TC1279-5ENBTR Microchip Technology, TC1279-5ENBTR Datasheet

IC RESET MONITOR 4.625V SOT23B-3

TC1279-5ENBTR

Manufacturer Part Number
TC1279-5ENBTR
Description
IC RESET MONITOR 4.625V SOT23B-3
Manufacturer
Microchip Technology
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of TC1279-5ENBTR

Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
250 ms Minimum
Voltage - Threshold
4.625V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
TC12795ENBTR
Features
• Precision V
• 250 ms Minimum RESET Output Duration
• Output Valid to V
• V
• Small 3-Pin SOT-23 Package
• No External Components
• Internal Pull-up Resistor
• Available in 3 different voltage detection levels:
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
Typical Operating Circuit
© 2007 Microchip Technology Inc.
V
- 4.625V (typ.), -5 suffix
- 4.375V (typ.), -10 suffix
- 4.125V (typ.), -15 suffix
CC
CC
TC1278 has an active-high RESET output.
Transient Immunity
V
REF
CC
Monitor for 5.0V System Supplies
CC
= 1.2V
3-Pin Reset Monitors for 5V Systems
+
TC1279
Internal
Pull-up
6 kΩ
Resistor
GND
RESET
TC1278/TC1279
General Description
The TC1278/TC1279 are cost-effective system super-
visor circuits designed to monitor V
and provide a reset signal to the host processor when
necessary. No external components are required. The
open-drain output uses an internal pull-up resistor of
approximately 6 kΩ.
The reset output is driven active within 5 µs of V
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250 ms after V
rises above the reset threshold. The TC1278 has an
active-high RESET output, while the TC1279 has an
active-low RESET output, with both devices having an
open-drain output stage. The output is valid down to
V
SOT- 23 package.
Package Type
CC
(TC1278) RESET
(TC1279) RESET
= 1.2V. Both devices are available in a 3-Pin
Obsolete Device
V
CC
3-Pin SOT-23
2
1
TC1278
TC1279
CC
in digital systems
DS21384D-page 1
3
GND
CC
CC

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TC1279-5ENBTR Summary of contents

Page 1

... RESET is maintained active for a minimum of 250 ms after V rises above the reset threshold. The TC1278 has an active-high RESET output, while the TC1279 has an active-low RESET output, with both devices having an open-drain output stage. The output is valid down ...

Page 2

... Note 1: All voltages referenced to ground kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1279 Operating current is specified with the open-drain output in the active (“ON”) condition. 4: Operating current is specified with the open-drain output in the non-active (“OFF”) condition. ...

Page 3

... Slew Rate (4.00V-4.75V Detect to RESET t CC RPU1 (TC1279) V Detect to RESET t CC RPU2 (TC1278) © 2007 Microchip Technology Inc. TC1278/TC1279 = -40°C to +85°C. Typical values are Min Typ Max Units 250 350 450 ms — µs Figure 3-2 — µs Figure 3-4 300 — ...

Page 4

... RESET output remains low while V CC reset voltage threshold, and for 350 ms (250 ms min.) after V rises above reset threshold. The output stage CC of the TC1279 is open-drain. 2.2 RESET (TC1278) RESET output remains high while V CC reset voltage threshold, and for 350 ms (250 ms min.) after V rises above reset threshold ...

Page 5

... APPLICATIONS INFORMATION 3.1 Operation – Power Monitor The TC1278/TC1279 provide the function of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When V is detected as out-of-tolerance, the RESET CC signal is asserted. On power-up, RESET is kept active for approximately 350 ms after the power supply has reached the selected tolerance ...

Page 6

... TC1278/TC1279 3.2 V Transient Rejection CC The TC1278/TC1279 provides accurate V ing and reset timing during power-up, power-down, and brownout/sag conditions. Furthermore, it rejects negative-going transients (glitches) on the power supply line. Figure 3-5 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive that lays under the curve will not generate a reset signal ...

Page 7

... PACKAGING INFORMATION 4.1 Package Marking Information 3-Pin SOT- & = part number code + temperature range 1 2 and voltage Part Number TC1278-5ENB TC1278-10ENB TC1278-15ENB TC1279-5ENB TC1279-10ENB TC1279-15ENB represents year and 2-month code 3 represents production lot ID code 4 © 2007 Microchip Technology Inc. TC1278/TC1279 Code DS21384D-page 7 ...

Page 8

... TC1278/TC1279 3-Lead Plastic Small Outline Transistor (TT or NB) [SOT-23] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging Number of Pins Lead Pitch Outside Lead Pitch Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width ...

Page 9

... E = -40°C to +85°C Package NBTR = Plastic Small Outline Transistor, (SOT23), 3-lead (Tape and Reel) © 2007 Microchip Technology Inc. TC1278/TC1279 Examples TC1278-5ENBTR: 4.625 Reset Package b) TC1278-10ENBTR: 4.375 Reset c) TC1278-15ENBTR: 4.125 Reset a) TC1279-5ENBTR: 4.625 Reset b) TC1279-10ENBTR: 4.375 Reset c) TC1279-15ENBTR: 4.125 Reset . DS21384D-page 9 ...

Page 10

... TC1278/TC1279 NOTES: DS21384D-page 10 © 2007 Microchip Technology Inc. ...

Page 11

... Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. ...

Page 12

... Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2007 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...

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