AT89C5132-ROTIL datasheet(173/181 Pages) ATMEL

Nome de Peças	AT89C5132-ROTIL

Descrição Electrónicos	USB Microcontroller with 64K Bytes Flash Memory

PDF	181 Pages

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Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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173 / 181 page

173

4173D–USB–02/06

AT89C5132

24.2.9.2

Timings

Table 124. External Clock AC Timings

DD = 2.7 to 3.3V, TA= -40 to +85°C

24.2.9.3

Waveforms

Figure 24-23. External Clock Waveform

Figure 24-24. AC Testing Input/Output Waveforms

Notes:

1. During AC testing, all inputs are driven at

DD -0.5V for a logic 1 and 0.45V for a logic 0.

2. Timing measurements are made on all outputs at VIH min for a logic 1 and VIL max for a logic 0.

Figure 24-25. Float Waveforms

Note:

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.

Symbol

Parameter

Min

Max

Unit

CLCL

Clock Period

CHCX

High Time

CLCX

Low Time

CLCH

Rise Time

CHCL

Fall Time

Cyclic Ratio in X2 Mode

0.45 V

CLCL

DD - 0.5

IH1

CHCX

CLCH

CHCL

CLCX

0.45 V

DD - 0.5

0.7

0.3

IH min

IL max

INPUTS

OUTPUTS

LOAD

OH - 0.1V

OL + 0.1V

LOAD + 0.1V

LOAD - 0.1V

Timing Reference Points

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