Intel 80C51FA User Manual
AUTOMOTIVE 80C51FA/83C51FA
SERIAL PORT TIMING-SHIFT REGISTER MODE
Test Conditions
:
T
A
e b
40
§
C to
a
125
§
C; V
CC
e
5V
g
10%; V
SS
e
0V; Load Capacitance
e
80 pF
Symbol
Parameter
12 MHz Oscillator
Variable Oscillator
Units
Min
Max
Min
Max
T
XLXL
Serial Port Clock Cycle Time
1
12T
CLCL
m
s
T
QVXH
Output Data Setup to Clock
700
10T
CLCL
b
133
ns
Rising Edge
T
XHQX
Output Data Hold after
50
2T
CLCL
b
117
ns
Clock Rising Edge
T
XHDX
Input Data Hold After Clock
0
0
ns
Rising Edge
T
XHDV
Clock Rising Edge to Input
700
10T
CLCL
b
133
ns
Data Valid
SHIFT REGISTER MODE TIMING WAVEFORMS
270501±15
EXTERNAL CLOCK DRIVE
Symbol
Parameter
Min
Max
Units
1/T
CLCL
Oscillator Frequency
3.5
16
MHz
T
CHCX
High Time
20
ns
T
CLCX
Low Time
20
ns
T
CLCH
Rise Time
20
ns
T
CHCL
Fall Time
20
ns
EXTERNAL CLOCK DRIVE WAVEFORM
270501±16
12