80C51 Datasheet, PDF (27/38 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz

Philips Semiconductors
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
Product specification
80C51/87C51/80C31
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
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
35
30
25
20 ^{ICCMAX ACTIVE MODE}
(8XC51RD+)
I_CCMAX = 0.9 X FREQ + 2.1
MAX ACTIVE
MODE (EXCEPT
8XC51RD+)
I_CCMAX = 0.9 X
FREQ. + 1.1
15
TYP ACTIVE MODE
10
MAX IDLE MODE
5
TYP IDLE MODE
4
8
12 16 20 24 28 32 36
FREQ AT XTAL1 (MHz)
SU00837A
Figure 21. I_CC vs. FREQ
Valid only within frequency specifications of the device under test
2000 Jan 20
27