87C51RA 데이터 시트보기 (PDF) - Intel
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87C51RA Datasheet PDF : 20 Pages
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EXTERNAL CLOCK DRIVE
Symbol
Parameter
1 TCLCL
Oscillator Frequency
8XC51RX
8XC51RX-1
8XC51RX-20
8XC51RX-24
TCHCX
High Time
TCLCX
Low Time
TCLCH
Rise Time
8XC51RX
8XC51RX-24
TCHCL
Fall Time20
8XC51RX
8XC51RX-24
Min
35
35
35
35
0 35 TOSC
0 35 TOSC
EXTERNAL CLOCK DRIVE WAVEFORM
8XC51RA RB RC
Max
12
16
20
24
0 65 TOSC
0 65 TOSC
20
10
20
10
Units
MHz
ns
ns
ns
ns
ns
ns
ns
AC TESTING INPUT OUTPUT WAVEFORMS
FLOAT WAVEFORMS
272659 – 16
272659 – 17
AC Inputs during testing are driven at VCCb0 5V for a Logic ‘‘1’’
and 0 45V for a Logic ‘‘0’’ Timing measurements are made at VIH
min for a Logic ‘‘1’’ and VIL max for a Logic ‘‘0’’
272659 – 18
For timing purposes a port pin is no longer floating when a
100 mV change from load voltage occurs and begins to float
when a 100 mV change from the loaded VOH VOL level occurs
IOL IOH e g20 mA
15
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