74AC11651_10 Datasheet, PDF (1/10 Pages) Texas Instruments – OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS

• Independent Registers and Enables for A
and B Buses
• Multiplexed Real-Time and Stored Data
• Inverting Data Paths
• Flow-Through Architecture Optimizes PCB
Layout
• Center-Pin V_CC and GND Configurations
Minimize High-Speed Switching Noise
• EPIC  (Enhanced-Performance Implanted
CMOS) 1-µm Process
• 500-mA Typical Latch-Up Immunity at
125°C
• Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
description
74AC11651
OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3ĆSTATE OUTPUTS
SCAS135 − MARCH 1990 − REVISED APRIL 1993
DW OR NT PACKAGE
(TOP VIEW)
OEAB 1
A1 2
A2 3
A3 4
A4 5
GND 6
GND 7
GND 8
GND 9
A5 10
A6 11
A7 12
A8 13
OEBA 14
28 CLKAB
27 SAB
26 B1
25 B2
24 B3
23 B4
22 V_CC
21 V_CC
20 B5
19 B6
18 B7
17 B8
16 CLKBA
15 SBA
These devices consist 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-enable (OEAB and
OEBA) inputs are provided to control the transceiver functions. The select-control (SAB and SBA) inputs are
provided to select whether real-time or stored data is transferred. A low input level selects real-time data, and
a high input level selects stored data. Figure 1 illustrates the four fundamental bus-management functions that
can be performed with the 74AC11651.
Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the
appropriate clock (CLKAB or CLKBA) inputs regardless of the select- or enable-control pins. When SAB and
SBA are in the real-time transfer mode, it is also possible to store data without using the internal D-type flip-flops
by simultaneously enabling OEAB and OEBA. In this configuration, each output reinforces its input. Thus, when
all the other data sources to the two sets of bus lines are at high impedance, each set will remain at its last state.
The 74AC11651 is characterized for operation from − 40°C to 85°C.
EPIC is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  1993, Texas Instruments Incorporated
1