74abt853db NXP Semiconductors, 74abt853db Datasheet - Page 2

• Manufacturer Part Number: 74abt853db
• Description: 8-bit Transceiver With 9-bit Parity Checker/ Generator And Flag Latch 3-state
• Manufacturer: NXP Semiconductors

1. Error checking is detailed in the Error Flag Function Table below.
2. When ENABLE is Low, ERROR is Low if the sum of A inputs is even or ERROR is High if the sum of A inputs is odd.
Philips Semiconductors
PIN DESCRIPTION
FUNCTION TABLE
NOTES:
ERROR FLAG FUNCTION TABLE
H
L
X
Z
1995 Sep 06
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
8-bit transceiver with 9-bit parity checker/
generator and flag latch (3-State)
= High voltage level steady state
= Low voltage level steady state
= Don’t care
= High impedance ”off” state
Sample
SYMBOL
MODE
ENABLE
ERROR
A0 – A7
B0 – B7
PARITY
Clear
Store
CLEAR
Pass
OEA
OEB
GND
V
CC
MODE
2
ENABLE
H
H
L
L
23, 22, 21, 20, 19, 18, 17, 16
1
2, 3, 4, 5, 6, 7, 8, 9
PIN NUMBER
CLEAR
H
H
L
L
INPUTS
14
15
10
11
13
12
24
1
OEB
H
H
L
L
Bn + PARITY
OF HIGHS
Even
Even
Odd
Odd
X
X
X
OEA
H
H
L
L
2
OF HIGHS
INPUTS
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/input
Error output (open collector)
Clears the error flag register when Low
Enable input (active-Low)
Ground (0V)
Positive supply voltage
(output)
Even
Even
Odd
Odd
An
X
INTERNAL NODE
POINT ”P”
H
H
L
L
X
X
X
Bn + PARITY
OF HIGHS
(output)
(output)
NAME AND FUNCTION
X
X
PRE–STATE
ERRORn–1
OUTPUT
(input)
(input)
An
Bn
H
H
Z
X
X
L
X
L
OUTPUTS
(input)
74ABT853
Product specification
Bn
An
An
Z
OUTPUT
ERROR
PARITY
H
H
H
H
L
L
L
L
(input)
H
H
L
Z
L