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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1278 Datasheet

(TC1279) 3-Pin Reset Monitors for 5V Systems

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TC1278 pdf
TC1278/TC1279
3-Pin Reset Monitors for 5V Systems
Features
• Precision VCC Monitor for 5.0V System Supplies
• 250msec Minimum RESET Output Duration
• Output Valid to VCC = 1.2V
• VCC Transient Immunity
• Small 3-Pin SOT-23B Package
• No External Components
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
Critical µP Power Supply Monitoring
Device Selection Table
Part
Number
Order
Package
Temp.
Range
TC1278-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C
TC1279-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C
NOTE: “x” denotes a suffix for VCC threshold (see table below).
Suffix
5
10
15
Package Type
Reset VCC Threshold (V)
4.625
4.375
4.125
3-Pin SOT-23B
General Description
The TC1278/TC1279 are cost-effective system super-
visor circuits designed to monitor VCC in digital systems
and provide a reset signal to the host processor when
necessary. No external components are required.
The reset output is driven active within 5µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250msec after VCC
rises above the reset threshold. The TC1278 has an
active-high RESET output while the TC1279 has an
active-low RESET output, and both devices have an
open drain output stage. The output is valid down to
VCC = 1.2V. Both devices are available in a 3-Pin SOT-
23B package.
Typical Operating Circuit
VCC
2
VCC
1
RESET
VCC
Processor
RESET
Input
TC1279
GND
3
GND
RESET 1
TC1278-xENB
TC1279-xENB 3 GND
VCC 2
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
© 2002 Microchip Technology Inc.
DS21384B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1278 Datasheet

(TC1279) 3-Pin Reset Monitors for 5V Systems

No Preview Available !

TC1278 pdf
TC1278/TC1279
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (VCC to GND) ..............................+6.0V
RESET, RESET...........................-0.3V to (VCC + 0.3V)
Input Current, VCC ...............................................20mA
Output Current, RESET....................................... 20mA
Power Dissipation (TA 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: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min
Typ Max Units
Device
Test Conditions
VCC Supply Voltage
1.2 — 5.5 V
Note 1
DC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min Typ Max Units
Test Conditions
VOL Low Level @ RESET
RESET
— — 0.4 V TC1278
TC1279
Note 1
IOL Output Current @ 0.4 Volts
+8 — — mA
Note 2
ICC1 Operating Current
— 0.9 2.0 mA TC1278
— — 40 µA TC1279
VCC > VCCTP(MAX)
VCC > VCCTP(MAX)
ICC2 Operating Current
— — 40 µA TC1278
— 0.9 2.0 mA TC1279
VCC < VCCTP(MIN)
VCC < VCCTP(MIN)
VCCTP-5 VCC Trip Point (TC1278/9-5)
4.50 4.625 4.74 V
Note 1
VCCTP-10 VCC Trip Point (TC1278/9-10)
4.25
4.375 4.49 V
Note 1
VCCTP-15 VCC Trip Point (TC1278/9-15)
4.00
4.125 4.24 V
Note 1
COUT Output Capacitance
— 9 — pF
RP Internal Pull-Up Resistor
3 6 9 k
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min Typ Max Units
Test Conditions
tRST
tRPD1
tRPD2
tF
RESET Active Time
VCC Detect to RESET
VCC Detect to RESET
VCC 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
tR VCC Slew Rate
(4.00V-4.75V)
0 — — nsec
Figure 3-1, Figure 3-3
tRPU1 VCC Detect to RESET
250 350 450 msec TC1279
Figure 3-1
tRPU2 VCC Detect to RESET
250 350 450 msec TC1278
Figure 3-3
Note 1: All voltages referenced to ground.
2: A 1kexternal resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using
the TC1279. VCC = 1.8V.
DS21384B-page 2
© 2002 Microchip Technology Inc.


Part Number TC1278
Description (TC1279) 3-Pin Reset Monitors for 5V Systems
Maker Microchip Technology
Total Page 12 Pages
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