Product Summary

The SN74HC138N is a 3 line to 8 line decoder. The device is designed to be used in high-performance memory-decoding or datarouting applications requiring very short propagation delay times. In high-performance memory systems, the SN74HC138N can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of the SN74HC138N 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 decoder is negligible.

Parametrics

SN74HC138N absolute maximum ratings: (1)Supply voltage range, VCC: -0.5 V to 7 V; (2)Input clamp current, IIK (VI < 0 or VI > VCC): ±20 mA; (3)Output clamp current, IOK (VO < 0 or VO > VCC): ±20 mA; (4)Continuous output current, IO (VO = 0 to VCC): ±25 mA; (5)Continuous current through VCC or GND: ±50 mA; (6)Package thermal impedance, θJA (see Note 2): 73℃/W.

Features

SN74HC138N features: (1)Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems; (2)Wide Operating Voltage Range of 2 V to 6 V; (3)Outputs Can Drive Up To 10 LSTTL Loads; (4)Low Power Consumption, 80-μA Max ICC; (5)Typical tpd = 15 ns; (6)±4-mA Output Drive at 5 V; (7)Low Input Current of 1 μA Max; (8)Incorporate Three Enable Inputs to Simplify Cascading and/or Data Reception.

Diagrams

SN74HC138N logic diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
SN74HC138N
SN74HC138N

Texas Instruments

Encoders, Decoders, Multiplexers & Demultiplexers 3-to-8 Line Decoder

Data Sheet

0-1: $0.26
1-25: $0.19
25-100: $0.15
100-250: $0.14
SN74HC138NE4
SN74HC138NE4

Texas Instruments

Encoders, Decoders, Multiplexers & Demultiplexers 3 to 8-Line Decdr/Demltplxer

Data Sheet

0-1: $0.22
1-25: $0.17
25-100: $0.15
100-250: $0.11
SN74HC138NSR
SN74HC138NSR

Texas Instruments

Encoders, Decoders, Multiplexers & Demultiplexers 3-to-8 Line Decoder

Data Sheet

0-1: $0.23
1-25: $0.18
25-100: $0.15
100-250: $0.11
SN74HC138NSRG4
SN74HC138NSRG4

Texas Instruments

Encoders, Decoders, Multiplexers & Demultiplexers 3 to 8-Line Decdr/Demltplxer

Data Sheet

0-1: $0.22
1-25: $0.17
25-100: $0.15
100-250: $0.11