參數(shù)資料
型號: 74VHC157M
廠商: Fairchild Semiconductor
文件頁數(shù): 3/10頁
文件大?。?/td> 0K
描述: IC MULTIPLEXER QUAD 2INP 16-SOIC
標(biāo)準(zhǔn)包裝: 48
系列: 74VHC
類型: 多路復(fù)用器
電路: 4 x 2:1
獨立電路: 1
輸出電流高,低: 8mA,8mA
電壓電源: 單電源
電源電壓: 2 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 管件
74VHC157
Quad
2-Input
Multiple
x
e
r
1992 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74VHC157 Rev. 1.2
2
Logic Symbols
IEEE/IEC
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Functional Description
The VHC157 is a quad 2-input multiplexer. It selects four
bits of data from two sources under the control of a
common Select input (S). The Enable input (E) is active-
LOW. When E is HIGH, all of the outputs (Z) are forced
LOW regardless of all other inputs. The VHC157 is the
logic implementation of a 4-pole, 2-position switch where
the position of the switch is determined by the logic
levels supplied to the Select input. The logic equations
for the outputs are shown below:
Za = E (I1a S + I0a S)
Zb = E (I1b S + I0b S)
Zc = E (I1c S + I0c S)
Zd = E (I1d S + I0d S)
A common use of the VHC157 is the moving of data from
two groups of registers to four common output busses.
The particular register from which the data comes is
determined by the state of the Select input. A less obvi-
ous use is as a function generator. The VHC157 can
generate any four of the sixteen different functions of two
variables with one variable common. This is useful for
implementing gating functions.
Inputs
Outputs
E
SI0
I1
Z
HX
X
L
LH
X
L
LH
X
H
LL
L
X
L
LL
H
X
H
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