ON Semiconductort
Low−Voltage CMOS Octal
Transceiver/Registered
Transceiver With Dual
Enable
With 5 V−Tolerant Inputs and Outputs
(3−State, Non−Inverting)
The MC74LCX652 is a high performance, non−inverting octal
transceiver/registered transceiver operating from a 2.3 to 3.6 V 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 5.5 V allows
MC74LCX652 inputs to be safely driven from 5 V 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 2.3 to 3.6 V VCC Operation
• 5 V Tolerant − Interface Capability With 5 V TTL Logic
• Supports Live Insertion and Withdrawal
• IOFF Specification Guarantees High Impedance When VCC = 0 V
• LVTTL Compatible
• LVCMOS Compatible
• 24 mA Balanced Output Sink and Source Capability
• Near Zero Static Supply Current in All Three Logic States (10 μA)
Substantially Reduces System Power Requirements
• Latchup Performance Exceeds 500 mA
• ESD Performance: Human Body Model >2000 V; Machine Model
>200 V
MC74LCX652
LOW−VOLTAGE CMOS
OCTAL TRANSCEIVER/
REGISTERED TRANSCEIVER
WITH DUAL ENABLE
DT SUFFIX
24−LEAD PLASTIC TSSOP PACKAGE
CASE 948H
DW SUFFIX
24−LEAD PLASTIC SOIC PACKAGE
CASE 751E
Figure 1. PIN NAMES
Pins
Function
A0−A7
B0−B7
CAB, CBA
SAB, SBA
OEBA, OEAB
Side A Inputs/Outputs
Side B Inputs/Outputs
Clock Pulse Inputs
Select Control Inputs
Output Enable Inputs
© Semiconductor Components Industries, LLC, 2006
1
June, 2006 − Rev. 4
Publication Order Number:
MC74LCX652/D