ADUC812 datasheet(21/31 Pages) AD

номер детали	ADUC812

подробное описание детали	MicroConverter?? Multichannel 12-Bit ADC with Embedded FLASH MCU

PDF	31 Pages

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производитель	AD [Analog Devices]

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REV. 0

ADuC812

–21–

AVDD = DVDD = +3.0 V or 5.0 V

10%. All specifications TA = TMIN to TMAX unless otherwise noted.

12 MHz

Variable Clock

Parameter

Min

Typ

Max

Min

Typ

Max

Units

Figure

CLOCK INPUT (External Clock Driven XTAL1)

tCK

XTAL1 Period

83.33

62.5

1000

tCKL

XTAL1 Width Low

tCKH

XTAL1 Width High

tCKR

XTAL1 Rise Time

tCKF

XTAL1 Fall Time

tCYC

ADuC812 Machine Cycle Time

12tCK

µs

NOTES

1AC inputs during testing are driven at DV

DD – 0.5 V for a Logic 1 and 0.45 V for a Logic 0. Timing measurements are made at V IH min for a Logic 1 and VIL max for

a Logic 0.

2For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to float when a 100 mV change from the

loaded VOH/VOL level occurs.

LOAD for Port0, ALE, PSEN outputs = 100 pF; CLOAD for all other outputs = 80 pF unless otherwise noted.

4ADuC812 Machine Cycle Time is nominally defined as MCLKIN/12.

tCKL

tCKF

tCK

tCKH

tCKR

Figure 20. XTAL 1 Input

VCC – 0.5V

0.45V

0.2VCC + 0.9V

TEST POINTS

0.2VCC – 0.1V

VLOAD – 0.1V

VLOAD

VLOAD + 0.1V

TIMING

REFERENCE

POINTS

VLOAD – 0.1V

VLOAD

VLOAD – 0.1V

Figure 21. Timing Waveform Characteristics

TIMING SPECIFICATIONS1, 2, 3

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