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MM74C991N Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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MM74C991N Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 8 page www.fairchildsemi.com 4 AC Electrical Characteristics (Note 4) VCC = 5V, tr = tf = 20 ns, CL = 50 pF Note 4: AC Parameters are guaranteed by DC correlated testing. Note 5: Capacitance guaranteed by periodic testing. Switching Time Waveforms Write Data Waveforms 3-STATE Waveforms Symbol Parameter Conditions Min Typ Max Units tCW Chip Enable to Write Enable Set-Up Time TJ = 25°C35 15 ns TJ = 125°C50 20 ns tAW Address to Write Enable Set-Up Time TJ = 25°C35 15 ns TJ = 125°C50 20 ns tWW Write Enable Width TJ = 25°C 400 225 ns TJ = 125°C 450 250 ns tDW Data to Write Enable Set-Up Time TJ = 25°C 390 225 ns TJ = 125°C 430 250 ns tWD Write Enable to Data Hold Time TJ = 25°C0 −10 ns TJ = 125°C0 −15 ns tWA Write Enable to Address Hold Time TJ = 25°C0 −10 ns TJ = 125°C0 −15 ns tWC Write Enable to Chip Enable Hold Time TJ = 25°C55 30 ns TJ = 125°C75 40 ns t1H, t0H Logical “1”, Logical “0” Levels into 3-STATE RL=10k, CL=10 pF TJ = 25°C 275 500 ns TJ = 125°C 325 600 ns tH1, tH0 3-STATE to Logical “1” or RL=10k, CL=10 pF Logical “0” Levels TJ = 25°C 325 600 ns TJ = 125°C 375 700 ns tD1, tD0 Propagation Delay from Digit Input to TJ = 25°C 500 1000 ns Segment Output TJ = 125°C 700 1400 ns tIB Interdigit Blanking Time TJ = 25°C5 10 µs TJ = 125°C10 20 µs fMUX Multiplex Scan Frequency TJ = 25°C525 Hz TJ = 125°C375 Hz CIN Input Capacitance (Note 5) 5 7.5 pF COUT 3-STATE Output Capacitance (Note 5) 30 50 pF |
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