AT89C5115
Shift Register Timing Waveforms
0
1
2
3
4
5
6
7
8
INSTRUCTION
TXLXL
CLOCK
TXHQX
1
TQVXH
0
2
3
4
5
6
7
OUTPUT DATA
TXHDX
VALID
SET TI
TXHDV
WRITE to SBUF
INPUT DATA
VALID
VALID
VALID
VALID
VALID
VALID
VALID
SET RI
CLEAR RI
External Clock Drive
Table 77. AC Parameters
Characteristics (XTAL1)
Symbol
TCLCL
Parameter
Oscillator Period
High Time
Low Time
Min
25
5
Max
Units
ns
TCHCX
TCLCX
TCLCH
TCHCL
ns
5
ns
Rise Time
5
5
ns
Fall Time
ns
TCHCX/TCLCX Cyclic ratio in X2 Mode
40
60
%
External Clock Drive
Waveforms
VCC-0.5V
0.7VCC
0.2VCC-0.1
0.45V
TCHCX
TCLCX
TCHCL
TCLCH
TCLCL
AC Testing Input/Output Waveforms
VCC -0.5V
0.45 V
0.2 VCC + 0.9
0.2 VCC - 0.1
INPUT/OUTPUT
AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”.
Timing measurement are made at VIH min for a logic “1” and VIL max for a logic “0”.
Float Waveforms
FLOAT
VOH - 0.1V
VOL + 0.1V
VLOAD + 0.1V
LOAD - 0.1V
VLOAD
V
101
4128F–8051–05/06
ATMEL [ ATMEL ]
