DataSheet.jp

MC74A3 の電気的特性と機能

MC74A3のメーカーはON Semiconductorです、この部品の機能は「Serial Digital Temperature Sensor」です。


製品の詳細 ( Datasheet PDF )

部品番号 MC74A3
部品説明 Serial Digital Temperature Sensor
メーカ ON Semiconductor
ロゴ ON Semiconductor ロゴ 




このページの下部にプレビューとMC74A3ダウンロード(pdfファイル)リンクがあります。
Total 12 pages

No Preview Available !

MC74A3 Datasheet, MC74A3 PDF,ピン配置, 機能
MC74
Serial Digital
Temperature Sensor
The MC74 is a serial digital temperature sensor suited for low cost
applications. Temperature data is converted from the integrated
thermal sensing element and made available as an 8–bit serial digital
word. Communication with the MC74 is accomplished via 2–wire
SMBus/I2C–compatible serial port. Temperature resolution is 1°C.
Conversion rate is a nominal 8 samples/sec. Power consumption is
only 200 µA (5.0 µA Standby).
Features
Temperature Range: –40°C to +125°C
Outputs Temperature as an 8–Bit Digital Word
Simple Serial Port Interface
Solid State Temperature Sensing:
±2°C Accuracy from +25°C to +85°C
±3°C Accuracy from 0°C to +125°C
3.3 V and 5.5 V Operating Range
Low Power
200 µA Operations
5.0 µA Standby Mode
Typical Applications
Thermal Protection for Hard Disk Drives and Other PC Peripherals
Low–Cost Thermostat Controls
Power Supplies
FUNCTIONAL BLOCK DIAGRAM
Internal Sensor
(Diode)
Serial Port
Interface
DS Modulator
Control
Logic
Temperature
Register
SDA
SCL
http://onsemi.com
5
1
2
3
4
SOT–23
SN SUFFIX
CASE 1212
1
5
TO–220
T SUFFIX
CASE 314D
PIN CONNECTIONS
NC 1
5 SDA
GND 2
VDD 3
4 SCL
(Top View)
SOT–23A*
NOTE: *SOT–23A is equivalent to EIAJ–SC74A
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of
this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2000
November, 2000 – Rev. 1
1
Publication Order Number:
MC74/D

1 Page





MC74A3 pdf, ピン配列
MC74
DC ELECTRICAL CHARACTERISTICS (VDD = 3.3 V or 5.0 V (Note 5.), –40°C TA 125°C, unless otherwise noted.)
Characteristic
Symbol
Min Typ Max
Power Supply
Power–On Reset Threshold
(VDD Falling Edge or Rising Edge)
VPOR
1.2 –
2.2
Operating Current
(VDD = 5.5V, Serial Port Inactive) (Note 1.)
IDD
– 200 350
Standby Supply Current
(VDD = 3.3 V, Serial Port Inactive) (Note 4.)
IDD–STANDBY
5.0 10
Temperature–to–Bits Converter
Temperature Accuracy MC74A
+25°C TA +85°C
0°C TA +125°C
–40°C TA 0°C
Conversion Rate (Note 2.)
TERR
CR
–2.0 – +2.0
–3.0 – +3.0
±2.0 –
4.0 8.0
Serial Port Interface
Logic Input High
Logic Input Low
SDA Output Low
IOL = 3 mA (Note 3.)
IOL = 6 mA (Note 3.)
VIH
0.8 x VDD
VIL – – 0.2 x VDD
VOL
– – 0.4
– – 0.6
Input Capacitance SDA, SCL
I/O Leakage
CIN
ILEAK
– 5.0
–1.0 0.1
1.0
Unit
V
mA
mA
°C
sa/sec
V
V
V
pF
mA
SERIAL PORT AC TIMING (VDD = 3.3 V or 5.0 V (Note 5.), –40°C (TA = TJ) 125°C; CL = 80 pF unless otherwise noted.)
Characteristic
Symbol
Min Typ Max
SMBus Clock Frequency
fSMB
10 – 100
Low Clock Period (10% to 10%)
tLOW
4.7 –
High Clock Period (90% to 90%)
tHIGH
4.0 –
SMBus Rise Time (10% to 90%)
tR – – 1,000
SMBus Fall Time (90% to 10%)
tF – – 300
Start Condition Setup Time (90% SCL to 10% SDA)
(for Repeated Start Condition)
tSU(START)
4.0
Unit
kHz
msec
msec
nsec
nsec
msec
Start Condition Hold Time
tH(START) 4.0 –
msec
Data in Setup Time
tSU–DATA
1,000
– nsec
Data in Hold Time
tH–DATA
1,250
– nsec
Stop Condition Setup Time
tSU(STOP)
4.0
msec
Bus Free Time Prior to New Transition
tIDLE
4.7 –
msec
Power–On Reset Delay (VDD VPOR (Rising Edge))
tPOR
– 500 – msec
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 VDD or GND.
5. VDD = 3.3 V for MC74–33SNTR. VDD = 5.0 V for MC74–50T. All part types of the MC74 will operate properly over the wider power supply
range of 2.7 V to 5.5 V. 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.
http://onsemi.com
3


3Pages


MC74A3 電子部品, 半導体
SMBUS Write Timing Diagram
SCL
AB
ILOW IHIGH
C
MC74
D EF
G
H IJ K L M
SDA
t SU(START) t H(START)
t SU–DATA
t H–DATA
t SU(STOP) t IDLE
A = Start Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master J = Acknowledge Clocked into Master
G = MSB of Data Clocked into Slave
K = Acknowledge Clock Pulse
H = LSB of Data Clocked into Slave
L = Stop Condition, Data Executed by Slave
I = Slave Pulls SDA Line Low
M= New Start Condition
SMBUS Read Timing Diagram
AB
ILOW IHIGH
C
SCL
D EF
G
HI
JK
SDA
t SU(START) t H(START)
t SU–DATA
A = Start Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master
G = MSB of Data Clocked into Master
H = LSB of Data Clocked into Master
Figure 2. Timing Diagrams
t SU(STOP) t IDLE
I = Acknowledge Clock Pulse
J = Stop Condition
K = New Start Condition
http://onsemi.com
6

6 Page



ページ 合計 : 12 ページ
 
PDF
ダウンロード
[ MC74A3 データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
MC74A0

Serial Digital Temperature Sensor

ON Semiconductor
ON Semiconductor
MC74A1

Serial Digital Temperature Sensor

ON Semiconductor
ON Semiconductor
MC74A2

Serial Digital Temperature Sensor

ON Semiconductor
ON Semiconductor
MC74A3

Serial Digital Temperature Sensor

ON Semiconductor
ON Semiconductor


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap