74HC652 데이터 시트보기 (PDF) - NXP Semiconductors.
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74HC652 Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal bus transceiver/register; 3-state
Product specification
74HC/HCT652
FUNCTION TABLE
INPUTS (1)
DATA I/O (2)
OPERATION OR FUNCTION
OEAB OEBA CPAB CPBA SAB SBA
L
H H or L H or L X X
L
H
↑
↑
XX
X
H
↑ H or L X X
H
H
↑
↑
LX
L
X H or L ↑
XX
L
L
↑
↑
XL
L
L
X
X XL
L
L
X H or L X H
H
H
X
X
LX
H
H H or L X H X
H
L H or L H or L H H
A1 THRU A8
Input
Input
Input
Not specified
Ouput
Ouput
Input
Output
B1 THRU B8
Input
Not specified
Output
Input
Input
Input
Output
Output
HC/HCT652
Isolation
Store A and B data
Store A, Hold B
Store A in both registers
Hold A, Store B
Store B in both registers
Real Time B Data to A Bus
Stored B Data to A Bus
Real Time A Data to B Bus
Stored A Data to B Bus
Stored A Data to B Bus and
Stored B Data to A Bus
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH transition
2. The data output functions may be enabled or disabled by various signals at OEAB and OEBA inputs. Data input
functions are always enabled, i.e., data at the bus inputs will be stored on every LOW-to-HIGH transition on the clock
inputs.
Fig.4 Functional diagram.
September 1993
4
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