AT89C5131-RDTIL datasheet(163/176 Pages) ATMEL

163 / 176 page

163

AT89C5131

4136B–USB–09/03

Shift Register Timing Waveform

External Clock Drive

Characteristics (XTAL1)

Table 121. AC Parameters

External Clock Drive

Waveforms

AC Testing Input/Output

Waveforms

AC inputs during testing are driven at V

CC - 0.5 for a logic “1” and 0.45V for a logic “0”.

Timing measurement are made at V

IH min for a logic “1” and VIL max for a logic “0”.

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 ≥ ±20 mA.

VALID

INPUT DATA

VALID

ALE

CLOCK

OUTPUT DATA

WRITE to SBUF

CLEAR RI

XLXL

QVXH

TXHQX

XHDV

XHDX

SET TI

SET RI

INSTRUCTION

2345

VALID

Symbol

Parameter

Min

Max

Units

CLCL

Oscillator Period

CHCX

High Time

CLCX

Low Time

CLCH

Rise Time

CHCL

Fall Time

CHCX/TCLCX

Cyclic ratio in X2 mode

VCC-0.5V

0.45V

0.7V

0.2VCC-0.1

CHCL

CLCX

CLCL

CLCH

CHCX

INPUT/OUTPUT

0.2 V

CC + 0.9

0.2 V

CC - 0.1

CC -0.5V

0.45V

FLOAT

OH - 0.1 V

OL + 0.1 V

VLOAD

LOAD + 0.1 V

LOAD - 0.1 V

AT89C5131-RDTIL Datasheet(PDF) 163 Page - ATMEL Corporation

AT89C5131-RDTIL Datasheet(HTML) 163 Page - ATMEL Corporation

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