SN74HC138 (ACTIVE)

3-Line To 8-Line Decoders/Demultiplexers

 

Description

The SNx4HC138 devices are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories using a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

Features

  • Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems
  • Wide Operating Voltage Range (2 V to 6 V)
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-µA Maximum ICC
  • Typical tpd = 15 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1-µA Maximum
  • Active Low Outputs ( Selected Output is Low)
  • Incorporate Three Enable Inputs to Simplify Cascading or Data Reception

View more

Parametrics Compare all products in Buffered Encoders and Decoders

 
Function
Technology Family
VCC (Min) (V)
VCC (Max) (V)
Channels (#)
Voltage (Nom) (V)
F @ Nom Voltage (Max) (Mhz)
ICC @ Nom Voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
Configuration
Type
Output Drive (IOL/IOH) (Max) (mA)
Bits (#)
Rating
Operating Temperature Range (C)
Pin/Package
SN74HC138 SN54HC138 SN74HC138-Q1
Decoder/Demultiplexer    Decoder/Demultiplexer    Decoder   
HC    HC    HC   
2    2    2   
6    6    6   
1    1    1   
3.3
5   
3.3
5   
3.3
5   
28    28    28   
0.08    0.08    0.08   
45    45    45   
3:8    3:8    3:08   
Standard    Standard    Push-pull   
5.2/-5.2    5.2/-5.2    5.2/-5.2   
8    8    8   
Catalog    Military    Automotive   
-40 to 85    -55 to 125    -40 to 125   
16PDIP
16SO
16SOIC
16SSOP
16TSSOP   
16CDIP
16CFP
20LCCC   
16SOIC
16TSSOP   

Other qualified versions of SN74HC138

Version Part Number Definition
Military SN54HC138 QML certified for Military and Defense Applications
Automotive SN74HC138-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects