TC74 datasheet(3/16 Pages) MICROCHIP

3 / 16 page

 2002 Microchip Technology Inc.

DS21462C-page 3

TC74

SMBus/I2C Rise Time

SMBus/I2C Fall Time

—

1000

300

nsec

10% to 90%

90% to10%

START Condition Setup Time

(for repeated START

Condition)

tSU(START)

4.0

—

µsec 90% SCLK to 10% SDA

START Condition Hold Time

tH(START)

4.0

—

µsec

Data In Setup Time

tSU-DATA

1000

—

nsec

Data In Hold Time

tH-DAT

1250

—

nsec

STOP Condition Setup Time

tSU(STOP)

4.0

—

µsec

Bus Free Time Prior to New

Transition

tIDLE

4.7

—

µsec

Power-on Reset Delay

tPOR

—500

—

µsec VDD ≥ VPOR (Rising Edge)

DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and

VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5

Parameters

Sym

Min

Typ

Max

Units

Conditions

Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may

exceed this specification.

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

3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will

cause self-heating and temperature drift error.

4: SDA and SCLK must be connected to VDD or GND.

5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. 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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