Image 74HC138D,653
型号: 74HC138D,653
厂商: NXP Semiconductors NXP Semiconductors
分类: 半导体集成电路 - IC
描述: encoders, decoders, multiplexers & Demultiplexers 3-OF-8 decoder/demux
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Manufacturer: NXP
Product Category: Encoders, Decoders, Multiplexers & Demultiplexers
RoHS: Yes
Brand: NXP Semiconductors
Logic Family: HC
Number of Input Lines: 3
Number of Output Lines: 8
Propagation Delay Time: 50 ns
Supply Voltage - Max: 6 V
Supply Voltage - Min: 2 V
Maximum Operating Temperature: + 125 C
Mounting Style: SMD/SMT
Package / Case: SOT-109
Packaging: Reel
Minimum Operating Temperature: - 40 C
Number of Lines In/Out: 3 / 8
Factory Pack Quantity: 2500
Part # Aliases: 74HC138D-T
74HC138; 74HCT138  
3-to-8 line decoder/demultiplexer; inverting  
Rev. 4 — 27 June 2012  
Product data sheet  
1. General description  
The 74HC138; 74HCT138 is a high-speed Si-gate CMOS device and is pin compatible  
with Low-power Schottky TTL (LSTTL).  
The 74HC138; 74HCT138 decoder accepts three binary weighted address inputs (A0, A1  
and A3) and when enabled, provides 8 mutually exclusive active LOW outputs (Y0 to Y7).  
The 74HC138; 74HCT138 features three enable inputs: two active LOW (E1 and E2) and  
one active HIGH (E3). Every output is HIGH unless E1 and E2 are LOW and E3 is HIGH.  
This multiple enable function allows easy parallel expansion of the 74HC138; 74HCT138  
to a 1-of-32 (5 lines to 32 lines) decoder with just four 74HC138; 74HCT138 ICs and one  
The 74HC138; 74HCT138 can be used as an eight output demultiplexer by using one of  
the active LOW enable inputs as the data input and the remaining enable inputs as  
strobes. Permanently tie unused enable inputs to their appropriate active HIGH- or  
The 74HC138; 74HCT138 is identical to the 74HC238; 74HCT238 but has inverting  
2. Features and benefits  
Demultiplexing capability  
Multiple input enable for easy expansion  
Complies with JEDEC standard no. 7A  
Ideal for memory chip select decoding  
Active LOW mutually exclusive outputs  
ESD protection:  
HBM EIA/JESD22-A114F exceeds 2000 V  
MM EIA/JESD22-A115-A exceeds 200 V  
Multiple package options  
Specified from 40 °C to +85 °C and from 40 °C to +125 °C