8051AH Datasheet, PDF (13/21 Pages) Intel Corporation – MCS51 8-BIT CONTROL-ORIENTED MICROCONTROLLERS

MCS@51 CONTROLLER
EXTERNAL CLOCK DRIVE
Symbol
Parameter
Min
Max
1 ^Units
1/TCLCL
Oscillator Frequency (except 8751H-8)
3.5
12
MHz
8751 H-8
3.5
8
MHz
TCHCX
High Time
20
ns
TCLCX
I TCLCH
Low Time
I Rise Time
20
ns
I
I 20 I
ns
I
TCHCL
Fall Time
20
ns
EXTERNAL CLOCK DRIVE WAVEFORM
—
2.5 t
TCHCX —
a
TCLCH _
—
t 2.5
—
A
~ TCliCL
-— TCLCX —
+
TCLCL
AC TESTING INPUT, OUTPUT WAVEFORM
2.4
2.0
2.0
TEST POINTS
><
0.s
0.8
0.45
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AC Testing: Inputs are driven at 2.4V for a Logic “1” and 0.45V
for a Logic “O”. Timing measurements ara made at 2.OV for a
Logic “1” and 0.8V for a Logic“O”.
w
272318-9