Texas Instruments TRS3318 2.5-V 460-kbps RS-232 Transceiver with ±15-kV ESD Protection

TRS3318

查询TRS3318IDB供应商

2.5-V 460-kbps RS-232 TRANSCEIVER

WITH ±15-k V ESD PROTECTION

www.ti.com

SLLS820–AUGUST

1FEATURES

DB OR PW PACKAGE

ESD Protection for RS-232 I/O Pins (TOP VIEW)

±15 k V Human-Body Model (HBM)

READY FORCEOFF

±8 k V IEC 61000-4-2, Contact Discharge

C1+ VCC

±8 k V IEC 61000-4-2, Air-Gap Discharge

V+ GND

300-μA Operating Supply Current

C1− DOUT1

1-μA Low-Power Standby (With Receivers

C2+ RIN1

Active) Mode

C2− ROUT1

Designed to Transmit at Data Rate of V− FORCEON

kbps DOUT2 DIN1

Auto-Powerdown Plus Option Features RIN2 DIN2

Flexible Power-Saving Mode ROUT2 INVALID

Operates From Single 2.25-V to 3-V VCC

Supply

APPLICATIONS

Battery-Powered Systems

Cellular Phones

Notebooks

Hand-Held Equipment

Pagers

DESCRIPTION/ORDERING INFORMATION

The TRS3318 is dual-driver, dual-receiver, RS-232 compatible transceiver. The device features

auto-powerdown plus and enhanced electrostatic discharge (ESD) protection integrated into the chip. Driver

output and receiver input are protected to ±8 k V using the IEC 61000-4-2 Air-Gap Discharge method, ±8 k V

using the IEC 61000-4-2 Contact Discharge method, and ±15 k V using the Human-Body Model (HBM).

The device operates at data rate of kbps. The transceiver has proprietary low-dropout driver output stage

enabling RS-232-compatible operation from 2.25-V to 3-V supply with dual charge pump. The charge pump

requires only four 0.1-μF capacitors and features logic-level output (READY) that asserts when the charge

pump is regulating and the device is ready to begin transmitting.

The TRS3318 achieves 1-μA supply current using the auto-powerdown feature. This device automatically

enters low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected

peripherals are inactive for more than s. The device turns on again when it senses valid transition at any

driver or receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system.

This device is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.

Flexible control options for power management are featured when the serial port and driver inputs are inactive.

The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of

operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately

s, the built-in charge pump and drivers are powered down, reducing the supply current to μA. By

disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus can be disabled when

FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically

when valid signal is applied to any receiver or driver input. INVALID is high (valid data) if any receiver input

voltage is greater than 2.7 or less than –2.7 V, or has been between –0.3 and 0.3 for less than μs

(typical number). INVALID is low (invalid data) if all receiver input voltage are between –0.3 and 0.3 for more

than μs (typical number).

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.

PRODUCTION DATA information is current as of publication date.

Copyright 2007, Texas Instruments Incorporated Products

conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.