DM74LS163A datasheet(7/12 Pages) FAIRCHILD

No de pièce	DM74LS163A

Description	Synchronous 4-Bit Binary Counters

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Fabricant	FAIRCHILD [Fairchild Semiconductor]

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Parameter Measurement Information

Switching Time Waveforms

DS006397-3

Note 15: The input pulses are supplied by generators having the following characteristics: PRR

≤ 1 MHz, duty cycle ≤ 50%,ZOUT ≈ 50Ω,tr ≤ 10 ns, tf ≤ 10 ns. Vary

PRR to measure fMAX.

Note 16: Outputs QD and carry are tested at tn+16 where tn is the bit time when all outputs are low.

Note 17: VREF = 1.5V.

Switching Time Waveforms

DS006397-4

Note 18: The input pulses are supplied by generators having the following characteristics: PRR

≤ 1 MHz, duty cycle ≤ 50%,ZOUT ≈ 50Ω,tr ≤ 6 ns, tf ≤ 6 ns. Vary

PRR to measure fMAX.

Note 19: Enable P and enable T setup times are measured at tn+0.

Note 20: VREF = 1.3V.

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