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is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.MM74HCT138 3-to-8 Line Decoder
February 1984
Revised February 1999
MM74HCT138
3-to-8 Line Decoder
the 74LS138. All inputs are protected from damage due to
General Description
static discharge by diodes to V and ground.
CC
The MM74HCT138 decoder utilizes advanced silicon-gate
MM74HCT devices are intended to interface between TTL
CMOS technology, and are well suited to memory address
and NMOS components and standard CMOS devices.
decoding or data routing applications. Both circuits feature
These parts are also plug-in replacements for LS-TTL
high noise immunity and low power consumption usually
devices and can be used to reduce power consumption in
associated with CMOS circuitry, yet have speeds compara-
existing designs.
ble to low power Schottky TTL logic.
The MM74HCT138 have 3 binary select inputs (A, B, and
Features
C). If the device is enabled these inputs determine which
one of the eight normally HIGH outputs will go LOW. Two TTL input compatible
active LOW and one active HIGH enables (G1, G2A and
Typical propagation delay: 20 ns
G2B) are provided to ease the cascading decoders.
Low quiescent current: 80 A maximum (74HCT Series)
The decoders output can drive 10 low power Schottky TTL
Low input current: 1 A maximum
equivalent loads and are functionally and pin equivalent to
Fanout of 10 LS-TTL loads
Ordering Code:
Order Number Package Number Package Description
MM74HCT138M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
MM74HCT138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HCT138MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HCT138N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code.
Connection Diagram
Pin Assignments for DIP, SOIC, SOP and TSSOP
1999 Fairchild Semiconductor Corporation DS005362.prf www.fairchildsemi.com