參數(shù)資料
型號(hào): 74HC40102
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: 8-bit synchronous BCD down counter
中文描述: 8位同步BCD碼遞減計(jì)數(shù)器
文件頁數(shù): 4/11頁
文件大?。?/td> 85K
代理商: 74HC40102
December 1990
4
Philips Semiconductors
Product specification
8-bit synchronous BCD down counter
74HC/HCT40102
FUNCTION TABLE
Notes
1.
2.
3.
Clock connected to CP.
Synchronous operation: changes occur on the LOW-to-HIGH CP transition.
Jam inputs: MSD = P
7
, LSD = P
0
.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
CONTROL INPUTS
PRESET MODE
ACTION
MR
PL
PE
TE
H
H
H
H
L
H
H
H
L
X
H
H
L
X
X
H
L
X
X
X
synchronous
inhibit counter
count down
preset on next LOW-to HIGH clock transition
preset asynchronously
clear to maximum count
asynchronous
Fig.4 Functional diagram.
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