74C922N

Name: 74C922N Signal Switches, Multiplexers, Decoders
Brand: Fairchild Semiconductor
SKU: 74C922N
Rating: 4.5 (10 reviews)
Author: Lisleapex

Perfect for prototyping or production use, this 74C922N encoder provides reliable and repeatable switching in an industry-standard package

1 有效庫存

74C922N

有效庫存1

Perfect for prototyping or production use, this 74C922N encoder provides reliable and repeatable switching in an industry-standard package

製造商零件號 # : 74C922N
其他名稱 : MM74C922N
包裝/封裝: 18-DIP
製造商: Fairchild Semiconductor
產品分類 : Signal Switches, Multiplexers, Decoders
系列 : 74C922

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74C922N 數據表

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74C922N 詳細說明

General DescriptionThe MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SPST switches. The keyboard scan can be implemented by either an external clock or external capacitor. These encoders also have on-chip pull-up devices which permit switches with up to 50 kΩon resistance to be used.Features■ 50 kΩmaximum switch on resistance■ On or off chip clock■ On-chip row pull-up devices■ 2 key roll-over■ Keybounce elimination with single capacitor■ Last key register at outputs■ 3-STATE output LPTTL compatible■ Wide supply range: 3V to 15V■ Low power consumption

主要特徵

50 kΩmaximum switch on resistance
On or off chip clock
On-chip row pull-up devices
2 key roll-over
Keybounce elimination with single capacitor
Last key register at outputs
3-STATE output LPTTL compatible
Wide supply range: 3V to 15V
Low power consumption

規格

以下是所選零件的基本參數，涉及零件的特性及其所屬類別。

Product Category !

IC Chips

常見問題解答

What is 74C922N?

The 74C922N is an integrated circuit (IC) designed as a 16-key encoder typically used for keypads in various applications. It converts the key press combinations into a 4-bit binary equivalent output for easy interfacing with microcontrollers or digital systems.

How Does 74C922N Work?

The 74C922N functions by scanning the key matrix connected to its inputs and generating a 4-bit binary code corresponding to the pressed key. It employs a priority encoding scheme to identify the highest priority key press, enabling sequential scanning of the keys for accurate detection. The output data can be used for further processing or control purposes.

How Many Pins does 74C922N have and What are the Functions of the Pinout Configuration?

The 74C922N is typically available in a 20-pin DIP (Dual Inline Package) configuration. The pinout configuration includes:

VCC: Power supply pin.
GND: Ground pin.
A0-A3: Key matrix inputs for row/column scanning.
STB: Strobe input for initiating a key press scan.
OE: Output enable for tri-state output control.
RST: Reset pin for initializing the scanning process.
Y0-Y3: 4-bit binary output pins.

What are the Pros and Cons of 74C922N?

Pros:

Easy Integration: Simplifies keypad interfacing with microcontrollers or digital systems.
Priority Encoding: Efficiently detects key presses with a priority scheme.
Binary Output: Provides a straightforward 4-bit binary output for key identification.
Versatile Applications: Suitable for various applications requiring keypad input processing.

Cons:

Limited Key Capacity: Supports up to 16 keys, which may be insufficient for larger keypads.
Additional Components: May require external components for debouncing or noise filtering depending on the application.

Are There Any Equivalents/Alternatives to 74C922N for Recommendation?

The 74LS922 from Texas Instruments is a similar 16-key encoder IC.
Alternatives to the 74C922N include the HT9170B from Holtek Semiconductor and the MM74C922 from Fairchild Semiconductor.