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74VHC157 반도체 회로 부품 판매점

QUAD 2 CHANNEL MULTIPLEXER



STMicroelectronics 로고
STMicroelectronics
74VHC157 데이터시트, 핀배열, 회로
® 74VHC157
QUAD 2 CHANNEL MULTIPLEXER
s HIGH SPEED: tPD = 4.1 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s POWER DOWN PROTECTION ON INPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
s IMPROVED LATCH-UP IMMUNITY
s LOW NOISE: VOLP = 0.8V (Max.)
DESCRIPTION
The 74VHC157 is an high-speed CMOS QUAD
2-CHANNEL MULTIPLEXER fabricated with
sub-micron silicon gate and double-layer metal
wiring C2MOS technology.
It consists of four 2-input digital multiplexers with
common select and strobe inputs. It is a
PRELIMINARY DATA
M1
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHC157M
74VHC157T
non-inverting multiplexer. When the STROBE
input is held high, selection of data is inhibited
and all the outputs become low. The SELECT
decoding determines whether the A or B inputs
get routed to their corresponding Y outputs.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage. This device can be
used to interface 5V to 3V.All inputs and outputs
are equipped with protection circuits against static
discharge, giving them 2KV ESD immunity and
transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
June 1999
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74VHC157 데이터시트, 핀배열, 회로
74VHC157
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 5, 11, 14
3, 6, 10, 13
4, 7,9, 12
15
8
16
S YM BO L
SELECT
1A to 4A
1B to 4B
1Y to 4Y
STROBE
GND
VCC
NAME AND FUNCTION
Common Data Select Input
Data Inputs From
Source A
Data Inputs From
Source B
Multiplexer Outputs
Strobe Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
STROBE
H
L
L
L
L
X:”H” or ”L”
LOGIC DIAGRAM
SELE CT
X
L
L
H
H
INPUT
A
X
L
H
X
X
OUTPUT
BY
XL
XL
XH
LL
HH
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74VHC157 multiplexer

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