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參數(shù)資料
| 型號(hào)： | 933406850652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | 4000/14000/40000 SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT DOWN BINARY COUNTER, PDSO16 |
| 封裝： | PLASTIC, SOT-109-1, SO-16 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 106K |
| 代理商： | 933406850652 |
January 1995
3
Philips Semiconductors
Product specication
Programmable 4-bit binary down counter
HEF4526B
MSI
Fig.2 Pinning diagram.
HEF4526BP(N):
16-lead DIL; plastic
(SOT38-1)
HEF4526BD(F):
16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4526BT(D):
16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
PINNING
PL
parallel load input
P0 to P3
parallel inputs
CF
cascade feedback input
CP0
clock input (LOW to HIGH, triggered)
CP1
clock input (HIGH to LOW, triggered)
MR
asynchronous master reset input
TC
terminal count output
O0 to O3
buffered parallel outputs
COUNTING MODE
CF = HIGH; PL = LOW; MR = LOW
COUNT
OUTPUTS
O3
O2
O1
O0
15
H
14
H
L
13
H
L
H
12
H
L
11
H
L
H
10
H
L
H
L
9H
L
H
8H
L
7L
H
6L
H
L
5L
H
L
H
4L
H
L
3L
L
H
2L
L
H
L
1L
L
H
0L
L
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
CP0
CP1
MODE
H
X
reset (asynchronous)
L
H
X
preset (asynchronous)
L
H
no change
L
no change
L
X
no change
L
X
no change
L
counter advances
L
H
counter advances
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