TC74 datasheet(4/16 Pages) MICROCHIP

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TC74

DS21462B-page 4

TC74 ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: VDD =3.3V or 5.0V (Note 5),-40°C ≤ TA ≤ 125°C, CL = 80pF unless otherwise noted.

Serial Port AC Timing

Symbol

Parameter

Min

Typ.

Max

Unit

Test Conditions

fSMB

SMBus Clock Frequency

—

100

kHz

tLOW

Low Clock Period

4.7

—

µsec

10% to 10%

tHIGH

High Clock Period

—

µsec

90% to 90%

SMBus Rise Time

SMBus Fall Time

—

1000

300

nsec

10% to 90%

90% to10%

tSU(START)

START Condition Setup Time

(for repeated START Condition)

4—

—

µsec

90% SCLK to 10% SDA

tH(START)

START Condition Hold Time

—

µsec

tSU-DATA

Data In Setup Time

1000

—

nsec

tH-DATA

Data In Hold Time

1250

—

nsec

tSU(STOP)

STOP Condition Setup Time

—

µsec

tIDLE

Bus Free Time Prior to New Tran-

sition

4.7

—

µsec

tPOR

Power-on Reset Delay

—

500

—

µsec

VDD ≥ VPOR (Rising Edge)

Note

Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.

Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec.

Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and

temperature drift error.

SDA and SCLK must be connected to VDD or GND.

VDD = 3.3V for TC74X -3.3VCT. VDD = 5.0V for TC74X -5.0VCT. All part types of the TC74 will operate properly over the wider power

supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from

the nominal value, accuracy will degrade 1°C/V of VDD change.

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