TC74A5 Microchip Technology, TC74A5 Datasheet - Page 4

• Manufacturer Part Number: TC74A5
• Description: Tiny Serial Digital Thermal Sensor
• Manufacturer: Microchip Technology

TC74
TC74 ELECTRICAL SPECIFICATIONS (CONTINUED)
DS21462B-page 4
Electrical Characteristics: V
Serial Port AC Timing
f
t
t
t
t
t
t
t
t
t
t
t
Note
SMB
LOW
HIGH
R
F
SU(START)
H(START)
SU-DATA
H-DATA
SU(STOP)
IDLE
POR
Symbol
1:
2:
3:
4:
5:
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 V
V
supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As V
the nominal value, accuracy will degrade 1°C/V of V
Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.
DD
= 3.3V for TC74X -3.3VCT. V
SMBus Clock Frequency
Low Clock Period
High Clock Period
SMBus Rise Time
SMBus Fall Time
START Condition Setup Time
(for repeated START Condition)
START Condition Hold Time
Data In Setup Time
Data In Hold Time
STOP Condition Setup Time
Bus Free Time Prior to New Tran-
sition
Power-on Reset Delay
Parameter
DD
= 3.3V or 5.0V (Note 5), -40°C ≤ T
DD
= 5.0V for TC74X -5.0VCT. All part types of the TC74 will operate properly over the wider power
DD
or GND.
1000
1250
Min
4.7
4.7
10
—
—
—
4
4
4
4
DD
change.
Typ.
500
—
—
—
—
—
—
—
—
—
—
—
A
≤ 125°C, C
Max
1000
300
100
—
—
—
—
—
—
—
—
—
L
= 80pF unless otherwise noted.
µsec
µsec
nsec
nsec
µsec
µsec
nsec
nsec
µsec
µsec
µsec
Unit
kHz
10% to 10%
90% to 90%
10% to 90%
90% to10%
90% SCLK to 10% SDA
V
DD
©
2002 Microchip Technology Inc.
≥ V
POR
Test Conditions
(Rising Edge)
DD
varies from