MB2646 Datasheet, PDF (4/16 Pages) NXP Semiconductors – Dual octal bus transceiver/registers 3-State

Philips Semiconductors Products
Dual octal bus transceiver/registers (3-State)
LOGIC DIAGRAM
nOE
nDIR
nCPBA
nSBA
nCPAB
nSAB
nA0
1of 8 Channels
1D
C1
Q
1D
C1
Q
Product specification
MB2646
nB0
nA1
nB1
nA2
nB2
nA3
nB3
nA4
DETAIL A X 7
nB4
nA5
nB5
nA6
nB6
nA7
nB7
FUNCTION TABLE
INPUTS
nOE
nDIR nCPAB nCPBA
nSAB nSBA
DATA I/O
nAx
nBx
OPERATING MODE
X
X
↑
X
X
X
Input
Unspecified
output*
Store A, B unspecified
X
X
X
↑
X
X
Unspecified
output*
Input
Store B, A unspecified
H
H
X
↑
↑
X
X
X
H or L H or L
X
X
Input
Input
Store A and B data
Isolation, hold storage
L
L
L
L
X
X
X
X
L
H or L
X
H
Output
Input
Real time B data to A bus
Stored B data to A bus
L
L
H
X
X
H
H or L
X
L
X
H
X
Input
Output
Real time A data to B bus
Stored A data to B bus
H = High voltage level
L = Low voltage level
X = Don’t care
↑ = Low-to-High clock transition
*
The data output function may be enabled or disabled by various signals at the nOE input. Data input functions are always enabled, i.e.,
data at the bus pins will be stored on every Low-to-High transition of the clock.
August 23, 1993
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