80C251SB16 查看數據表（PDF） - Intel

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80C251SB16

HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER

VCC – 0.5

0.7 VCC

0.45 V

0.2 VCC – 0.1

TCHCL

TCLCH

TCHCX

TCLCX

TCLCL

Figure 18. External Clock Drive Waveforms

A4119-01

VCC – 0.5

0.45 V

Inputs

0.2 VCC + 0.9

0.2 VCC – 0.1

Outputs

VIH MIN

VOL MAX

AC inputs during testing are driven at VCC – 0.5V for a logic 1

and 0.45 V for a logic 0. Timing measurements are made at

a min of VIH for a logic 1 and VOL for a logic 0.

Figure 19. AC Testing Input, Output Waveforms

A4118-01

VLOAD + 0.1 V

VLOAD

VLOAD – 0.1 V

Timing Reference

Points

VOH – 0.1 V

VOL + 0.1 V

For timing purposes, a port pin is no longer floating when a

100 mV change from load voltage occurs and begins to float

when a 100 mV change from the loading VOH/VOL level occurs

with IOL/IOH = ± 20 mA.

Figure 20. Float Waveforms

A4117-01

32

PRELIMINARY

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