MC74LCX652 Datasheet, PDF (1/9 Pages) Motorola, Inc – LOW-VOLTAGE CMOS OCTAL TRANSCEIVER/ REGISTERED TRANSCEIVER WITH DUAL ENABLE

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Low-Voltage CMOS Octal
Transceiver/Registered
Transceiver With Dual Enable
With 5V-Tolerant Inputs and Outputs
(3-State, Non-Inverting)
The MC74LCX652 is a high performance, non–inverting octal
transceiver/registered transceiver operating from a 2.7 to 3.6V supply.
High impedance TTL compatible inputs significantly reduce current
loading to input drivers while TTL compatible outputs offer improved
switching noise performance. A VI specification of 5.5V allows
MC74LCX652 inputs to be safely driven from 5V devices. The
MC74LCX652 is suitable for memory address driving and all TTL level
bus oriented transceiver applications.
Data on the A or B bus will be clocked into the registers as the
appropriate clock pin goes from a LOW–to–HIGH logic level. Two Output
Enable pins (OEBA, OEAB) are provided to control the transceiver
outputs. In the transceiver mode, data present at the high impedance port
may be stored in either the A or the B register or in both. The select
controls (SBA, SAB) can multiplex stored and real–time (transparent
mode) data. In the isolation mode (both outputs disabled), A data may be
stored in the B register or B data may be stored in the A register. When in
the real–time mode, it is possible to store data without using the internal
registers by simultaneously enabling OEAB and OEBA. In this
configuration, each output reinforces its input (data retention is not
guaranteed in this mode).
• Designed for 2.7 to 3.6V VCC Operation
• 5V Tolerant — Interface Capability With 5V TTL Logic
• Supports Live Insertion and Withdrawal
• IOFF Specification Guarantees High Impedance When VCC = 0V
• LVTTL Compatible
• LVCMOS Compatible
• 24mA Balanced Output Sink and Source Capability
• Near Zero Static Supply Current in All Three Logic States (10µA)
Substantially Reduces System Power Requirements
• Latchup Performance Exceeds 500mA
• ESD Performance: Human Body Model >2000V; Machine Model >200V
VCC CBA SBA OEBA B0 B1 B2 B3 B4 B5 B6 B7
24 23 22 21 20 19 18 17 16 15 14 13
MC74LCX652
LOW–VOLTAGE CMOS
OCTAL TRANSCEIVER/
REGISTERED TRANSCEIVER
WITH DUAL ENABLE
DW SUFFIX
24–LEAD PLASTIC SOIC PACKAGE
CASE 751E–04
SD SUFFIX
24–LEAD PLASTIC SSOP PACKAGE
CASE 940D–03
DT SUFFIX
24–LEAD PLASTIC TSSOP PACKAGE
CASE 948H–01
PIN NAMES
Pins
A0–A7
B0–B7
CAB, CBA
SAB, SBA
OEBA, OEAB
Function
Side A Inputs/Outputs
Side B Inputs/Outputs
Clock Pulse Inputs
Select Control Inputs
Output Enable Inputs
1 2 3 4 5 6 7 8 9 10 11 12
CAB SAB OEAB A0 A1 A2 A3 A4 A5 A6 A7 GND
Figure 1. 24–Lead Pinout (Top View)
3/97
© Motorola, Inc. 1997
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