T89C51RD2-DDFI-M View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

T89C51RD2-DDFI-M

0 to 40 MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

9.5.11. External Clock Drive Characteristics (XTAL1)

Symbol

TCLCL

TCHCX

TCLCX

TCLCH

TCHCL

TCHCX/TCLCX

Parameter

Oscillator Period

High Time

Low Time

Rise Time

Fall Time

Cyclic ratio in X2 mode

Min

25

5

5

40

Table 48. AC Parameters

9.5.12. External Clock Drive Waveforms

T89C51RD2

Max

5

5

60

Units

ns

ns

ns

ns

ns

%

VCC-0.5V

0.45V

0.7VCC

0.2VCC-0.1

TCHCL

TCLCX

TCLCL

TCHCX

TCLCH

9.5.13. AC Testing Input/Output Waveforms

INPUT/OUTPUT

VCC -0.5 V

0.45 V

0.2 VCC + 0.9

0.2 VCC - 0.1

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

FLOAT

VOH - 0.1 V

VOL + 0.1 V

VLOAD

VLOAD + 0.1 V

VLOAD - 0.1 V

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.

Rev. F - 15 February, 2001

84

Share Link: