TC1272 MICROCHIP [Microchip Technology], TC1272 Datasheet

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TC1272

Manufacturer Part Number
TC1272
Description
3-Pin Reset Monitors for 5V Systems
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet

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Part Number
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Quantity
Price
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Features
• Precision V
• 100 msec Minimum RESET, RESET Output
• Output Valid to V
• V
• Small 3-Pin SOT-23B Package
• No External Components
Applications
• Computers
• Embedded Systems
• Battery-Powered Equipment
• Critical µP Power Supply Monitoring
Package Type
M
Duration
2003 Microchip Technology Inc.
CC
**(RESET)
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
Transient Immunity
RESET
V
CC
CC
Monitor for 5.0V Systems
1
2
3-Pin SOT-23B*
CC
= 1.2V
TC1272
TC1273
TC1274
3-Pin Reset Monitors for 5V Systems
3
TC1272/TC1273/TC1274
GND
General Description
The
system supervisor circuits designed to monitor V
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 20 µsec of V
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
V
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary out-
put, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to V
= 1.2V. The TC1274 is valid down to V
three devices are available in a 3-Pin SOT-23B
package.
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the V
Typical Operating Circuit
V
CC
CC
rises above the reset threshold. The TC1274 has
TC1272/TC1273/TC1274
TC1272
GND
V
2
3
RESET
CC
1
are
CC
DS21382B-page 1
Processor
RESET
Input
line.
CC
cost-effective
= 1.8V. All
GND
V
CC
CC
CC
CC
in

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TC1272 Summary of contents

Page 1

... TC1273 have an active-low RESET output. The TC1272 and TC1274 each have a complimentary out- put, while the TC1273 has an open-drain output. The output of the TC1272 and TC1273 is valid down 1.2V. The TC1274 is valid down to V three devices are available in a 3-Pin SOT-23B package ...

Page 2

... RPU2 Note 1: All voltages referenced to ground. 2: Measured with V 2.7 volts Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274 µsec external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1273 ...

Page 3

... 1000 V OD 100 100 1000 10000 100000 V SLEW RATE (V/ sec) CC FIGURE 2-1: V Detect to Reset CC (RESET). 2003 Microchip Technology Inc. TC1272/TC1273/TC1274 ) is defined in Figure 4-5 OD 300 200 = 2V 100 FIGURE 2-2: Comparator Overdrive. = +25° COMPARATOR OVERDRIVE (V) Reset Delays vs. ...

Page 4

... CC stage of the TC1272 is complimentary, while the output stage of the TC1273 is open-drain. DS21382B-page 4 Function RESET Output (TC1272 and TC1273) RESET Output (TC1274) Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274) Ground 3.2 RESET Output (RESET) is below the The RESET output remains high while V CC reset voltage threshold, and for 200 msec (100 msec min ...

Page 5

... APPLICATIONS INFORMATION 4.1 Operation – Power Monitor The TC1272/TC1273/TC1274 is designed to function as a voltage monitor for +5V systems. These devices provide a RESET signal to indicate that the V dropped below a preset voltage level that is selected by the suffix part number. In addition, the RESET is held active for approximately 200 ms after the power supply ...

Page 6

... TC1272/TC1273/TC1274. 4.3 RESET Signal Integrity During Power-Down The TC1272 RESET output is valid to V Below this voltage the output becomes an "open circuit" and does not sink current. This means CMOS logic inputs to the P will be floating at an undeter- mined voltage. Most digital systems are completely shut down well above this voltage ...

Page 7

... SOT-23B represents part number code + & temperature range and voltage Reset V TC1272 TC1273 CC Threshold (V) Code Code represents year and quarter code 3 represents lot ID number 4 2003 Microchip Technology Inc. TC1272/TC1273/TC1274 TC1274 Code DS21382B-page 7 ...

Page 8

... TC1272/TC1273/TC1274 3-Lead Plastic Small Outline Transistor (TT) (SOT23 Dimension Limits Number of Pins Pitch Outside lead pitch (basic) Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top ...

Page 9

... Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. 2003 Microchip Technology Inc. TC1272/TC1273/TC1274 /XX Examples: Package a) TC1272-10ENBTR: 4.37V Reset b) TC1272-15ENBTR: 4.12V Reset c) TC1272-5ENBTR: a) TC1273-10ENBTR: 4.37V Reset b) TC1273-15ENBTR: 4.12V Reset c) TC1273-5ENBTR: a) TC1274-10ENBTR: 4.37V Reset b) TC1274-15ENBTR: 4 ...

Page 10

... TC1272/TC1273/TC1274 NOTES: DS21382B-page 10 2003 Microchip Technology Inc. ...

Page 11

Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families ...

Page 12

M W ORLDWIDE AMERICAS Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Atlanta 3780 Mansell Road, Suite 130 Alpharetta, GA 30022 Tel: 770-640-0034 Fax: 770-640-0307 Boston 2 Lan Drive, ...

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