Philips Semiconductors

Product specification

80C528/83C528

CMOS single-chip 8-bit microcontrollers

1995 Feb 02

18

VDD–0.5

0.45V

0.7VDD

0.2VDD–0.1

Figure 6. External Clock Drive

VDD–0.5

0.45V

0.2VDD+0.9

0.2VDD–0.1

NOTE:

Figure 7. AC Testing Input/Output

VLOAD

VLOAD+0.1V

VLOAD–0.1V

VOH–0.1V

VOL+0.1V

NOTE:

Figure 8. Float Waveform

TIMING

REFERENCE

POINTS

AC inputs during testing are driven at VDD –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 for a logic ’0’.

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/