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SCAS166A − JUNE 1990 − REVISED APRIL 1996
54ACT16833 . . . WD PACKAGE
74ACT16833 . . . DL PACKAGE
(TOP VIEW)
D
Members of the Texas Instruments
Widebus Family
Inputs Are TTL-Voltage Compatible
D
D
Parity Error Flag With Parity
Generator/Checker
1OEB
1CLK
1ERR
GND
1A1
1OEA
1CLR
1PARITY
GND
1
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
2
D
D
Register for Storage of the Parity Error Flag
3
4
Flow-Through Architecture Optimizes
PCB Layout
1B1
5
1A2
1B2
6
D
D
D
D
Distributed V
Minimizes High-Speed Switching Noise
and GND Pin Configuration
CC
V
V
7
CC
CC
1A3
1A4
1A5
GND
1A6
1A7
1A8
2A1
2A2
2A3
1B3
1B4
1B5
GND
1B6
1B7
1B8
2B1
2B2
2B3
8
EPIC (Enhanced-Performance Implanted
CMOS) 1-µm Process
500-mA Typical Latch-Up Immunity at
9
10
11
12
13
14
15
16
17
125°C
Package Options Include 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
GND 18
2A4 19
2A5 20
2A6 21
39 GND
38 2B4
37 2B5
36 2B6
description
The ’ACT16833 consist of two noninverting 8-bit
to 9-bit parity bus transceivers and are designed
for communication between data buses. For each
transceiver, when data is transmitted from the
A bus to the B bus, an odd-parity bit is generated
and output on the parity I/O pin (1PARITY or
2PARITY). When data is transmitted from the
B bus to the A bus, 1PARITY or 2PARITY is
configured as an input and combined with the
B-input data to generate an active-low error flag if
odd parity is not detected.
V
22
35
V
CC
CC
2A7 23
34 2B7
2A8 24
33 2B8
GND 25
2ERR 26
2CLK 27
32 GND
31 2PARITY
30 2CLR
28
29
2OEB
2OEA
The error (1ERR or 2ERR) output is configured as an open-collector output. The B-to-A parity error flag is
clocked into 1ERR or 2ERR on the low-to-high transition of the clock (1CLK or 2CLK) input. 1ERR or 2ERR is
cleared (set high) by taking the clear (1CLR or 2CLR) input low.
The output-enable (OEA and OEB) inputs can be used to disable the device so that the buses are effectively
isolated. When both OEA and OEB are low, data is transferred from the A bus to the B bus and inverted parity
is generated. Inverted parity is a forced error condition that gives the designer more system diagnostic
capability.
The 74ACT16833 is packaged in TI’s shrink small-outline package, which provides twice the I/O pin count and
functionality of standard small-outline packages in the same printed-circuit-board area.
The 54ACT16833 is characterized for operation over the full military temperature range of −55°C to 125°C. The
74ACT16833 is characterized for operation from −40°C to 85°C.
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
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1
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