74LS257 Quad 2-Input Multiplexer Tri-State IC (74257) DIP-14 Package

These Schottky-clamped high-performance multiplexers feature 3-STATE outputs that can interface directly with data lines of bus-organized systems. With all but one of the common outputs disabled (at a high impedance state), the low impedance of the single enabled output will drive the bus line to a HIGH or LOW logic level. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output enable circuitry is designed such that the output disable times are shorter than the output enable times. This 3-STATE output feature means that n-bit (paralleled) data selectors with up to 258 sources can be implemented for data buses. It also permits the use of standard TTL registers for data retention throughout the system.

SKU: RW-02612

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Description

These Schottky-clamped high-performance multiplexers feature 3-STATE outputs that can interface directly with data lines of bus-organized systems. With all but one of the common outputs disabled (at a high impedance state), the low impedance of the single enabled output will drive the bus line to a HIGH or LOW logic level. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output enable circuitry is designed such that the output disable times are shorter than the output enable times. This 3-STATE output feature means that n-bit (paralleled) data selectors with up to 258 sources can be implemented for data buses. It also permits the use of standard TTL registers for data retention throughout the system.


Features :-

  • 3-STATE versions LS157 and LS158 with same pinouts
  • Schottky-clamped for significant improvement in A-C performance
  • Provides bus interface from multiple sources in high-performance systems
  • Average propagation delay from data input 12 ns
  • Typical power dissipation: 50mW


Specifications :-

  • Supply Voltage : 4.75 – 5.25V
  • Input HIGH Voltage : 2.0V
  • Input LOW Voltage : 0.8V
  • HIGH Level Output Current : -2.6mA
  • LOW Level Output Current : 24
  • Free Air Operating Temperature : 70?C


Package Includes :- 

1 X 74LS257 Quad 2-Input Multiplexer Tri-State IC (74257) DIP-14 Package

Additional information

Operating voltage

2.5 3.0V

Pixel Resolution

0.3MP

Photosensitive array

640 x 480

Optical Size

1.6 inch

Angel of view

67 degrees

Maximum Frame Rate

30fps VGA

Sensitivity

1.3V/(Lux-sec)

Dormancy

Less than 20A

Power consumption

60mW/15fpsVGA YUV

Temperature operation Range

-30 C ~ 70 C

Pixel area

3.6 x 3.6 m

Signal to noise ratio (SNR)

46 dB

Dynamic range

52 dB

Specification

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