EXTERNAL DATA MEMORY WRITE CYCLE
87C51 80C51BH 80C31BH
EXTERNAL CLOCK DRIVE
All parameter values apply to all devices unless otherwise indicated In this
table 87C51 BH refers to 87C51 BH 87C51-1 BH-1 and 87C51-2 BH-2
Symbol
1 TCLCL
TCHCX
TCLCX
TCLCH
TCHCL
Parameter
Oscillator Frequency
87C51 BH
87C51-1 BH-1
87C51-2 BH-2
87C51-24 BH-24
High Time
87C51 BH
8751-24 BH-24
Low Time
87C51 BH
87C51-24 BH-24
Rise Time
87C51 BH
87C51-24 BH-24
Fall Time
87C51 BH
87C51-24 BH-24
Min
35
35
05
35
20
0 35TCLCL
20
0 35TCLCL
Max
12
16
12
24
0 65TCLCL
0 65TCLCL
20
10
20
10
Units
MHz
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
EXTERNAL CLOCK DRIVE WAVEFORM
272335 – 15
272335-14
15