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MC74LVXC3245DT

Configurable Dual Supply Octal Transceiver with 3−State Outputs for 3 V Systems

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Advance Information

Configurable Dual Supply

Octal Transceiver

with 3-State Outputs for 3V Systems

The 74LVXC3245 is a 24–pin dual–supply, octal configurable voltage

interface transceiver especially well suited for PCMCIA and other real

time configurable I/O applications. The VCCA pin accepts a 3V supply

level; the A port is a dedicated 3V port. The VCCB pin accepts a 3V–to–5V

supply level. The B port is configured to track the VCCB supply level. A 5V

level on the VCCB pin will configure the I/O pins at a 5V level and a 3V

VCCB will configure the I/O pins at a 3V level. The A port interfaces with a

3V host system and the B port to the card slots. This device will allow the

VCCB voltage source pin and I/O pins on the B port to float when OE is

High. This feature is necessary to buffer data to and from a PCMCIA

socket that permits PCMCIA cards to be inserted and removed during

normal operation. The Transmit/Receive (T/R) input determines the

direction of data flow. Transmit (active–High) enables data from the A port

to B port. Receive (active–Low) enables data from the B port to the A port.

• Bidirectional Interface Between 3V and 3V/5V Buses

• Control Inputs Compatible with TTL Level

• Outputs Source/Sink Up to 24mA

• Guaranteed Simultaneous Switching Noise Level and Dynamic

Threshold Performance

• Available in SOIC and TSSOP Packages

• Flexible VCCB Operating Range

• Allows B Port and VCCB to Float Simultaneously When OE Is High

• Functionally Compatible with the 74 Series 245

MC74LVXC3245

LVX

LOW–VOLTAGE CMOS

DW SUFFIX

24–LEAD PLASTIC WIDE SOIC PACKAGE

CASE 751E–04

DT SUFFIX

24–LEAD PLASTIC TSSOP PACKAGE

CASE 948H–01

VCCB NC OE B0 B1 B2 B3 B4 B5 B6 B7 GND

24 23 22 21 20 19 18 17 16 15 14 13

1 2 3 4 5 6 7 8 9 10 11 12

VCCA T/R A0 A1 A2 A3 A4 A5 A6 A7 GND GND

Figure 1. 24–Lead Pinout (Top View)

PIN NAMES

Pins

Function

OE

T/R

A0–A7

B0–B7

Output Enable Input

Transmit/Receive Input

Side A 3–State Inputs or 3–State

Outputs

Side B 3–State Inputs or 3–State

Outputs

This document contains information on a new product. Specifications and information herein are subject to

change without notice.

7/97

© Motorola, Inc. 1997

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