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74ACT257B Datasheet

  • 74ACT257B

  • QUAD 2 CHANNEL MULTIPLEXER 3-STATE

  • 90.02KB

  • 10頁(yè)

  • STMICROELECTRONICS   STMICROELECTRONICS

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74ACT257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s
s
s
s
s
s
s
s
s
HIGH SPEED: t
PD
=5 ns (TYP.) at V
CC
= 5V
LOW POWER DISSIPATION:
I
CC
= 8
碌A(chǔ)
(MAX.) at T
A
= 25
o
C
COMPATIBLE WITH TTL OUTPUTS
V
IH
= 2V (MIN), V
IL
= 0.8V (MAX)
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) = 4.5V to 5.5V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
IMPROVED LATCH-UP IMMUNITY
B
M
(Plastic Package)
(Micro Package)
ORDER CODES :
74ACT257B
74ACT257M
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 closen.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
DESCRIPTION
The ACT257 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.
These IC鈥檚 are composed of an independent 2
channel multiplexer with common SELECT and
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 1997
1/10

74ACT257B 產(chǎn)品屬性

  • STMicroelectronics

  • 編碼器、解碼器、復(fù)用器和解復(fù)用器

  • Multiplexer

  • 74AC

  • 1 / 1

  • 8 ns at 5 V

  • 5.5 V

  • 4.5 V

  • + 85 C

  • Through Hole

  • DIP-16

  • Tube

  • - 40 C

  • 1

  • 1

  • 25

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