74abt834d NXP Semiconductors, 74abt834d Datasheet - Page 2

• Manufacturer Part Number: 74abt834d
• Description: Octal Inverting Transceiver With Parity Generator/checker 3-state
• Manufacturer: NXP Semiconductors

1. Error checking is detailed in the Error Flag Function Table below.
2. When clocked, the error output is Low if the sum of A inputs is even or High if the sum of A inputs is odd.
Philips Semiconductors Advanced BiCMOS Products
PIN DESCRIPTION
FUNCTION TABLE
NOTES:
ERROR FLAG FUNCTION TABLE
H
L
X
NA = Not applicable
NC = No change
Z
June 9, 1992
A data to B bus and generate odd parity
output
B data to A bus and check for parity error
A bus and B bus disabled
A data to B bus and generate inverted
parity output
Sample
Hold
Clear
Octal inverting transceiver with parity
generator/checker (3–State)
SYMBOL
= High voltage level steady state
= Low voltage level steady state
= Don’t care
= High impedance ”off” state
= Low–to–High clock transition
= Not a Low–to–High clock transition
A0 – A7
B0 – B7
PARITY
ERROR
CLEAR
GND
OEA
OEB
V
CP
CC
MODE
MODE
PIN NUMBER
23, 22, 21, 20,
2
19, 18, 17, 16
2, 3, 4, 5,
6, 7, 8, 9
CLEAR
14
15
10
13
12
24
11
1
H
H
H
H
L
1
CP
A port 3–State inputs/outputs
B port 3–State inputs/outputs
Enables the A outputs when Low
Enables the B outputs when Low
Parity output
Error output
Clears the error flag register when Low
Clock input
Ground (0V)
Positive supply voltage
OEB
X
X
H
H
L
L
INPUTS
NAME AND FUNCTION
OEA
H
H
L
L
Bn + Parity
of Lows
Even
Odd
X
X
X
INPUTS
2
(output)
of Highs
Even
Even
Odd
Odd
An
NA
X
Internal node
Bn + Parity
Point ”P”
(output)
(output)
of Lows
Even
Odd
NA
NA
X
H
X
X
X
L
(input)
(input)
NA
NA
An
Bn
Z
ERRORn–1
Pre–state
Output
H
X
X
X
L
OUTPUTS
(input)
NA
Bn
An
An
Objective specification
74ABT834
Z
OUTPUT
ERROR
NC
PARITY
H
H
L
L
(input)
NA
H
Z
H
L
L