89C51 Datasheet, PDF (25/32 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 4K/8K/16K/32K Flash

Philips Semiconductors
80C51 8-bit microcontroller family
4K/8K/16K/32K Flash
Product specification
89C51/89C52/89C54/89C58
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’.
Figure 19. AC Testing Input/Output
SU00717
60
50
V_LOAD
V_LOAD+0.1V
V_LOAD–0.1V
TIMING
REFERENCE
POINTS
V_OH–0.1V
V_OL+0.1V
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_OH/V_OL level occurs. I_OH/I_OL ≥ ±20mA.
SU00718
Figure 20. Float Waveform
40
I_CC (mA) ₃₀
20
10
Icc MAX. ACTIVE MODE
Icc MAX ACTIVE MODE (TYP.)
Icc MAX. IDLE MODE
Icc IDLE MODE (TYP.)
4
8
12
16
20
24
28
32
36
Frequency at XTAL1 (MHz)
SU01056
Figure 21. I_CC vs. FREQ
Valid only within frequency specifications of the device under test
1999 Oct 27
25