87C5180C51BH80C31BH

EXTERNAL DATA MEMORY WRITE CYCLE

272335-14

EXTERNAL CLOCK DRIVE

All parameter values apply to all devices unless otherwise indicated In this

table 87C51BH refers to 87C51BH 87C51-1BH-1 and 87C51-2BH-2

Symbol

Parameter

Min

Max

Units

1TCLCL

Oscillator Frequency

87C51BH

35

12

MHz

87C51-1BH-1

35

16

MHz

87C51-2BH-2

05

12

MHz

87C51-24BH-24

35

24

MHz

TCHCX

High Time

87C51BH

20

ns

8751-24BH-24

035TCLCL

065TCLCL

ns

TCLCX

Low Time

87C51BH

20

ns

87C51-24BH-24

035TCLCL

065TCLCL

ns

TCLCH

Rise Time

87C51BH

20

ns

87C51-24BH-24

10

ns

TCHCL

Fall Time

87C51BH

20

ns

87C51-24BH-24

10

ns

EXTERNAL CLOCK DRIVE WAVEFORM

272335 – 15

15