?2002 Microchip Technology Inc.
DS21462C-page 3
TC74
SMBus/I
2
C Rise Time
SMBus/I
2
C Fall Time
t
R
t
F




 1000
300
nsec
nsec
10% to 90%
90% to10%
START Condition Setup Time
(for repeated START
Condition)
t
SU(START)
4.0

 
祍ec   90% SCLK to 10% SDA
START Condition Hold Time
t
H(START)
4.0

 
祍ec
Data In Setup Time
t
SU-DATA
1000

 
nsec
Data In Hold Time
t
H-DAT
1250


nsec
STOP Condition Setup Time
t
SU(STOP)
4.0


祍ec
Bus Free Time Prior to New
Transition
t
IDLE
4.7


祍ec
Power-on Reset Delay
t
POR

500

祍ec   V
DD
 e V
POR
(Rising Edge)
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, V
DD
 = 3.3V for TC74AX-3.3VXX and
V
DD
 = 5.0V for TC74AX-5.0VXX, -40癈 d T
A
d 125癈. 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 V
DD
 or GND.
5:  V
DD
 = 3.3V for TC74AX -3.3 VXX. V
DD
 = 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 V
DD
 varies from the nominal value, accuracy will degrade 1癈/V
of V
DD
 change.
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