19-4343; Rev 0; 10/08
3Mbps RS-232 Transceivers with
Low-Voltage Interface
4–MAX1237E
General Description
Features
The MAX13234E–MAX13237E are +3V to +5.5V pow-
ered EIA/TIA-232 and V.28/V.24 communications inter-
faces with high data-rate capabilities (up to 3Mbps), a
flexible logic voltage interface, and enhanced electro-
static discharge (ESD) protection. All receiver inputs
and transmitter outputs are protected to 15ꢀV IEꢁ
61000–4-2 Air Gap Discharge, 8ꢀV IEꢁ 61000-4-2
ꢁontact Discharge, and 15ꢀV ꢂuman ꢃodꢄ Model.
♦ Data Rate Up to 3Mbps
♦ Low-Voltage Logic Interface
♦ +3V to +5.5V Supply Voltage
♦ AutoShutdown Plus
♦ 1µA Shutdown Current
Functional Diagrams
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 supplꢄ
based on a dual charge pump. The charge pump
requires onlꢄ four small 0.1µF capacitors for operation
from a +3.3V supplꢄ.
1.62V to V
3.0V to 5.5V
CC
C
C
BYPASS2
BYPASS1
V
V
CC
L
C1+
V+
C1
C2
C3
C4
C1-
C2+
All devices achieve a 1µA supplꢄ current using Maxim’s
AutoShutdown Plus™ feature. These devices automati-
callꢄ 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.
MAX13234E
MAX13235E
V-
C2-
T1IN
T1OUT
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
T2OUT
R1IN
The MAX13234E–MAX13237E are available in space-
saving TQFN and TSSOP pacꢀages and operate over
the -40°ꢁ to +85°ꢁ extended temperature range.
R1OUT
5kΩ
RS-232
INPUTS
TTL/CMOS
OUTPUTS
Applications
R2OUT
R2IN
Telematics
Wireless Modules
POS Sꢄstems
FORCEOFF
FORCEON
READY
5kΩ
GPS Sꢄstems
Industrial Sꢄstems
Portable Devices
ꢁommunication Sꢄstems
Data ꢁables
GND
Functional Diagrams continued at end of data sheet.
AutoShutdown Plus is a registered trademarꢀ of Maxim
Integrated Products, Inc.
Ordering Information/Selector Guide
DRIVERS/
RECEIVERS
MAXIMUM
DATA RATE
PART
TEMP RANGE
PIN-PACKAGE
MAX13234EEUP+
MAX13234EETP+
MAX13235EEUP+
MAX13235EETP+
MAX13236EETE+
MAX13237EETE+
2 x 2
2 x 2
2 x 2
2 x 2
1 x 1
1 x 1
250ꢀbps
250ꢀbps
3Mbps
-40°ꢁ to +85°ꢁ
-40°ꢁ to +85°ꢁ
-40°ꢁ to +85°ꢁ
-40°ꢁ to +85°ꢁ
-40°ꢁ to +85°ꢁ
-40°ꢁ to +85°ꢁ
20 TSSOP
20 TQFN-EP*
20 TSSOP
3Mbps
20 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
250ꢀbps
3Mbps
+Denotes a lead-free/RoꢂS-compliant pacꢀage.
*EP = Exposed pad.
________________________________________________________________ Maxim Integrated Products
1
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.