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參數資料
| 型號： | 935273778115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 編、解碼器及復用、解復用 |
| 英文描述： | HC/UH SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, QCC16 |
| 封裝： | SOT-763, 16 PIN |
| 文件頁數： | 10/11頁 |
| 文件大?。?/td> | 176K |
| 代理商： | 935273778115 |
74HC/HCT138; 3-to-8 line
decoder/demultiplexer;
inverting
Information as of 2004-04-09
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datasheet
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Applications
Block diagram
General description
The 74HC/HCT138 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC standard no. 7A.
The 74HC/HCT138 decoders accept three binary weighted address inputs (A0, A1, A2) and when enabled, provide 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.
Features
q
Demultiplexing capability
q
Multiple input enable for easy expansion
q
Ideal for memory chip select decoding
q
Active LOW mutually exclusive outputs
q
Output capability: standard
q
ICC category: MSI
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