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74HCT138 반도체 회로 부품 판매점

3-to-8 line decoder/demultiplexer



NXP Semiconductors 로고
NXP Semiconductors
74HCT138 데이터시트, 핀배열, 회로
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Rev. 6 — 28 December 2015
Product data sheet
1. General description
The 74HC138; 74HCT138 decodes three binary weighted address inputs (A0, A1 and A2)
to eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs
(E1, E2 and E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH.
This multiple enable function allows easy parallel expansion to a 1-of-32 (5 to 32 lines)
decoder with just four ‘138’ ICs and one inverter. The ‘138’ can be used as an eight output
demultiplexer by using one of the active LOW enable inputs as the data input and the
remaining enable inputs as strobes. Inputs include clamp diodes. This enables the use of
current limiting resistors to interface inputs to voltages in excess of VCC.
2. Features and benefits
Complies with JEDEC standard no. 7A
Input levels:
For 74HC138: CMOS level
For 74HCT138: TTL level
Demultiplexing capability
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Active LOW mutually exclusive outputs
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 C to +85 C and from 40 C to +125 C
3. Ordering information
Table 1. Ordering information
Type number
Package
Temperature range Name
74HC138D
40 C to +125 C SO16
74 HCT138D
74HC138DB
40 C to +125 C SSOP16
74HCT138DB
Description
plastic small outline package; 16 leads;
body width 3.9 mm
plastic shrink small outline package; 16 leads;
body width 5.3 mm
Version
SOT109-1
SOT338-1


74HCT138 데이터시트, 핀배열, 회로
NXP Semiconductors
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Table 1. Ordering information …continued
Type number
Package
Temperature range Name
Description
Version
74HC138PW
74HCT138PW
40 C to +125 C TSSOP16 plastic thin shrink small outline package;
16 leads; body width 4.4 mm
SOT403-1
74HC138BQ
74HCT138BQ
40 C to +125 C
DHVQFN16 plastic dual in-line compatible thermal enhanced SOT763-1
very thin quad flat package; no leads;
16 terminals; body 2.5 3.5 0.85 mm
4. Functional diagram



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Fig 3. Logic diagram
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Fig 2. Functional diagram
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74HC_HCT138
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 28 December 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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74HCT138 multiplexer

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