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产品描述
20-Key Encoder
Package: DIP
No of Pins: 20
Container: Rail
本网站上使用的所有产品名称，商标，品牌和徽标均为其各自所有者的财产。 具有这些名称，商标，品牌和徽标的产品的描述或销售仅用于标识目的，并不表示与任何权利所有者有任何隶属关系或授权。
本产品参数和性能指表均来自互联网，如有误差，请参考原厂技术参数!！
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 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.
Features
● 50kΩ 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
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
|---|---|---|---|
| ≥1: | US $2.29515 | US $2.06564 | US $2.06564 |
| ≥5: | US $1.53010 | US $1.37709 | US $6.88545 |
| ≥10: | US $1.37709 | US $1.23938 | US $12.39380 |
| ≥20: | US $1.33884 | US $1.20496 | US $24.09920 |
| ≥50: | US $1.30058 | US $1.17052 | US $58.52600 |
| ≥100: | US $1.26233 | US $1.13610 | US $113.61000 |
| ≥200: | US $1.22408 | US $1.10167 | US $220.33400 |
| ≥500: | US $1.20878 | US $1.08790 | US $543.95000 |
| ≥1000: | US $1.18583 | US $1.06725 | US $1067.25000 |
替代产品
| Product Name | Description |
|---|---|
| MM74HC923 | High-speed CMOS BCD-to-7-segment latch/decoder/driver with active-low reset and active-low lamp test inputs. |
| MM74HCT923 | High-speed CMOS BCD-to-7-segment latch/decoder/driver with active-low reset and active-low lamp test inputs, TTL compatible. |
| SN74HC923 | High-speed CMOS BCD-to-7-segment latch/decoder/driver with active-low reset and active-low lamp test inputs. |
| SN74HCT923 | High-speed CMOS BCD-to-7-segment latch/decoder/driver with active-low reset and active-low lamp test inputs, TTL compatible. |
产品用途
The MM74C923N is a 10-bit to 4-digit BCD (Binary-Coded Decimal) decoder/driver, commonly used in digital display applications. It converts a 10-bit binary input into a 4-digit BCD output, which can then be used to drive 7-segment displays or other types of numeric displays.
Here are some typical circuits and applications where the MM74C923N might be used:
Digital Clocks:
Counters:
Frequency Counters:
Odometers and Speedometers:
Test Equipment:
Thermometers:
Industrial Control Panels:
Educational Kits:
Here is a basic example of how the MM74C923N might be used in a circuit to drive a 7-segment display:
Input Signal:
Power Supply:
Output to Display:
7-Segment Display:
1.2 Million+ Like Utsource
Required+5V
|
|--- Vcc (Pin 16 of MM74C923N)
|
|--- Vcc (Pin 16 of 7447)
|
|--- GND (Pin 8 of MM74C923N)
|--- GND (Pin 8 of 7447)
|
|--- GND (Common cathode of 7-segment display)
|
+5V ---[10-bit Binary Input]--- (Pins 1-10 of MM74C923N)
|
|--- (BCD Output Pins 11-14 of MM74C923N) --- (BCD Input Pins 1-4 of 7447)
|
|--- (Segment Outputs A-G of 7447) --- (Segments A-G of 7-segment display)
This is a simplified example, and actual implementations may require additional components for debouncing, filtering, and driving higher current loads.
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| 国旗 | 国家 | 预计送达时间 | 最低首重费用 | ||
|---|---|---|---|---|---|
| 快递 | 专线 | 快递 (0.5kg) | 专线 (0.05kg) | ||
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Returns are normally accepted when completed within 90 days from the date of the parcel delivered.
Defective ( Please provide a third party quality report of nonconforming products)
Return Freight charges must be prepaid; we will not accept COD shipments.
Warranty
All UTSOURCE purchases have a 90 days money back return policy, plus a 100 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.
MM74C923N
MM74C923N has several brands around the world that may have alternate names for MM74C923N due to regional differences or acquisition. MM74C923N may also be known as the following names:
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库存状态: 10000
起订量: 2
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