89C51 Philips Semiconductors, 89C51 Datasheet - Page 25

• Manufacturer Part Number: 89C51
• Description: 80C51 8-bit microcontroller family 4K/8K/16K/32K Flash
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1999 Oct 27
NOTE:
AC inputs during testing are driven at V
Timing measurements are made at V
80C51 8-bit microcontroller family
4K/8K/16K/32K Flash
V
CC
0.45V
–0.5
I
CC
(mA)
Figure 19. AC Testing Input/Output
60
50
40
30
20
10
0.2V
0.2V
IH
CC
CC
CC
min for a logic ‘1’ and V
+0.9
–0.1
–0.5 for a logic ‘1’ and 0.45V for a logic ‘0’.
Valid only within frequency specifications of the device under test
4
8
IL
max for a logic ‘0’.
12
SU00717
Figure 21. I
Frequency at XTAL1 (MHz)
16
25
CC
Icc MAX. ACTIVE MODE
vs. FREQ
20
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
OH
LOAD
/V
Icc MAX ACTIVE MODE (TYP.)
OL
Icc MAX. IDLE MODE
level occurs. I
V
V
24
Icc IDLE MODE (TYP.)
LOAD
LOAD
89C51/89C52/89C54/89C58
–0.1V
+0.1V
OH
Figure 20. Float Waveform
28
/I
OL
20mA.
32
SU01056
REFERENCE
TIMING
POINTS
36
Product specification
V
V
OH
OL
SU00718
+0.1V
–0.1V