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19-1283; Rev 2; 1/98
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
General Description
The MAX3221E/MAX3223E/MAX3243E are 3V-powered
EIA/TIA-232 and V.28/V.24 communications interfaces
with automatic shutdown/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, to ±8kV using IEC 1000-4-2 Contact
Discharge, and to ±15kV using the Human Body Model.
The MAX3221E/MAX3223E/MAX3243E achieve a
1µA supply current with Maxim’s revolutionary
AutoShutdown™ feature. They save power without
changes to the existing BIOS or operating system by enter-
ing low-power shutdown mode when the RS-232 cable is
disconnected, or when the transmitters of the connected
peripherals are off.
The transceivers have a proprietary low-dropout trans-
mitter output stage, delivering 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 capaci-
tors for operation from a +3.3V supply. Each device is
guaranteed to run at data rates of 250kbps while main-
taining RS-232 output levels.
The MAX3221E contains just one driver and one receiver,
making it the smallest single-supply RS-232 transceiver.
The MAX3223E has two drivers and two receivers. The
MAX3243E is a complete 3-driver/5-receiver serial port
ideal for notebook or subnotebook computers. It also
includes two noninverting receiver outputs that are always
active, allowing external devices to be monitored without
forward biasing the protection diodes in circuitry that may
be powered down.
The MAX3221E, MAX3223E, and MAX3243E are avail-
able in space-saving SSOP packages.
Features
o
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
o
Latchup Free
o
1µA Supply Current
o
250kbps Guaranteed Data Rate
o
6V/µs Guaranteed Slew Rate
o
Meets EIA/TIA-232 Specifications Down to 3.0V
o
Smallest Single-Supply RS-232 Transceiver
(MAX3221E)
o
Guaranteed Mouse Driveability (MAX3243E)
o
Small 0.1µF Capacitors
MAX3221E/MAX3223E/MAX3243E
†
Ordering Information
PART
MAX3221ECAE
MAX3221EEAE
MAX3223ECPP
MAX3223ECAP
MAX3223EEPP
MAX3223EEAP
MAX3243ECWI
MAX3243ECAI
MAX3243EEWI
MAX3243EEAI
TEMP. RANGE
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
16 SSOP
20 Plastic DIP
20 SSOP
20 Plastic DIP
20 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
Applications
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
PART
MAX3221E
MAX3223E
MAX3243E
Selector Guide
NO. OF
V
CC
RANGE
DRIVERS/
(V)
RECEIVERS
1/1
2/2
3/5
3.0 to 5.5
3.0 to 5.5
3.0 to 5.5
AUTOSHUTDOWN
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
AutoShutdown is a trademark of Maxim Integrated Products.
†
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.
________________________________________________________________
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.
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
MAX3221E/MAX3223E/MAX3243E
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
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,
EN,
FORCEON,
FORCEOFF
to GND ............-0.3V to +6V
R_IN to GND ......................................................................±25V
Output Voltages
T_OUT to GND................................................................±13.2V
R_OUT, R2OUTB,
INVALID
to GND .........-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration
T_OUT to GND .........................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
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 12.50mW/°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
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
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
FORCEON = GND,
FORCEOFF
= V
CC,
all R_IN open
FORCEOFF
= GND
FORCEON =
FORCEOFF
= V
CC
,
no load
T_IN,
EN,
FORCEON,
FORCEOFF
T_IN,
EN,
FORCEON,
FORCEOFF
V
CC
= 3.3V
V
CC
= 5.0V
2.0
2.4
0.5
T_IN,
EN,
FORCEON,
FORCEOFF
R_OUT receivers disabled
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Positive threshold
Negative threshold
-2.7
-0.3
0.3
0.4
V
CC
- 0.6
V
CC
- 0.6
V
CC
- 0.1
2.7
±0.01
±0.05
±1
±10
0.4
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
(V
CC
= 3.3V or 5.0V, T
A
= +25°C)
Supply Current, AutoShutdown
Supply Current, Shutdown
Supply Current,
AutoShutdown Disabled
LOGIC INPUTS
Input Logic Threshold Low
Input Logic Threshold High
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Current
Output Voltage Low
Output Voltage High
µA
V
V
0.8
V
V
V
µA
1.0
1.0
0.3
10
10
1
µA
µA
mA
AUTOSHUTDOWN (FORCEON
= GND,
FORCEOFF
= V
CC
)
Receiver Input Threshold to
INVALID
Output High
Receiver Input Threshold to
INVALID
Output Low
INVALID
Output Voltage Low
INVALID
Output Voltage High
Figure 5a
Figure 5a
I
OUT
= 1.6mA
I
OUT
= -1.0mA
V
V
V
V
2
_______________________________________________________________________________________
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Receiver Positive or Negative
Threshold to
INVALID
High
Receiver Positive or Negative
Threshold to
INVALID
Low
Receiver or Transmitter Edge to
Transmitters Enabled
RECEIVER INPUTS
Input Voltage Range
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
MOUSE DRIVEABILITY (MAX3243E)
T1IN = T2IN = GND, T3IN = V
CC
,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with
2.5mA each
IEC 1000-4-2 Air-Gap Discharge
R_IN, T_OUT
IEC 1000-4-2 Contact Discharge
Human Body Model
V
OUT
= ±12V, V
CC
= 0 or 3V to
5.5V, transmitters disabled
All transmitter outputs loaded with
3kΩ to ground
V
CC
= V+ = V- = 0, T
OUT
= ±2V
±5
300
±5.4
10M
±60
±25
V
Ω
mA
µA
3
T
A
= +25°C
T
A
= +25°C
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
SYMBOL
t
INVH
t
INVL
t
WU
CONDITIONS
V
CC
= 5V, Figure 5b
V
CC
= 5V, Figure 5b
V
CC
= 5V, Figure 5b
-25
-25
0.6
0.8
1.2
1.5
1.5
1.8
0.5
5
7
2.4
2.4
MIN
TYP
1
30
100
25
25
MAX
UNITS
µs
µs
µs
V
V
V
V
V
kΩ
MAX3221E/MAX3223E/MAX3243E
Transmitter Output Voltage
±5.0
V
ESD PROTECTION
±15
±8
±15
kV
kV
_______________________________________________________________________________________
3
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
MAX3221E/MAX3223E/MAX3243E
TIMING CHARACTERISTICS—MAX3221E/MAX3223E/MAX3243E
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
t
PHL
- t
PLH
t
PHL
- t
PLH
t
PHL
t
PLH
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
C
L
= 150pF
Normal operation
Normal operation
(Note 3)
V
CC
= 3.3V,
R
L
= 3kΩ to 7kΩ,
T
A
= +25°C,
measured from
+3V to -3V or
-3V to +3V
MIN
250
0.15
0.15
200
200
100
50
C
L
= 150pF to
1000pF
C
L
= 150pF to
2500pF
6
30
V/µs
4
30
TYP
MAX
UNITS
kbps
µs
ns
ns
ns
ns
Transition-Region Slew Rate
Note 2:
C1–C4 = 0.1µF, tested at 3.3V ±10%. C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%.
Note 3:
Transmitter skew is measured at the transmitter zero cross points.
Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3221E/MAX3223E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
MAX3221E-01
MAX3221E/MAX3223E
SLEW RATE vs. LOAD CAPACITANCE
14
12
SLEW RATE (V/µs)
MAX3221-TOC2
16
V
OUT+
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
10
8
6
4
+SLEW
-SLEW
V
OUT-
1000
2000
3000
4000
5000
2
FOR DATA RATES UP TO 250kbps
0
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
MAX3221E/MAX3223E/MAX3243E
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3221E/MAX3223E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V)
40
SUPPLY CURRENT (mA)
35
30
25
20
15
10
5
0
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
20kbps
250kbps
120kbps
MAX3224E-03
MAX3243E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
V
OUT+
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
MAX3224E-04
45
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
1000
2000
3000
V
OUT-
4000
5000
LOAD CAPACITANCE (pF)
MAX3243E
SLEW RATE vs. LOAD CAPACITANCE
MAX3243E-05
MAX3243E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3243E-06
14
12
SLEW RATE (V/µs)
10
8
6
4
2
0
0
1000
2000
3000
4000
60
50
SUPPLY CURRENT (mA)
250kbps
40
30
20kbps
20
10
0
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
0
1000
2000
3000
4000
120kbps
5000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
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