Datasheet > MC74

MC74

更新时间： 2022-11-26 15:22:55

品牌	Logo	应用领域
安森美 - ONSEMI		传感器温度传感器
页数	文件大小	规格书
12页	126K
描述
Serial Digital Temperature Sensor

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数据手册

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MC74 数据手册

MC74

(5)

= 3.3 V or 5.0V , –40°C ≤ T ≤ 125°C, unless otherwise noted.)

DC ELECTRICAL CHARACTERISTICS (V

Characteristic

Symbol

Min

Typ

Max

Unit

Power Supply

Power–On Reset Threshold

(V Falling Edge or Rising Edge)

POR

1.2

—

200

5.0

2.2

350

Operating Current

(V = 5.5V, Serial Port Inactive)

(1)

Standby Supply Current

(V = 3.3 V, Serial Port Inactive)

DD–STANDBY

(4)

—

Temperature–to–Bits Converter

Temperature Accuracy MC74A

+25°C ≤ T ≤ +85°C

ERR

°C

–2.0

–3.0

—

±2.0

+2.0

+3.0

—

0°C ≤ T ≤ +125°C

–40°C ≤ T ≤ 0°C

(2)

Conversion Rate

4.0

8.0

—

sa/sec

Serial Port Interface

Logic Input High

Logic Input Low

0.8 x V

—

0.2 x V

SDA Output Low

(3)

—

0.4

0.6

= 3 mA

= 6 mA

(3)

Input Capacitance SDA, SCL

I/O Leakage

—

5.0

0.1

—

–1.0

1.0

LEAK

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

2. Maximum guaranteed 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 MC74 will cause self–heating and

temperature drift error.

4. SDA and SCL must be connected to V

or GND.

=5.0VforMC74A5–50T. AllparttypesoftheMC74willoperateproperlyoverthewiderpowersupply

5. V

=3.3VforMC74A5–33SNTR. V

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

varies from the nominal

value, accuracy will degrade 1°C/V of V

change.

SERIAL PORT AC TIMING (V

= 3.3 V or 5.0V, –40°C ≤ (T = T ) ≤ 125°C; C = 80 pF unless otherwise noted.)

A J L

Symbol

Characteristic

SMBus Clock Frequency

Min

Typ

—

Max

100

—

Unit

kHz

sec

SMB

Low Clock Period (10% to 10%)

High Clock Period (90% to 90%)

SMBus Rise Time (10% to 90%)

SMBus Fall Time (90% to 10%)

4.7

4.0

—

LOW

—

sec

HIGH

—

1,000

300

—

nsec

sec

—

Start Condition Setup Time (90% SCL to 10% SDA)

(for Repeated Start Condition)

4.0

—

SU(START)

Start Condition Hold Time

Data in Setup Time

4.0

1,000

1,250

4.0

—

sec

nsec

sec

H(START)

SU–DATA

H–DATA

SU(STOP)

IDLE

Data in Hold Time

—

Stop Condition Setup Time

Bus Free Time Prior to New Transition

—

4.7

—

sec

Power–On Reset Delay (V

≥ V

DD POR

(Rising Edge))

—

500

sec

POR

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