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參數(shù)資料
| 型號(hào)： | 74HC157 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Quad 2-Input Data Selectors/Multiplexers |
| 中文描述： | 四2輸入數(shù)據(jù)選擇器/多路復(fù)用器 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 44K |
| 代理商： | 74HC157 |
December 1990
2
Philips Semiconductors
Product specification
Quad 2-input multiplexer
74HC/HCT157
FEATURES
Non-inverting data path
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT157 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT157 are quad 2-input multiplexers which
select 4 bits of data from two sources under the control of
a common data select input (S). The four outputs present
the selected data in the true (non-inverted) form. The
enable input (E) is active LOW. When E is HIGH, all of the
outputs (1Y to 4Y) are forced LOW regardless of all other
input conditions.
Moving the data from two groups of registers to four
common output buses is a common use of the “157”. The
state of the common data select input (S) determines the
particular register from which the data comes. It can also
be used as function generator.
The device is useful for implementing highly irregular logic
by generating any four of the 16 different functions of two
variables with one variable common.
The “157” is the logic implementation of a 4-pole,
2-position switch, where the position of the switch is
determined by the logic levels applied to S.
The logic equations are:
1Y = E.(1l
1
.S + 1l
0
.S)
2Y = E.(2l
1
.S + 2l
0
.S)
3Y = E.(3l
1
.S + 3l
0
.S)
4Y = E.(4l
1
.S + 4l
0
.S)
The “157” is identical to the “158” but has non-inverting
(true) outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
propagation delay
nI
0
, nI
1
to nY
E to nY
S to nY
input capacitance
power dissipation capacitance per multiplexer notes 1 and 2
C
L
= 15 pF; V
CC
= 5 V
11
11
12
3.5
70
13
12
19
3.5
70
ns
ns
ns
pF
pF
C
I
C
PD
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|---|---|
| 74HC157_10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Quad 2-input multiplexer |
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| 74HC157BQ-Q100,115 | 制造商:NXP Semiconductors 功能描述:Multiplexer 1-Element CMOS 8-IN 16-Pin DHVQFN EP T/R 制造商:NXP Semiconductors 功能描述:74HC157BQ-Q100/DHVQFN16/REEL7/ - Tape and Reel 制造商:NXP Semiconductors 功能描述:IC MUX QUAD 2INPUT 16DHVQFN |
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