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DM74LS161A Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. DM74LS161A
Description  Synchronous 4-Bit Binary Counters
Download  10 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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DM74LS161A Datasheet(HTML) 3 Page - Fairchild Semiconductor

 
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Parameter Measurement Information
Switching Time Waveforms
The input pulses are supplied by generators having the following characteristics:
PRR
≤ 1 MHz, duty cycle ≤ 50%, Z
OUT ≈ 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%, Z
OUT ≈ 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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