TC74
DS21462D-page 2 2001-2012 Microchip Technology Inc.
1.0 ELECTRICAL
CHARACTERISTICS
1.1 Absolute Maximum Ratings†
Supply Voltage (V
DD
) ............................................ +6V
Voltage On Any Pin.......(GND – 0.3V) to (V
DD
+ 0.3V)
Current On Any Pin..........................................±50 mA
Operating Temperature (T
A
)........-40°C T
A
+125°C
Storage Temperature (T
STG
) ..............-65°C to +150°C
Junction Temperature (T
J
)................................+150°C
† Notice: Stresses above those listed under "Maximum
Ratings" may cause permanent damage to the device.
This is a stress rating only and functional operation 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 rating conditions for
extended periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, V
DD
= 3.3V for TC74AX-3.3VXX and
V
DD
= 5.0V for TC74AX-5.0VXX, -40°C T
A
125°C. Note 5
Parameters Sym Min Typ Max Units Conditions
Power Supply
Power-on Reset Threshold V
POR
1.2 — 2.2 V V
DD
Falling Edge or Rising
Edge
Supply Voltage V
DD
2.7 — 5.5 V Note 5
Operating Current I
DD
— 200 350 µA V
DD
= 5.5V, Note 1
Standby Supply Current I
DD-STANDBY
— 5.0 10 µA V
DD
= 3.3V
Serial Port Inactive, Note 4
Temperature-to-Bits Converter
Temperature Accuracy T
ERR
-2.0
-3.0
—
—
—
±2.0
+2.0
+3.0
—
°C +25°C <T
A
< +85°C
0°C < T
A
< +125°C
-40°C < T
A
< 0°C
Conversion Rate CR 4 8 — SPS Note 2
Serial Port Interface
Logic Input High V
IH
0.8 x V
DD
——V
Logic Input Low V
IL
— — 0.2 x V
DD
V
SDA Output Low V
OL
—
—
—
—
0.4
0.6
V
V
I
OL
= 3 mA
I
OL
= 6 mA, Note 3
Input Capacitance SDA, SCLK C
IN
—5.0—pF
I/O Leakage I
LEAK
-1.0 0.1 1.0 µA
Serial Port AC Timing (C
LOAD
= 80 pF)
SMBus/I
2
C Clock Frequency f
SMB
10 — 100 kHz
Low Clock Period t
LOW
4.7 — — µsec 10% to 10%
High Clock Period t
HIGH
4.0 — — µsec 90% to 90%
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%
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°C/V
of V
DD
change.
