PT7M1233 PERICOM | Alldatasheet
Document overview
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Technical content
Features
High accurate: 1.5% (25° C) Operating voltage range: 1.0V ~ 5.5V Operating temperature range: -40° C to + 85° C Detect voltage temperature characteristics: 2.5% TYP Output configuration: Bi-dir Reset timeout period: typical 200ms
Description
The PT7M1233/1233A series are designed to monitor power supplies in µ P and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments. The devices perform a single function: assert a reset signal whenever the V CC supply voltage falls below a preset threshold. Reset remains asserted 200ms after VCC has risen above the reset threshold. PT7M1233/1233A are bidirectional output, allowing it to monitor a pushbutton on the reset output. Pin Configuration Pin Description Name Type Description I/O Reset Output and Pushbutton Input: RST is asserted when VCC drops below voltage threshold VTH-. Active low. When other devices pull RST low, the reset condition occurs and will remain a re set timeout period at least 200ms. GND P Ground VCC P Supply Voltage. RST
2013-06-0001 PT0195-4 06/17/13 PT7M1233/1233A Supervisory Circuit Maximum Ratings (TA= -40~85º C, unless otherwise noted. Typical values are at TA = +25º C) Description Sym. Test Conditions Min Typ Max Unit Supply Voltage VCC 1.0 - 5.5 V Supply Current ICC VCC = 5.5V. No load. - - 12 µA VCC = 3.6V. No load. - - 10 µA Voltage Threshold VTH- +25C (VTH-) 0.985 VTH- (VTH-) 1.015 V -40C~85C (VTH-) 0.975 VTH- (VTH-) 1.025 V Voltage Threshold (PT7M1233A-10) VTH- +25C (VTH-) 0.985 2.88 (VTH-) 1.015 V -40C~85C (VTH-) 0.975 2.88 (VTH-) 1.025 V Voltage Threshold (PT7M1233A-15) VTH- +25C (VTH-) 0.985 2.72 (VTH-) 1.015 V -40C~85C (VTH-) 0.975 2.72 (VTH-) 1.025 V Hysteresis VHYS VTH+ - VTH- * - 50 - mV Output Driving Output low VOL IOH = 8mA, VCC = 5V - - 0.4 V IOH = 4mA, VCC = 3V - - 0.3 IOH = -50µ A, VCC = 1V - - 0.09 Note: VTH- is voltage threshold when VCC falls from high to low. VTH+ is voltage threshold when VCC rises from low to high. Note: Stresses greater than 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 these or any other condi- tions above those indicated in the operational sec- tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
2013-06-0001 PT0195-4 06/17/13 PT7M1233/1233A Supervisory Circuit Timing diagram (VCC = 1.0V to 5.5V, TA= -40~85º C, unless otherwise noted. Typical values are at TA = +25º C) Sym. Description Test Conditions Min Typ Max Unit tRS Reset Timeout Period - 140 200 280 ms tRPD Delay - - 17 - s tSEN Sensitivity - 20 - - s tPD External Pull Down Signal Pulse RST pin 1 - - s Pushbutton Debounce RST pin 140 200 280 ms Pushbutton Detect* RST pin 0.8 1.5 2.0 V *Note: RST will be asserted when it is pull down to the typical value or less. VCC VRST tRS tSEN tRStRPD RST VCC VRST tRS Uncertain state 0.8V tPD tRS External pull down signal release 0.8VCC RST Note: If tPD < tRS, the reset pulse width will be tRS; if tPD > tRS, the width will be tPD + tRS.
2013-06-0001 PT0195-4 06/17/13 PT7M1233/1233A Supervisory Circuit Block Diagram Function Description Power Monitor A microprocessor’s (µP’s) reset input starts the µP in a known state. Whenever the µ P is in an unknown state, it should be held in reset. The supervisory circuits assert reset during power -up and prevent code execution errors during power -down or brownout conditions. On power-up, once Vcc reaches about 1.0V, RST is a guaranteed logic low of 0.4V or less. As Vcc rises, RST stays low. When Vcc rises above the reset threshold V RST, an internal timer releases RST after about 200ms. RST asserts whenever Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated r eset pulse, the pulse continues for at least another 200ms. On power -down, once Vcc falls below the reset threshold, RST stays low and is guaranteed to be 0.4V or less until Vcc drops below 1V. Reset Output: Bi-direction PT7M1233 The devices provid e RST output pin for a pushbutton switch. When the devices are not in a reset cycle, it continuously monitors the RST signal for a low going edge. If an edge is detected, the devices will debounce the switch by pulling the RST line low . After the internal timer has expired, the devices will continue to monitor the RST line. If the line is still low, they will continue to monitor the line looking for a rising edge. Upon detecting a release, they will force the RST line low and hold it low for 20 0ms. PT7M1233A When an out-of-tolerance condition is detected, an internal power fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 200ms to allow the power supply and processor to stabilize. The second function of the PT7M1233A is pushbutton reset control. The PT7M1233A debounces a pushbutton closure and will generate a 200ms reset pulse upon release. T.C. Reference Reset Monitor Timing Delay Vcc GND RST VCC Resistor Divider
2013-06-0001 PT0195-4 06/17/13 PT7M1233/1233A Supervisory Circuit
Application Information
2013-06-0001 PT0195-4 06/17/13 PT7M1233/1233A Supervisory Circuit Mechanical Information TC (SOT223-3) SYMBOL MIN MAX A 1.52 1.8 A1 0 0.1 A2 1.5 1.7 b 0.66 0.82 c 0.25 0.35 D 6.2 6.4 D1 2.9 3.1 E 3.3 3.7 E1 6.83 7.07 e e1 4.5 4.7 L 0.9 1.15 θ 0° 10° PKG. DIMENSIONS(MM) 2.30BSC DOCUMENT CONTROL NO. PD-0022 REVISION: B DATE: 5/16/2011 Pericom Technology (Shanghai) Co.Ltd . 3/F., 20 Building , 481 Gui Ping Road, Shanghai,200233 Tel:(86-21)6485-0576. Fax: ( 86-21)6485-2181 DESCRIPTION: 3-Pin SOT 223 PACKAGE CODE: TC3 Note: 1) Ref: JEDEC TO-261C
2013-06-0001 PT0195-4 06/17/13 PT7M1233/1233A Supervisory Circuit
Ordering Information
Part Number Package Code Package PT7M1233-15TCE TC Lead free and Green SOT223 PT7M1233-10TCE TC Lead free and Green SOT223 PT7M1233-5TCE TC Lead free and Green SOT223 PT7M1233A-15TCE TC Lead free and Green SOT223 PT7M1233A-10TCE TC Lead free and Green SOT223 Note: E = Pb-free or Pb-free and Green Adding X Suffix= Tape/Reel Contact Pericom for availability. Function Comparison Table Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom. Item Part No. Reset Output Threshold 1 PT7M1233-15 Bi-direct, Active low 4.1V 2 PT7M1233-10 Bi-direct, Active low 4.3V 3 PT7M1233-5 Bi-direct, Active low 4.6V 4 PT7M1233A-15 Bi-direct, Active low 2.72V 5 PT7M1233A-10 Bi-direct, Active low 2.88V