T89C51RD2-3CWC-L datasheet(84/86 Pages) ATMEL

Part #	T89C51RD2-3CWC-L

Description	0 to 40MHz Flash Programmable 8-bit Microcontroller

PDF	86 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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84 / 86 page

Rev. F - 15 February, 2001

T89C51RD2

9.5.11. External Clock Drive Characteristics (XTAL1)

Table 48. AC Parameters

9.5.12. External Clock Drive Waveforms

9.5.13. AC Testing Input/Output Waveforms

AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”. Timing measurement

are made at VIH min for a logic “1” and VIL max for a logic “0”.

9.5.14. Float Waveforms

For timing purposes as 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 loaded VOH/VOL level occurs. IOL/IOH ≥± 20mA.

Symbol

Parameter

Min

Max

Units

TCLCL

Oscillator Period

TCHCX

High Time

TCLCX

Low Time

TCLCH

Rise Time

TCHCL

Fall Time

TCHCX/TCLCX

Cyclic ratio in X2 mode

VCC-0.5V

0.45V

0.7VCC

0.2VCC-0.1

TCHCL

TCLCX

TCLCL

TCLCH

TCHCX

INPUT/OUTPUT

0.2 VCC + 0.9

0.2 VCC - 0.1

VCC -0.5 V

0.45 V

FLOAT

VOH - 0.1 V

VOL + 0.1 V

VLOAD

VLOAD + 0.1 V

VLOAD - 0.1 V

T89C51RD2-3CWC-L Datasheet(PDF) 84 Page - ATMEL Corporation

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