Philips Semiconductors
Product data
P87C51RA2/RB2/RC2/RD2
80C51 8-bit microcontroller family 8KB/16KB/32KB/64KB OTP
with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high
speed (30/33 MHz)
2003 Jan 24
52
VCC–0.5
0.45V
0.2VCC+0.9
0.2VCC–0.1
NOTE:
AC inputs during testing are driven at VCC –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’.
SU00717
Figure 39. AC Testing Input/Output
VLOAD
VLOAD+0.1V
VLOAD–0.1V
VOH–0.1V
VOL+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
VOH/VOL level occurs. IOH/IOL ≥ ±20mA.
SU00718
Figure 40. Float Waveform
SU01684
TYP ACTIVE MODE
MAX IDLE MODE
ICCMAX = 0.22
FREQ. + 1.0
TYP IDLE MODE
5
4812
16
FREQ AT XTAL1 (MHz)
20
24
28
32
36
15
25
I CC
(mA)
10
20
MAX ACTIVE MODE
ICCMAX = 1.1
FREQ. + 1.0
35
30
40
Figure 41. ICC vs. FREQ for 12-clock operation
Valid only within frequency specifications of the specified operating voltage