November 1996 74LCX2245 Low-Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs General Description Features The LCX2245 contains eight non-inverting bidirectional buffers with TRI-STATEÉ outputs and is intended for bus oriented applications. The device is designed for low voltage (3.3V) VCC applications with capability of interfacing to a 5V signal environment. The T/R input determines the direction of data flow through the device. The OE input disables both the A and B ports by placing them in a high impedance state. The 25X-series resistor helps reducing output overshoot and undershoot. The LCX2245 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. Y Y Y Y Y Y Y Y Y Y Y 5V tolerant inputs and outputs 10 mA ICCQ max Power down high impedance inputs and outputs 25X-series resistor on outputs Supports live insertion/withdrawal 2.0V – 3.6V VCC supply operation g 12 mA output drive Implements patented Quiet SeriesTM noise/EMI reduction circuitry Functionally compatible with the 74 series 245 Latch-up performance exceeds 500 mA ESD performance: Human body model l 2000V Machine model l 200V Logic Symbols Connection Diagram Pin Assignment for SOIC, SSOP and TSSOP IEEE/IEC TL/F/12573–1 TL/F/12573 – 3 TL/F/12573 – 2 Pin Names OE T/R A 0 – A7 B 0 – B7 Description Output Enable Input Transmit/Receive Input Side A Inputs or TRI-STATE Outputs Side B Inputs or TRI-STATE Outputs TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. Quiet SeriesTM is a trademark of National Semiconductor Corporation. C1996 National Semiconductor Corporation TL/F/12573 RRD-B30M17/Printed in U. S. A. http://www.national.com 74LCX2245 Low-Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs ADVANCE INFORMATION 74LCX2245 Low-Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 Email: support @ nsc.com http://www.national.com 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Europe Fax: a49 (0) 180-530 85 86 Email: europe.support @ nsc.com Deutsch Tel: a49 (0) 180-530 85 85 English Tel: a49 (0) 180-532 78 32 Fran3ais Tel: a49 (0) 180-532 93 58 Italiano Tel: a49 (0) 180-534 16 80 National Semiconductor Southeast Asia Fax: (852) 2376 3901 Email: sea.support @ nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5620-7561 Fax: 81-3-5620-6179 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.