Shift register timing waveform, External clock drive characteristics (xtal1), External clock drive waveforms – Rainbow Electronics AT89C5122 User Manual
Page 198: Ac testing input/output waveforms, Table 120 gi, Min for a logic “1” and v, Max for a logic “0
198
AT8xC5122/23
4202E–SCR–06/06
Shift Register Timing
Waveform
External Clock Drive
Characteristics (XTAL1)
Table 120. AC Parameters
External Clock Drive
Waveforms
AC Testing Input/Output
Waveforms
AC inputs during testing are driven at V
CC
- 0.5 for a logic “1” and 0.45V for a logic “0”.
Timing measurement are made at V
IH
min for a logic “1” and V
IL
max for a logic “0”.
VALID
VALID
VALID
VALID
VALID
VALID
INPUT DATA
VALID
0
1
2
3
4
5
6
8
7
ALE
CLOCK
OUTPUT DATA
WRITE to SBUF
CLEAR RI
T
XLXL
T
QVXH
T
XHQX
T
XHDV
T
XHDX
SET TI
SET RI
INSTRUCTION
0
1
2
3
4
5
6
7
VALID
Symbol
Parameter
Min
Max
Units
T
CLCL
Oscillator Period
125
ns
T
CHCX
High Time
5
ns
T
CLCX
Low Time
5
ns
T
CLCH
Rise Time
5
ns
T
CHCL
Fall Time
5
ns
T
CHCX
/T
CLCX
Cyclic ratio in X2 mode
40
60
%
V
CC
-0.5V
0.45V
0.7V
CC
0.2V
CC
-0.1
T
CHCL
T
CLCX
T
CLCL
T
CLCH
T
CHCX
INPUT/OUTPUT
0.2 V
CC
+ 0.9
0.2 V
CC
- 0.1
V
CC
-0.5V
0.45V