Philips Semiconductors

Preliminary specification

87C54/87C58

CMOS single-chip 8-bit microcontrollers

1996 Aug 16

3-230

VCC–0.5

0.45V

0.2VCC+0.9

0.2VCC–0.1

NOTE:

SU00717

Figure 9. AC Testing Input/Output

VLOAD

VLOAD+0.1V

VLOAD–0.1V

VOH–0.1V

VOL+0.1V

NOTE:

TIMING

REFERENCE

POINTS

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

SU00718

Figure 10. Float Waveform

30

25

20

15

10

5

4MHz

8MHz

12MHz

16MHz

FREQ AT XTAL1

MAX ACTIVE MODE

TYP ACTIVE MODE

MAX IDLE MODE

TYP IDLE MODE

ICC mA

ICCMAX = 1.50 X FREQ. + 8

0.9 X FREQ. + 2.5

35

20MHz

24MHz

40

45

SU00046