MAX3224ECPP [MAXIM]
【15kV ESD-Protected, 1レA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus; ± 15kV ESD保护， 1μA ，为1Mbps ， 3.0V至5.5V ， RS - 232收发器，具有自动关机加
| 型号： | MAX3224ECPP |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 【15kV ESD-Protected, 1レA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus |
| 文件： | 总20页 (文件大小：244K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1339; Rev 0; 1/98
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7/MAX3245E
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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-
tie s , a nd e nha nc e d e le c tros ta tic d is c ha rg e (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.
♦ ESD Protection for RS-232 I/O Pins:
±15kV—Human Body Model
±8kV—IEC1000-4-2, Contact Discharge
±15kV—IEC1000-4-2, Air-Gap Discharge
♦ Latchup Free
♦ 1µA Supply Current
♦ AutoShutdown Plus—EDN Innovation of the Year
♦ Guaranteed Data Rate:
All devices achieve a 1µA supply current using Maxim’s
re volutiona ry AutoShutd own Plus ™ fe a ture . The s e
d e vic e s a utoma tic a lly e nte r a low-p owe r s hutd own
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 receiv-
e r inp ut. AutoShutd own Plus s a ve s p owe r without
changes to the existing BIOS or operating system.
250kbps (MAX3224E/3226E/3244E)
1Mbps (MAX3225E/3227E/3245E)
♦ Guaranteed Slew Rate:
6V/µs (MAX3224E/3226E/3244E)
24V/µs (MAX3225E/3227E/3245E)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Guaranteed Mouse Driveability
(MAX3244E/3245E)
The MAX3225E/MAX3227E/MAX3245E a ls o fe a ture
MegaBaud™ operation, guaranteeing 1Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224E/MAX3226E/MAX3244E guar-
antee 250kbps operation. The transceivers have a pro-
prietary 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.
♦ Ready-to-Transmit Logic-Level Output
_______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 SSOP
MAX3224ECPP
MAX3224ECAP
MAX3224EEPP
MAX3224EEAP
MAX3225ECPP
MAX3225ECAP
MAX3225EEPP
MAX3225EEAP
20 Plastic DIP
20 SSOP
20 Plastic DIP
20 SSOP
All devices are available in a space-saving SSOP pack-
age.
20 Plastic DIP
20 SSOP
________________________Ap p lic a t io n s
Ordering Information continued at end of data sheet.
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
_____________________ S e le c t o r Gu id e
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
NO. OF
DRIVERS/
RECEIVERS
GUARANTEED
DATA RATE
(bps)
AUTO-
SHUTDOWN
PLUS
READY
OUTPUT
PART
Printers
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
2/2
2/2
1/1
1/1
3/5
3/5
250k
1M
AutoShutdown Plus and MegaBaud are trademarks of
Maxim Integrated Products.
250k
1M
†
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577;
4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other
patents pending.
250k
1M
—
—
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND..............................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
E
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
16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C)........... 1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
Operating Temperature Ranges
MAX32_ _EC_ _ .................................................0°C to +70°C
MAX32_ _EE_ _................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°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
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.
ELECTRICAL CHARACTERISTICS
(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
CC
to T
,
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V = 3.3V or 5.0V, T = +25°C)
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
FORCEOFF = GND
Supply Current,
AutoShutDown Plus Disabled
0.3
mA
FORCEON = FORCEOFF = V , no load
CC
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
0.8
V
V
T_IN, FORCEON, FORCEOFF
V
CC
= 3.3V
= 5.0V
2
T_IN, FORCEON,
Input Logic Threshold High
FORCEOFF
V
CC
2.4
Transmitter Input Hysteresis
Input Leakage Current
0.5
V
±0.01
±1
±10
0.4
µA
T_IN, FORCEON, FORCEOFF
R_OUT (MAX3244E/MAX3245E), receivers
disabled
Output Leakage Current
±0.05
µA
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
I
= 1.6mA
= -1.0mA
V
V
OUT
I
V
- 0.6 V - 0.1
CC CC
OUT
–7E/MAX3245
-25
0.6
0.8
+25
V
V
V
= 3.3V
= 5.0V
= 3.3V
= 5.0V
1.2
1.5
1.5
1.8
0.5
5
CC
Input Threshold Low
Input Threshold High
T
= +25°C
= +25°C
A
V
CC
V
CC
2.4
2.4
T
A
V
V
CC
Input Hysteresis
Input Resistance
V
T
A
= +25°C
3
7
kΩ
2
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
ELECTRICAL CHARACTERISTICS (continued)
(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
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +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
10M
V
Output Resistance
V
CC
= V+ = V- = 0, transmitter outputs = ±2V
300
Ω
Output Short-Circuit Current
±60
±25
mA
V
= 0 or 3V to 5.5V, V
= ±12V,
CC
OUT
Output Leakage Current
µA
Transmitters disabled
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
ESD PROTECTION
R_IN, T_OUT
±5
V
IEC1000-4-2 Air Discharge
IEC1000-4-2 Contact Discharge
Human Body Model
±15
±8
kV
±15
AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF = V
)
CC
Positive threshold
Negative threshold
2.7
Receiver Input Threshold to
INVALID Output High
Figure 4a
Figure 4a
V
V
-2.7
-0.3
Receiver Input Threshold to
INVALID Output Low
0.3
0.4
INVALID, READY
Output Voltage Low
(MAX3224E–MAX3227E)
I
= -1.6mA
V
V
OUT
INVALID, READY
Output Voltage High
I
= -1.0mA
V
- 0.6
OUT
CC
(MAX3224E–MAX3227E)
Receiver Positive or Negative
Threshold to INVALID High
t
V
= 5V, Figure 4b
= 5V, Figure 4b
CC
1
µs
µs
INVH
CC
Receiver Positive or Negative
Threshold to INVALID Low
t
V
30
INVL
Receiver or Transmitter Edge to
Transmitters Enabled
t
V
= 5V, Figure 5b (Note 2)
= 5V, Figure 5b (Note 2)
100
30
µs
WU
CC
E
Receiver or Transmitter Edge to
Transmitters Shutdown
tAUTOSHDN
V
CC
15
60
sec
_______________________________________________________________________________________
3
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
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
L
A
MIN
MAX
E
unless otherwise noted. Typical values are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
= 3kΩ, C = 1000pF,
MIN
TYP
MAX
UNITS
R
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_OUT, C = 150pF
L
µs
PLH
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (MAX3244E only)
Normal operation (MAX3244E only)
(Note 3)
ns
ns
ns
ns
t
t
- t
PHL PLH
- t
Receiver Skew
PHL PLH
C
= 150pF
L
V
= 3.3V, T = +25°C,
A
= 3kΩ to 7kΩ,
CC
6
4
30
30
to 1000pF
R
L
Transition-Region Slew Rate
V/µs
measured from +3V to -3V
or -3V to +3V
C
= 150pF
L
to 2500pF
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
L
A
MIN
MAX
unless otherwise noted. Typical values are at T = +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,
= 250pF, one transmitter switching
CC
L
Maximum Data Rate
1000
1000
kbps
C
L
V
= 4.5V to 5.5V, R = 3kΩ,
L
= 1000pF, one transmitter switching
CC
C
L
t
t
0.15
0.15
200
200
25
PHL
PLH
Receiver Propagation Delay
R_IN to R_OUT, C = 150pF
L
µs
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (MAX3245E only)
Normal operation (MAX3245E only)
(Note 3)
ns
ns
ns
ns
t
t
- t
PHL PLH
- t
Receiver Skew
50
PHL PLH
V
CC
= 3.3V, T = +25°C,
A
Transition-Region Slew Rate
R
L
= 3kΩ to 7kΩ, C = 150pF to 1000pF,
24
150
V/µs
L
measured from +3V to -3V or -3V to +3V
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.
–7E/MAX3245
4
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L
CC
A
MAX3224E/MAX3226E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224E/MAX3226E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224E/MAX3226E
SLEW RATE vs. LOAD CAPACITANCE
16
14
12
10
8
6
5
4
3
2
1
0
45
40
35
30
25
20
15
10
5
V
OUT+
250kbps
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
-SLEW
120kbps
+SLEW
-1
-2
-3
-4
-5
-6
6
20kbps
4
2
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
V
OUT-
FOR DATA RATES UP TO 250kbps
0
0
0
1000
2000
3000
4000
5000
0
0
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
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
7.5
5.0
2.5
0
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225E)
2Mbps
LOAD = 3kΩ + C
L
-SLEW
+SLEW
1.5Mbps
1Mbps
2Mbps
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225E)
1.5Mbps
LOAD = 3kΩ + C
L
1.5Mbps
2Mbps
1Mbps
-2.5
-5.0
-7.5
1Mbps
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225E)
0
500
1000
1500
2000
2500
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3224E–MAX3227E
READY TURN-OFF TIME
vs. TEMPERATURE
MAX3224E–MAX3227E
READY TURN-ON TIME
vs. TEMPERATURE
MAX3225E/MAX3227E
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
50
45
40
35
30
25
20
15
10
5
200
180
160
140
120
100
80
38
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225E)
36
34
32
30
28
26
24
22
20
E
LOAD = 3kΩ + C
L
AVERAGE; 10 PARTS
60
40
20
0
0
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
E
(V = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C , T = +25°C, unless otherwise noted.)
L
CC
A
MAX3244E
MAX3244E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3244E
SLEW RATE vs. LOAD CAPACITANCE
OPERATING SUPPLY CURRENT
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
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
–7E/MAX3245
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
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
6
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
MAX3224E MAX3226E MAX3244E
MAX3225E MAX3227E MAX3245E
Ready to Transmit Output, active-high. READY is enabled high when
V- goes below -4V and the device is ready to transmit.
1
1
—
READY
2
2
3
28
27
C1+
V+
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
+5.5V generated by the charge pump
3
4
5
4
24
C1-
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V generated by the charge pump
5
1
C2+
6
6
2
C2-
7
7
3
V-
8, 17
9, 16
10, 15
13
8
9–11
4–8
15–19
T_OUT
R_IN
R_OUT
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
9
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.
11
12, 13
14
10
11
12
21
12–14
23
INVALID
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).
FORCEON
GND
18
19
14
15
25
26
Ground
V
CC
+3.0V to +5.5V Single Supply Voltage
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).
20
—
16
—
22
20
FORCEOFF
R2OUTB
TTL/CMOS Noninverting Complementary Receiver Outputs. Always active.
The READY outp ut (MAX3224E–MAX3227E) is low
_______________De t a ile d De s c rip t io n
whe n the c ha rg e p ump s a re d is a b le d in s hutd own
mode. The READY signal asserts high when V- goes
below -4V.
Du a l Ch a rg e -P u m p Vo lt a g e Co n ve rt e r
The MAX3224E–MAX3227E/MAX3244E/MAX3245E’s
inte rna l p owe r s up p ly c ons is ts of a re g ula te d d ua l
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
volta g e s a re le s s tha n 5.5V, the c ha rg e p ump is
e na b le d ; if the outp ut volta g e s e xc e e d 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.
E
RS -2 3 2 Tra n s m it t e rs
The tra ns mitte rs a re inve rting le ve l tra ns la tors tha t
convert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3224E/MAX3226E/MAX3244E g ua ra nte e a
250kb p s
M A X 3
d a ta
ra te
(1Mb p s ,
M A X 3
for
2
the
7 E /
2
2
5
E
/
2
MAX3245E) with worst-case loads of 3kΩ in parallel with
1000pF, providing compatibility with PC-to-PC com-
LapLink is a trademark of Traveling Software.
_______________________________________________________________________________________
7
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
V
CC
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
E
PROTECTION
DIODE
PREVIOUS
RS-232
MAX3244E
MAX3245E
V
CC
I
Rx
Tx
5k
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
I
Figure 1. Interface Under Control of PMU
PROTECTION
DIODE
R2OUTB
munication software (such as LapLink™). Transmitters
can be paralleled to drive multiple receivers. Figure 1
shows a complete system connection.
V
CC
R2IN
Rx
R2OUT
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 30sec, 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 pull-up resistors. Connect unused inputs to
THREE-STATED
UART
5k
T1OUT
T1IN
Tx
GND
FORCEOFF = GND
GND or V
.
CC
–7E/MAX3245
RS -2 3 2 Re c e ive rs
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.
The receivers convert RS-232 signals to CMOS-logic
outp ut le ve ls . The MAX3224E–MAX3227E fe a ture
inverting outputs that always remain active (Table 1).
The MAX3244E/MAX3245E have inverting three-state
Figure 2. The MAX3244E/MAX3245E detect RS-232 activity
when the UART and interface are shut down.
8
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
Table 1. Output Control Truth Table
R_OUT
(MAX3224E/
RECEIVER OR
VALID
RECEIVER
LEVEL
R_OUT
R2OUTB
OPERATION
STATUS
TRANSMITTER
EDGE WITHIN
30sec
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
Active
Active
Active
Active
Active
Active
INVALID*
INVALID*
Shutdown
No
High-Z
Normal
Operation
(AutoShutdown)
Yes
No
X
X
Active
Active
Active
Active
Active
Active
INVALID*
INVALID*
INVALID**
INVALID**
Shutdown
(AutoShutdown)
High-Z
High-Z
X = Don’t care
* INVALID connected to FORCEON
** INVALID connected to FORCEON and FORCEOFF
outp uts tha t a re hig h imp e d a nc e whe n s hut d own
er input’s condition, it is independent of FORCEON and
(FORCEOFF = GND) (Table 1).
FORCEOFF states (Figures 3 and 4).
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 sys-
Au t o S h u t d o w n P lu s Mo d e
The MAX3224E–MAX3227E/MAX3244E/MAX3245E
achieve a1µAsupplycurrent 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 30sec, 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
peripheral transmitters are turned off, and the UART dri-
ving the transmitter inputs is inactive. The system turns
on a g a in whe n a va lid tra ns ition is a p p lie d to a ny
RS-232 receiver or transmitter input. As a result, the sys-
E
te ms whe re V
is s e t to g round in s hutd own to
CC
accommodate peripherals such as UARTs (Figure 2).
The 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-
_______________________________________________________________________________________
9
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
EDGE
DETECT
+0.3V
T_IN
FORCEOFF
E
S
R_IN
AUTOSHDN
30sec
TIMER
30µs
TIMER
R
INVALID
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 3d. Power-Down Logic
Figure 3b. INVALID Functional Diagram, INVALID High
(MAX3224E– MAX3227E) is d rive n low. The time
required to exit shutdown is typically 100µs (Figure 8).
Table 2. INVALID Truth Table
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 30sec, and wake up when a valid receiver
level or receiver or transmitter edge is detected.
RS-232 SIGNAL
PRESENT AT ANY
RECEIVER INPUT
INVALID OUTPUT
Yes
No
High
Low
By connecting FORCEON and FORCEOFF to INVALID,
the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut
down when no valid receiver level is detected and
tem saves power without changes to the existing BIOS
or operating system.
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 sum-
ma rize the op e ra ting mod e s of the MAX3224E–
MAX3227E/MAX3244E/MAX3245E. FORCEON a nd
FORCEOFF ove rrid e AutoShutd own Plus c irc uitry.
Whe n ne ithe r c ontrol is a s s e rte d , the IC s e le c ts
between these states automatically based on the last
receiver or transmitter input edge received.
INVALID HIGH
+2.7V
INDETERMINATE
+0.3V
0
–7E/MAX3245
INVALID LOW
-0.3V
INDETERMINATE
-2.7V
When shut down, the device’s charge pumps turn off,
INVALID HIGH
V+ is pulled to V , V- is pulled to ground, the transmit-
CC
te r outp uts a re hig h imp e d a nc e , a nd READY
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
10 ______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
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
OUTPUT
0
V+
V
CC
0
V-
*MAX3224E–MAX3227E
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
wake up when a valid receiver level is detected (same
functionality as AutoShutdown feature on MAX3221E/
MAX3223E/MAX3243E).
have developed state-of-the-art structures to protect
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
e ve nt, Ma xim’s E ve rs ions ke e p working without
la tc hup , whe re a s c omp e ting RS-232 p rod uc ts c a n
latch and must be powered down to remove latchup.
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-
MANAGEMENT
MASTER SHDN LINE
0.1µF
1M
UNIT
S o ft w a re -Co n t ro lle d S h u t d o w n
If direct software control is desired, use INVALID to
indicate DTR or Ring Indicator signal. Tie FORCEOFF
and FORCEON together to bypass the AutoShutdown
Plus so the line acts like a SHDN input.
FORCEOFF FORCEON
E
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
±1 5 k V ES D P ro t e c t io n
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The d rive r outp uts a nd re c e ive r inp uts of the
MAX3224E–MAX3227E/MAX3244E/MAX3245E have extra
protection against static electricity. Maxim’s engineers
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
______________________________________________________________________________________ 11
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
R 50M to 100M
C
R 330Ω
D
R 1M
C
R 1500Ω
D
E
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. IEC1000-4-2 ESD Test Model
I
100%
90%
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
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
ESD p rote c tion c a n b e te s te d in va rious wa ys ; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
1) ±15kV using the Human Body Model
a 100pF capacitor charged to the ESD voltage of inter-
e s t, whic h is the n d is c ha rg e d into the te s t d e vic e
through a 1.5kΩ resistor.
2) ±8kV using the contact-discharge method specified
in IEC1000-4-2
3) ±15kV using IEC1000-4-2’s air-gap method.
IEC1000-4-2
The IEC1000-4-2 standard covers ESD testing and per-
formance 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 IEC1000-4-2, with-
out the need for additional ESD-protection components.
–7E/MAX3245
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.
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. This model consists of
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
12 ______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
lower in the IEC1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC1000-4-2 is generally
lowe r tha n tha t me a s ure d us ing the Huma n Bod y
Model. Figure 7a shows the IEC1000-4-2 model and
Figure 7b shows the current waveform for the 8kV,
IEC1000-4-2, Level 4, ESD contact-discharge test.
5V/div
0
FORCEON = FORCEOFF
T1OUT
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method connects
the probe to the device before the probe is energized.
2V/div
0
Machine Model
The Ma c hine Mod e l for ESD te s ts a ll p ins us ing 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
outp uts . The re fore , a fte r PC b oa rd a s s e mb ly, the
Machine Model is less relevant to I/O ports.
T2OUT
READY
V
= 3.3V
CC
5V/div
0
C1–C4 = 0.1µF
5µs/div
Figure 8. Transmitter Outputs when Exiting Shutdown or
Powering Up
When using the minimum required capacitor values,
ma ke s ure the c a p a c itor va lue d oe s not d e g ra d e
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
__________Ap p lic a t io n s In fo rm a t io n
Ca p a c it o r S e le c t io n
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
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 val-
ues 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,
P o w e r-S u p p ly De c o u p lin g
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.
Tra n s m it t e r Ou t p u t s
w h e n Ex it in g S h u t d o w n
and C
, to maintain the proper ratios (C1 to
BYPASS
the other capacitors).
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
transmitter is loaded with 3kΩ in parallel with 1000pF.
The 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.
Table 3. Required Minimum Capacitance
Values
V
(V)
C1, C
C2, C3, C4
(µF)
BYPASS
CC
(µF)
0.22
0.1
E
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
______________________________________________________________________________________ 13
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
Hig h Da t a Ra t e s
The MAX3224E/MAX3226E/MAX3244E maintain the
RS-232 ±5.0V minimum transmitter output voltage even
E
5V/div
5V/div
5V/div
T1IN
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
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 loopback test result with a single transmitter driven at
1Mb p s a nd a ll tra ns mitte rs loa d e d with a n RS-232
receiver in parallel with 250pF.
V
= 3.3V
CC
2µs/div
Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 120kbps
Mo u s e Drive a b ilit y
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
c urre nt a nd volta g e re q uire me nts . The MAX3244E/
5V/div
5V/div
5V/div
T1IN
T1OUT
R1OUT
V
CC
C
BYPASS
V
CC
= 3.3V
V
CC
2µs/div
C1+
V+
V-
C3*
C4
C1
Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 250kbps
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
C1-
C2+
C2
C2-
5V/div
5V/div
5V/div
T_ OUT
T1IN
T_ IN
R_ IN
5k
R_ OUT
T1OUT
–7E/MAX3245
1000pF
FORCEON
FORCEOFF
V
CC
GND
R1OUT
V
CC
= 3.3V
200ns/div
*C3 CAN BE RETURNED TO V OR GND.
CC
Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test
Result at 1Mbps
Figure 9. Loopback Test Circuit
14 ______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
+3.3V
26
0.1µF
V
CC
27
3
28
C1+
V+
C1
0.1µF
C3
0.1µF
24
1
C1-
COMPUTER SERIAL PORT
MAX3244E
MAX3245E
C2+
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
R1IN
R2IN
4
5
19
18
5k
5k
5k
LOGIC
OUTPUTS
R3OUT
R4OUT
6
7
8
R3IN
R4IN
R5IN
17
16
RS-232
INPUTS
5k
5k
SERIAL
MOUSE
R5OUT
15
23
E
FORCEON
FORCEOFF
INVALID
22
21
V
CC
TO POWER-
MANAGEMENT
UNIT
GND
25
Figure 13a. Mouse Driver Test Circuit
______________________________________________________________________________________ 15
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
MAX3245E dual charge pump ensures the transmitters
will 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
E
5
V
OUT+
4
3
V
CC
= 3.0V
2
V
1
OUT+
In t e rc o n n e c t io n w it h 3 V a n d 5 V Lo g ic
The MAX3224E–MAX3227E/MAX3244E/MAX3245E can
directly interface with various 5V logic families, includ-
ing ACT and HCT CMOS. See Table 4 for more infor-
mation on possible combinations of interconnections.
0
-1
-2
-3
-4
-5
-6
V
CC
V
OUT-
V
OUT-
Table 5 lists other Maxim ESD-powered transceivers.
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 4. Logic Family Compatibility with Various Supply Voltages
SYSTEM
V
SUPPLY
CC
POWER-SUPPLY
VOLTAGE (V)
VOLTAGE
(V)
COMPATIBILITY
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
Body
Model
(kV)
IEC 1000-4-2 IEC 1000-4-2
No.
of
Tx/Rx
Supply
Auto-
Auto-
Guaranteed
Data Rate
(kbps)
Contact
Discharge
(kV)
Air-Gap
Discharge
(kV)
Part
Current Shutdown Shutdown
(µA)
Plus
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
–7E/MAX3245
—
Yes
—
250
1
Yes
Yes
—
250
1
—
1Mbps
250
1
Yes
—
1
Yes
Yes
250
1
—
1Mbps
16 ______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
___________________________________________________Typ ic a l Op e ra t in g Circ u it s
+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-
C1-
MAX3226E
MAX3227E
C2+
MAX3244E
MAX3245E
C2+
V-
C4
0.1µF
C2
C2
0.1µF
C4
2
0.1µF
0.1µF
C2-
C2-
T1IN
11
9
T1IN
T1OUT 13
T1OUT
9
14
T2IN
T3IN
T2OUT 10
13
12
R1OUT
R1IN
5k
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
BYPASS
0.1µF
R2OUT
R3OUT
R4OUT
V
18
17
16
CC
3
7
2
C1+
V+
V-
C1
C3
4
5
6
0.1µF
0.1µF
C1-
MAX3224E
MAX3225E
6
7
R3IN
R4IN
C2+
C4
0.1µF
C2
0.1µF
C2-
13
12
T1IN
T1OUT 17
TTL/CMOS
INPUTS
RS-232
OUTPUTS
8
T2IN
T2OUT
R5OUT
15
R5IN
8
GND
25
16
15 R1OUT
R1IN
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5k
E
R2IN
10 R2OUT
9
5k
TO POWER-
MANAGEMENT
UNIT
AUTOSHUTDOWN
PLUS
READY
INVALID 11
1
FORCEOFF
FORCEON
20
14
V
CC
GND
18
______________________________________________________________________________________ 17
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
___________________________________________________________P in Co n fig u ra t io n s
E
READY
16 FORCEOFF
1
2
3
4
5
6
7
8
C2+
C2-
C1+
V+
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
15
14
C1+
V+
V
CC
GND
V-
V
CC
3
C1-
C2+
C2-
V-
13 T1OUT
MAX3226E
MAX3227E
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T2OUT
T3OUT
T3IN
T2IN
T1IN
GND
4
FORCEON
12
C1-
5
MAX3244E
MAX3245E
11 T1IN
10 INVALID
FORCEON
FORCEOFF
INVALID
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
6
7
9
R1IN
R1OUT
8
9
SSOP
10
11
12
13
14
READY
C1+
V+
FORCEOFF
1
2
20
19
18
17
16
15
14
13
12
11
V
CC
GND
3
C1-
T1OUT
R1IN
4
SO/SSOP
MAX3224E
MAX3225E
C2+
C2-
5
R1OUT
FORCEON
T1IN
6
V-
7
T2OUT
8
R2IN
T2IN
9
R2OUT
INVALID
10
DIP/SSOP
_Ord e rin g In fo rm a t io n (c o n t in u e d )
___________________Ch ip In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 SSOP
MAX3224E
TRANSISTOR COUNT: 1129
MAX3226ECAE*
MAX3226EEAE*
MAX3227ECAE*
MAX3227EEAE*
MAX3244ECWI
MAX3244ECAI
MAX3244EEWI
MAX3244EEAI
MAX3245ECWI
MAX3245ECAI
MAX3245EEWI
MAX3245EEAI
16 SSOP
MAX3225E
TRANSISTOR COUNT: 1129
16 SSOP
16 SSOP
MAX3226E
TRANSISTOR COUNT: 1129
28 Wide SO
28 SSOP
–7E/MAX3245
MAX3227E
TRANSISTOR COUNT: 1129
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
MAX3244E/MAX3245E
TRANSISTOR COUNT: 1335
28 Wide SO
28 SSOP
*Future product. Contact factory for availability.
18 ______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
–7E/MAX3245
________________________________________________________P a c k a g e In fo rm a t io n
E
______________________________________________________________________________________ 19
±1 5 k V ES D-P ro t e c t e d , 1 µA, 1 Mb p s , 3 .0 V t o 5 .5 V,
RS -2 3 2 Tra n s c e ive rs w it h Au t o S h u t d o w n P lu s
___________________________________________P a c k a g e In fo rm a t io n (c o n t in u e d )
E
–7E/MAX3245
Maxim cannot assume 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.
20 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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