MC74HCT138AN

Propagation Delay Time :
Maximum Operating Temperature : + 125 C
Supply Voltage - Max : 5.5 V
Supply Voltage - Min : 4.5 V
Logic Family : 74HC
Number of Bits : 3
Number of Lines (Input / Output) : 3 / 8
Packaging : Tube
Product : Decoders, Encoders, Multiplexers & Demultiplexers
Mounting Style : Through Hole
Package / Case : PDIP-16


Features:

• Output Drive Capability: 10 LSTTL Loads
• TTL/NMOS Compatible Input Levels
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 4.5 to 5.5 V
• Low Input Current: 1.0 mA
• In Compliance with the Requirements Defined by JEDEC Standard No. 7A
• Chip Complexity: 122 FETs or 30.5 Equivalent Ga


Pinout




Specifications

Symbol	Parameter	Value	Unit
vcc	DC Supply Voltage (Referenced to GND)	0.5 to +7.0	V
VIN	DC Input Voltage (Referenced to GND)	0.5 to VCC + 0.5	V
VOUT	DC Output Voltage (Referenced to GND)	0.5 to VCC + 0.5	V
LIN	DC Input Current, per Pin	±20	mA
IOUT	DC Onput Current, per Pin	±35	mA
ICC	DC Supply Current Per Supply Pin	±75	mA
PD	Power dissipation in still air piastic DIP SOIC package	750 500	mW
TSTG	Storage Temperature	65 to +150	°C
TL	Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package)	260	°C

* Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
†Derating - Plastic DIP: 10 mW/
C from 65
to 125
C
Ceramic DIP: 10 mW/
C from 100
to 125
C
SOIC Package: 7 mW/
C from 65
to 125
C
For high frequency or heavy load considerations, see Chapter 2 of the Motorola HighSpeed CMOS Data Book (DL129/D).


Description

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 threebit Address to oneofeight activelot outputs. This device features three Chip Select inputs, two activelow and one activehigh to facilitate the demultiplexing, cascading, and chipselecting 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.