74ABT16646 Просмотр технического описания (PDF) - Philips Electronics
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74ABT16646 Datasheet PDF : 12 Pages
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Philips Semiconductors
16-bit bus transceiver/register (3-State)
Product specification
74ABT16646
74ABTH16646
PIN CONFIGURATION
1DIR 1
1CPAB 2
1SAB 3
GND 4
1A0 5
1A1 6
VCC 7
1A2 8
1A3 9
1A4 10
GND 11
1A5 12
1A6 13
1A7 14
2A0 15
2A1 16
2A2 17
GND 18
2A3 19
2A4 20
2A5 21
VCC 22
2A6 23
2A7 24
GND 25
2SAB 26
2CPAB 27
2DIR 28
56 1OE
55 1CPBA
54 1SBA
53 GND
52 1B0
51 1B1
50 VCC
49 1B2
48 1B3
47 1B4
46 GND
45 1B5
44 1B6
43 1B7
42 2B0
41 2B1
40 2B2
39 GND
38 2B3
37 2B4
36 2B5
35 VCC
34 2B6
33 2B7
32 GND
31 2SBA
30 2CPBA
29 20E
SH00026
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.
1998 Feb 27
3
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