Rainbow Electronics 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

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.

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

BYPASS1

N IO

T A L S N

RA T

L E V E

-L IC

G O L

MAX13234E MAX13235E

GND

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

C1+

C1-

C2+

C2-

T1IN

T2IN

R1OUT

R2OUT

FORCEOFF

FORCEON

READY

3.0V to 5.5V

BYPASS2

V+

V-

T1OUT

T2OUT

R1IN

5kΩ

R2IN

5kΩ

RS-232 OUTPUTS

RS-232 INPUTS

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with Low-Voltage Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +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

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

......................................................................... -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

+ 0.3V)

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

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

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

+ 0.3V) Short-Circuit Duration

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

Continuous Power Dissipation (T

= +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

) (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

) (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

PARAMETER

CONDITIONS

Supply Voltage V

35.5V

Logic Supply Voltage V

FORCEOFF = FORCEON = VL, no loads 0.3 1 mA

VL = 0V 1 10

VCC Supply Current I

AutoShutDown Plus, FORCEOFF = VL, FORCEON = GND, all R_IN idle, all T_IN idle.

110

µA

VCC Shutdown Current I

CCSH

FORCEOFF = GND 1 10 µA

VL Supply Current I

VCC = +5.5V 1 10 µA

VL Shutdown Current I

LSH

FORCEOFF = GND 1 10 µA

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

Input Threshold Low V

Tested at room temperature only

Input Threshold High V

Tested at room temperature only

Input Hysteresis 60 mV

Input Leakage Current

±1 µA

RECEIVER OUTPUTS (READY)

Output-Voltage Low V

OUT

= 0.8mA 0.4 V

Output-Voltage High V

OUT

= -0.5mA

SYMBOL

MIN TYP MAX UNITS

1.62 V

2/3 x V

VL - 0.6 VL - 0.1

±0.01

1/3 x V

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +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)

PARAMETER

CONDITIONS

RECEIVER INPUTS

Input-Voltage Range - 25

VCC = +3.3V 0.6 1.2

Input Threshold Low V

TA = +25°C

= +5V 0.8 1.5

VCC = +3.3V 1.5 2.4

Input Threshold High V

TA = +25°C

= +5V 1.8 2.4

Input Hysteresis 0.5 V

Input Resistance 357k

TRANSMITTER OUTPUTS

Output-Voltage Swing

All transmitter outputs loaded with 3k

GND

±5

Output Resistance

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

±2V

Output Short-Circuit Current -60

Output Leakage Current

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

OUT

= ±12V,

transmitters disabled

-25

µA

AutoShutdown Plus (FORCEON = GND, FORCEOFF = VL)

Positive threshold, Figure 1 2.7 V

Receiver Input Threshold Valid Level

Negative threshold, Figure 1

Receiver Input Threshold Invalid Level

Figure 1

Receiver or Transmitter Edge-toTransmitters Enabled

VL = 5V, Figure 1 (Note 3)

µs

Receiver or Transmitter Edge-toTransmitters Shutdown

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

TIMING CHARACTERISTICS (MAX13234E/MAX13236E)

Maximum Data Rate

= 3kΩ, CL = 1000pF, one transmitter

switching

Receiver Propagation Delay

RPHL

RPLH

CL = 150pF, Figures 2, 3

µs

Transmitter Skew

TPHL

TPLH

Figures 4, 5 (Note 4)

Receiver Skew

RPHL

RPLH

Figures 2, 3 50 ns

SYMBOL

AUTOSHDN

MIN TYP MAX UNITS

300 10M

-2.7

-0.3 +0.3

250 kbps

±5.4

100

0.15

100

+25

+60

+25

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with Low-Voltage Interface

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= +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)

PARAMETER

CONDITIONS

Transition-Region Slew Rate

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

= 150pF to

1000pF

630V/µs

TIMING CHARACTERISTICS (MAX13235E/MAX13237E)

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

Maximum Data Rate

= 3kΩ, CL = 150pF, one transmitter

switching

Receiver Propagation Delay

RPHL

RPLH

CL = 150pF, Figures 2, 3

µs

Transmitter Skew

TPHL

–

TPLH

Figures 4, 5 (Note 4) 25 ns

Receiver Skew

RPHL

–

RPLH

Figures 2, 3 50 ns

Transition-Region Slew Rate

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

_OUT

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

to +3V, one transmitter switching, C

150pF to 1000pF

24 150 V/µs

ESD PROTECTION

Human Body Model

IEC 61000-4-2 Air Discharge

R_IN, T_OUT to GND

IEC 61000-4-2 Contact Discharge ±8

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.

SYMBOL

MIN TYP MAX UNITS

0.15

Mbps

±15

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

AUTOSHDN

READY

V+

V-

V+

V-

AUTOSHDN

T_OUT R_OUTR_INT_IN

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