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参数资料
| 型号： | 93459PC |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | PLD |
| 英文描述： | OT PLD, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 4/4页 |
| 文件大小： | 346K |
| 代理商： | 93459PC |
December 1990
4
Philips Semiconductors
Product specication
4-bit bidirectional universal shift register
74HC/HCT194
FUNCTION TABLE
Notes
1. H
= HIGH voltage level
h
= HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
L
= LOW voltage level
I
= LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
q,d = lower case letters indicate the state of the referenced input (or output) one set-up time prior to the
LOW-to-HIGH CP transition
X
= don’t care
↑
= LOW-to-HIGH CP transition
OPERATING MODES
INPUTS
OUTPUTS
CP
MR
S1
S0
DSR
DSL
Dn
Q0
Q1
Q2
Q3
reset (clear)
X
L
XXXXX
LLLL
hold (“do nothing”)
X
H
I
X
q0
q1
q2
q3
shift left
↑
H
h
I
X
I
h
X
q1
q2
q3
L
H
shift right
↑
H
I
h
I
h
X
L
H
q0
q1
q2
parallel load
↑
Hh
h
X
dn
d0
d1
d2
d3
Fig.4 Functional diagram.
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