CD74HC652 Datasheet, PDF (2/12 Pages) Texas Instruments – High-Speed CMOS Logic Octal-Bus Transceiver/Registers, Three-State

CD74HC652, CD74HCT652
Description
The Harris CD74HC652 and CD74HCT652 three-state, octal-
bus transceiver/registers use silicon-gate CMOS technology
to achieve operating speeds similar to LSTTL with the low
power consumption of standard CMOS integrated circuits.
The CD74HC652 and CD74HCT652 have non-inverting
outputs. These devices consists of bus transceiver circuits, D-
type flip-flops, and control circuitry arranged for multiplexed
transmission of data directly from the data bus or from the
internal storage registers. Output Enables OE_AB and OE_BA
are provided to control the transceiver functions. SAB and
SBA control pins are provided to select whether real-time or
stored data is transferred. The circuitry used for select control
will eliminate the typical decoding glitch that occurs in a
multiplexer during the transition between stored and real-time
data. A LOW input level selects real-time data, and a HIGH
selects stored data. The following examples demonstrates the
four fundamentals bus-management functions that can be
performed with the octal-bus transceivers and registers.
Data on the A or B data bus, or both, can be stored in the
internal D flip-flops by low-to-high transitions at the appropriate
clock pins (CAB or CBA) regardless of the select of the control
pins. When SAB and SBA are in the real-time transfer mode, it
is also possible to store data without using the D-type flip-flops
by simultaneously enabling OE_AB and OE_BA. In this
configuration, each output reinforces its input. Thus, when all
other data sources to the two sets of bus lines are at high
impedance, each set of bus lines will remain at its last state.
Ordering Information
TEMP. RANGE
PART NUMBER
(^oC)
PACKAGE
PKG.
NO.
CD74HC652EN
-55 to 125 24 Ld PDIP
E24.3
CD74HCT652M
-55 to 125 24 Ld SOIC
M24.3
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
2