MAX3323EEUE-T Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Multidrop Applications

19-2667; Rev 1; 1/03
±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications
General Description
The MAX3322E/MAX3323E 3.0V to 5.5V powered
EIA/TIA-232 and V.28/V.24 communications interfaces
are designed for multidrop applications with low power
requirements, high data-rate capabilities, and
enhanced electrostatic discharge (ESD) protection. All
RS-232 inputs and outputs are protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method,
±8kV using the IEC 1000-4-2 Contact Discharge
method, and ±15kV using the Human Body Model.
The MAX3322E/MAX3323E have pin-selectable
5kΩ/high-impedance RS-232 receivers. These devices
are capable of receiving data in high-impedance mode.
In multidrop applications, one receiver has a 5kΩ input
resistance, while the other receivers are high imped-
ance to ensure the RS-232 standard is observed. Logic
control permits selection of the functional mode: high
impedance or RS-232 standard load. The transmitters
are enabled by logic control to allow the multiplexing of
the inputs to a single UART.
A proprietary low-dropout transmitter output stage
enables 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. The MAX3322E/MAX3323E are
capable of running at data rates up to 250kbps while
maintaining RS-232-compliant output levels. The
MAX3322E/MAX3323E have a unique V_L pin that allows
operation in mixed-logic voltage systems. Both input
and output logic levels are pin programmable through
the V_L pin.
The MAX3322E is a 2Tx/2Rx device for hardware hand-
shaking in standard RS-232 mode, and the MAX3323E
is a 1Tx/1Rx, required in most multidrop applications.
The MAX3322E is offered in a space-saving TSSOP
package. The MAX3323E is offered in 16-pin DIP and
space-saving TSSOP packages.
Applications
Bar-Code Scanners
Video Security
Industrial Data Acquisition
Data Splitters
Features
o Pin-Selectable 5kΩ/High-Impedance Receivers
o Transmitter Outputs Three-Stated by Logic
Control
o V_L Pin for Compatibility with Mixed Voltage
Systems
o 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E)
Versions
o 250kbps Data Rate
o 1µA Low-Power Shutdown
o High 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
PART
MAX3322E EUP
MAX3323E EUE
MAX3323EEPE
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
16 TSSOP
16 DIP
Pin Configurations
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
TOUT2 7
RIN2 8
TOUT1 9
RIN1 10
MAX3322E
20 V_CC
19 GND
18 SHDN
17 V_L
16 RENABLE
15 TXENABLE
14 TIN2
13 ROUT2
12 TIN1
11 ROUT1
TSSOP
Typical Operating Circuit and Functional Diagram appear
at end of data sheet.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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