MAX3224EETP-T [MAXIM]
Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, BICMOS, PQCC20, 5 X 5 MM, 0.75 MM HEIGHT, MO-220WHHC, TQFN-20;
| 型号： | MAX3224EETP-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, BICMOS, PQCC20, 5 X 5 MM, 0.75 MM HEIGHT, MO-220WHHC, TQFN-20 驱动 信息通信管理 接口集成电路 驱动器 |
| 文件： | 总21页 (文件大小：952K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/
MAX3244E/MAX3245E
±±15k ꢀEDꢁ-rotected, ±µA, ±Mbps, 3.0k to 1.1k,
REꢁ232 Transceivers with AutoEhutdown -lus
________________General Description
__Next Generation Device Features
The MAX3224E/MAX3225E/MAX3226E/MAX3227E/
MAX3244E/MAX3245E are 3V-powered EIA/TIA-232
and V.28/V.24 communications interfaces with automat-
ic shutdown/wakeup features, high data-rate capabili-
ties, and enhanced electrostatic discharge (ESD)
protection. All transmitter outputs and receiver inputs
are protected to ±±5kV using IEꢀ ±111-4-2 Air-ꢁap
Discharge, ±8kV using IEꢀ ±111-4-2 ꢀontact Discharge,
and ±±5kV using the ꢂuman ꢃodꢄ Model.
♦ For Space-Constrained Applications:
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 ±µA supplꢄ current using Maxim’s
revolutionarꢄ AutoShutdown Plus™ feature. These
devices automaticallꢄ 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 31 seconds. Theꢄ turn on again when
theꢄ sense a valid transition at anꢄ transmitter or receiv-
er input. AutoShutdown Plus saves power without
changes to the existing ꢃIOS or operating sꢄstem.
Ordering Information
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
PIN-PACKAGE
20 TQFN-EP*
20 TSSOP
MAX3224ECTP+
MAX3224ECUP+
MAX3224ECAP+
MAX3224ECPP+
MAX3224EETP+
MAX3224EEUP+
MAX3224EEAP+
MAX3224EEPP+
MAX3224EAAP+
The MAX3225E/MAX3227E/MAX3245E also feature
Megaꢃaud™ operation, guaranteeing ±Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224E/MAX3226E/MAX3244E guar-
antee 251kbps operation. The transceivers have a pro-
prietarꢄ low-dropout transmitter output stage enabling
true RS-232 performance from a +3.1V to +5.5V supplꢄ
with a dual charge pump. The charge pump requires
onlꢄ four small 1.±µF capacitors for operation from a
3.3V supplꢄ. The MAX3224E–MAX3227E feature a logic-
level output (READY) that asserts when the charge
pump is regulating and the device is readꢄ to begin
transmitting.
20 SSOP
20 Plastic DIP
20 TQFN-EP*
20 TSSOP
20 SSOP
20 Plastic DIP
-40°C to +125°C 20 SSOP
+Denotes a lead(Pb)-free/RoꢂS-compliant package.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
All devices are available in a space-saving TQFN,
SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/
MAX3245E) packages.
_____________________ Eelector Guide
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
Auto-
Shutdown
Plus
READY
OUTPUT
PART
________________________Applications
Notebook, Subnotebook, and Palmtop ꢀomputers
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
2/2
2/2
±/±
±/±
3/5
3/5
251k
±M
ꢀellular Phones
ꢃatterꢄ-Powered Equipment
ꢂand-ꢂeld Equipment
Peripherals
251k
±M
251k
±M
—
—
Printers
AutoShutdowlus, Megaꢃaud, and UꢀSP are trademarks of
Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
±9-±339; Rev ±1; 3/±±
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±Mbps,V3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
ABSOLUTE MAXIMUM RATINGS
CC
V
to GND..............................................................-0.3V to +6V
20-Pin ꢁQFN (derate 21.3mW/°C above +70°C) ....1702.1mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
20-Pin ꢁSSOP (derate 10.9mW/°C above +70°C) .......879mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C)............1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
28-Pin ꢁSSOP (derate 12.8mW/°C above +70°C) .......1026mW
36-Pin ꢁQFN (derate 26.3mW/°C above +70°C)...........2105mW
Operating ꢁemperature Ranges
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
ꢁ_IN, FORCEON, FORCEOFF to GND................ -0.3V to +6V
R_IN to GND .................................................................... 25V
Output Voltages
ꢁ_OUꢁ to GND............................................................. 13.2V
R_OUꢁ, INVALID, READY to GND .........-0.3V to (V
Short-Circuit Duration
ꢁ_OUꢁ to GND .......................................................Continuous
+ 0.3V)
MAX32_ _EC_ _ .................................................0°C to +70°C
MAX32_ _EE_ _................................................-40°C to +85°C
MAX32_ _EAA_..............................................-40°C to +125°C
Storage ꢁemperature Range.............................-65°C to +160°C
Lead ꢁemperature (soldering, 10s) .................................+300°C
Soldering ꢁemperature (reflow) .......................................+260°C
CC
Continuous Power Dissipation (ꢁ = +70°C)
A
16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW
16-Pin ꢁSSOP (derate 9.4mW/°C above +70°C) ......754.7mW
16-Pin ꢁQFN (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. ꢁhese 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.
ELECTRICAL CHARACTERISTICS
CC
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ% C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ% ꢁ = ꢁ
to ꢁ
,
MAX
1
A
MIN
unless otherwise noted. ꢁypical values are at ꢁ = +25°C.)
A
PARAMETER
SYMBOL
= 3.3V or 5.0V, ꢁ = +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 ꢁ_IN idle
,
CC
1
1
10
10
1
µA
µA
Supply Current, Shutdown
Supply Current,
AutoShutdown Plus Disabled
FORCEOFF = GND
0.3
mA
FORCEON = FORCEOFF = V , no load
CC
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic ꢁhreshold Low
0.8
V
V
ꢁ_IN, FORCEON, FORCEOFF
V
CC
CC
= 3.3V
= 5.0V
2
ꢁ_IN, FORCEON,
Input Logic ꢁhreshold High
FORCEOFF
V
2.4
ꢁransmitter Input Hysteresis
Input Leakage Current
0.5
V
0.01
1
10
µA
ꢁ_IN, FORCEON, FORCEOFF
R_OUꢁ (MAX3244E/MAX3245E), receivers
disabled
Output Leakage Current
0.05
µA
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
I
I
= 1.6mA
= -1.0mA
0.4
V
V
OUꢁ
V
CC
- 0.6 V
- 0.1
OUꢁ
CC
-25
0.6
0.8
+25
V
V
V
CC
V
CC
V
CC
V
CC
= 3.3V
= 5.0V
= 3.3V
= 5.0V
1.2
Input ꢁhreshold Low
Input ꢁhreshold High
ꢁ
ꢁ
= +25°C
= +25°C
A
1.5
1.5
1.8
0.5
5
2.4
2.4
V
A
Input Hysteresis
Input Resistance
V
ꢁ
= +25°C
3
7
kΩ
A
2
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±Mbps,V3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
ELECTRICAL CHARACTERISTICS (continued)
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ% C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ% ꢁ = ꢁ
to ꢁ
,
MAX
CC
1
A
MIN
unless otherwise noted. ꢁypical values are at ꢁ = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TRANSMITTER OUTPUTS
All transmitter outputs loaded with 3kΩ to
ground
Output Voltage Swing
5
5.4
V
Output Resistance
V
CC
= V+ = V- = 0V, transmitter outputs = 2V
300
10M
Ω
Output Short-Circuit Current
60
25
mA
V
= 0V or 3V to 5.5V, V
= 12V,
CC
OUꢁ
Output Leakage Current
µA
ꢁransmitters disabled
MOUSE DRIVEABILITY (MAX3244E/MAX3245E)
ꢁ1IN = ꢁ2IN = GND, ꢁ3IN = V
,
CC
ꢁ3OUꢁ loaded with 3kΩ to GND,
ꢁ1OUꢁ and ꢁ2OUꢁ loaded with
2.5mA each
ꢁransmitter Output Voltage
ESD PROTECTION
R_IN, ꢁ_OUꢁ
5
V
IEC 1000-4-2 Air Discharge
IEC 1000-4-2 Contact Discharge
Human Body Model
15
8
kV
15
AutoShutdown Plus (FORCEON = GND, FORCEOFF = V
)
CC
Positive threshold
Negative threshold
2.7
Receiver Input ꢁhreshold to
Figure 4a
V
V
INVALID Output High
-2.7
-0.3
Receiver Input ꢁhreshold to
Figure 4a
+0.3
0.4
INVALID Output Low
INVALID, READY
Output Voltage Low
(MAX3224E–MAX3227E)
I
= -1.6mA
= -1.0mA
V
V
OUꢁ
OUꢁ
INVALID, READY
Output Voltage High
(MAX3224E–MAX3227E)
I
V
- 0.6
CC
Receiver Positive or Negative
ꢁhreshold to INVALID High
t
V
CC
V
CC
V
CC
V
CC
= 5V, Figure 4b
= 5V, Figure 4b
1
µs
µs
µs
s
INVH
Receiver Positive or Negative
ꢁhreshold to INVALID Low
t
30
INVL
Receiver or ꢁransmitter Edge to
ꢁransmitters Enabled
t
= 5V, Figure 5b (Note 2)
= 5V, Figure 5b (Note 2)
100
30
WU
Receiver or ꢁransmitter Edge to
ꢁransmitters Shutdown
tAUꢁOSHDN
15
60
Maxim Integrated
3
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±Mbps,V3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
TIMING CHARACTERISTICS—MAX3224E/MAX3226E/MAX3244E
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ% C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ% ꢁ = ꢁ
to ꢁ
,
MAX
CC
1
A
MIN
unless otherwise noted. ꢁypical values are at ꢁ = +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
t
0.15
0.15
200
200
100
50
PHL
Receiver Propagation Delay
R_IN to R_OUꢁ, C = 150pF
L
µs
PLH
Receiver Output Enable ꢁime
Receiver Output Disable ꢁime
ꢁransmitter Skew
Normal operation (MAX3244E only)
Normal operation (MAX3244E only)
(Note 3)
ns
ns
ns
ns
t
- t
⏐ PHL PLH ⏐
Receiver Skew
t
- t
⏐ PHL PLH ⏐
V
CC
= 3.3V, ꢁ = +25°C,
A
R = 3kΩ to 7kΩ,
L
C = 150pF
L
to 1000pF
ꢁransition-Region Slew Rate
measured from +3V to -3V
or -3V to +3V, one trans-
mitter switching
6
30
V/µs
TIMING CHARACTERISTICS—MAX3225E/MAX3227E/MAX3245E
(V
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V 10ꢀ% C = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V 10ꢀ% ꢁ = ꢁ
to ꢁ
,
MAX
CC
1
A
MIN
unless otherwise noted. ꢁypical values are at ꢁ = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R = 3kΩ, C = 1000pF,
L
L
250
one transmitter switching
V
= 3.0V to 4.5V, R = 3kΩ,
CC
L
L
Maximum Data Rate
1000
1000
kbps
C = 250pF, one transmitter switching
V
CC
= 4.5V to 5.5V, R = 3kΩ,
L
C = 1000pF, one transmitter switching
L
t
t
0.15
0.15
200
200
25
PHL
Receiver Propagation Delay
R_IN to R_OUꢁ, C = 150pF
L
µs
PLH
Receiver Output Enable ꢁime
Receiver Output Disable ꢁime
ꢁransmitter Skew
Normal operation (MAX3245E only)
Normal operation (MAX3245E only)
(Note 3)
ns
ns
ns
ns
t
- t
⏐ PHL PLH ⏐
Receiver Skew
t
- t
50
⏐ PHL PLH ⏐
V
CC
= 3.3V, ꢁ = +25°C,
A
R = 3kΩ to 7kΩ, C = 150pF to 1000pF,
measured from +3V to -3V or -3V to +3V,
one transmitter switching
L
L
ꢁransition-Region Slew Rate
24
150
V/µs
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3: ꢁransmitter skew is measured at the transmitter zero cross points.
4
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±Mbps,V3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
__________________________________________TypicalVOpePatingVChaPactePistics
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C , ꢁ = +25°C, unless otherwise noted.)
L
A
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
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
120kbps
+SLEW
-1
-2
-3
-4
-5
-6
6
20kbps
4
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
V
2
OUT-
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
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225E)
180
160
140
120
100
80
36
34
32
30
28
26
24
22
20
LOAD = 3kΩ + C
L
AVERAGE: 10 PARTS
60
40
20
0
0
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
5
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±Mbps,V3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
_____________________________TypicalVOpePatingVChaPactePisticsV(continued)
(V = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C , ꢁ = +25°C, unless otherwise noted.)
L
CC
A
MAX3244E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3244E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3244E
SLEW RATE vs. LOAD CAPACITANCE
6
5
14
12
10
8
60
50
40
30
20
10
0
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
V
OUT+
4
3
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
250kbps
2
120kbps
1
0
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
70
7.5
5.0
2.5
0
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
2Mbps
-2.5
-5.0
-7.5
1Mbps
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
TRANSMITTER SKEW
vs. LOAD CAPACITANCE
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
50
45
40
35
30
25
20
15
10
5
100
90
80
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
0
0
1000
2000
3000
0
400
800
1200
1600
2000
6
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±Mbps,V3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
______________________________________________________________ -inVSescPiption
PIN
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
SO/ SSOP/ TSSOP
NAME
FUNCTION
MAX3245E
TQFN
DIP/
SSOP/
TQFN
SSOP/
TSSOP
TQFN
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
5
6
7
16
15
1
2
3
4
5
6
7
28
27
24
1
31
30
26
33
34
35
C1+
V+
+5.5V generated by the
charge pump
Negative Terminal of Voltage-
Doubler Charge-Pump
Capacitor
C1-
C2+
C2-
V-
Positive Terminal of Inverting
Charge-Pump Capacitor
3
2
Negative Terminal of
Inverting Charge-Pump
Capacitor
4
3
2
-5.5V Generated by the
Charge Pump
5
4
3
6, 15
7, 14
8, 17
9, 16
10
5
13
8
9, 10, 11
4-8
7, 8, 9
1-5
T_OUT
R_IN
RS-232 Transmitter Outputs
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
Maxim Integrated
7
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
-inVSescPiptionV(continued)
PIN
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
SO/ SSOP/ TSSOP
NAME
FUNCTION
MAX3245E
TQFN
DIP/
SSOP/
SSOP/
TSSOP
TQFN
TQFN
TSSOP
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
GND
16
17
18
19
11
12
14
15
25
26
27
29
Ground
+3.0V to +5.5V Single Supply
Voltage
V
CC
Force-Off Input, Active Low.
Drive low to shut down
transmitters, receivers
(except R2OUTB), and
charge pump. This overrides
AutoShutdown Plus and
FORCEON (Table 1).
18
20
13
16
22
24
FORCEOFF
TTL/CMOS Noninverting
Complementary Receiver
Outputs. Always active.
—
—
—
—
—
—
—
—
—
—
—
—
20
—
—
21
R2OUTB
N.C.
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
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.
_______________SetailedVSescPiption
SualVChaPgeD-umpVkoltageVConvePteP
ꢁhe 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. ꢁhe charge
pump operates in discontinuous mode: if the output
voltages are less than 5.5V, the charge pump is
ꢁhe READY output (MAX3224E–MAX3227E) is low
when the charge pumps are disabled in shutdown
mode. ꢁhe READY signal asserts high when V- goes
below -4V.
8
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
V
CC
PROTECTION
DIODE
PREVIOUS
RS-232
MAX3244E
MAX3245E
V
CC
I
Rx
Tx
5kΩ
UART
GND
SHDN = GND
I/O
CHIP
WITH
UART
CPU
RS-232
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
μP
LOGIC
TRANSITION
DETECTOR
MAX3244E
MAX3245E
Figure 1. Interface Under Control of PMU
I
PROTECTION
DIODE
R2OUTB
RED232VTPansmittePsV
ꢁhe transmitters are inverting level translators that
convert CMOS-logic levels to 5.0V EIA/ꢁIA-232 levels.
ꢁhe 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 com-
V
CC
R2IN
Rx
R2OUT
THREE-STATED
UART
5kΩ
T1OUT
T1IN
®
munication software (such as LapLink ). ꢁransmitters
Tx
can be paralleled to drive multiple receivers. Figure 1
shows a complete system connection.
GND
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. ꢁhe transmitter inputs
do not have pullup resistors. Connect unused inputs to
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.
Figure 2. ꢁhe MAX3244E/MAX3245E detect RS-232 activity
when the UARꢁ and interface are shut down.
GND or V
.
CC
LapLink is a stered trademark of Laplink Software, Inc.
Maxim Integrated
9
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
Table 1. Output Control Truth Table
R_OUT
(MAX3224E/
RECEIVER OR
VALID
RECEIVER
LEVEL
R_OUT
R2OUTB
OPERATION
STATUS
TRANSMITTER
EDGE WITHIN
30s
FORCEON
T_OUT MAX3225E/ (MAX3244E/ (MAX3244E/
FORCEOFF
MAX3226E/
MAX3227E)
MAX3245E)
High-Z
MAX3245E)
Active
Shutdown
(Forced Off)
X
1
0
1
X
X
X
X
High-Z
Active
Active
Active
Normal
Operation
(Forced On)
Active
Active
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
Yes
INVALID*
Normal
Operation
1
1
X
Yes
No
Active
High-Z
Active
Active
Active
Active
Active
Active
INVALID*
INVALID*
Shutdown
No
Normal
Operation
(AutoShutdown)
Yes
No
X
X
Active
High-Z
Active
Active
Active
High-Z
Active
Active
INVALID*
INVALID*
INVALID**
INVALID**
Shutdown
(AutoShutdown)
X = Don’t care
* INVALID connected to FORCEON
** INVALID connected to FORCEON and FORCEOFF
ꢁhe MAX3224E–MAX3227E/MAX3244E/MAX3245E fea-
ture 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 receiv-
er input’s condition, it is independent of FORCEON and
FORCEOFF states (Figures 3 and 4).
RED232VReceivePsV
ꢁhe receivers convert RS-232 signals to CMOS-logic
output levels. ꢁhe MAX3224E–MAX3227E feature
inverting outputs that always remain active (ꢁable 1).
ꢁhe MAX3244E/MAX3245E have inverting three-state
outputs that are high impedance when shut down
(FORCEOFF = GND) (ꢁable 1).
AutoEhutdownV-lusVMode
ꢁhe MAX3224E–MAX3227E/MAX3244E/MAX3245E
achieve a 1µA supplycurrent 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. ꢁhis occurs
if the RS-232 cable is disconnected or if the connected
ꢁhe MAX3244E/MAX3245E feature an extra, always
active, noninverting output, R2OUꢁB. R2OUꢁB 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. ꢁhis is ideal for sys-
tems where V
is set to ground in shutdown to
CC
accommodperipherals such as UARꢁs (Figure 2).
10
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
+0.3V
EDGE
DETECT
T_IN
R_IN
FORCEOFF
S
30s
TIMER
R_IN
-0.3V
AUTOSHDN
30μs
TIMER
R
INVALID
EDGE
DETECT
R
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 3d. Power-Down Logic
Figure 3b. INVALID Functional Diagram, INVALID High
When shut down, the device’s charge pumps turn off,
V+ is pulled to V , V- is pulled to ground, the transmit-
CC
Table 2. INVALID Truth Table
ter outputs are high impedance, and READY
(MAX3224E–MAX3227E) is driven low. ꢁhe time
required to exit shutdown is typically 100µs (Figure 8).
RS-232 SIGNAL
PRESENT AT ANY
RECEIVER INPUT
INVALID OUTPUT
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.
Yes
No
High
Low
peripheral transmitters are turned off, and the UARꢁ dri-
ving the transmitter inputs is inactive. ꢁhe system turns
on again when a valid transition is applied to any
RS-232 receiver or transmitter input. As a result, the sys-
tem 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 ꢁables 1 and 2 sum-
marize 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 tnsmitter input edge received.
+0.3V
0
INVALID LOW
INDETERMINATE
INVALID HIGH
-0.3V
-2.7V
Figure 4a. Receiver Positive/Negative ꢁhresholds for INVALID
Maxim Integrated
11
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
RECEIVER
INPUTS
INVALID
REGION
}
TRANSMITTER
INPUTS
TRANSMITTER
OUTPUTS
V
INVALID
OUTPUT
CC
0
t
INVL
t
INVH
t
AUTOSHDN
t
AUTOSHDN
t
t
WU
WU
*V
CC
0
READY
V+
V
CC
0
V-
*MAX3224E–MAX3227E
Figure 4b. AutoShutdown Plus, INVALID, and READY ꢁiming Diagram
discharges encountered during handling and assembly.
ꢁhe driver outputs and receiver inputs of the
MAX3224E–MAX3227E/MAX3244E/MAX3245E have extra
protection against static electricity. Maxim’s engineers
have developed state-of-the-art structures to protect
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
functionality as AutoShutdown feature on MAX3221E/
MAX3223E/MAX3243E).
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
0.1μF
1MΩ
UNIT
FORCEOFF FORCEON
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
EoftwaPeDContPolledVEhutdownV
If direct software control is desired, use INVALID to
indicate DꢁR or ring indicator signal. ꢁie FORCEOFF
and FORCEON together to bypass the AutoShutdown
Plus so the line acts like a SHDN input.
±±15kV ESV-PotectionV
As with all xim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
Figure 5. AutoShutdown Plus Initial ꢁurn-On to Wake Up a
Mouse or Another System
12
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
R
50MΩ to 100MΩ
R 330Ω
D
R
1MΩ
R 1500Ω
D
C
C
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 ꢁest Model
Figure 7a. IEC 1000-4-2 ESD ꢁest Model
I
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
100%
90%
I
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
60ns
these pins against ESD of 15kV without damage. ꢁhe
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.
Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
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:
Human Body Model
Figure 6a shows the Human Body Model and Figure 6b
shows the current waveform it generates when dis-
charged into a low impedance. ꢁhis model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩ resistor.
1) 15kV using the Human Body Model
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
13
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
IEC 1000-4-2
ꢁhe IEC 1000-4-2 standard covers ESD testing and per-
5V/div
0
FORCEON = FORCEOFF
T1OUT
formance of finished equipment% it does not specifically
refer to integrated circuits. ꢁhe MAX3224E–MAX3227E,
MAX3244E/MAX3245E help you design equipment that
meets Level 4 (the highest level) of IEC 1000-4-2, with-
out the need for additional ESD-protection components.
2V/div
0
ꢁhe 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.
T2OUT
READY
V
= 3.3V
CC
5V/div
0
C1–C4 = 0.1μF
5μs/div
Figure 8. ꢁransmitter Outputs when Exiting Shutdown or
Powering Up
ꢁhe Air-Gap Method involves approaching the device
with a charged probe. ꢁhe Contact-Discharge Method
connects the probe to the device before the probe is
energized.
can be used. ꢁhe charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, see
ꢁable 3 for required capacitor values. Do not use val-
ues smaller than those listed in ꢁable 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,
Machine Model
ꢁhe Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and
outputs. ꢁherefore, after PC board assembly, the
Machine Model is less relevant to I/O ports.
and C
, to maintain the proper ratios (C1 to
BYPASS
the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. ꢁhe capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
__________ApplicationsVInfoPmation
CapacitoPVEelectionV
ꢁhe capacitor type used for C1–C4 is not critical for
proper operation% polarized or nonpolarized capacitors
Table 3. Required Minimum Capacitance
Values
-owePDEupplyVSecouplingV
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 capaci-
tors as close to the IC as possible.
C1, C
C2, C3, C4
(µF)
V
(V)
BYPASS
CC
(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
0.22
0.1
0.33
1
TPansmittePVOutputsV
whenV xitingVEhutdownV
Figure 8 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high, the other is low). Each
0.047
0.22
14
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
transmitter is loaded with 3kΩ in parallel with 1000pF.
ꢁhe transmitter outputs display no ringing or undesir-
able 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
HighVSataVRatesV
ꢁhe 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 loopback 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 dri-
ven at 250kbps, and all transmitters were loaded with
an RS-232 receiver in parallel with 250pF.
T1OUT
R1OUT
V
= 3.3V
CC
2μs/div
Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback ꢁest
Result at 120kbps
ꢁhe MAX3225E/MAX3227E/MAX3245E maintain the
RS-232 5.0V minimum transmitter output voltage at
data rates up to 1Mbps (MegaBaud). Figure 12 shows
a loopback 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
= 3.3V
CC
V
CC
2μs/div
C1+
V+
V-
C3*
C4
C1
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback ꢁest
Result at 250kbps
C1-
C2+
C2
C2-
5V/div
5V/div
5V/div
T1IN
T_ OUT
T_ IN
R_ IN
R_ OUT
T1OUT
5kΩ
1000pF
FORCEON
FORCEOFF
V
CC
R1OUT
GND
V
= 3.3V
CC
200ns/div
*C3 CAN BE RETURNED TO V OR GND.
CC
Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback ꢁest
Result at 1Mbps
Figure 9. Loack ꢁest Circuit
Maxim Integrated
15
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
+3.3V
26
0.1μF
V
CC
27
3
28
C1+
V+
C1
0.1μF
C3
0.1μF
24
1
C1-
C2+
COMPUTER SERIAL PORT
MAX3244E
MAX3245E
V-
C4
C2
0.1μF
0.1μF
2
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
4
5
19
18
17
5kΩ
R2IN
R3IN
R4IN
R5IN
LOGIC
OUTPUTS
5kΩ
5kΩ
6
7
8
RS-232
INPUTS
R4OUT
R5OUT
16
5kΩ
5kΩ
SERIAL
MOUSE
15
23
FORCEON
FORCEOFF
INVALID
22
21
V
CC
TO POWER-
MANAGEMENT
UNIT
GND
25
Figure 13a. use Driver ꢁest Circuit
16
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
MouseVSPiveabilityV
6
ꢁhe MAX3244E/MAX3245E are specifically designed to
5
power serial mice while operating from low-voltage
V
4
3
OUT+
power supplies. ꢁhey have been tested with leading
mouse brands from manufacturers such as Microsoft
and Logitech. ꢁhe MAX3244E/MAX3245E successfully
drove all serial mice tested and met their respective
current and voltage requirements. ꢁhe 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.
V
V
= 3.0V
CC
2
V
V
1
OUT+
0
-1
-2
-3
-4
-5
-6
CC
1
OUT-
V
OUT-
9
0
2
3
4
5
6
7
8
10
IntePconnectionVwithV3kVandV1kVLogicV
ꢁhe MAX3224E–MAX3227E/MAX3244E/MAX3245E can
directly interface with various 5V logic families, includ-
ing ACꢁ and HCꢁ CMOS. See ꢁable 4 for more informa-
tion on possible combinations of interconnections.
LOAD CURRENT PER TRANSMITTER (mA)
Figure 13b. MAX324_E ꢁransmitter Output Voltage vs. Load
Current per ꢁransmitter
ꢁable 5 lists other Maxim ESD-powered transceivers.
Table 4. Logic Family Compatibility with Various Supply Voltages
SYSTEM
V
CC
SUPPLY
POWER-SUPPLY
VOLTAGE (V)
VOLTAGE
(V)
COMPATIBILITY
3.3
5
3.3
5
Compatible with all CMOS families
Compatible with all ꢁꢁL and CMOS families
5
3.3
Compatible with ACꢁ and HCꢁ 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
SUPPLY
CURRENT
(µA)
NO.
OF
Tx/Rx
Auto-
Shutdown
Plus
GUARANTEED
DATA RATE
(kbps)
Auto-
Body
Contact
Discharge
(kV)
Air-Gap
Discharge
(kV)
PART
Shutdown Model
(kV)
MAX3241E +3.0 to +5.5
MAX3243E +3.0 to +5.5
MAX3244E +3.0 to +5.5
MAX3245E +3.0 to +5.5
MAX3232E +3.0 to +5.5
MAX3222E +3.0 to +5.5
MAX3223E +3.0 to +5.5
MAX3224E +3.0 to +5.5
MAX3225E +3.0 to +5.5
MAX3221E +3.0 to +5.5
MAX3226E +3.0 to +5.5
MAX3227E +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
17
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
___________________________________________________TypicalVOpePatingVCiPcuits
+3.3V
26
+3.3V
15
C
BYPASS
0.1μF
0.1μF
C
BYPASS
V
V
CC
CC
3
7
2
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-
C2+
C1-
C2+
MAX3226E*
MAX3227E
MAX3244E***
MAX3245E
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
BYPASS
R2OUT
R3OUT
R4OUT
V
18
17
16
CC
3
7
2
C1+
V+
V-
C1
0.1μF
C3
0.1μF
4
5
6
C1-
C2+
MAX3224E**
MAX3225E
6
7
R3IN
R4IN
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
18
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
___________________________________________________________ -inVConfiguPations
+
+
+
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
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
C1-
T1OUT
R1IN
C1-
C2+
C2-
V-
13 T1OUT
MAX3226E
MAX3227E
4
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T2OUT
T3OUT
T3IN
T2IN
T1IN
GND
4
MAX3224E
MAX3225E
C2+
C2-
FORCEON
5
C1-
12
5
MAX3244E
MAX3245E
R1OUT
FORCEON
11 T1IN
10 INVALID
6
FORCEON
FORCEOFF
INVALID
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
6
V-
7
7
T2OUT
9
13 T1IN
R1IN
R1OUT
8
8
R2IN
T2IN
12
9
9
SSOP/TSSOP
R2OUT
INVALID
11
10
10
11
12
13
14
DIP/SSOP/TSSOP
TOP VIEW
15
14
13
12
11
SO/SSOP/TSSOP
T2IN
10
9
GND 16
INVALID
V
CC
17
8
FORCEOFF 18
READY 19
R2OUT
R2IN
TOP VIEW
MAX3224E
MAX3225E
7
36 35 34 33 32 31 30 29 28
*EP
+
20
6
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
R5IN
MAX3245E
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
TQFN
READY 14
V+ 15
INVALID
R1OUT
R1IN
MAX3226E
MAX3227E
16
C1+
*EP
+
1
2
3
4
TQFN
*CONNECT EP TO GND.
Maxim Integrated
19
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
OPdePingVInfoPmationV(continued)
ChipVInfoPmation
PROCESS: BICMOS
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
PIN-PACKAGE
20 TSSOP
MAX3225ECUP+
MAX3225ECTP+
MAX3225ECAP+
MAX3225ECPP+
MAX3225EETP+
MAX3225EEUP+
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+
-ac5ageVInfoPmation
20 TQFN-EP*
20 SSOP
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.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.
20 Plastic DIP
20 TQFN -EP*
20 TSSOP
20 SSOP
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
20 Plastic DIP
16 SSOP
16 TSSOP
16 TQFN-EP
20 DIP
A16+2
U16+1
T1655+2
P20+3
21-0056
21-0066
21-0140
21-0043
21-0056
21-0066
21-0140
21-0042
21-0056
21-0066
21-0141
90-0106
90-0117
90-0072
—
-40°C to +125°C 20 SSOP
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
16 TQFN-EP*
16 TSSOP
16 SSOP
16 SSOP
20 SSOP
A20+1
90-0094
90-0116
90-0010
90-0109
90-0095
90-0171
90-0050
16 TQFN-EP*
16 TSSOP
20 TSSOP
20 TQFN-EP
28 Wide SO
28 SSOP
U20+2
T2055+5
W28+6
A28+1
-40°C to +125°C 16 SSOP
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
16 SSOP
16 TQFN-EP*
16 TSSOP
16 SSOP
28 TSSOP
36 TQFN
U28+2
T3666+3
16 SSOP
16 TQFN-EP*
16 TSSOP
-40°C to +125°C 16 SSOP
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
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
28 Wide SO
28 SSOP
28 TSSOP
28 Wide SO
28 SSOP
28 TSSOP
28 Wide SO
28 SSOP
36 TQFN- EP*
28 SSOP
28 WIDE SO
28 TSSOP
36 TQFN- EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
20
Maxim Integrated
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±±15kV ESD-Potected,V±µA,V±MbpsV3.0kVtoV1.1k,
RED232VTPansceivePsVwithVAutoEhutdownV-lus
RevisionVHistoPy
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
Added an automotive qualified part to the Ordering Information; changed all the
parts listed in the Ordering Information to lead free
10
3/11
1, 20
Maxim cannot me responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim 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.
21
The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
©
2011 Maxim Integrated
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