• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High NoiseImmunity: N
V
= 5V
CC
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
= 0.8V (Max), VIH = 2V (Min)
IL
- CMOS Input Compatibility, I
• Memory Decoding, Data Routing, Code Conversion
= 30%, NIH= 30%of VCCat
IL
≤ 1µA at VOL, V
l
o
C to 125oC
OH
CD74HCT139
High-Speed CMOS Logic
Dual 2-to-4 Line Decoder/Demultiplexer
Description
The CD74HC139 and CD74HCT139 devices contain two
independent binary to one of four decoders each with a
single active low enable input (
inputs (1A0 and 1A1 or 2A0 and 2A1) cause one of the four
normally high outputs to go low.
If the enable input is high all four outputs remain high. For
demultiplexer operation the enable input is the data input.
The enable input also functions as a chip select when these
devices are cascaded. This device is functionally the same
as the CD4556B and is pin compatible with it.
The outputs of these devices can drive 10 low power
Schottky TTL equivalent loads. The 74HCT logic family is
functionally as well as pin equivalent to the 74LS logic family.
Ordering Information
PART NUMBER TEMP. RANGE (oC) PACKAGE
CD74HC139E-55 to 12516 Ld PDIPE16.3
CD74HCT139E-55 to 12516 Ld PDIPE16.3
CD74HC139M-55 to 12516 Ld SOICM16.15
CD74HCT139M-55 to 12516 Ld SOICM16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Die is available which meets all electrical specifications. Please
contact your local sales office or customer service for ordering
information.
1E or 2E). Data on the select
PKG.
NO.
Pinout
CD74HC139, CD74HCT139
(PDIP, SOIC)
TOP VIEW
16
1
1E
1A0
2
1A1
3
4
1Y0
5
1Y1
6
1Y2
7
1Y3
8
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
3. θJA is measured with the component mounted on an evaluation PC board in free air.
FIGURE 1. HC AND HCU TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
= 6ns
t
PLH
t
f
1.3V
10%
90%
t
3V
GND
TLH
tr = 6ns
INPUT
t
INVERTING
OUTPUT
THL
t
PHL
2.7V
1.3V
0.3V
FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
5
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
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