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| January 2007 rev 0.1 PCS811/PCS812 5-Pin P Voltage Supervisor with Manual Reset FEATURES * * * Ultra Low Supply Current 1A(typ.) Guaranteed Reset Valid to VCC=0.9V Available in two Output Types: Push-Pull Active Low (PCS811), Push-Pull Active High (PCS812) * * * * 140ms Min. Power-On Reset Pulse Width Internally Fixed Threshold 2.3V, 2.6V, 2.7V, 2.9V, 3.1V, 4.0V, 4.4V, and 4.6V Tight Voltage Threshold Tolerance: 1.5% Low profile Package: SOT-23-5 DESCRIPTION PCS811/PCS812 are low-power microprocessor (P) supervisory circuits used to monitor power supplies in P and digital systems. They provide applications with benefits of circuit reliability and low cost by eliminating external components. PCS811/PCS812 also offer a manual reset input. These devices perform as valid singles in applications with VCC ranging from 6.0V down to 0.9V. The reset signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset threshold. Both PCS811 and PCS812 were designed with a reset comparator to help identify invalid signals, which last less than 140ms. The only difference between them is that they have an active-low RESET output and active-high RESET output, respectively. Low supply current (1A) makes PCS811/PCS812 ideal APPLICATIONS * * * * Notebook Computers Digital Still Cameras PDAs Critical Microprocessor Monitoring RESET THRESHOLD Suffix Voltage(V) L 4.6 M 4.4 J 4.0 T 3.1 S 2.9 Q 2.7 R 2.6 P 2.3 for portable equipment. The devices are available in 5SOT-23 package Typical Operating Circuit VCC VCC PCS811 (PCS812) RESET (RESET) MR GND VCC P RESET INPUT GND Pushbutton Switch PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 * Tel: 408-879-9077 * Fax: 408-879-9018 www.pulsecoresemi.com Notice: The information in this document is subject to change without notice. January 2007 PCS811/PCS812 rev 0.1 Pin Diagram GND 1 NC 2 RESET (RESET) 3 PCS811 (PCS812) 4 5 VCC MR Pin Description Pin# PCS811 1 2 PCS812 1 2 Pin Name GND NC RESET Ground. No Connection Description RESET is asserted LOW if VCC falls below VTH. RESET remains LOW for atleast 140ms (TRST) once VCC exceeds the Threshold. In addition, RESET is active LOW as long as the manual reset (MR) is low. RESET is asserted HIGH if VCC falls below VTH. RESET remains HIGH for atleast 3 - - 3 RESET 140ms (TRST) once VCC exceeds the threshold. In addition, RESET is active HIGH as long as the manual reset (MR) is low. Manual Reset Input. A logic LOW on MR asserts reset. Reset remains active as long as MR is LOW and for at least 180ms (TMRST) once MR returns HIGH. The active low input has an internal 20k pull-up resistor. The input should be left 4 4 MR open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a switch. 5 5 VCC Power supply input voltage (3.0V, 3.3V, 5.0V) Block Diagram RESET (RESET) RESET Generator R1 RPULL_UP 20K R2 MR GND VCC Bandgap 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 2 of 8 January 2007 PCS811/PCS812 rev 0.1 DETAIL DESCRIPTION If a brownout condition occurs (VCC drops below the reset RESET OUTPUT P will be activated at a valid reset state. These P supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for VTH>VCC>0.9V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. MANUAL RESET INPUT Many P-based products require manual reset capability, allowing operators, test technicians, or external logic circuitry to initiate a reset. Logic low on MR asserts reset. Reset will remain asserted for the Reset Active Timeout Period (tRP) after MR returns high. This input has an internal 20K pull-up resistor, so it can be floating if it is not used. MR can be driven with TTL or CMOS-logic levels, or with open-drain/collector outputs. Another alternative is to connect a normal switch from MR to GND to create a manual reset function. Connecting a 0.1F capacitor from MR to ground can provide noise immunity BENEFITS THRESHOLD PCS811/812 with specified voltage as 5V10% or 3V10% are ideal for systems using a 5V5% or 3V5% power supply. The reset is guaranteed to assert after the power supply falls out of regulation, but before power drops below the minimum specified operating voltage range of the system ICs. The pre-trimmed thresholds are reducing the range over which an undesirable reset may occur. OF HIGHLY ACCURATE RESET threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer is activated after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. The manual reset input (MR) can also initiate a reset. PCS812 has an active-high RESET output that is the inverse of PCS811's RESET output.PCS811's RESET output. to prevent noise caused by long cables of MR or noisy environment. APPLICATION INFORMATION NEGATIVE-GOING VCC TRANSIENTS In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, PCS811 series are relatively resistant to short-duration negative-going VCC transient. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 When VCC falls below 0.9V, PCS811 RESET output no longer sinks current; it becomes an open circuit. In this case, high-impedance CMOS logic inputs connecting to RESET can drift to undetermined voltages. Therefore, PCS811/812 with CMOS is perfect for most applications of VCC below 0.9V. However in applications where RESET must be valid down to 0V, adding a pull-down resistor to RESET causes any leakage currents to flow to ground, holding RESET low. INTERFACING TO P WITH BIDIRECTIONAL RESET PINS Ps with bidirectional reset pins can contend with PCS811/812 reset outputs. If PCS811 RESET output is asserted high and the P wants to pull it low, indeterminate logic levels may occur. To correct such cases, connect a resistor between PCS811 RESET (or PCS812 RESET) output and the P reset I/O. Buffer the reset output to other system components. 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 3 of 8 January 2007 PCS811/PCS812 rev 0.1 Absolute Maximum Rating Parameter VCC RESET,RESET Input Current (VCC,MR) Output Current (RESET or RESET) Continuous Power Dissipation (TA=+70C) Operating Junction Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (Soldering) 10 sec -65 -40 Min 0.3 0.3 Max 6.5 Vcc+0.3 20 20 320 +85 125 150 260 Unit V V mA mA mW C C C C Test Circuit VCC TEST CIRCUIT VCC 0.1uF RESET (RESET) MR GND Pushbutton Switch 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 4 of 8 January 2007 PCS811/PCS812 rev 0.1 Electrical Characteristics: (Typical valves are at TA=+25C unless otherwise specified.) (Note1) Parameter Opreating Voltage Supply Current Symbol VCC ICC Test Conditions Min 0.9 Typ Max 6 Unit V VCC= VTH +0.1V P device R device Q device S device TA=+25C TA-40C to 85C TA=+25C TA-40C to 85C TA=+25C TA-40C to 85C TA=+25C TA-40C to 85C T device J device M device L device TA=+25C TA-40C to 85C TA=+25C TA-40C to 85C TA=+25C TA-40C to 85C TA=+25C TA-40C to 85C 2.265 2.254 2.561 2.548 2.660 2.646 2.857 2.842 3.054 3.038 3.940 3.920 4.334 4.312 4.531 4.508 1 2.3 2.6 2.7 2.9 3.1 4.0 4.4 4.6 20 140 100 0.5 0.7VCC 230 3 2.335 2.346 2.639 2.652 2.741 2.754 2.944 2.958 3.147 3.162 4.060 4.080 4.466 4.488 4.669 4.692 A RESET threshold VTH V VCC to Reset Delay Reset Active Timeout Period MR to Reset Progation delay MR Input Threshold MR Pull-up Resistance RESET output Voltage TRD TRP TMD VIH VIL VCC=VTH to (VTH-0.1V), VTH =3.1V VCC=VTH (MAX) VCC=6V TA=+25C TA-40C to 85C S 560 1030 mS S 0.25VCC V k 10 VOH VOL VOH VOL VCC = VTH +0.1V, ISOURECE =1mA VCC= VTH -0.1V, ISINK =1mA VCC = VTH +0.1V, ISOURECE =1mA VCC= VTH -0.1V, ISINK =1mA A 20 30 0.8VCC 0.2VCC 0.8VCC 0.2VCC V RESET output Voltage Note1: Specifications are production tested at T =25C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). Note 2: RESET output is for PCS811: RESET output for PCS812 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 5 of 8 January 2007 PCS811/PCS812 rev 0.1 Ordering Information Part # PCS811LIUKF PCS811MIUKF PCS811JIUKF PCS811TIUKF PCS811SIUKF PCS811QIUKF PCS811RIUKF PCS811PIUKF Threshold Voltage 4.6 4.4 4.0 3.1 2.9 2.7 2.6 2.3 4.6 4.4 4.0 3.1 2.9 2.7 2.6 2.3 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 Top Marking BQ46P BQ44P BQ40P BQ31P BQ29P BQ27P BQ26P BQ23P PCS812 ACTIVE HIGH RESET, LEAD FREE DEVICE PCS812LIUKF PCS812MIUKF PCS812JIUKF PCS812TIUKF PCS812SIUKF PCS812QIUKF PCS812RIUKF PCS812PIUKF Note: For parts to be packed in tape and reel, add "T" at the end of the part number PulseCore Semiconductor parts are RoHS Compliant. All parts are lead free by default. -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 5-SOT-23 BR46P BR44P BR40P BR31P BR29P BR27P BR26P BR23P 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 6 of 8 January 2007 PCS811/PCS812 rev 0.1 Package Information: 5L SOT 23 Package Dimensions Symbol A A1 A2 b c D E E1 L L1 e e1 Inches Min Max 0.035 0.00 0.035 0.009 0.003 0.111 0.106 0.060 0.014 0.057 0.006 0.051 0.015 0.009 0.117 0.114 0.066 0.022 Millimeters Min Max 0.95 0.05 0.90 0.30 0.08 2.80 2.60 1.50 0.30 1.45 0.15 1.30 0.50 0.22 3.00 3.00 1.70 0.60 0.023 REF 0.0256 BSC 0.0768 BSC 0 8 0.60 REF 0.95 BSC 1.90 BSC 0 8 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 7 of 8 January 2007 PCS811/PCS812 rev 0.1 PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com Copyright (c) PulseCore Semiconductor All Rights Reserved Part Number: PCS811/812 Document Version: 0.1 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued PulseCore Semiconductor, dated 11-11-2003 (c) Copyright 2007 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies. PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein represents PulseCore's best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. PulseCore does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of PulseCore products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in PulseCore's Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively according to PulseCore's Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of PulseCore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use. 5-Pin P Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 8 of 8 |
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