74C922 查看數據表（PDF） - National ->Texas Instruments

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74C922

16-Key Encoder / 20-Key Encoder

National ->Texas Instruments 

Typical Performance Characteristics

Typical Irp vs VIN at

Any Y Input

Typical Ron vs VOUT at

Any X Output

TL F 6037 – 6

Typical FSCAN vs COSC

TL F 6037 – 7

Typical Debounce Period

vs CKBM

TL F 6037 – 8

Typical Applications

Synchronous Handshake (MM74C922)

TL F 6037 – 9

Synchronous Data Entry Onto Bus (MM74C922)

TL F 6037 – 10

TL F 6037 – 11

Outputs are enabled when valid entry is made and

go into TRI-STATE when key is released

Note 3 The keyboard may be synchronously scanned by omitting the capacitor at osc and driving osc directly if the system clock rate is lower than 10 kHz

5

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