ꢀꢁꢂ ꢃ ꢄ ꢅꢆ ꢇꢈ ꢉꢊꢊ
ꢉ ꢋꢄꢌ ꢆꢍ ꢆꢎ ꢍꢈ ꢋꢄꢌ ꢆ ꢍꢏꢐꢑꢌ ꢆ ꢒꢍꢄ ꢓꢀꢍ ꢆꢑꢐ ꢁꢀ ꢅ ꢔꢌ ꢕ ꢔꢑ
ꢖ
SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993
DW OR NT PACKAGE
(TOP VIEW)
• BiCMOS Process With TTL Inputs and
Outputs
• BiCMOS Design Reduces Standby Current
OEA
A1
V
CC
B1
1
24
23
22
21
20
19
18
17
16
15
14
• Flow-Through Pinout (All Inputs on
2
A2
B2
Opposite Side From Outputs)
3
A3
B3
4
• Functionally Equivalent to SN74ALS29833
A4
B4
5
and AMD Am29833
A5
B5
6
• High-Speed Bus Transceiver With Parity
A6
B6
7
Generator/Checker
A7
B7
8
• Parity-Error Flag With Open-Collector
A8
B8
9
Output
ERR
CLR
PARITY
OEB
10
11
• Available Register For Storage of the
Parity-Error Flag
GND 12
13 CLK
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
description
The SN74BCT29833 is an 8-bit to 9-bit parity transceiver designed for asynchronous communication between
data buses. When data is transmitted from the A to B bus, a parity bit is generated. When data is transmitted
from the B to A bus with its corresponding parity bit, the parity-error (ERR) output will indicate whether or not
an error in the B data has occurred. The output-enable (OEA, OEB) inputs can be used to disable the device
so that the buses are effectively isolated.
A 9-bit parity generator/checker generates a parity-odd (PARITY) output and monitors the parity of the I/O ports
with an open-collector parity-error (ERR) flag. ERR is clocked into the register on the rising edge of the CLK
input. The error flag register is cleared with a low pulse on the clear (CLR) input. 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 which gives the designer more system diagnostic capability. The SN74BCT29833 provides true
logic.
The SN74BCT29833 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
CLK
OUTPUT AND I/O
†
Bi
∑ of H’s
FUNCTION
Ai
∑ of H’s
‡
OEB
OEA
CLR
A
B
PARITY
ERR
Odd
Even
L
H
L
H
X
X
NA
NA
A
NA
A data to B bus and generate parity
Odd
Even
H
L
H
X
L
H
L
↑
NA
B
X
NA
NA
NA
NA
B data to A bus and check parity
Clear error-flag register
X
X
X
X
H
H
L
H
H
No↑
No↑
↑
X
X
Odd
Even
NC
H
H
§
Isolation
H
L
H
L
X
Z
Z
A
Z
↑
L
Odd
Even
H
L
A data to B bus and generate inverted
parity
X
X
NA
NA
NA
NA = not applicable, NC = no change, X = don’t care
†
‡
§
Summation of high-level inputs includes PARITY along with Bi inputs.
Output states shown assume the ERR output was previously high.
In this mode, the ERR output, when enabled, shows inverted parity of the A bus.
ꢏ
ꢏ
ꢑ
ꢎ
ꢧ
ꢗ
ꢢ
ꢓ
ꢅ
ꢠ
ꢆ
ꢡ
ꢌ
ꢛ
ꢎ
ꢙ
ꢁ
ꢚ
ꢗ
ꢐ
ꢆ
ꢐ
ꢘ
ꢙ
ꢣ
ꢚ
ꢛ
ꢡ
ꢜ
ꢝ
ꢞ
ꢞ
ꢟ
ꢟ
ꢘ
ꢘ
ꢛ
ꢛ
ꢙ
ꢙ
ꢘ
ꢠ
ꢠ
ꢤ
ꢡ
ꢢ
ꢜ
ꢜ
ꢣ
ꢣ
ꢙ
ꢟ
ꢞ
ꢝ
ꢠ
ꢠ
ꢛ
ꢚ
ꢤ
ꢆꢣ
ꢢ
ꢥ
ꢠ
ꢦ
ꢘ
ꢡ
ꢞ
ꢠ
ꢟ
ꢘ
ꢟ
ꢛ
ꢜ
ꢙ
ꢢ
ꢧ
ꢞ
ꢙ
ꢟ
ꢟ
ꢣ
ꢠ
ꢨ
Copyright 1993, Texas Instruments Incorporated
ꢜ
ꢛ
ꢡ
ꢟ
ꢛ
ꢜ
ꢝ
ꢟ
ꢛ
ꢠ
ꢤ
ꢘ
ꢚ
ꢘ
ꢡ
ꢣ
ꢜ
ꢟ
ꢩ
ꢟ
ꢣ
ꢜ
ꢛ
ꢚ
ꢪ
ꢞ
ꢌ
ꢙ
ꢝ
ꢣ
ꢠ
ꢟ
ꢞ
ꢙ
ꢧ
ꢞ
ꢜ
ꢧ
ꢫ
ꢞ
ꢟ ꢣ ꢠ ꢟꢘ ꢙꢭ ꢛꢚ ꢞ ꢦꢦ ꢤꢞ ꢜ ꢞ ꢝ ꢣ ꢟ ꢣ ꢜ ꢠ ꢨ
ꢜ
ꢜ
ꢞ
ꢙ
ꢟ
ꢬ
ꢨ
ꢏ
ꢜ
ꢛ
ꢧ
ꢢ
ꢡ
ꢟ
ꢘ
ꢛ
ꢙ
ꢤ
ꢜ
ꢛ
ꢡ
ꢣ
ꢠ
ꢠ
ꢘ
ꢙ
ꢭ
ꢧ
ꢛ
ꢣ
ꢠ
ꢙ
ꢛ
ꢟ
ꢙ
ꢣ
ꢡ
ꢣ
ꢠ
ꢠ
ꢞ
ꢜ
ꢘ
ꢦ
ꢬ
ꢘ
ꢙ
ꢡ
ꢦ
ꢢ
ꢧ
ꢣ
2−1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443