Philips Semiconductors
Product specification
CMOS single-chip 8-bit microcontrollers
80C31/80C51/87C51
V
–0.5
CC
0.2V
0.2V
+0.9
–0.1
CC
CC
0.45V
NOTE:
AC inputs during testing are driven at V –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
CC
Timing measurements are made at V min for a logic ‘1’ and V max for a logic ‘0’.
IH
IL
SU00010
Figure 6. AC Testing Input/Output
V
V
+0.1V
V
V
–0.1V
TIMING
REFERENCE
POINTS
LOAD
OH
+0.1V
OL
V
LOAD
–0.1V
LOAD
NOTE:
For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs,
and begins to float when a 100mV change from the loaded V /V level occurs. I /I ≥ ±20mA.
OH OL
OH OL
SU00011
Figure 7. Float Waveform
MAX ACTIVE MODE
(I = 1.43 freq + 1.9)
CCMAX
45
40
35
30
TYP ACTIVE MODE
25
20
I
mA
CC
15
10
5
MAX IDLE MODE
TYP IDLE MODE
4MHz
8MHz
12MHz
16MHz
20MHz
24MHz
30MHz 33MHz
FREQ AT XTAL1
SU00012
Figure 8. I vs. FREQ
CC
Valid only within frequency specifications of the device under test
19
1996 Aug 16
NXP [ NXP ]
