Maxim MAX3235EEWP, MAX3235ECPP, MAX3233EEWP, MAX3233EEPP, MAX3233ECWP Datasheet

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________________General Description

The MAX3233E/MAX3235E are EIA/TIA-232 and V.28/V.24
communications interfaces with automatic shutdown/
wake-up 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 MAX3233E operates
from a +3.3V supply; the MAX3235E operates from +5.0V.

All devices achieve a 1µA supply current using Maxim’s
revolutionary AutoShutdown Plus™ feature. These
devices automatically enter a low-power shutdown
mode when the following two conditions occur: either
the RS-232 cable is disconnected or the transmitters of
the connected peripherals are inactive, and the UART
driving the transmitter inputs is inactive for more than
30 seconds. They turn on again when they sense a
valid transition at any transmitter or receiver input.
AutoShutdown Plus saves power without changes to
the existing BIOS or operating system.

The MAX3233E/MAX3235E have internal dual charge
pumps requiring no external capacitors. Both trans­ceivers have a proprietary low-dropout transmitter out­put stage that enables true RS-232 performance from a
+3.0V to +3.6V supply for the MAX3233E or a +4.5V to
+5.5V supply for the MAX3235E. These devices are
guaranteed to operate up to 250kbps. Both are avail­able in space-saving 20-pin wide SO or plastic DIP
packages.

________________________Applications

Subnotebook and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Embedded Systems

____________________________Features

♦ ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ Latchup Free
♦ 1µA Supply Current
♦ AutoShutdown Plus—1997 EDN Magazine

Innovation of the Year

♦ Single-Supply Operation

+3.0V to +3.6V (MAX3233E)
+4.5V to +5.5V (MAX3235E)

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

(MAX3233E)

♦ Internal Charge-Pump Capacitors

MAX3233E

†

/MAX3235E

†

±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual

RS-232 Transceivers with Internal Capacitors

________________________________________________________________

Maxim Integrated Products

1

19-1473; Rev 0; 4/99

PART

MAX3233ECWP

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 SO

AutoShutdown Plus is a trademark of Maxim Integrated Products.

_______________Ordering Information

Ordering Information continued at end of data sheet.

MAX3233E
MAX3235E

12

13

14

15

16

17

18

4

1

R2OUT R2IN

T2OUT

GND

V-

C2-

C2+

C1-

C1+

V+

V+

INVALID

T2IN

T1IN

FORCEON

R1OUT

T1OUT

R1IN

V

CC

FORCEOFF

2

9

10

5

6

7

8

3

19

20

11

CHARGE

PUMP

SO/DIP

Pin Configuration/

Functional Diagram

Typical Operating Circuit appears at end of data sheet.

MAX3233ECPP 0°C to +70°C 20 Plastic DIP

MAX3233EEPP -40°C to +85°C 20 Plastic DIP

MAX3233EEWP -40°C to +85°C 20 SO

†

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.

MAX3233E/MAX3235E

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V for MAX3233E, VCC= +4.5V to +5.5V for MAX3235E; TA= T

MIN

to T

MAX

; unless otherwise noted. Typical val-

ues are at T

A

= +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 (MAX3233E).........................................-0.3V to +4V

V

CC

to GND (MAX3235E).........................................-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, FORCEON,

FORCEOFF to GND....................-0.3V to +6V

R_IN to GND...................................................................±25V

Output Voltages

T_OUT to GND.............................................................±13.2V

R_OUT, 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)

Wide SO (derate 10mW/°C above +70°C)..................800mW

Plastic DIP (derate 11.11mW/°C above +70°C) .........889mW

Operating Temperature Ranges

MAX323_EC_P...................................................0°C to +70°C

MAX323_EE_P................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +150°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.

FORCEON = GND, FORCEOFF = VCC,
all R_IN idle, all T_IN idle

TA= +25°C

CONDITIONS

kΩ357Input Resistance

V0.5Input Hysteresis

1.8 2.4

V

1.5 2.4

Input Threshold High

0.8 1.3

V

0.6 1.0

Input Threshold Low

V-25 +25Input Voltage Range

V

VCC- 0.6 VCC- 0.1

Output Voltage High

V0.4Output Voltage Low

µA110Supply Current, Shutdown

µA110

Supply Current,
AutoShutdown Plus

µA±0.01 ±1

Transmitter Input Hysteresis V0.5

V

2.4

Input Logic Threshold High

mA0.3 1

Supply Current,
AutoShutdown Plus Disabled

V0.8Input Logic Threshold Low

2

UNITSMIN TYP MAXSYMBOLPARAMETER

FORCEOFF = GND

TA= +25°C

T_IN, FORCEON, FORCEOFF

FORCEON = FORCEOFF = VCC, no load

T_IN, FORCEON, FORCEOFF

I

OUT

= -1.0mA

I

OUT

= 1.6mA

Input Leakage Current

DC CHARACTERISTICS (VCC= 3.3V for MAX3233E, VCC= 5.0V for MAX3235E, TA= +25°C.)

LOGIC INPUTS AND RECEIVER OUTPUTS

RECEIVER INPUTS

TA= +25°C

VCC= 5.0V, MAX3235E

VCC= 3.3V, MAX3233E

VCC= 5.0V, MAX3235E

VCC= 3.3V, MAX3233E

±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors

T_IN, FORCEON,

FORCEOFF

VCC= 5.0V, MAX3235E

VCC= 3.3V, MAX3233E

MAX3233E/MAX3235E

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V for MAX3233E, VCC= +4.5V to +5.5V for MAX3235E; TA= T

MIN

to T

MAX

; unless otherwise noted. Typical val-

ues are at T

A

= +25°C.)

CONDITIONS

Ω300 10MOutput Resistance

V±5 ±5.4Output Voltage Swing

UNITSMIN TYP MAXSYMBOLPARAMETER

Figure 3a

sec15 30 60t

AUTOSHDN

Receiver or Transmitter Edge to
Transmitters Shut Down

µs100t

WU

Receiver or Transmitter Edge to
Transmitters Enabled

µs1t

INVH

Receiver Positive or Negative
Threshold to INVALID High

V

V

CC

- 0.6

INVALID, Output Voltage High

V0.4

INVALID Output Voltage Low

V-0.3 0.3

Receiver Input Threshold to
INVALID Output Low

-2.7

V

2.7

Receiver Input Threshold to
INVALID Output High

±15

±8R_IN, T_OUT kV

±15

µA

±25

Output Leakage Current

±60 mAOutput Short-Circuit Current

VCC= V+ = V- = 0, transmitter outputs = ±2V

All transmitter outputs loaded with 3kΩ to
ground

Figure 3b (Note 2)

Figure 3b (Note 2)

Figure 3b

I

OUT

= -1.0mA

I

OUT

= -1.6mA

Figure 3a

Human Body Model

V

OUT

= ± 12V
transmitters
disabled

IEC1000-4-2 Contact Discharge

IEC1000-4-2 Air Discharge

VCC= 0 or +4.5V to

5.5V (MAX3235E)

VCC= 0 or +3.0V to

3.6V (MAX3233E)

±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual

RS-232 Transceivers with Internal Capacitors

±25

MAX3233E
MAX3235E 50

µs

70

t

INVL

Receiver Positive or Negative
Threshold to INVALID Low

Figure 3b

TRANSMITTER OUTPUTS

ESD PROTECTION

AutoShutdown PLUS (FORCEON = GND, FORCEOFF = VCC)

Positive threshold
Negative threshold

ns

MAX3233E/MAX3235E

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V for MAX3233E, VCC= +4.5V to +5.5V for MAX3235E; TA= T

MIN

to T

MAX

; unless otherwise noted. Typical val-

ues are at T

A

= +25°C.)

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.

CL= 150pF
to 2500pF

CL= 150pF
to 1000pF

R_IN to R_OUT,
CL= 150pF

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

VCC= 3.3V (MAX3233E),
VCC= 5.0V (MAX3235E),
TA= +25°C,
RL= 3kΩ to 7kΩ,

measured from +3V to -3V
or -3V to +3V

Normal operation
Normal operation
(Note 3)

CONDITIONS

100

ns

70

t

PHL

kbps250Maximum Data Rate

Receiver Propagation Delay

V/µs

430

630

Transition-Region Slew Rate

ns200Receiver Output Enable Time
ns200Receiver Output Disable Time
ns150



t

PHL

- t

PLH



Transmitter Skew

ns

180



t

PHL

- t

PLH 

Receiver Skew

UNITSMIN TYP MAXSYMBOLPARAMETER

__________________________________________Typical Operating Characteristics

(VCC= +3.3V for MAX3233E, VCC= +5.0V for MAX3235E; 250kbps data rate; all transmitters loaded with 3kΩ and CL; TA= +25°C;
unless otherwise noted.)

±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors

150

250

t

PLH

MAX3233E
MAX3235E
MAX3233E
MAX3235E

50MAX3235E

MAX3233E

TRANSMITTER OUTPUT VOLTAGE vs.

LOAD CAPACITANCE

10.0

7.5

5.0

2.5
0

-2.5

-5.0

TRANSMITTER OUTPUT VOLTAGE (V)

-7.5

-10.0
0 1000 2000 3000 4000 5000

LOAD CAPACITANCE (pF)

+

V

OUT

-

V

OUT

MAX3233E/35Etoc01

SUPPLY CURRENT (mA)

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

45

TRANSMITTER 1 AT DATA RATE

40

TRANSMITTER 2 AT 1/16 DATA RATE
35
30
25
20
15
10

5
0

0 20001000 3000 4000 5000

250kbps

120kbps

20kbps

LOAD CAPACITANCE (pF)

MAX3233E/35E toc02

SLEW RATE (V/µs)

SLEW RATE vs.

LOAD CAPACITANCE

16
14
12
10

8
6
4
2
0

0 1000 2000 3000 4000 5000

LOAD CAPACITANCE (pF)

SLEW RATE -

SLEW RATE +

MAX3233E/35Etoc01