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Description
16-Key Encoder 20-Key Encoder
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General Description
The 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 kΩ on resistance to be used. No diodes in the switch array are needed to eliminate ghosts witches.The internal debounce circuit needs only a single external capacitor and can be defeated by omitting the capacitor. A Data Available output goes to a high level when a valid keyboard entry has been made. The Data Available output returns to a low level when the entered key is released, even if another key is depressed.The Data Available will return high to indicate acceptance of the new key after a normal debounce period; this two-key roll-over is provided between any two switches.
An internal register remembers the last key pressed even after the key is released.The 3-STATE outputs provide for easy expansion and bus operation and are LPTTL compatible.
Features
● 50 kΩ maximum 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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10000 buyer reviews from United States
Kenneth Hall
Length of registration:7 years
I recently purchased the 74C922N electronic component from Utsource and am very pleased with its performance. It is a reliable and cost-effective solution for my application. I would highly recommend Utsource for its qu products and excellent customer service.
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03/17/2023
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All UTSOURCE purchases have a 60 days money back return policy, plus a 90 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
74C922
74C922 has several brands around the world that may have alternate names for 74C922 due to regional differences or acquisition. 74C922 may also be known as the following names:
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Stock Status: 10000
Minimum: 2
Total Price:
Unit Price:2.05500
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