SN75LPE185

LOW-POWER MULTIPLE RS-232 DRIVERS/RECEIVERS

WITH ENABLE

SLLS256D – DECEMBER 1996 – REVISED OCTOBER 1998

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POST OFFICE BOX 655303

Compatible Serial Port

(Equivalent to 256 kbit/s)

Controlled to 30-V/

µs Maximum

– 15 kV, Human-Body Model

– 8-kV IEC1000-4-2, Contact

– 15-kV IEC1000-4-2, Air Gap

Exceed the Requirements of TIA/EIA-232-F and

ITU v.28 Standards

Mode (100

µA Maximum)

Industry-Standard SN75185, SN75C185, and

SN75LP185, With Additional Control Pins

Small-Outline (DB), Small-Outline (DW), Thin

Shrink Small-Outline (PW), and Standard

Plastic (NT) DIPs

description

The SN75LPE185 is a low-power bipolar device containing three drivers and five receivers, with 15-kV ESD

protection on the bus pins, with respect to each other. Bus pins are defined as those pins that tie directly to the

serial-port connector, including GND. The pinout matches the flow-through design of the industry-standard

SN75185, SN75C185, and SN75LP185, with the addition of four pins for control signals. The flow-through

pinout of the device allows easy interconnection of the UART and serial-port connector of the IBM PC

compatibles. The SN75LPE185 provides a rugged, low-cost solution for this function with the combination of

bipolar processing and 15-kV ESD protection.

The SN75LPE185 has an internal slew-rate control to provide a maximum rate of change in the output signal

of 30 V/

µs. The driver output swing is clamped at ±6 V to enable the higher data rates associated with this device

and reduce EMI emissions. Although the driver outputs are clamped, the outputs can handle voltages up to

±15 V without damage.

The device has flexible control options for power management when the serial port is inactive. A common

disable for all of the drivers and receivers is provided with the active-low enable (EN) input. The mode control

(MODE) input selects between the STANDBY and WAKE-UP modes. With a low-level input on the MODE pin

and a high-level input on the EN pin, one receiver remains active while the remaining drivers and receivers are

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

RA1

RA2

RA3

DY1

DY2

RA4

DY3

RA5

EN

MODE

RY1

RY2

RY3

DA1

DA2

RY4

DA3

RY5

GND

NC

NC

DB, DW, NT, OR PW PACKAGE

(TOP VIEW)

NC – No internal connection

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PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright

© 1998, Texas Instruments Incorporated

IBM and PC are trademarks of International Business Machines Corporation.