74ACT257M STMICROELECTRONICS [STMicroelectronics], 74ACT257M Datasheet

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74ACT257M

Manufacturer Part Number
74ACT257M
Description
QUAD 2 CHANNEL MULTIPLEXER 3-STATE
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet

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PIN CONNECTION AND IEC LOGIC SYMBOLS
April 1997
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
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
Schottky TTL.
These IC’s are composed of an independent 2
channel multiplexer with common SELECT and
HIGH SPEED: t
LOW POWER DISSIPATION:
I
COMPATIBLE WITH TTL OUTPUTS
V
50 TRANSMISSION LINE DRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|I
BALANCED PROPAGATION DELAYS:
t
OPERATING VOLTAGE RANGE:
V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
IMPROVED LATCH-UP IMMUNITY
CC
PLH
OH
IH
CC
= 8 A (MAX.) at T
= 2V (MIN), V
| = I
(OPR) = 4.5V to 5.5V
t
PHL
OL
= 24 mA (MIN)
PD
IL
=5 ns (TYP.) at V
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
= 0.8V (MAX)
A
= 25
2
MOS technology.
o
C
CC
= 5V
ENABLE INPUT.
The AC257 is a non inverting multiplexer.
When the ENABLE INPUT is held ”High” outputs
of both IC’s become high impedance state. If
SELECT INPUT is held ”Low”, ”A” data is
selected, when SELECT INPUT is ”High”, ”B”
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.
(Plastic Package)
74ACT257B
B
ORDER CODES :
74ACT257
(Micro Package)
74ACT257M
M
1/10

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74ACT257M Summary of contents

Page 1

... 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. 74ACT257 M (Micro Package) 74ACT257M 1/10 ...

Page 2

INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE O E SELECT DON’T CARE Z = HIGH IMPEDANCE LOGIC DIAGRAMS This logic diagram has not be used to estimate ...

Page 3

ABSOLUTE MAXIMUM RATINGS Symbol Parameter V Supply Voltage Input Voltage I DC Output Voltage Input Diode Current Output Diode Current Output Current ...

Page 4

DC SPECIFICATIONS Symbol Parameter V High Level Input Voltage IH V Low Level Input Voltage IL V High Level Output OH Voltage V Low Level Output OL Voltage I Input Leakage Current State Output Leakage OZ ...

Page 5

AC ELECTRICAL CHARACTERISTICS (C Symbol Parameter t Propagation Delay Time PLH PHL t Propagation Delay Time PLH t SEL to Y PHL t Output Enable Time PZL t PZH t Output Disable Time PLZ t ...

Page 6

WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS (f=1MHz; 50% duty cycle) WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS (f=1MHz; 50% duty cycle) 6/10 ...

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WAVEFORM 3: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 74ACT257 7/10 ...

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Plastic DIP16 (0.25) MECHANICAL DATA DIM. MIN. TYP. a1 0. 2.54 e3 17. 8/10 mm MAX. MIN. 0.020 1.65 0.030 0.5 20 8.5 7.1 5.1 3.3 1.27 ...

Page 9

SO16 MECHANICAL DATA mm DIM. MIN. TYP 0 0.35 b1 0. 9.8 E 5.8 e 1.27 e3 8.89 F 3.8 G 4 inch MAX. MIN. TYP. 1.75 0.2 ...

Page 10

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsabilit y for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results ...

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