74C922N
Perfect for prototyping or production use, this 74C922N encoder provides reliable and repeatable switching in an industry-standard package74C922N
Perfect for prototyping or production use, this 74C922N encoder provides reliable and repeatable switching in an industry-standard package
Quality Assurance
Quality Assurance
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Certification
We have successfully obtained various certification standards and have established our own professional testing laboratory. This ensures that every product we supply to our customers meets the highest quality standards. We adhere to strict testing protocols to maintain the consistency and accuracy of our products. To ensure that our products are original and genuine, we also collaborate with reputable third-party testing facilities to conduct rigorous quality testing. Our commitment to quality extends to meeting industry, legal, regulatory, and ISO 9001:2015 requirements.
Shipping & Payment
Shipping & Payment
About Shipping
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Service & Packaging
Service & Packaging
About After Sales Service
All Parts Extended Quality Guarantee
Initiate the application within 90 days from the shipment date.
Confirm the return or exchange with our staff.
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Lastly, please note that the eligibility for return or exchange of goods is subject to an assessment of the actual condition of the returned items. We will evaluate the received goods before finalizing the return or exchange process. If you have any inquiries or require further assistance regarding returns or exchanges, please don't hesitate to contact us at [email protected]
About packaging
Regarding packaging, our products are carefully packed in anti-static bags to provide ESD anti-static protection. The outer packaging is durable with secure closure. We support various packaging methods such as Tape and Reel, Cut Tape, Tube, or Tray.
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Example
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74C922N DataSheet
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Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!
Details
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
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Key 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
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
Product Category ! | IC Chips |
FAQs
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.
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Brand: Onsemi Package/Case: PDIP-16
6,078 In Stock
Cargo cycle: 3~7 Days
The minimum order is 1