SN74AHC138 3-Line To 8-Line Decoder / Demultiplexer | TI.com

SN74AHC138 (ACTIVE)

3-Line To 8-Line Decoder / Demultiplexer

3-Line To 8-Line Decoder / Demultiplexer - SN74AHC138
Datasheet
 

Description

The ’AHC138 decoders/demultiplexers are designed for high-performance memory-decoding and data-routing applications that require 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 utilizing 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.

The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.

Features

  • Operating Range 2-V to 5.5-V VCC
  • Designed Specifically for High-Speed Memory Decoders and Data-Transmission Systems
  • Incorporate Three Enable Inputs to Simplify Cascading and/or Data Reception
  • Latch-Up Performance Exceeds 250 mA Per JESD 17
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)

View more

Parametrics Compare all products in Encoders & 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
IOL (Max) (mA)
IOH (Max) (mA)
Rating
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
Bits (#)
Digital input leakage (Max) (uA)
ESD CDM (kV)
ESD HBM (kV)
SN74AHC138 SN54AHC138
Decoder
Demultiplexer    
Decoder/Demultiplexer    
AHC     AHC    
2     2    
5.5     5.5    
1     1    
3.3
5    
3.3
5    
110     110    
0.04     0.04    
13
9.5    
13
9.5    
3:8     3:8    
Standard     Standard    
50     50/-50    
-50      
Catalog     Military    
-40 to 85     -55 to 125    
PDIP | 16
SOIC | 16
SO | 16
SSOP | 16
TSSOP | 16
TVSOP | 16
VQFN | 16    
CDIP | 16
CFP | 16
LCCC | 20    
See datasheet (PDIP)
16SO: 80 mm2: 7.8 x 10.2 (SO | 16)
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)
16SSOP: 48 mm2: 7.8 x 6.2 (SSOP | 16)
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
16TVSOP: 23 mm2: 6.4 x 3.6 (TVSOP | 16)
16VQFN: 14 mm2: 3.5 x 4 (VQFN | 16)    
See datasheet (CDIP)
See datasheet (CFP)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
8     8    
5     5    
0.75     0.75    
2     2