Back to List

Bare Die Product Detail: 74LS138

Decoder/Encoder/Multiplexer:
3-to-8 Line Decoder/Demultiplexer made on a 2µm 40V Bipolar process. Decodes 1-of-8 lines, set by 3 binary select inputs & 3 enable inputs. Operates as 8-output demultiplexer by 1 active LOW Enable set as data input & other Enable inputs as strobes.

Direct replacement for legacy Fairchild 74LS138, National 74LS138, Motorola 74LS138 & Texas Instruments SN74LS138, 74LS138.

Features:
** END OF LIFE ** NOT RECOMMENDED FOR NEW DESIGN

Expandable to a 24-line decoder with no external inverters
Expansion to a 32-line decoder requires only one inverter
Short propagation delay times versus standard memory access times
Input Clamp Diodes Limit High Speed Termination Effects
Low Power - I_CC 10mA (Max)
Typical Power Dissipation of 32 mW
Suitable for performance data decoding & routing where short propagation delay times are needed.
For high reliability versions see part 54LS138

Vendor:
Silicon Supplies
Electrical Datasheet

Die Physical Data:
Footprint: 2.739mm² (4245.463mil²)
Request Pad Layout

Product Families: Used for this device are tabulated below.

Decoder/Encoder/Multiplexer

Functional:

Function: -
I/P Level: TTL
O/P Level: TTL
Config: -
3-State O/P: No

Specification:

V_{CC (Min)}: 4.75V
V_{CC (Max)}: 5.25V
f_MIN @ V_NOM: 35MHz
t_{pd (Max)} @ V_NOM: 41.0ns
I_{CC (Max)} @ V_NOM: 10.000mA
V_{NOM (Max)}: 5.3V

Other Detail: Important information for this device is tabulated below.

Traffic light setting for Minimum Order Quantity indicates the following:

Green:Available from stock or at low factory MOQ.
Amber: Available on factory order with MOQ.
Red: High factory MOQ may apply, please ask for details.

Traffic light setting for High Reliability indicates the following:

Green: This bare die is specified and tested for use in high reliability applications.
Amber: This bare die can meet higher reliability specifications with additional testing & qualification, please ask for details.
Red: This bare die is not specified or specifically designed for use in high reliability applications.

Traffic light setting for Space Grade indicates the following:

Green: This bare die is qualified for space applications or has space level qualification data, please ask for details.
Amber: This bare die can be specified for space applications with additional testing and qualification, please ask for details.
Red: Suitability of this bare die for space applications is unknown and requires further qualification, please ask for details.