參數(shù)資料
型號(hào): HEF4526B
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: Programmable 4-bit binary down counter(可編程4位二進(jìn)制減法計(jì)數(shù)器)
中文描述: 可編程4位二進(jìn)制減計(jì)數(shù)器(可編程4位二進(jìn)制減法計(jì)數(shù)器)
文件頁(yè)數(shù): 3/10頁(yè)
文件大?。?/td> 109K
代理商: HEF4526B
January 1995
3
Philips Semiconductors
Product specification
Programmable 4-bit binary down counter
HEF4526B
MSI
Fig.2 Pinning diagram.
HEF4526BP(N):
16-lead DIL; plastic
(SOT38-1)
16-lead DIL; ceramic (cerdip)
(SOT74)
16-lead SO; plastic
(SOT109-1)
HEF4526BD(F):
HEF4526BT(D):
( ): Package Designator North America
PINNING
PL
P
0
to P
3
CF
CP
0
CP
1
MR
TC
O
0
to O
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
COUNTING MODE
CF = HIGH; PL = LOW; MR = LOW
COUNT
OUTPUTS
O
3
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
O
2
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
O
1
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
O
0
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
FUNCTION TABLE
Notes
1.
H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
= positive-going transition
= negative-going transition
MR
PL
CP
0
X
X
CP
1
X
X
H
MODE
H
L
L
X
H
L
reset (asynchronous)
preset (asynchronous)
no change
L
L
L
no change
L
L
X
no change
L
L
X
no change
L
L
L
counter advances
L
L
H
counter advances
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