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參數(shù)資料
| 型號(hào)： | 935264000118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 編、解碼器及復(fù)用、解復(fù)用 |
| 英文描述： | AHCT/VHCT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16 |
| 封裝： | 3.90 MM, PLASTIC, MS-012AC, SOT-109-1, SO-16 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | 935264000118 |
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1999 Sep 24
2
Philips Semiconductors
Product specication
Quad 2-input multiplexer
74AHC157;
74AHCT157
FEATURES
ESD protection: HBM EIA/JESD22-A114-A
exceeds 2000 V MM EIA/JESD22-A115-A
exceeds 200 V CDM EIA/JESD22-C101
exceeds 1000 V
Balanced propagation delays
All inputs have Schmitt-trigger actions
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Inputs accept voltages higher than VCC
For AHC only: operates with CMOS input levels
For AHCT only: operates with TTL input levels
Specified from 40 to +85 and +125 °C.
FUNCTION TABLE
See note 1.
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don’t care.
DESCRIPTION
The 74AHC/AHCT157 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 74AHC/AHCT157 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 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 a 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 determine by the
logic levels applied to S.
The logic equations are:
1Y = E
× (1I1 × S+1I0 × S);
2Y = E
× (2I1 × S+2I0 × S);
3Y = E
× (3I1 × S+3I0 × S);
4Y = E
× (4I1 × S+4I0 × S).
The ‘157’ is identical to the ‘158’ but has non-inverting
(true) outputs.
INPUT
OUTPUT
ES
nI0
nI1
nY
H
XXX
L
LLL
X
L
LL
H
X
H
LH
X
L
HXH
H
ORDERING INFORMATION
OUTSIDE NORTH
AMERICA
NORTH AMERICA
PACKAGES
PINS
PACKAGE
MATERIAL
CODE
74AHC157D
16
SO
plastic
SOT109-1
74AHC157PW
74AHC157PW DH
16
TSSOP
plastic
SOT403-1
74AHCT157D
16
SO
plastic
SOT109-1
74AHCT157PW
74AHCT157PW DH
16
TSSOP
plastic
SOT403-1
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