(China (Mainland))
Product Summary
The 74HCT138D is a high-speed Si-gate CMOS device and is pin compatible with low power Schottky TTL (LSTTL). The 74HCT138D is specified in compliance with JEDEC standard no. 7A. The 74HCT138D decoder accepts three binary weighted address inputs (A0, A1, A2) and when enabled, provides 8 mutually exclusive active LOW outputs (Y0 to Y7). The “138” features three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the “138” to a 1-of-32 (5 lines 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. Unused enable inputs must be permanently tied to their appropriate active HIGH or LOW state. The “138” is identical to the “238” but has inverting outputs.
Parametrics
74HCT138D absolute maximum ratings: (1)propagation delay CL = 15 pF; VCC = 5 V, tPHL/ tPLH: 17ns; (2)input capacitance, CI: 3.5 pF; (3)power dissipation capacitance per package, CPD: 67 pF.
Features
74HCT138D features: (1)Demultiplexing capability; (2)Multiple input enable for easy expansion; (3)Ideal for memory chip select decoding; (4)Active LOW mutually exclusive outputs; (5)Output capability: standard; (6)ICC category: MSI.
Diagrams
| Image | Part No | Mfg | Description |  |
Pricing (USD) |
Quantity | ||||||||||||
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 74HCT138D |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER DEMULTIPLEXER |
Data Sheet |
Negotiable |
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74HCT138D,652 |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER |
Data Sheet |
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74HCT138DB,118 |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER |
Data Sheet |
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74HCT138D,653 |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-8 LINE DCOD/DMUX |
Data Sheet |
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74HCT138DB,112 |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER |
Data Sheet |
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74HCT138DB |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER DEMULTIPLEXER |
Data Sheet |
Negotiable |
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74HCT138DB-T |
NXP Semiconductors |
Encoders, Decoders, Multiplexers & Demultiplexers 3-TO-8 DECODER DEMULTIPLEXER |
Data Sheet |
Negotiable |
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