COM20020 datasheet(49/72 Pages) SMSC

49 / 72 page

OPERATIONAL DESCRIPTION

MAXIMUM GUARANTEED RATINGS*

Operating Temperature Range ................................................................................................. -40

oC to +85oC

Storage Temperature Range .................................................................................................. -55

oC to +150oC

Lead Temperature (soldering, 10 seconds)..........................................................................................+325

Positive Voltage on any pin, with respect to ground ......................................................................... VDD+0.3V

Negative Voltage on any pin, with respect to ground ...............................................................................-0.3V

Maximum VDD ............................................................................................................................................. +7V

*Stresses above those listed may cause permanent damage to the device. This is a stress rating only and

functional operation of the device at these or any other condition above those indicated in the operational

sections of this specification is not implied.

Note: When powering this device from laboratory or system power supplies, it is important that the

Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit

voltage spikes or "glitches" on their outputs when the AC power is switched on or off. In addition, voltage

transients on the AC power line may appear on the DC output. If this possibility exists it is suggested that

a clamp circuit be used.

DC ELECTRICAL CHARACTERISTICS

VDD=3.3V±0.3V

TA=-40

oC to +85oC

PARAMETER

SYMBOL

MIN

TYP

MAX

UNIT

COMMENT

Low Input Voltage 1

(All inputs except A2,

XTAL1, nRESET, nRD,

nWR, and RXIN)

High Input Voltage 1

(All inputs except A2,

XTAL1, nRESET, nRD,

nWR, and RXIN)

VIL1

VIH1

2.0

0.8

TTL Levels

Low Input Voltage 2

(XTAL1)

High Input Voltage 2

(XTAL1)

VIL2

VIH2

2.4

1.0

TTL Clock Input

Low to High Threshold

Input Voltage

(A2, nRESET, nRD, nWR,

and RXIN)

High to Low Threshold

Input Voltage

(A2, nRESET, nRD, nWR,

and RXIN)

VILH

VIHL

1.8

1.2

Schmitt Trigger,

All Values at VDD =

3.3V

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