74LS161 Просмотр технического описания (PDF) - Fairchild Semiconductor

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74LS161

Synchronous 4-Bit Binary Counters

Fairchild Semiconductor 

Parameter Measurement Information

Switching Time Waveforms

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.

Outputs QD and carry are tested at tN+16 where tN is the bit time when all outputs are LOW.

VREF = 1.5V.

Switching Time Waveforms

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.

Enable P and enable T setup times are measured at tN+0.

VREF = 1.3V.

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