Maxim MAX3243EEAI, MAX3243ECWI, MAX3223EEPP, MAX3223EEAP, MAX3223ECPP Datasheet

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 data­rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air­Gap 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 enter­ing 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 trans­mitter 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 capaci­tors for operation from a +3.3V supply. Each device is
guaranteed to run at data rates of 250kbps while main­taining 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 avail­able in space-saving SSOP packages.

Applications

Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers

Features

♦ 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
♦ 250kbps Guaranteed Data Rate
♦ 6V/µs Guaranteed Slew Rate
♦ Meets EIA/TIA-232 Specifications Down to 3.0V
♦ Smallest Single-Supply RS-232 Transceiver

(MAX3221E)

♦ Guaranteed Mouse Driveability (MAX3243E)
♦ Small 0.1µF Capacitors

MAX3221E/MAX3223E/MAX3243E

†

±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,

RS-232 Transceivers with AutoShutdown

________________________________________________________________

Maxim Integrated Products

1

19-1283; Rev 2; 1/98

PART

MAX3221ECAE

MAX3221EEAE -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 SSOP
16 SSOP

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.

Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.

MAX3223EEPP -40°C to +85°C 20 Plastic DIP
MAX3223EEAP -40°C to +85°C 20 SSOP
MAX3243ECWI

0°C to +70°C 28 Wide SO
MAX3243ECAI 0°C to +70°C 28 SSOP
MAX3243EEWI -40°C to +85°C 28 Wide SO
MAX3243EEAI -40°C to +85°C 28 SSOP

MAX3223ECPP
MAX3223ECAP 0°C to +70°C

0°C to +70°C 20 Plastic DIP

20 SSOP

Ordering Information

Selector Guide

MAX3221E
MAX3223E
MAX3243E

1/1
2/2

3.0 to 5.5

3.0 to 5.5

3.0 to 5.53/5

✔
✔
✔

PART

NO. OF

DRIVERS/

RECEIVERS

VCCRANGE

(V)

AUTOSHUTDOWN

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

MAX3221E/MAX3223E/MAX3243E

±15kV ESD-Pr otected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

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.

VCCto 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.

VCC= 5.0V

RECEIVER OUTPUTS

AUTOSHUTDOWN (FORCEON = GND, FORCEOFF = VCC)

LOGIC INPUTS

DC CHARACTERISTICS (VCC= 3.3V or 5.0V, TA= +25°C)

R_OUT receivers disabledOutput Leakage Current ±0.05 ±10 µA

Negative threshold

Positive threshold

Figure 5a

VCC= 3.3V

T_IN, EN, FORCEON,

FORCEOFF

CONDITIONS

I

OUT

= -1.0mA

I

OUT

= 1.6mA

Figure 5a

I

OUT

= -1.0mA

I

OUT

= 1.6mA

T_IN, EN, FORCEON, FORCEOFF

FORCEON = FORCEOFF = VCC,
no load

FORCEOFF = GND

FORCEON = GND,
FORCEOFF = V

CC,

all R_IN open

VCC- 0.6 V

INVALID Output Voltage High

-0.3 0.3 V

Receiver Input Threshold to
INVALID Output Low

0.4 V

INVALID Output Voltage Low

-2.7

V

Receiver Input Threshold to
INVALID Output High

2.7

0.3 1 mA

Supply Current,
AutoShutdown Disabled

1.0 10 µASupply Current, Shutdown

Supply Current, AutoShutdown

2.0

PARAMETER MIN TYP MAX UNITS

Input Logic Threshold Low 0.8 V

1.0 10 µA

Input Logic Threshold High

2.4

V

Output Voltage Low 0.4 V
Output Voltage High VCC- 0.6 VCC- 0.1 V

SYMBOL

Transmitter Input Hysteresis 0.5 V

T_IN, EN, FORCEON, FORCEOFF

Input Leakage Current ±0.01 ±1 µA

kV

MAX3221E/MAX3223E/MAX3243E

±15kV ESD-Pr otected, 1µA, 3.0V to 5.5V, 250kbps,

RS-232 Transceivers with AutoShutdown

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

PARAMETER MIN TYP MAX UNITS

±25

Output Short-Circuit Current ±60 mA

Output Resistance 300 10M Ω

Output Leakage Current µA

Input Threshold Low

0.6 1.2
V

±5 ±5.4Output Voltage Swing V

CONDITIONS

VCC= V+ = V- = 0, T

OUT

= ±2V

V

OUT

= ±12V, VCC= 0 or 3V to

5.5V, transmitters disabled

All transmitter outputs loaded with
3kΩ to ground

Receiver Positive or Negative
Threshold to INVALID High

1 µsVCC= 5V, Figure 5b

Input Hysteresis 0.5 V

Input Threshold High V

Input Resistance 3 5 7 kΩ

0.8 1.5

1.8 2.4

1.5 2.4

TA= +25°C

TA= +25°C

±5.0Transmitter Output Voltage V

T1IN = T2IN = GND, T3IN = VCC,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with

2.5mA each

t

INVH

SYMBOL

VCC= 3.3V
VCC= 5.0V
VCC= 3.3V
VCC= 5.0V

±15IEC 1000-4-2 Air-Gap Discharge

Receiver Positive or Negative
Threshold to INVALID Low

30 µsVCC= 5V, Figure 5bt

INVL

Input Voltage Range -25 25 V

Receiver or Transmitter Edge to
Transmitters Enabled

100 µsVCC= 5V, Figure 5bt

WU

Input Voltage Range -25 25 V

±8IEC 1000-4-2 Contact Discharge

R_IN, T_OUT

±15Human Body Model

kV

RECEIVER INPUTS

TRANSMITTER OUTPUTS

MOUSE DRIVEABILITY (MAX3243E)

ESD PROTECTION

Typical Operating Characteristics

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.)

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

0 1000 2000 3000 4000 5000

MAX3221E/MAX3223E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3221E-01

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

V

OUT+

T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps

V

OUT-

0

2

4

6

8

10

12

14

16

0 1000 2000 3000 4000 5000

MAX3221E/MAX3223E

SLEW RATE vs. LOAD CAPACITANCE

MAX3221-TOC2

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

-SLEW

+SLEW

FOR DATA RATES UP TO 250kbps

MAX3221E/MAX3223E/MAX3243E

±15kV ESD-Pr otected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS—MAX3221E/MAX3223E/MAX3243E

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

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.

t

PLH

RL= 3kΩ, CL= 1000pF,
one transmitter switching

t

PHL

SYMBOL



t

PHL

- t

PLH





t

PHL

- t

PLH



Receiver Output Disable Time ns

4 30

CONDITIONS

CL= 150pF to
2500pF

µs

0.15

Receiver Propagation Delay

CL= 150pF to
1000pF

kbps

UNITSMIN TYP MAXPARAMETER

(Note 3)

ns50Receiver Skew

ns100Transmitter Skew

VCC= 3.3V,
RL= 3kΩ to 7kΩ,
TA= +25°C,
measured from
+3V to -3V or

-3V to +3V

V/µsTransition-Region Slew Rate

6 30

CL= 150pF

250

0.15

Maximum Data Rate

nsNormal operationReceiver Output Enable Time

200Normal operation

200

MAX3221E/MAX3223E/MAX3243E

±15kV ESD-Pr otected, 1µA, 3.0V to 5.5V, 250kbps,

RS-232 Transceivers with AutoShutdown

_______________________________________________________________________________________

5

Typical Operating Characteristics (continued)

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA= +25°C, unless otherwise noted.)

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

0

MAX3243E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3224E-04

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

2000 30001000 4000 5000

1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps

V

OUT+

V

OUT-

0

4

2

8

6

12

10

14

0 1000 2000 3000 4000 5000

MAX3243E

SLEW RATE vs. LOAD CAPACITANCE

MAX3243E-05

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

0

30

20

10

40

50

60

0 20001000 3000 4000 5000

MAX3243E

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3243E-06

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

250kbps

120kbps

20kbps

T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps

0

5

10

15

20

25

30

35

40

45

0 20001000 3000 4000 5000

MAX3221E/MAX3223E

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3224E-03

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

250kbps

120kbps

20kbps

T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps