74HC/HCT251

General description

The 74HC/HCT251 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/HCT251 are the logic implementations of single-pole 8-position switches with the state of three select inputs (S₀,S₁,S₂) controlling the switch positions.
Assertion (Y) and negation (Y) outputs are both provided. The output enable input (OE) is active LOW. The logic function provided at the output, when activated, is:

Y =OE.(I₀.S₀.S₁.S₂ + I₁.S₀.S₁.S₂ +
+ I₂.S₀.S₁.S₂ + I₃.S₀.S₁.S₂ +
+ I₄.S₀.S₁.S₂ + I₅.S₀.S₁.S₂ +
+ I₆.S₀.S₁.S₂ + I₇.S₀.S₁.S₂)

Both outputs are in the high impedance OFF-state (Z) when the output enable input is HIGH, allowing multiplexer expansion by tying the outputs.

Features

• True and complement outputs
• Both outputs are 3-state for further multiplexer expansion
• Multifunction capability
• Permits multiplexing from n-lines to one line
• Output capability: standard
• I_CC category: MSI

Products/packages

Pricing/ordering/availability

Applications

• Thin and thick film circuits
• General purpose fast switching applications.

Design support

Support Documents

HCT_USER_GUIDE; HC/T User Guide (1997-11-01)

Parametrics/similar products

Similar products
74HC/HCT251 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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