MM74C922WM
Encoder 1 to 4 Key CMOS 20-Pin SOIC W Rail
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MM74C922WM 數據表
價格 (USD)
數量 | 單價 | 總價 |
---|---|---|
1 | $20.433 | $20.43 |
200 | $7.908 | $1,581.60 |
500 | $7.630 | $3,815.00 |
1000 | $7.492 | $7,492.00 |
這些價格會受到市場波動的影響,需要提交報價才能取得最新價格。
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 ! | Encoders, Decoders, Multiplexers & Demultiplexers | RoHS | Details |
Product | Decoders, Encoders, Multiplexers & Demultiplexers | Logic Family | 74C |
Number of Bits | 4 bit | Number of Input Lines | 8 Input |
Number of Output Lines | 5 Output | Propagation Delay Time | 150 ns at 5 V, 80 ns at 10 V, 60 ns at 15 V |
Supply Voltage - Min | 3 V | Supply Voltage - Max | 15 V |
Minimum Operating Temperature | - 55 C | Maximum Operating Temperature ! | + 125 C |
Mounting Style | SMD/SMT | Package / Case | SOIC-20 |
Brand | onsemi / Fairchild | Function | Encoder |
Height | 2.35 mm | Input Voltage | - 300 mV to 300 mV |
Length | 13 mm | Logic Type | Encoder |
Number of Circuits | Single | Operating Supply Voltage ! | 3 V to 15 V |
Output Current ! | 8 mA | Output Voltage | - 300 mV to 300 mV |
Pd - Power Dissipation | 700 mW | Product Type ! | Encoders, Decoders, Multiplexers & Demultiplexers |
Series | MM74C922 | Factory Pack Quantity | 36 |
Subcategory | Logic ICs | Width | 7.6 mm |
Part # Aliases | MM74C922WM_NL | Unit Weight | 0.028254 oz |
數據表 PDF
數據表記錄了器件的特性、絕對最大額定值、應用等,這對於作為器件特定應用的整體指南大有裨益。
常見問題解答
What is MM74C922WM?
The MM74C922WM is a 16-key remote control encoder designed by Fairchild Semiconductor. It is commonly used in applications requiring keypad input functions, such as remote controls, security systems, and access control devices.
How Does MM74C922WM Work?
The MM74C922WM functions as a key encoder by converting the key presses from a keypad into a binary or BCD (Binary Coded Decimal) output. It includes debouncing circuitry to ensure accurate key press detection and a serial data output format for easy interfacing with microcontrollers or other digital systems.
How Many Pins does MM74C922WM have and What are the Functions of the Pinout Configuration?
The MM74C922WM is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:
- VSS, VDD: Ground and power supply pins, respectively.
- NC: No connection pin.
- CLK, DATA: Clock and data input pins for keypad scanning.
- CS0, CS1: Chip select pins for device activation.
- Q0-Q3: Binary or BCD encoded output pins.
- QA-QD: Key identification pins.
What are the Pros and Cons of MM74C922WM?
Pros:
- Keypad Interface: Designed for easy integration with keypads and keypad scanning applications.
- Debouncing Circuitry: Ensures accurate key press detection by filtering out noise and bounce.
- Binary or BCD Output: Provides flexibility in output format for different system requirements.
- Serial Data Output: Facilitates easy interfacing with microcontrollers or other digital devices.
- 5V Operation: Can be powered by a standard 5V supply, common in many digital systems.
Cons:
- Complexity: May require additional components for complete keypad scanning systems.
- Programming Required: May need programming to handle the serial data output for specific applications.
- Availability: Availability of the MM74C922WM may vary depending on market conditions and stock.
Are There Any Equivalents/Alternatives to MM74C922WM for Recommendation?
- The HT9180 from Holtek is a similar 16-key encoder suitable for keypad applications.
- Alternatives to the MM74C922WM include the ELM9229 from ELM Technology and the HT12E from Holtek.
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