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54ACT899 Datasheet

  • 54ACT899

  • 9-Bit Latchable Transceiver with Parity Generator/Checker

  • 12頁(yè)

  • NSC

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54ACT899 9-Bit Latchable Transceiver with Parity Generator/Checker
August 1998
54ACT899
9-Bit Latchable Transceiver with Parity
Generator/Checker
General Description
The ACT899 is a 9-bit to 9-bit parity transceiver with trans-
parent latches. The device can operate as a feed-through
transceiver or it can generate/check parity from the 8-bit data
busses in either direction. The ACT899 features independent
latch enables for the A-to-B direction and the B-to-A direc-
tion, a select pin for ODD/EVEN parity, and separate error
signal output pins for checking parity.
n
Independent latch enable for A-to-B and B-to-A
directions
n
Select pin for ODD/EVEN parity
n
ERRA and ERRB output pins for parity checking
n
Ability to simultaneously generate and check parity
n
May be used in system applications in place of the 鈥?80
n
May be used in system applications in place of the 鈥?57
and 鈥?73 (no need to change T/R to check parity)
n
4 kV minimum ESD immunity
n
Standard Microcircuit Drawing (SMD) 5962-9314101
Features
n
Latchable transceiver with output sink of 24 mA
n
Option to select generate parity and check or
鈥渇eed-through鈥?data/parity in directions A-to-B or B-to-A
Logic Symbol
Pin Names
A
0
鈥揂
7
B
0
鈥揃
7
APAR, BPAR
ODD/EVEN
GBA, GAB
SEL
Description
A Bus Data Inputs/Data Outputs
B Bus Data Inputs/Data Outputs
A and B Bus Parity Inputs
ODD/EVEN Parity Select, Active LOW
for EVEN Parity
Output Enables for A or B Bus, Active
LOW
Select Pin for Feed-Through or
Generate Mode, LOW for Generate
Mode
Latch Enables for A and B Latches,
HIGH for Transparent Mode
Error Signals for Checking Generated
Parity with Parity In, LOW if Error
Occurs
LEA, LEB
DS100245-1
Connection Diagram
Pin Assignment for LCC
ERRA, ERRB
DS100245-2
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
FACT
廬
is a registered trademark of Fairchild Semiconductor Corporation.
漏 1998 National Semiconductor Corporation
DS100245
www.national.com

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