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87C51 Datasheet(PDF) 16 Page - Intel Corporation

Part # 87C51
Description  CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

87C51 Datasheet(HTML) 16 Page - Intel Corporation

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87C5180C51BH80C31BH
SERIAL PORT TIMINGSHIFT REGISTER MODE
12 MHz
24 MHz
Variable Oscillator
Symbol
Parameter
Oscillator
Oscillator
Units
Min
Max
Min
Max
Min
Max
TXLXL
Serial Port Clock
10
0500
12TCLCL
m
s
Cycle Time
TQVXH
Output Data Setup
700
284
10TCLCLb133
ns
to Clock Rising Edge
TXHQX
Output Data Hold
ns
After Clock
Rising Edge
87C51BH
50
2TCLCLb117
87C51-24BH-24
34
2TCLCLb34
TXHDX
Input Data Hold
0
0
0
ns
After Clock
Rising Edge
TXHDV
Clock Rising Edge
700
283
10TCLCLb133
ns
to Input Data Valid
SHIFT REGISTER MODE TIMING WAVEFORMS
272335 – 18
AC TESTING INPUT OUTPUT WAVEFORMS
272335 – 19
AC inputs during testing are driven at VCC b 05 for a Logic ‘‘1’’
and 045V for a Logic ‘‘0’’ Timing measurements are made at VIH
min for a Logic ‘‘1’’ and VIL max for a Logic ‘‘0’’
FLOAT WAVEFORMS
272335 – 20
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
16


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