74HC190 Datasheet, PDF (5/13 Pages) NXP Semiconductors – Presettable synchronous BCD decade up/down counter

Philips Semiconductors
Presettable synchronous BCD decade
up/down counter
Product specification
74HC/HCT190
Fig.4 Functional diagram.
FUNCTION TABLE
OPERATING MODE
parallel load
count up
count down
hold (do nothing)
INPUTS
PL U/D
CE
CP
L
X
X
X
L
X
X
X
H
L
I
↑
H
H
I
↑
H
X
H
X
OUTPUTS
D_n
Q_n
LL
HH
X count up
X count down
X no change
TC AND RC FUNCTION TABLE
INPUTS
U/D
CE
CP
H
H
X
L
H
X
L
L
L
H
X
H
H
X
H
L
TERMINAL COUNT STATE
Q₀
Q₁
Q₂
Q₃
H
X
X
H
H
X
X
H
H
X
X
H
L
L
L
L
L
L
L
L
L
L
L
L
Notes
1. H = HIGH voltage level
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
X = don’t care
↑ = LOW-to-HIGH CP transition
= one LOW level pulse
= TC goes LOW on a LOW-to-HIGH CP transition
OUTPUTS
TC
RC
L
H
H
H
L
H
H
H
December 1990
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