74HC299 データシートの表示（PDF） - Philips Electronics
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74HC299 Datasheet PDF : 11 Pages
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Philips Semiconductors
8-bit universal shift register; 3-state
Product specification
74HC/HCT299
Fig.4 Functional diagram.
MODE SELECT TABLE
INPUTS
MR
S1
S0
CP
L
X
X
X
H
H
H
↑
H
L
H
↑
H
H
L
↑
H
L
L
X
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH CP transition
RESPONSE
asynchronous reset; Q0−Q7 = LOW
parallel load; I/On → Qn
shift right; DSR → Q0, Q0 → Q1 etc.
shift left; DSL → Q7, Q7 → Q6 etc.
hold
December 1990
4
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