)
(V
= +3.3V, 250kbps data rate, 0.1μF capacitors, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L A
CC
MAX3244E
MAX3244E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3244E
SLEW RATE vs. LOAD CAPACITANCE
6
5
4
3
2
1
0
14
12
10
8
60
50
40
30
20
10
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
V
OUT+
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
250kbps
120kbps
6
-1
-2
-3
-4
-5
-6
20kbps
4
2
V
OUT-
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3245E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3245E
SLEW RATE vs. LOAD CAPACITANCE
7.5
5.0
2.5
0
70
60
50
40
30
20
10
0
2Mbps
1.5Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
2 TRANSMITTERS AT 1/16 DATA RATE
1.5Mbps
-2.5
-5.0
-7.5
1Mbps
2Mbps
1 TRANSMITTER AT 1Mbps
2 TRANSMITTERS AT 62.5kbps
0
400
800
1200
1600
2000
0
400
800
1200
1600
2000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3245E
MAX3245E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
TRANSMITTER SKEW
vs. LOAD CAPACITANCE
100
90
80
70
60
50
40
30
20
10
0
50
45
40
35
30
25
20
15
10
5
2Mbps
1.5Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
2 TRANSMITTERS AT 1/16 DATA RATE
0
0
400
800
1200
1600
2000
0
1000
2000
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
Maxim Integrated
│ 10
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Pin Description
PIN
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
SO/ SSOP/ TSSOP
NAME
FUNCTION
MAX3245E
TQFN
DIP/
SSOP/
TQFN
SSOP/
TQFN
TSSOP
TSSOP
Ready to Transmit Output,
active-high. READY is enabled
high when V- goes below
-4V and the device is ready
to transmit.
19
1
14
1
—
—
READY
Positive Terminal of
Voltage-Doubler Charge-Pump
Capacitor
1
20
2
2
3
4
16
15
1
2
3
4
28
27
24
31
30
26
C1+
V+
+5.5V generated by the charge
pump
Negative Terminal of
Voltage-Doubler Charge-Pump
Capacitor
C1-
Positive Terminal of Inverting
Charge-Pump Capacitor
3
4
5
5
6
7
2
3
4
5
6
7
1
2
3
33
34
35
C2+
C2-
V-
Negative Terminal of Inverting
Charge-Pump Capacitor
-5.5V Generated by the Charge
Pump
6, 15
7, 14
8, 17
9, 16
10
5
13
8
9, 10, 11
4-8
7, 8, 9
1-5
T_OUT
RS-232 Transmitter Outputs
R_IN
RS-232 Receiver Inputs
15, 16, 17,
19, 20
8, 13
10, 15
6
9
15-19
R_OUT
TTL/CMOS Receiver Outputs
Valid Signal Detector Output,
active low. A logic high indicates
that a valid RS-232 level is
present on a receiver input.
9
11
7
8
10
11
21
23
INVALID
10, 11
12, 13
12-14
11, 12, 13
T_IN
TTL/CMOS Transmitter Inputs
Force-On Input, Active-
High. Drive high to override
AutoShutdown Plus, keeping
transmitters and receivers on
(FORCEOFF must be high)
(Table 1).
12
14
9
12
23
25
FORCEON
Maxim Integrated
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Pin Description (continued)
PIN
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
SO/ SSOP/ TSSOP
NAME
FUNCTION
MAX3245E
TQFN
DIP/
SSOP/
TQFN
SSOP/
TQFN
TSSOP
TSSOP
16
17
18
19
11
12
14
25
26
27
29
GND
Ground
+3.0V to +5.5V Single Supply
Voltage
15
V
CC
Force-Off Input, Active-Low.
MAX3225E, MAX3227E:
When Force-Off input is
low, transmitters are in high
impedance, charge pumps are
shutdown, and receivers are
active.
18
20
13
16
22
24
FORCEOFF MAX3244E, MAX3245E:
When Force-Off input is low,
transmitters and receivers are
in high impedance, charge
pumps are shutdown, and only
R2OUTB is active. Force-Off
overrides AutoShutdown Plus
and FORCEON (Table 1).
TTL/CMOS Noninverting
—
—
—
—
—
—
—
—
—
—
—
—
20
—
—
21
R2OUTB
N.C.
Complementary Receiver
Outputs. Always active.
6, 10, 14, 18,
22, 28, 32, 36
No Connection. Not internally
connected.
Exposed Pad. Solder the
exposed pad to the ground
plane or leave unconnected.
—
EP
5.5V, the charge pump is enabled; if the output voltages
exceed 5.5V, the charge-pump is disabled. Each charge
pump requires a flying capacitor (C1, C2) and a reservoir
capacitor (C3, C4) to generate the V+ and V- supplies.
Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3224E–MAX3227E/MAX3244E/MAX3245E’s
internal power supply consists of a regulated dual charge
pump that provides output voltages of +5.5V (doubling
charge pump) and -5.5V (inverting charge pump), over
the +3.0V to +5.5V range. The charge pump operates in
discontinuous mode: if the output voltages are less than
The READY output (MAX3224E–MAX3227E) is low when
the charge pumps are disabled in shutdown mode. The
READY signal asserts high when V- goes below -4V.
Maxim Integrated
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
V
CC
MAX3244E
MAX3245E
PROTECTION
DIODE
PREVIOUS
RS-232
V
CC
I
Rx
Tx
5kΩ
UART
I/O
CHIP
WITH
UART
CPU
GND
SHDN = GND
RS-232
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
µP
LOGIC
TRANSITION
DETECTOR
Figure 1. Interface Under Control of PMU
MAX3244E
MAX3245E
I
PROTECTION
DIODE
RS-232 Transmitters
R2OUTB
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The
MAX3224E/MAX3226E/MAX3244E guarantee a 250kbps
data rate (1Mbps, for the MAX3225E/MAX3227E/
MAX3245E) with worst-case loads of 3kΩ in parallel with
1000pF, providing compatibility with PC-to-PC communi-
V
CC
R2IN
Rx
R2OUT
THREE-STATED
UART
5kΩ
T1OUT
®
cation software (such as LapLink ). Transmitters can be
T1IN
Tx
paralleled to drive multiple receivers. Figure 1 shows a
GND
complete system connection.
FORCEOFF = GND
When FORCEOFF is driven to ground or when the Auto-
Shutdown Plus circuitry senses that all receiver and
transmitter inputs are inactive for more than 30s, the
transmitters are disabled and the outputs go into a high-
impedance state. When powered off or shut down, the
outputs can be driven to ±12V. The transmitter inputs do
not have pullup resistors. Connect unused inputs to GND
b) NEW MAX3244E/MAX3245E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR
EXTERNAL DEVICES AND R2OUT IS THREE STATED, ELIMINATING A
CURRENT PATH THROUGH THE UART'S PROTECTION DIODE.
or VCC
.
Figure 2. The MAX3244E/MAX3245E detect RS-232 activity
when the UART and interface are shut down.
LapLink is a registered trademark of Laplink Software, Inc.
Maxim Integrated
│ 13
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Table 1. Output Control Truth Table
R_OUT
(MAX3224E/
RECEIVER OR
TRANSMITTER
EDGE WITHIN
30s
VALID
R_OUT
R2OUTB
OPERATION
STATUS
FORCEON FORCEOFF RECEIVER
T_OUT MAX3225E/ (MAX3244E/ (MAX3244E/
LEVEL
MAX3226E/
MAX3227E)
MAX3245E)
MAX3245E)
Shutdown
(Forced Off)
X
1
0
1
X
X
X
X
High-Z
Active
Active
Active
High-Z
Active
Active
Active
Normal
Operation
(Forced On)
Normal
Operation
(AutoShutdown
Plus)
0
1
X
Yes
Active
Active
Active
Active
Shutdown (Auto-
Shutdown Plus)
0
1
1
X
No
X
High-Z
Active
Active
Active
Active
Active
Active
Active
Normal
Operation
INVALID*
Yes
Normal
Operation
INVALID*
1
1
X
Yes
No
Active
Active
Active
Active
Active
Active
Active
Shutdown
INVALID*
No
High-Z
Normal
Operation
(AutoShutdown)
INVALID*
INVALID*
INVALID**
INVALID**
Yes
No
X
X
Active
Active
Active
Active
Active
Active
Shutdown
(AutoShutdown)
High-Z
High-Z
X = Don’t care
* INVALID connected to FORCEON
** INVALID connected to FORCEON and FORCEOFF
The MAX3224E–MAX3227E/MAX3244E/MAX3245E
feature an INVALID output that is enabled low when no
valid RS-232 voltage levels have been detected on all
receiver inputs. Because INVALID indicates the receiver
input’s condition, it is independent of FORCEON and
FORCEOFF states (Figures 3 and 4).
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3224E–MAX3227E feature
inverting outputs that always remain active (Table 1). The
MAX3244E/MAX3245E have inverting three-state outputs
that are high impedance when shut down (FORCEOFF =
GND) (Table 1).
AutoShutdown Plus Mode
The MAX3244E/MAX3245E feature an extra, always
active, noninverting output, R2OUTB. R2OUTB output
monitors receiver activity while the other receivers are
high impedance, allowing ring indicator applications
to be monitored without forward biasing other devices
connected to the receiver outputs. This is ideal for
The MAX3224E–MAX3227E/MAX3244E/MAX3245E
achieve a 1μA supply current with Maxim’s AutoShutdown
Plus feature, which operates when FORCEOFF is high
and a FORCEON is low. When these devices do not
sense a valid signal transition on any receiver and trans-
mitter input for 30s, the on-board charge pumps are
shut down, reducing supply current to 1μA. This occurs
if the RS-232 cable is disconnected or if the connected
systems where V
is set to ground in shutdown to
CC
accommodate peripherals such as UARTs (Figure 2).
Maxim Integrated
│ 14
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
EDGE
T_IN
+0.3V
R_IN
FORCEOFF
DETECT
S
30s
AUTOSHDN
30µs
INVALID
TIMER
R
TIMER
EDGE
DETECT
R_IN
R
-0.3V
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST 30µs.
FORCEON
Figure 3a. INVALID Functional Diagram, INVALID Low
Figure 3c. AutoShutdown Plus Logic
+2.7V
FORCEOFF
POWERDOWN*
FORCEON
R_IN
30µs
TIMER
R
AUTOSHDN
INVALID
-2.7V
* POWERDOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V
FOR LESS THAN 30µs.
Figure 3b. INVALID Functional Diagram, INVALID High
Figure 3d. Power-Down Logic
When shut down, the device’s charge pumps turn off, V+
Table 2. INVALID Truth Table
is pulled to V , V- is pulled to ground, the transmitter
CC
RS-232 SIGNAL
outputs are high impedance, and READY (MAX3224E–
MAX3227E) is driven low. The time required to exit shut-
down is typically 100μs (Figure 8).
PRESENT AT ANY
RECEIVER INPUT
INVALID OUTPUT
Yes
No
High
By connecting FORCEON to INVALID, the MAX3224E–
MAX3227E/MAX3244E/MAX3245E shut down when no
valid receiver level and no receiver or transmitter edge is
detected for 30s, and wake up when a valid receiver level
or receiver or transmitter edge is detected.
Low
peripheral transmitters are turned off, and the UART
driving the transmitter inputs is inactive. The system turns
on again when a valid transition is applied to any RS-232
receiver or transmitter input. As a result, the system saves
power without changes to the existing BIOS or operating
system.
INVALID HIGH
+2.7V
INDETERMINATE
Figures 3a and 3b depict valid and invalid RS-232
receiver voltage levels. INVALID indicates the receiver
input’s condition, and is independent of FORCEON and
FORCEOFF states. Figure 3 and Tables 1 and 2 summa-
rize the operating modes of the MAX3224E–MAX3227E/
MAX3244E/MAX3245E. FORCEON and FORCEOFF
override AutoShutdown Plus circuitry. When neither
control is asserted, the IC selects between these states
automatically based on the last receiver or transmitter
input edge received.
+0.3V
0
INVALID LOW
INDETERMINATE
INVALID HIGH
-0.3V
-2.7V
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
RECEIVER
INPUTS
INVALID
REGION
}
TRANSMITTER
INPUTS
TRANSMITTER
OUTPUTS
V
INVALID
OUTPUT
CC
t
INVL
t
INVH
t
0
AUTOSHDN
t
AUTOSHDN
t
t
WU
WU
*V
CC
READY
0
V+
V
CC
0
V-
*MAX3224E–MAX3227E
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut
down when no valid receiver level is detected and wake
up when a valid receiver level is detected (same function-
ality as AutoShutdown feature on MAX3221E/MAX3223E/
MAX3243E).
discharges encountered during handling and assembly.
The driver outputs and receiver inputs of the MAX3224E–
MAX3227E/MAX3244E/MAX3245E have extra pro-
tection against static electricity. Maxim’s engineers
have developed state-of-the-art structures to protect
A mouse or other system with AutoShutdown Plus may
need time to wake up. Figure 5 shows a circuit that
forces the transmitters on for 100ms, allowing enough
time for the other system to realize that the MAX3244E/
MAX3245E is awake. If the other system outputs valid
RS-232 signal transitions within that time, the RS-232
ports on both systems remain enabled.
POWER-
MASTER SHDN LINE
MANAGEMENT
UNIT
0.1µF
1MΩ
FORCEOFF FORCEON
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
Software-Controlled Shutdown
If direct software control is desired, use INVALID to indi-
cate DTR or ring indicator signal. Tie FORCEOFF and
FORCEON together to bypass the AutoShutdown Plus so
the line acts like a SHDN input.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
Maxim Integrated
│ 16
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
R
C
50MΩ to 100MΩ
R 330Ω
D
R
C
1MΩ
R 1500Ω
D
DISCHARGE
RESISTANCE
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
CHARGE CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
DEVICE
UNDER
TEST
C
s
100pF
STORAGE
CAPACITOR
C
s
150pF
STORAGE
CAPACITOR
SOURCE
SOURCE
Figure 6a. Human Body ESD Test Model
Figure 7a. IEC 1000-4-2 ESD Test Model
I
I
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
P
100%
90%
r
AMPERES
36.8%
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
10%
Figure 6b. Human Body Current Waveform
t
t = 0.7ns to 1ns
r
30ns
these pins against ESD of ±15kV without damage. The
ESD structures withstand high ESD in all states: normal
operation, shutdown, and powered down. After an ESD
event, Maxim’s E versions keep working without latchup,
whereas competing RS-232 products can latch and must
be powered down to remove latchup.
60ns
Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform
ESD Test Conditions
ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model
1) ±15kV using the Human Body Model
Figure 6a shows the Human Body Model and Figure
6b shows the current waveform it generates when
discharged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
2) ±8kV using the Contact-Discharge Method specified
in IEC 1000-4-2
3) ±15kV using IEC 1000-4-2’s Air-Gap Method.
Maxim Integrated
│ 17
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
IEC 1000-4-2
5V/div
FORCEON = FORCEOFF
T1OUT
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3224E–MAX3227E,
MAX3244E/MAX3245E help you design equipment that
meets Level 4 (the highest level) of IEC 1000-4-2, without
the need for additional ESD-protection components.
0
2V/div
0
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2, because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body Model.
Figure 7a shows the IEC 1000-4-2 model and Figure 7b
shows the current waveform for the 8kV, IEC 1000-4-2,
Level 4, ESD Contact-Discharge Method.
V
= 3.3V
T2OUT
READY
CC
5V/div
0
C1–C4 = 0.1µF
5µs/div
Figure 8. Transmitter Outputs when Exiting Shutdown or
Powering Up
can be used. The charge pump requires 0.1μF capaci-
tors for 3.3V operation. For other supply voltages,
see Table 3 for required capacitor values. Do not use
values smaller than those listed in Table 3. Increasing
the capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4, and
The Air-Gap Method involves approaching the device
with a charged probe. The Contact-Discharge Method
connects the probe to the device before the probe is
energized.
Machine Model
The Machine Model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. Its
objective is to emulate the stress caused by contact that
occurs with handling and assembly during manufacturing.
Of course, all pins require this protection during manu-
facturing, not just RS-232 inputs and outputs. Therefore,
after PC board assembly, the Machine Model is less
relevant to I/O ports.
C
, to maintain the proper ratios (C1 to the other
BYPASS
capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade exces-
sively with temperature. If in doubt, use capacitors with
a larger nominal value. The capacitor’s equivalent series
resistance (ESR), which usually rises at low tempera-
tures, influences the amount of ripple on V+ and V-.
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
Power-Supply Decoupling
In most circumstances, a 0.1μF V
bypass capacitor
CC
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as
charge-pump capacitor C1. Connect bypass capacitors
as close to the IC as possible.
Table 3. Required Minimum Capacitance
Values
V
C1, C
C2, C3, C4
CC
BYPASS
Transmitter Outputs
when Exiting Shutdown
Figure 8 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two transmit-
ter outputs are shown going to opposite RS-232 levels
(one transmitter input is high, the other is low). Each
(V)
(μF)
0.22
0.1
(μF)
3.0 to 3.6
3.15 to 3.6
4.5 to 5.5
3.0 to 5.5
0.22
0.1
0.33
1
0.047
0.22
Maxim Integrated
│ 18
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
transmitter is loaded with 3kΩ in parallel with 1000pF.
The transmitter outputs display no ringing or undesirable
transients as they come out of shutdown. Note that the
transmitters are enabled only when the magnitude of
V- exceeds approximately -3V.
5V/div
5V/div
5V/div
T1IN
High Data Rates
The MAX3224E/MAX3226E/MAX3244E maintain the
RS-232 ±5.0V minimum transmitter output voltage even
at high data rates. Figure 9 shows a transmitter loop-
back test circuit. Figure 10 shows a loop-back test result at
120kbps, and Figure 11 shows the same test at 250kbps.
For Figure 10, all transmitters were driven simultaneously
at 120kbps into RS-232 loads in parallel with 1000pF. For
Figure 11, a single transmitter was driven at 250kbps, and
all transmitters were loaded with an RS-232 receiver in
parallel with 250pF.
T1OUT
R1OUT
V
CC
= 3.3V
2µs/div
Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 120kbps
The MAX3225E/MAX3227E/MAX3245E maintain the
RS-232 ±5.0V minimum transmitter output voltage at data
rates up to 1Mbps (MegaBaud). Figure 12 shows a loop-
back test result with a single transmitter driven at 1Mbps
and all transmitters loaded with an RS-232 receiver in
parallel with 250pF.
5V/div
5V/div
5V/div
T1IN
T1OUT
R1OUT
V
CC
C
BYPASS
V
CC
= 3.3V
V
CC
C1+
V+
V-
2µs/div
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
C3*
C4
C1
C2
C1-
Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 250kbps
C2+
C2-
T_ OUT
T_ IN
5V/div
5V/div
5V/div
T1IN
R_ IN
R_ OUT
T1OUT
5kΩ
1000pF
FORCEON
V
CC
FORCEOFF
GND
R1OUT
V
CC
= 3.3V
*C3 CAN BE RETURNED TO V OR GND.
CC
200ns/div
Figure 9. Loopback Test Circuit
Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test
Result at 1Mbps
Maxim Integrated
│ 19
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
+3.3V
0.1µF
26
V
CC
27
3
28
C1+
V+
C1
0.1µF
C3
0.1µF
24
C1-
COMPUTER SERIAL PORT
MAX3244E
MAX3245E
1
2
C2+
V-
C4
C2
0.1µF
0.1µF
C2-
+V
+V
-V
T1IN
T1OUT
9
14
T2IN
T3IN
LOGIC
INPUTS
T2OUT 10
13
12
11
T3OUT
GND
Tx
R2OUTB
20
R1OUT
R2OUT
R3OUT
R1IN
5kΩ
R2IN
4
5
19
18
17
LOGIC
OUTPUTS
5kΩ
R3IN
5kΩ
6
7
8
RS-232
INPUTS
R4OUT
R5OUT
16
R4IN
5kΩ
5kΩ
SERIAL
MOUSE
15
23
R5IN
FORCEON
FORCEOFF
INVALID
22
21
V
CC
TO POWER-
MANAGEMENT
UNIT
GND
25
Figure 13a. Mouse Driver Test Circuit
Maxim Integrated
│ 20
www.maximintegrated.com
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Mouse Driveability
The MAX3244E/MAX3245E are specifically designed
to power serial mice while operating from low-voltage
power supplies. They have been tested with leading
mouse brands from manufacturers such as Microsoft and
Logitech. The MAX3244E/MAX3245E successfully drove
all serial mice tested and met their respective current and
voltage requirements. The MAX3244E/MAX3245E dual
charge pump ensures the transmitters supply at least
±5V during worst-case conditions. Figure 13b shows the
transmitter output voltages under increasing load current.
Figure 13a shows a typical mouse connection.
6
5
4
V
OUT+
V
= 3.0V
CC
3
2
V
V
1
OUT+
0
-1
-2
-3
-4
-5
-6
V
CC
OUT-
V
OUT-
Interconnection with 3V and 5V Logic
The MAX3224E–MAX3227E/MAX3244E/MAX3245E can
directly interface with various 5V logic families, including
ACT and HCT CMOS. See Table 4 for more information
on possible combinations of interconnections.
0
1
2
3
4
5
6
7
8
9
10
LOAD CURRENT PER TRANSMITTER (mA)
Figure 13b. MAX324_E Transmitter Output Voltage vs. Load
Current per Transmitter
Table 5 lists other Maxim ESD-powered transceivers.
Table 4. Logic Family Compatibility with Various Supply Voltages
SYSTEM
V
SUPPLY
CC
POWER-SUPPLY
VOLTAGE (V
VOLTAGE
COMPATIBILITY
(V)
3.3
5
3.3
5
Compatible with all CMOS families
Compatible with all TTL and CMOS families
5
3.3
Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS
Table 5. ±15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim
SUPPLY
VOLTAGE
RANGE
(V)
Human IEC 1000-4-2 IEC 1000-4-2
NO.
OF
Tx/Rx
SUPPLY
CURRENT Shutdown
Auto-
GUARANTEED
DATA RATE
(kbps)
Auto-
Body
Contact
Discharge
(kV)
Air-Gap
Discharge
(kV)
PART
Shutdown Model
(kV)
(μA)
Plus
MAX3241E
MAX3243E
MAX3244E
MAX3245E
MAX3232E
MAX3222E
MAX3223E
MAX3224E
MAX3225E
MAX3221E
MAX3226E
MAX3227E
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
3/5
3/5
3/5
3/5
2/2
2/2
2/2
2/2
2/2
1/1
1/1
1/1
300
1
—
—
—
Yes
—
±15
±15
±15
±15
±15
±15
±15
±15
±15
±15
±15
±15
±8
±8
±8
±8
±8
±8
±8
±8
±8
±8
±8
±8
±15
±15
±15
±15
±15
±15
±15
±15
±15
±15
±15
±15
250
250
1
Yes
Yes
—
250
1
—
1Mbps
250
300
300
1
—
—
—
250
—
Yes
—
250
1
Yes
Yes
—
250
1
—
1Mbps
250
1
Yes
—
1
Yes
Yes
250
1
—
1Mbps
Maxim Integrated
│ 21
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Typical Operating Circuits
+3.3V
26
+3.3V
15
C
BYPASS
0.1µF
0.1µF
2
C
BYPASS
V
V
CC
CC
3
7
27
3
28
C1+
C1+
V+
V-
V+
C1
0.1µF
C1
0.1µF
C3
0.1µF
C3
0.1µF
4
5
6
24
1
C1-
C1-
MAX3226E*
MAX3227E
C2+
MAX3244E***
MAX3245E
C2+
V-
C4
0.1µF
C2
0.1µF
C2
0.1µF
C4
2
0.1µF
C2-
C2-
T1IN
11
9
T1IN
T1OUT 13
T1OUT
9
14
T2IN
T3IN
T2OUT 10
13
12
R1OUT
R1IN
5kΩ
8
11
21
T3OUT
FORCEOFF
FORCEON
22
23
TO POWER-
MANAGEMENT
UNIT
READY
INVALID 10
1
INVALID
AutoShutdown
Plus
AutoShutdown
Plus
FORCEOFF
FORCEON
16
12
V
CC
R2OUTB
R1OUT
20
19
GND
14
R1IN
R2IN
4
5
+3.3V
19
C
0.1µF
2
BYPASS
R2OUT
R3OUT
R4OUT
V
18
17
16
CC
3
7
C1+
V+
V-
C1
C3
0.1µF
4
5
6
0.1µF
C1-
MAX3224E**
MAX3225E
6
7
R3IN
R4IN
C2+
C4
0.1µF
C2
0.1µF
C2-
13
T1IN
T1OUT 17
TTL/CMOS
INPUTS
RS-232
OUTPUTS
8
T2IN
T2OUT
12
R5OUT
15
R5IN
8
GND
25
16
15 R1OUT
R1IN
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
R2IN
10 R2OUT
9
5kΩ
TO POWER-
MANAGEMENT
UNIT
AutoShutdown
Plus
READY
INVALID 11
1
*MAX3226E/MAX3227E PIN OUT REFERS TO SSOP/TSSOP PACKAGES.
**MAX3224E/MAX3225E PIN OUT REFERS TO DIP/ SSOP/TSSOP PACKAGES.
***MAX3244E/MAX3245E PIN OUT REFERS TO SO/SSOP/TSSOP PACKAGES.
FORCEOFF
FORCEON
20
14
V
CC
GND
18
Maxim Integrated
│ 22
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Pin Configurations
+
+
+
READY
C1+
V+
FORCEOFF
READY
16 FORCEOFF
1
2
3
4
5
6
7
8
1
2
C2+
C2-
20
19
18
17
16
15
14
13
12
11
C1+
V+
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
15
14
V
CC
C1+
V+
V
CC
GND
GND
3
V-
V
3
CC
MAX3226E
MAX3227E
C1-
T1OUT
R1IN
C1-
C2+
C2-
V-
13 T1OUT
4
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T2OUT
T3OUT
T3IN
GND
MAX3224E
MAX3225E
4
MAX3244E
MAX3245E
C2+
C2-
FORCEON
5
C1-
12
5
R1OUT
FORCEON
T1IN
11 T1IN
10 INVALID
6
FORCEON
FORCEOFF
INVALID
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
6
V-
7
7
T2OUT
9
R1IN
R1OUT
8
8
R2IN
T2IN
9
9
SSOP/TSSOP
R2OUT
INVALID
10
10
11
12
13
14
DIP/SSOP/TSSOP
TOP VIEW
T2IN
15
14
13
12
11
T1IN
SO/SSOP/TSSOP
T2IN
10
GND 16
17
INVALID
9
8
7
6
V
CC
MAX3224E
MAX3225E
FORCEOFF 18
READY 19
R2OUT
R2IN
TOP VIEW
36 35 34 33 32 31 30 29 28
*EP
+
20
T2OUT
V+
R1IN
R2IN
1
2
3
4
5
6
7
8
9
27 GND
+
26 C1-
1
2
3
4
5
R3IN
25 FORCEON
24 FORCEOFF
23 INVALID
22 N.C.
R4IN
MAX3245E
R5IN
TQFN
N.C.
T1OUT
T2OUT
T3OUT
21 R2OUTB
TOP VIEW
R1OUT
20
*EP
19 R2OUT
12
11
10
9
10 11 12 13 14 15 16 17 18
T1IN
8
7
6
5
13
FORCEOFF
MAX3226E
MAX3227E
READY 14
INVALID
R1OUT
R1IN
TQFN
V+
15
16
C1+
*EP
4
+
1
2
3
*CONNECT EP TO GND.
TQFN
Maxim Integrated
│ 23
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Ordering Information (continued)
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
20 TQFN-EP*
20 SSOP
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
0°C to +70°C
PIN-PACKAGE
16 TQFN-EP*
16 TSSOP
16 SSOP
MAX3225ECUP+
MAX3225ECTP+
MAX3225ECAP+
MAX3225ECPP+
MAX3225EETP+
MAX3225EEUP+
MAX3225EEUP/V+
MAX3225EEAP+
MAX3225EEPP+
MAX3225EAAP+
MAX3226ECTE+
MAX3226ECUE+
MAX3226ECAE+
MAX3226EEAE+
MAX3226EETE+
MAX3226EEUE+
MAX3226EAAE+
MAX3227ECAE+
MAX3227ECTE+
MAX3227ECUE+
MAX3227EEAE+
MAX3227EEAE/V+
MAX3227EETE+
MAX3227EEUE+
MAX3227EAAE+
MAX3244ECWI+
MAX3244ECAI+
MAX3244ECUI+
MAX3244EEWI+
MAX3244EEAI+
MAX3244EEUI+
MAX3245ECWI+
MAX3245ECAI+
MAX3245ECTX+
MAX3245EEAI+
MAX3245EEWI+
MAX3245EEUI+
MAX3245EETX+
20 Plastic DIP
20 TQFN -EP*
20 TSSOP
20 TSSOP
20 SSOP
28 Wide SO
28 SSOP
0°C to +70°C
0°C to +70°C
28 TSSOP
28 Wide SO
28 SSOP
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
20 Plastic DIP
20 SSOP
28 TSSOP
28 Wide SO
28 SSOP
16 TQFN-EP*
16 TSSOP
16 SSOP
0°C to +70°C
0°C to +70°C
36 TQFN- EP*
28 SSOP
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
16 SSOP
28 WIDE SO
28 TSSOP
36 TQFN- EP*
16 TQFN-EP*
16 TSSOP
16 SSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
16 SSOP
16 TQFN-EP*
16 TSSOP
16 SSOP
Chip Information
PROCESS: BiCMOS
16 SSOP
Maxim Integrated
│ 24
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±15kV ESD-Protected, 1μA, 1Mbps,
3.0V to 5.5V, RS-232 Transceivers
with AutoShutdown Plus
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
Added an automotive qualified part to the Ordering Information; changed all
the parts listed in the Ordering Information to lead free
10
11
3/11
1, 20
Updated Applications, Absolute Maximum Ratings, Package Information,
Electrical Characteristics, Pin Description, and Ordering Information
11/18
1–5, 12, 24
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2018 Maxim Integrated Products, Inc.
│ 25
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