TC1278 Datasheet, PDF (2/12 Pages) Microchip Technology – 3-Pin Reset Monitors for 5V Systems

TC1278/TC1279
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (V_CC to GND) ..............................+6.0V
RESET, RESET...........................-0.3V to (V_CC + 0.3V)
Input Current, V_CC ...............................................20mA
Output Current, RESET....................................... 20mA
Power Dissipation (T_A ≤ 70°C)
3-Pin SOT-23B (derate 4mW/°C above +70°C)
................................................................. 230mW
Operating Temperature Range............. -40°C to +85°C
Storage Temperature Range .............. -65°C to +150°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1278/TC1279 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: T_A = -40°C to +85°C unless otherwise noted. Typical values are at T_A = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Device
Test Conditions
V_CC
Supply Voltage
1.2
—
5.5 V
Note 1
DC Electrical Characteristics: T_A = -40°C to +85°C unless otherwise noted. Typical values are at T_A = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Test Conditions
V_OL
Low Level @ RESET
RESET
—
—
0.4 V TC1278
TC1279
Note 1
I_OL
Output Current @ 0.4 Volts
+8
—
— mA
Note 2
I_CC1
Operating Current
—
0.9
2.0 mA TC1278
—
—
40 µA TC1279
V_CC > V_CCTP(MAX)
V_CC > V_CCTP(MAX)
I_CC2
Operating Current
—
—
40 µA TC1278
—
0.9
2.0 mA TC1279
V_CC < V_CCTP(MIN)
V_CC < V_CCTP(MIN)
V_CCTP-5 V_CC Trip Point (TC1278/9-5)
4.50
4.625 4.74 V
Note 1
V_CCTP-10 V_CC Trip Point (TC1278/9-10)
4.25
4.375 4.49 V
Note 1
V_CCTP-15 V_CC Trip Point (TC1278/9-15)
4.00
4.125 4.24 V
Note 1
C_OUT Output Capacitance
—
9
— pF
R_P
Internal Pull-Up Resistor
3
6
9 kΩ
AC Electrical Characteristics: T_A = -40°C to +85°C unless otherwise noted. Typical values are at T_A = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Test Conditions
t_RST
t_RPD1
t_RPD2
t_F
RESET Active Time
V_CC Detect to RESET
V_CC Detect to RESET
V_CC Slew Rate
(4.75V-4.00V)
250
350
450 msec
—
2
5 µsec TC1279
—
2
5 µsec TC1278
300
—
— µsec
Figure 3-2
Figure 3-4
Figure 3-2, Figure 3-4
t_R
V_CC Slew Rate
(4.00V-4.75V)
0
—
— nsec
Figure 3-1, Figure 3-3
t_RPU1 V_CC Detect to RESET
250
350
450 msec TC1279
Figure 3-1
t_RPU2 V_CC Detect to RESET
250
350
450 msec TC1278
Figure 3-3
Note 1: All voltages referenced to ground.
2: A 1kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using
the TC1279. V_CC = 1.8V.
DS21384B-page 2
© 2002 Microchip Technology Inc.