74HCT139

Features:

· Demultiplexing capability
· Two independent 2-to-4 decoders
· Multifunction capability
· Active LOW mutually exclusive outputs
· Output capability: standard
· I_CC category: MSI




Pinout






Description

The 74HCT139 is high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard no. 7A.

The 74HCT139 is high-speed, dual 2-to-4 line decoder/multiplexers. This device has two independent decoders, each accepting two binary weighted inputs (nA₀ and nA₁) and providing four mutually exclusive active LOW outputs (nY₀ to nY₃). Each decoder has an active LOW enable input (nE).

When nE is HIGH, every output is forced HIGH. The enable can be used as the data input for a 1-to-4 demultiplexer application.

The "139" is identical to the HEF4556 of the HE4000B family.

The 74HCT139 is high-speed Si-gate CMOS devices and are pin compatible with low power schottky TTL (LSTTL). It is specified in compliance with JEDEC standard no. 7A. It is high-speed, dual 2-to-4 line decoder which has independent decoders, each accepting two binary weighted inputs (nA0 and nA1) and providing four mutually exclusive active low outputs (nY0 to nY3). Each decoder has an active low enable input (nE).

The six features of the 74HCT139. The first one is demultiplexing capability. The second one is two independent 2-to-4 decoders. The third one is multifunction capability. The fourth one is active low mutually exclusive outputs. The fifth one is its output capability would be standard. The sixth one is its ICC category would be MSI. That are all the main features.

Some important AC characteristics and specifications of the 74HCT139 have been concluded into several points as follow.For Tamb=25°C the first one is about its propagation delay nAn to Yn which would be typ 39ns and max 145ns at Vcc=2.0V and would be typ 14ns and max 29ns at Vcc=4.5V and would be typ 11ns and max 25ns at Vcc=6.0V. The second one is about its propagation delay nE to nYn which would be typ 33ns and max 135ns at Vcc=2.0V and typ 12ns and max 27ns at Vcc=4.5V and would be typ 10ns and max 23ns at Vcc=6.0V. The third one is about its output transition time which would be typ 19ns and max 75ns at Vcc=2.0V and typ 7ns and max 15ns at Vcc=4.5V and would be typ 6ns and max 13ns at Vcc=6.0V.

Also for the Tamb range of the 74HCT139 -40 to +125°C the first one is about its propagation delay nAn to Yn which would be max 220ns at Vcc=2.0V and would be max 44ns at Vcc=4.5V and would be max 38ns at Vcc=6.0V. The second one is about its propagation delay nE to nYn which would be max 205ns at Vcc=2.0V and max 41ns at Vcc=4.5V and would be max 35ns at Vcc=6.0V. The third one is about its output transition time which would be max 110ns at Vcc=2.0V and max 22ns at Vcc=4.5V and would be max 19ns at Vcc=6.0V. And so on. For more information about the 74HCT139 please contact us.