83C451 datasheet(16/22 Pages) PHILIPS

16 / 22 page

Philips Semiconductors

Product specification

80C451/83C451/87C451

80C51 8-bit microcontroller family

4K/128 OTP/ROM/ROMless, expanded I/O

1998 May 01

VCC–0.5

0.45V

0.7VCC

0.2VCC–0.1

tCHCL

tCLCL

tCLCH

tCLCX

tCHCX

SU00009

Figure 10. External Clock Drive

VCC–0.5

0.45V

0.2VCC+0.9

0.2VCC–0.1

NOTE:

AC inputs during testing are driven at VCC –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 max for a logic ‘0’.

SU00010

Figure 11. 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 VOH/VOL level occurs. IOH/IOL ≥ ±20mA.

SU00011

Figure 12. Float Waveform

4MHz

8MHz

12MHz

16MHz

FREQ AT XTAL1

MAX ACTIVE MODE

TYP ACTIVE MODE

MAX IDLE MODE

TYP IDLE MODE

ICC mA

VALID ONLY WITHIN FREQUENCY SPECIFICATIONS OF THE DEVICE UNDER TEST.

SU00092

Figure 13. ICC vs. FREQ

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