MAXIM MAX13234E, MAX13237E User Manual

General Description

The MAX13234E–MAX13237E are +3V to +5.5V pow­ered EIA/TIA-232 and V.28/V.24 communications inter­faces with high data-rate capabilities (up to 3Mbps), a
flexible logic voltage interface, and enhanced electro­static discharge (ESD) protection. All receiver inputs
and transmitter outputs are protected to ±15kV IEC
61000–4-2 Air Gap Discharge, ±8kV IEC 61000-4-2
Contact Discharge, and ±15kV Human Body Model.

The MAX13234E/MAX13235E have two receivers and
two transmitters, while the MAX13236E/MAX13237E
have a single receiver and transmitter. The transmitters
have a low-dropout transmitter output stage, delivering
true RS-232 performance from a +3V to +5.5V supply
based on a dual charge pump. The charge pump
requires only four small 0.1µF capacitors for operation
from a +3.3V supply.

All devices achieve a 1µA supply current using Maxim’s
AutoShutdown Plus™ feature. These devices automati­cally enter a low-power shutdown mode when the
RS-232 cable is disconnected or the devices driving
the transmitter and receiver inputs are inactive for more
than 30s.

The MAX13234E–MAX13237E are available in space­saving TQFN and TSSOP packages and operate over
the -40°C to +85°C extended temperature range.

Applications

Features

♦ Data Rate Up to 3Mbps

♦ Low-Voltage Logic Interface

♦ +3V to +5.5V Supply Voltage

♦ AutoShutdown Plus

♦ 1µA Shutdown Current

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

________________________________________________________________

Maxim Integrated Products

1

Ordering Information/Selector Guide

19-4343; Rev 0; 10/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART

DRIVERS/

RECEIVERS

MAXIMUM

DATA RATE

TEMP RANGE PIN-PACKAGE

MAX13234EEUP+ 2 x 2 250kbps -40°C to +85°C 20 TSSOP

MAX13234EETP+ 2 x 2 250kbps -40°C to +85°C 20 TQFN-EP*

MAX13235EEUP+ 2 x 2 3Mbps -40°C to +85°C 20 TSSOP

MAX13235EETP+ 2 x 2 3Mbps -40°C to +85°C 20 TQFN-EP*

MAX13236EETE+ 1 x 1 250kbps -40°C to +85°C 16 TQFN-EP*

MAX13237EETE+ 1 x 1 3Mbps -40°C to +85°C 16 TQFN-EP*

Telematics

GPS Systems

Industrial Systems

Portable Devices

Wireless Modules

POS Systems

Communication Systems

Data Cables

AutoShutdown Plus is a registered trademark of Maxim
Integrated Products, Inc.

Functional Diagrams continued at end of data sheet.

+

Denotes a lead-free/RoHS-compliant package.

*

EP = Exposed pad.

Functional Diagrams

1.62V to V

CC

C

BYPASS1

V

L

MAX13234E
MAX13235E

TION

LOGIC-LEVEL TRANSLA

GND

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

C1

C1+

C1-

C2+

C2

C2-

T1IN

T2IN

R1OUT

R2OUT

FORCEOFF

FORCEON

READY

3.0V to 5.5V

V

CC

C

BYPASS2

V+

V-

T1OUT

T2OUT

R1IN

5kΩ

R2IN

5kΩ

C3

C4

RS-232
OUTPUTS

RS-232
INPUTS

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with
Low-Voltage Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= +3V to +5.5V, VL= +1.62V to VCC, TA= -40°C to +85°C, C1–C4 = 0.1µF, VCC= VL, tested at 3.3V ±10%. Typical values are

at TA= +25°C.) (Note 2)

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.

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial

.

(All voltages referenced to GND.)
V

CC

...................................................................... -0.3V to +6.0V

V

L

......................................................................... -0.3V to +6.0V

V+ ........................................................................ -0.3V to +7.0V

V- ......................................................................... +0.3V to -7.0V

(V+) + |(V-)| ..................................................................... +13.0V

T_IN, FORCEOFF, FORCEON ..................... -0.3V to (V

L

+ 0.3V)

R_IN ................................................................................... ±25V

T_OUT.............................................................................. ±13.2V

R_OUT, READY ........................................... -0.3V to (V

L

+ 0.3V)
Short-Circuit Duration

T_OUT to GND ......................................................... Continuous

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TQFN (derate 20.8mW/°C above +70°C) ..... 1666mW

20-Pn TSSOP (derate 10.9mW/°C above +70°C) ...... 879mW

20-Pin TQFN (derate 21.3mW/°C above +70°C) ..... 1702mW

Junction-to-Case Thermal Resistance (θ

JC

) (Note 1)

16-Pin TQFN ................................................................. 2°C/W

20-Pin TSSOP ............................................................. 20°C/W

20-Pin TQFN ................................................................. 2°C/W

Junction-to-Ambient Thermal Resistance (θ

JA

) (Note 1)

16-Pin TQFN ............................................................... 30°C/W

20-Pin TSSOP ............................................................. 73°C/W

20-Pin TQFN ............................................................... 29°C/W

Operating Temperature Range

MAX1323x Operating Temperature Range .... -40°C to +85°C

MAX1323x Operating Temperature Range .. -40°C to +105°C

Storage Temperature Range ........................... -65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300

º

C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

Logic Supply Voltage V

VCC Supply Current I

VCC Shutdown Current I

VL Supply Current I

VL Shutdown Current I

LOGIC INPUTS (T_IN, FORCEON, FORCEOFF, Referred to VL)

Input Threshold Low V

Input Threshold High V

Input Hysteresis 60 mV

Input Leakage Current ±0.01 ±1 µA

RECEIVER OUTPUTS (READY)

Output-Voltage Low V

Output-Voltage High V

CC

L

CC

CCSH

L

LSH

IL

IH

OL

OH

FORCEOFF = FORCEON = VL, no loads 0.3 1 mA

VL = 0V 1 10
AutoShutDown Plus, FORCEOFF = VL,

FORCEON = GND, all R_IN idle, all T_IN
idle.

FORCEOFF = GND 1 10 µA

VCC = +5.5V 1 10 µA
FORCEOFF = GND 1 10 µA

Tested at room temperature only 1/3 x V

Tested at room temperature only 2/3 x V

I

= 0.8mA 0.4 V

OUT

I

= -0.5mA VL - 0.6 VL - 0.1 V

OUT

3 5.5 V

1.62 V

110

L

CC

L

V

µA

V

V

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +3V to +5.5V, VL= +1.62V to VCC, TA= -40°C to +85°C, C1–C4 = 0.1µF, VCC= VL, tested at 3.3V ±10%. Typical values are

at TA= +25°C.) (Note 2)

RECEIVER INPUTS

Input-Voltage Range - 25 +25 V

Input Threshold Low V

Input Threshold High V

Input Hysteresis 0.5 V

Input Resistance 357kΩ

TRANSMITTER OUTPUTS

Output-Voltage Swing

Output Resistance

Output Short-Circuit Current -60 +60 mA

Output Leakage Current

AutoShutdown Plus (FORCEON = GND, FORCEOFF = VL)

Receiver Input Threshold Valid
Level

Receiver Input Threshold
Invalid Level

Receiver or Transmitter Edge-to­Transmitters Enabled

Receiver or Transmitter Edge-to­Transmitters Shutdown

TIMING CHARACTERISTICS (MAX13234E/MAX13236E)

Maximum Data Rate

Receiver Propagation Delay

Transmitter Skew

Receiver Skew

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IL

IH

t

WU

t

AUTOSHDNVL

t

,

RPHL

t

RPLH

|t

-

TPHL

t

|

TPLH

|t

-

RPHL

t

|

RPLH

TA = +25°C

TA = +25°C

All transmitter outputs loaded with 3kΩ to
GND

V

= V+ = V- = 0V, transmitter outputs =

CC

±2V

V

= 0V or +3V to +5.5V, V

CC

transmitters disabled

Positive threshold, Figure 1 2.7 V

Negative threshold, Figure 1 -2.7 V

Figure 1 -0.3 +0.3 V

VL = 5V, Figure 1 (Note 3) 100 µs

= 5V, Figure 1 (Note 3) 15 30 60 s

R

= 3kΩ, CL = 1000pF, one transmitter

L

switching

CL = 150pF, Figures 2, 3 0.15 µs

Figures 4, 5 (Note 4) 100 ns

Figures 2, 3 50 ns

VCC = +3.3V 0.6 1.2

= +5V 0.8 1.5

V

CC

VCC = +3.3V 1.5 2.4

= +5V 1.8 2.4

V

CC

±5 ±5.4 V

300 10M Ω

= ±12V,

OUT

-25 +25 µA

250 kbps

V

V

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with
Low-Voltage Interface

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +3V to +5.5V, VL= +1.62V to VCC, TA= -40°C to +85°C, C1–C4 = 0.1µF, VCC= VL, tested at 3.3V ±10%. Typical values are

at TA= +25°C.) (Note 2)

Note 2: All devices are 100% production tested at TA= +85°C. All temperature limits are guaranteed by design.
Note 3: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input-logic thresholds.
Note 4: Transmitter skew is measured at the transmitter zero cross points.

Transition-Region Slew Rate

TIMING CHARACTERISTICS (MAX13235E/MAX13237E)

Maximum Data Rate

Receiver Propagation Delay

Transmitter Skew

Receiver Skew

Transition-Region Slew Rate

ESD PROTECTION

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= +3.3V, TA = +25°C, RL = 3kΩ to 7kΩ,

V

CC

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

t

RPHL

t

RPLH

|t

TPHL

t

TPLH

|t

RPHL

t

RPLH

one transmitter switching, C
1000pF

RL = 3kΩ, CL = 250pF, one transmitter
switching

= 3kΩ, CL = 150pF, one transmitter

R

L

switching

,

CL = 150pF, Figures 2, 3 0.15 µs

–

Figures 4, 5 (Note 4) 25 ns

|

–

Figures 2, 3 50 ns

|

= +3.3V, TA = +25°C, RL = 3kΩ to 7kΩ,

V

CC

measured from T
to +3V, one transmitter switching, C
150pF to 1000pF

Human Body Model ±15

IEC 61000-4-2 Air Discharge ±15R_IN, T_OUT to GND

IEC 61000-4-2 Contact Discharge ±8

_OUT

= 150pF to

L

= +3V to -3V or -3V

6 30 V/µs

1

Mbps

3

=

L

24 150 V/µs

kV

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

_______________________________________________________________________________________ 5

Test Circuits/Timing Diagram

Figure 1. AutoShutdown Plus, and READY Timing Diagram

Figure 2. Receiver Test Circuit

RECEIVER

INPUTS

TRANSMITTER

INPUTS

TRANSMITTER

OUTPUTS

t

AUTOSHDN

READY

V+

V-

V

CC

0

V+

V

CC

0

V-

t

t

WU

AUTOSHDN

t

WU

T_OUT R_OUTR_INT_IN

C

L