MC74HCT138A: 1-of-8 Decoder/Demultiplexer with LSTTL Compatible Inputs

The MC74HCT138A is identical in pinout to the LS138. The HCT138A may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. The HCT138A decodes a three bit Address to one of eight active lot outputs. This device features three Chip Select inputs, two active low and one active high to facilitate the demultiplexing, cascading, and chip selecting functions. The demultiplexing function is accomplished by using the Address inputs to select the desired device output; one of the Chip Selects is used as a data input while the other Chip Selects are held in their active states.

Features
  • Chip Complexity: 122 FETs or 30.5 Equivalent Gates
  • Output Drive Capability: 10 LSTTL Loads
  • TTL/NMOS Compatible Input Levels
  • Operating Voltage Range: 4.5 to 5.5 V
  • Low Input Current: 1.0 µA
  • Outputs Directly Interface to CMOS, NMOS, and TTL
  • In Compliance with the Requirements Defined by JEDEC Standard No. 7A
  • Pb-Free Packages are Available*
Packages
Simulation Models (2)
Document TitleDocument ID/SizeRevisionRevision Date
IBIS Model for MC74HCT138ADMC74HCT138AD.IBS (5.0kB)0
IBIS Model for MC74HCT138ANMC74HCT138AN.IBS (5.0kB)0
Package Drawings (2)
Document TitleDocument ID/SizeRevision
SOIC 16 LEAD751B-05 (38.2kB)K
TSSOP-16948F-01 (41.7kB)B
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
1-of-8 Decoder/Demultiplexer with LSTTL Compatible InputsMC74HCT138A/D (94kB)11Jun, 2015
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
MC74HCT138ADGActivePb-free Halide freeSOIC-16751B-051Tube48$0.18
MC74HCT138ADR2GActivePb-free Halide freeSOIC-16751B-051Tape and Reel2500$0.18
MC74HCT138ADTR2GActivePb-free Halide freeTSSOP-16948F-011Tape and Reel2500$0.116
Specifications
ProductChannelsVCC Min (V)VCC Max (V)tpd Max (ns)IO Max (mA)
MC74HCT138ADG14.55.5274
MC74HCT138ADR2G14.55.5274
MC74HCT138ADTR2G14.55.5274
1-of-8 Decoder/Demultiplexer with LSTTL Compatible Inputs (94kB) MC74HCT138A
IBIS Model for MC74HCT138AD MC74HCT138A
IBIS Model for MC74HCT138AN MC74HCT138A
SOIC 16 LEAD MC14504B
TSSOP-16 MC14504B