54AC16652, 74AC16652
16-BIT BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCAS242A – MARCH 1990 – REVISED APRIL 1996
54AC16652 . . . WD PACKAGE
74AC16652 . . . DL PACKAGE
(TOP VIEW)
Members of the Texas Instruments
Widebus Family
Independent Registers and Enables for A
and B Buses
1
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
1OEAB
1CLKAB
1SAB
GND
1OEBA
1CLKBA
1SBA
GND
Multiplexed Real-Time and Stored Data
2
3
Flow-Through Architecture Optimizes
PCB Layout
4
5
1A1
1B1
Distributed V
and GND Pin
CC
6
1A2
1B2
Configurations Minimize High-Speed
Switching Noise
7
V
V
CC
CC
8
1A3
1A4
1A5
GND
1A6
1A7
1A8
2A1
2A2
2A3
GND
2A4
2A5
2A6
1B3
1B4
1B5
GND
1B6
1B7
1B8
2B1
2B2
2B3
GND
2B4
2B5
2B6
EPIC (Enhanced-Performance Implanted
CMOS) 1-µm Process
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
500-mA Typical Latch-Up Immunity at
125°C
Package Options Include Plastic 300-mil
Shrink Small-Outline (DL) Packages Using
25-mil Center-to-Center Pin Spacings and
380-mil Fine-Pitch Ceramic Flat (WD)
Packages Using 25-mil Center-to-Center
Pin Spacings
description
The ’AC16652 are 16-bit bus transceivers that
consist of D-type flip-flops and control circuitry
arranged for multiplexed transmission of data
directly from the data bus or from the internal
storage registers. They can be used as two 8-bit
transceivers or one 16-bit transceiver.
V
V
CC
CC
2A7
2A8
GND
2SAB
2B7
2B8
GND
2SBA
2CLKBA
2OEBA
2CLKAB
2OEAB
Complementary output-enable (OEAB and
OEBA) inputs are provided to control the
transceiver functions. 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. The circuitry used for select
control eliminates the typical decoding glitch that
occurs in a multiplexer during the transition
between stored and real-time data. Figure 1
illustrates the four fundamental bus-management
functions that can be performed with the
’AC16652.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
Copyright 1996, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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