TRS3318E_10 Datasheet, PDF (1/19 Pages) Texas Instruments – 2.5-V 460-kbps RS-232 TRANSCEIVER WITH ±15-kV ESD PROTECTION

TRS3318E
www.ti.com
SLLS805A – APRIL 2007 – REVISED APRIL 2010
2.5-V 460-kbps RS-232 TRANSCEIVER
WITH ±15-kV ESD PROTECTION
Check for Samples: TRS3318E
FEATURES
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• ESD Protection for RS-232 I/O Pins
– ±15 kV (Human-Body Model)
– ±8 kV (IEC 61000-4-2, Contact Discharge)
– ±15 kV (IEC 61000-4-2, Air-Gap Discharge)
• 300-µA Operating Supply Current
• 1-µA Low-Power Standby Mode (With
Receivers Active)
• Designed to Transmit at a Data Rate of
460 kbps
• Auto-Powerdown Plus Option Features
Flexible Power-Saving Mode
• Operates From a Single 2.25-V to 3-V V_CC
Supply
• Designed to be Interchangeable With Industry
Standard '3318 Devices
DB OR PW PACKAGE
(TOP VIEW)
READY 1
C1+ 2
V+ 3
C1− 4
C2+ 5
C2− 6
V− 7
DOUT2 8
RIN2 9
ROUT2 10
20 FORCEOFF
19 V_CC
18 GND
17 DOUT1
16 RIN1
15 ROUT1
14 FORCEON
13 DIN1
12 DIN2
11 INVALID
APPLICATIONS
• Battery-Powered Systems
• PDAs
• Cellular Phones
• Notebooks
• Hand-Held Equipment
• Pagers
DESCRIPTION/ORDERING INFORMATION
The TRS3318E is a 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 ±15 kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8 kV
using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the Human-Body Model (HBM).
The device operates at a data rate of 460 kbps. The transceiver has a proprietary low-dropout driver output
stage, enabling RS-232-compatible operation from a 2.25-V to 3-V supply with a dual charge pump. The charge
pump requires only four 0.1-µF capacitors and features a logic-level output (READY) that asserts when the
charge pump is regulating and the device is ready to begin transmitting.
The TRS3318E achieves a 1-µA supply current using the auto-powerdown feature. This device automatically
enters a low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected
peripherals are inactive for more than 30 s. The device turns on again when it senses a 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.
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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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2010, Texas Instruments Incorporated