80C31BH Datasheet, PDF (12/16 Pages) Intel Corporation – CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

AUTOMOTIVE 80C31BH 80C51BH 87C51
EXTERNAL CLOCK DRIVE
Symbol
Parameter
Min Max Units
1 T_CLCL Oscillator Frequency 3 5 12 MHz
3 5 16
T_CHCX
T_CLCX
T_CLCH
T_CHCL
High Time
Low Time
Rise Time
Fall Time
20
ns
20
ns
20 ns
20 ns
EXTERNAL CLOCK DRIVE WAVEFORM
270419 – 17
SERIAL PORT TIMING SHIFT REGISTER MODE
Symbol
Parameter
T_XLXL
T_QVXH
T_XHQX
T_XHDX
T_XHDV
Serial Port Clock Cycle Time
Output Data Setup to Clock Rising Edge
Output Data Hold After Clock Rising Edge
Input Data Hold After Clock Rising Edge
Clock Rising Edge to Input Data Valid
12 MHz
Oscillator
Min Max
10
700
50
0
700
Variable
Oscillator
Units
Min
Max
12T_CLCL
ms
10T_CLCL^b133
ns
2T_CLCL^b117
ns
0
ns
10T_CLCL^b133 ns
SHIFT REGISTER MODE TIMING WAVEFORMS
AC TESTING INPUT OUTPUT WAVEFORMS
FLOAT WAVEFORMS
270419 – 15
270419 – 16
AC inputs during testing are driven at V_CC b 0 5 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’’
270419 – 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 V_OH V_OL level occurs I_OL I_OH
t g20 mA
12