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SN74BCT29854

更新时间： 2024-11-13 22:53:35
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德州仪器 - TI 总线收发器
页数 文件大小 规格书
7页 101K
描述
8-BIT TO 9-BIT PARITY BUS TRANSCEIVER

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SN74BCT29854 数据手册

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SN74BCT29854  
8-BIT TO 9-BIT PARITY BUS TRANSCEIVER  
SCBS257 – SEPTEMBER 1987 – REVISED NOVEMBER 1993  
DW OR NT PACKAGE  
(TOP VIEW)  
• BiCMOS Process With TTL Inputs and  
Outputs  
• State-of-the-Art BiCMOS Design  
OEA  
A1  
V
CC  
B1  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
Significantly Reduces Standby Current  
2
• Flow-Through Pinout (All Inputs on  
A2  
B2  
3
Opposite Side From Outputs)  
A3  
B3  
4
A4  
B4  
5
• Functionally Equivalent to AMD Am29854  
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  
• Latch for Storage of the Parity-Error Flag  
• Package Options Include Plastic  
Small-Outline (DW) Packages and Standard  
Plastic 300-mil DIPs (NT)  
GND 12  
13 LE  
description  
The SN74BCT29854 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 can be either passed, sampled, stored, or cleared from the  
latch using the latch-enable (LE) and clear (CLR) control inputs. 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 SN74BCT29854 provides inverting logic.  
The SN74BCT29854 is characterized for operation from 0°C to 70°C.  
FUNCTION TABLE  
INPUTS  
LE  
OUTPUT AND I/O  
†
Bi  
∑ of L’s  
FUNCTION  
Ai  
∑ of H’s  
‡
OEB  
L
OEA  
H
CLR  
X
A
NA  
B
B
A
PARITY  
ERR  
Odd  
Even  
H
L
X
L
NA  
NA  
A data to B bus and generate parity  
B data to A bus and check parity  
Odd  
Even  
H
L
H
L
X
NA  
NA  
NA  
H
X
L
H
L
H
H
NA  
X
X
X
X
X
NA  
NA  
NA  
NA  
N–1  
H
Store error flag  
X
Clear error-flag register  
H
L
X
X
H
H
L
X
X
NC  
H
L
§
Isolation  
H
L
H
L
X
Z
Z
A
Z
L Odd  
H Even  
L
H
Odd  
Even  
L
H
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 low-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 noninverted parity of the A bus.  
Copyright 1993, 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.  
2–1  
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567

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SN74BCT29854DW TI

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 		8-BIT TO 9-BIT PARITY BUS TRANSCEIVER
SN74BCT29854DW-00 TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24
SN74BCT29854DWE4 TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24
SN74BCT29854DWG4 TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24
SN74BCT29854DWR TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24
SN74BCT29854DWRE4 TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24
SN74BCT29854DWRG4 TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24
SN74BCT29854FN TI

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 		IC,BUS TRANSCEIVER,SINGLE,8-BIT,BICMOS-TTL,LDCC,28PIN,PLASTIC
SN74BCT29854NT TI

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 		8-BIT TO 9-BIT PARITY BUS TRANSCEIVER
SN74BCT29854NT-10 TI

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 		BCT/FBT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDIP24

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