hef4526b NXP Semiconductors, hef4526b Datasheet - Page 3

• Manufacturer Part Number: hef4526b
• Description: Programmable 4-bit Binary Down Counter
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PINNING
COUNTING MODE
CF = HIGH; PL = LOW; MR = LOW
January 1995
PL
P
CF
CP
CP
MR
TC
O
0
Programmable 4-bit binary down counter
0
to P
0
1
COUNT
to O
15
14
13
12
10
11
9
8
7
6
5
4
3
2
1
0
3
3
parallel load input
parallel inputs
cascade feedback input
clock input (LOW to HIGH, triggered)
clock input (HIGH to LOW, triggered)
asynchronous master reset input
terminal count output
buffered parallel outputs
Fig.2 Pinning diagram.
O
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
3
O
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
2
OUTPUTS
O
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
1
O
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
0
3
FUNCTION TABLE
Notes
1. H = HIGH state (the more positive voltage)
HEF4526BP(N): 16-lead DIL; plastic
HEF4526BD(F):
HEF4526BT(D):
( ): Package Designator North America
MR
H
L
L
L
L
L
L
L
L = LOW state (the less positive voltage)
X = state is immaterial
= positive-going transition
= negative-going transition
PL
H
X
L
L
L
L
L
L
CP
X
X
X
H
L
16-lead DIL; ceramic (cerdip)
16-lead SO; plastic
(SOT38-1)
(SOT74)
(SOT109-1)
0
CP
H
X
X
X
L
1
reset (asynchronous)
preset (asynchronous)
no change
no change
no change
no change
counter advances
counter advances
Product specification
HEF4526B
MODE
MSI