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參數(shù)資料
| 型號(hào)： | 933714900118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO16 |
| 封裝： | PLASTIC, SOT-109, SO-16 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 53K |
| 代理商： | 933714900118 |
January 1995
2
Philips Semiconductors
Product specication
1-to-64 bit variable length shift register
HEF4557B
LSI
DESCRIPTION
The HEF4557B is a static clocked serial shift register
whose length may be programmed to be any number of
bits between 1 and 64. The number of bits selected is
equal to the sum of the subscripts of the enabled length
control inputs (L1, L2, L4, L8, L16 and L32) plus one. Serial
data may be selected from the DA or DB data inputs with
the A/B select input. This feature is useful for recirculation
purposes. Information on DA or DB is shifted into the first
register position and all the data in the register is shifted
one position to the right on the LOW to HIGH transition of
CP0 while CP1 is LOW or on the HIGH to LOW transition
of CP1 while CP0 is HIGH. A HIGH on master reset (MR)
resets the register and forces O to LOW and O to HIGH,
independent of the other inputs.
Fig.1 Functional diagram.
PINNING
DA, DB
data inputs
A/B
select data input
CP0
clock input
CP1
clock enable input
MR
asynchronous master reset
L1 to L32
bit-length control inputs
O, O
buffered outputs
Fig.2 Pinning diagram.
FAMILY DATA, IDD LIMITS category LSI
See Family Specifications
HEF4557BP(N):
16-lead DIL; plastic
(SOT38-1)
HEF4557BD(F):
16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4557BT(D):
16-lead SO; plastic
(SOT109-1)
( ): Package Designator North America
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