Encoders, Decoders, Multiplexers & Demultiplexers 16-Key Encoder
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MM74C922N Product Details
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 ghost switches. 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.
■ 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
- Decoders, Encoders, Multiplexers & Demultiplexers
- Logic Family
- Number of Bits
- Number of Lines (Input / Output)
- 8 / 5
- Propagation Delay Time
- 150 ns at 5 V, 80 ns at 10 V, 60 ns at 15 V
- Supply Voltage Max
- 15 V
- Supply Voltage Min
- 3 V
- Maximum Operating Temperature
- + 125 C
- Mounting Style
- Through Hole
- Package / Case
- Minimum Operating Temperature
- - 55 C
- Number of Input Lines
- Number of Output Lines
- Power Dissipation
- 700 mW
- Factory Pack Quantity
- Part # Aliases
MM74C922N Related Products
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Estimated Delivery Time: Dec 04 - Dec 09 days (choose Expedited at checkout).
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1.We provide 90 days warranty.
2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.
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- Q: Are the ON's MM74C922N price and stock displayed on the platform accurate?
- The ON's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for MM74C922N, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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- Q: What is the process for returns or replacement of MM74C922N?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment.
If there is something wrong with the MM74C922N we delivered, we will accept the replacement or return of the MM74C922N only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of MM74C922N.
(3)The MM74C922N is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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