80C31 Datasheet, PDF (19/30 Pages) NXP Semiconductors – CMOS single-chip 8-bit microcontrollers

Philips Semiconductors
CMOS single-chip 8-bit microcontrollers
Product specification
80C31/80C51/87C51
V_CC–0.5
0.2V_CC+0.9
0.45V
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 6. AC Testing Input/Output
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.
Figure 7. Float Waveform
SU00010
SU00011
MAX ACTIVE MODE
(I_CCMAX = 1.43 freq + 1.9)
45
40
35
30
25
I_CC mA 20
TYP ACTIVE MODE
15
10
MAX IDLE MODE
5
TYP IDLE MODE
4MHz
8MHz 12MHz 16MHz 20MHz 24MHz
FREQ AT XTAL1
30MHz 33MHz
Figure 8. I_CC vs. FREQ
Valid only within frequency specifications of the device under test
SU00012
1996 Aug 16
19