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74AC257 Datasheet

  • 74AC257

  • QUAD 2 CHANNEL MULTIPLEXER 3-STATE

  • 10頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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74AC257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s
s
s
s
s
s
s
s
s
HIGH SPEED: t
PD
=4.5 ns (TYP.) at V
CC
= 5V
LOW POWER DISSIPATION:
I
CC
= 8
碌A(chǔ)
(MAX.) at T
A
= 25
o
C
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
50鈩?TRANSMISSION LINE DRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
BALANCED PROPAGATION DELAYS:
t
PLH
鈮?/div>
t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
IMPROVED LATCH-UP IMMUNITY
B
M
(Plastic Package)
(Micro Package)
ORDER CODES :
74AC257B
These IC鈥檚 are composed of an independent 2
channel multiplexer with common SELECT and
ENABLE INPUT.
The AC257 is a non inverting multiplexer.
When the ENABLE INPUT is held 鈥滺igh鈥? outputs
of both IC鈥檚 become high impedance state. If
SELECT INPUT is held 鈥滾ow鈥? 鈥滱鈥?data is
selected, when SELECT INPUT is 鈥滺igh鈥? 鈥滲鈥?/div>
data is chosen.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
DESCRIPTION
The AC257 is an advanced high-speed CMOS
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C
2
MOS technology.
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
Schottky TTL.
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 1997
1/10

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