M80C51FB Datasheet, PDF (12/12 Pages) Intel Corporation – CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

M80C51FB
EXTERNAL CLOCK DRIVE
Symbol
Parameter
Min
Max
Units
1 TCLCL
Oscillator Frequency
M80C51FB
35
12
MHz
M80C51FB-16
35
16
TCHCX
High Time
20
ns
TCLCX
Low Time
20
ns
TCLCH
Rise Time
20
ns
TCHCL
Fall Time
20
ns
EXTERNAL CLOCK DRIVE WAVEFORM
A C TESTING INPUT
Input Output Waveforms
271172 – 14
Float Waveforms
271172 – 15
AC Inputs during testing are driven at V_CCb0 5V for a Logic ‘‘1’’
and 0 45V for a Logic ‘‘0’’ Timing measurements are made at V_IH
min for a Logic ‘‘1’’ and V_IL max for a Logic ‘‘0’’
271172 – 16
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 V_OH V_OL level occurs
I_OL I_OH t g20 mA
12