SN74AHCT138 3-Line to 8-Line Decoder / Demultiplexer | TI.com

SN74AHCT138 (ACTIVE) 3-Line to 8-Line Decoder / Demultiplexer

3-Line to 8-Line Decoder / Demultiplexer - SN74AHCT138
Datasheet
 

Description

The ’AHCT138 3-line to 8-line decoders/demultiplexers are designed to be used in high-performance memory-decoding and data-routing applications that require very short propagation-delay times. In high-performance memory systems, this decoder 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 this decoder and the enable time of the memory usually are less than the typical access time of the memory. This means that the effective system delay introduced by the decoder 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

  • Inputs Are TTL-Voltage Compatible
  • 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)

Parametrics

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Part number Order 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)
SN74AHCT138 Order now Decoder
Demultiplexer    
AHCT     4.5     5.5     1     5     70     0.04     12     3:8     Standard     8     -8     Catalog     -40 to 85     PDIP | 16
SOIC | 16
SO | 16
SSOP | 16
TSSOP | 16
TVSOP | 16
VQFN | 16    
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)    
8     5     0.75     2    
SN54AHCT138 Samples not available Decoder/Demultiplexer     AHCT     4.5     5.5     1     5     70     0.04     12     3:8     Standard     8/-8       Military     -55 to 125     CDIP | 16
CFP | 16
LCCC | 20    
See datasheet (CDIP)
See datasheet (CFP)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
8     5     0.75     2