Philips Semiconductors Preliminary data
P89C51RA2/RB2/RC2/RD2xx80C51 8-bit Flash microcontroller family
8KB/16KB/32KB/64KB ISP/IAP Flash with 512B/512B/512B/1KB RAM
2002 Jul 18
61
V
CC
–0.5
0.45V
0.2V
CC
+0.9
0.2V
CC
–0.1
NOTE:
AC inputs during testing are driven at V
CC
–0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
Timing measurements are made at V
IH
min for a logic ‘1’ and V
IL
max for a logic ‘0’.
SU00717
Figure 47. AC Testing Input/Output
V
LOAD
V
LOAD
+0.1V
V
LOAD
–0.1V
V
OH
–0.1V
V
OL
+0.1V
NOTE:
TIMING
REFERENCE
POINTS
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
OH
/V
OL
level occurs. I
OH
/I
OL
≥ ±20mA.
SU00718
Figure 48. Float Waveform
4 8 12 16 20 24 28 32 36
60
50
40
30
20
10
Frequency at XTAL1 (MHz, 12-clock mode)
I
CC
(mA)
MAXIMUM IDLE
SU01631
TYPICAL I
CC
ACTIVE
89C51RA2/RB2/RC2/RD2
MAXIMUM I
CC
ACTIVE
TYPICAL IDLE
Figure 49. I
CC
vs. FREQ
Valid only within frequency specifications of the device under test
