TC74 datasheet(2/16 Pages) MICROCHIP

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TC74

DS21462C-page 2

 2002 Microchip Technology Inc.

1.0

ELECTRICAL

CHARACTERISTICS

1.1

Absolute Maximum Ratings†

Supply Voltage (VDD) ............................................ +6V

Voltage On Any Pin ....... (GND – 0.3V) to (VDD + 0.3V)

Current On Any Pin ..........................................±50 mA

Operating Temperature (TA) ........ -40°C ≤ TA ≤ +125°C

Storage Temperature (TSTG)..............-65°C to +150°C

Junction Temperature (TJ)................................ +150°C

† Notice: Stresses above those listed under "Maxi-

mum Ratings" may cause permanent damage to the

device. This is a stress rating only and functional oper-

ation of the device at those or any other conditions

above those indicated in the operation listings of this

specification is not implied. Exposure to maximum rat-

ing conditions for extended periods may affect device

reliability.

DC CHARACTERISTICS

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

Power Supply

Power-on Reset Threshold

VPOR

1.2

—

2.2

VDD Falling Edge or Rising

Edge

Supply Voltage

VDD

2.7

—

5.5

Note 5

Operating Current

IDD

—

200

350

µA

VDD = 5.5V, Note 1

Standby Supply Current

IDD-STANDBY

—

5.0

µA

VDD = 3.3V

Serial Port Inactive, Note 4

Temperature-to-Bits Converter

Temperature Accuracy

TERR

-2.0

-3.0

—

±2.0

+2.0

+3.0

—

°C

+25°C <TA < +85°C

0°C < TA < +125°C

-40°C < TA < 0°C

Conversion Rate

—

SPS

Note 2

Serial Port Interface

Logic Input High

VIH

0.8 x VDD

——

Logic Input Low

VIL

—

0.2 x VDD

SDA Output Low

VOL

—

0.4

0.6

IOL = 3 mA

IOL = 6 mA, Note 3

Input Capacitance SDA, SCLK

CIN

—5.0

—

I/O Leakage

ILEAK

-1.0

0.1

1.0

µA

Serial Port AC Timing (CLOAD = 80 pF)

SMBus/I2C Clock Frequency

fSMB

—

100

kHz

Low Clock Period

tLOW

4.7

—

µsec 10% to 10%

High Clock Period

tHIGH

4.0

—

µsec 90% to 90%

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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