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74HC191 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. 74HC191
Description  Presettable synchronous 4-bit binary up/down counter
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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74HC191 Datasheet(HTML) 5 Page - NXP Semiconductors

 
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December 1990
5
Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
FUNCTION TABLE
TC AND RC FUNCTION TABLE
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
OPERATING MODE
INPUTS
OUTPUTS
PL
U/D
CE
CP
Dn
Qn
parallel load
L
L
X
X
X
X
X
X
L
H
L
H
count up
H
L
I
X
count up
count down
H
H
I
X
count down
hold (do nothing)
HXHX
X
no change
INPUTS
TERMINAL COUNT STATE
OUTPUTS
U/D
CE
CP
Q0
Q1
Q2
Q3
TC
RC
H
L
L
L
H
H
H
H
L
H
H
L
X
X
X
X
H
H
H
L
L
L
H
H
H
L
L
L
H
H
H
L
L
L
H
H
H
L
L
L
L
H
L
H
H
H
H
H
Fig.4 Functional diagram.


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