PCS811/PCS812 January 2007 rev 0.1 5-Pin µP Voltage Supervisor with Manual Reset FEATURES DESCRIPTION PCS811/PCS812 are low-power microprocessor (µP) • Ultra Low Supply Current 1µA(typ.) supervisory circuits used to monitor power supplies in µP • Guaranteed Reset Valid to VCC=0.9V and digital systems. They provide applications with • Available in two Output Types: Push-Pull benefits of circuit reliability and low cost by eliminating Active Low (PCS811), Push-Pull Active High external components. PCS811/PCS812 also offer a (PCS812) manual reset input. • 140ms Min. Power-On Reset Pulse Width • Internally Fixed Threshold 2.3V, 2.6V, 2.7V, These devices perform as valid singles in applications with 2.9V, 3.1V, 4.0V, 4.4V, and 4.6V VCC ranging from 6.0V down to 0.9V. The reset signal • Tight Voltage Threshold Tolerance: 1.5% lasts for a minimum period of 140ms whenever VCC • Low profile Package: SOT-23-5 supply voltage falls below preset threshold. Both PCS811 and PCS812 were designed with a reset comparator to APPLICATIONS help identify invalid signals, which last less than 140ms. • Notebook Computers The only difference between them is that they have an • Digital Still Cameras active-low RESET output and active-high RESET output, • PDAs respectively. • Critical Microprocessor Monitoring Low supply current (1µA) makes PCS811/PCS812 ideal RESET THRESHOLD Suffix Voltage(V) L 4.6 M 4.4 J 4.0 T 3.1 S 2.9 R 2.7 Q 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) VCC µP RESET INPUT MR GND 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. PCS811/PCS812 January 2007 rev 0.1 Pin Diagram GND 1 NC 2 RESET (RESET) 3 5 VCC PCS811 PCS812 4 MR Pin Description Pin# Pin Name PCS811 PCS812 1 1 GND 2 2 NC Ground. No Connection RESET 3 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 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 4 active low input has an internal 20kΩ pull-up resistor. The input should be left 4 open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a MR switch. 5 5 VCC Power supply input voltage (3.0V, 3.3V, 5.0V) Block Diagram RESET (RESET) Bandgap VCC RESET Generator R1 RPULL_UP 20K R2 MR GND 5-Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 2 of 8 PCS811/PCS812 January 2007 rev 0.1 DETAIL DESCRIPTION If a brownout condition occurs (VCC drops below the reset RESET OUTPUT threshold), RESET goes low. Any time VCC goes below µP will be activated at a valid reset state. These µP the reset threshold, the internal timer resets to zero, and supervisory circuits assert reset to prevent code execution RESET goes low. The internal timer is activated after VCC errors returns above the reset threshold, and RESET remains during power-up, power-down, or brownout conditions. low for the reset timeout period. RESET is guaranteed to be a logic low for VTH>VCC>0.9V. Once VCC exceeds the reset threshold, The manual reset input (MR) can also initiate a reset. an internal timer keeps RESET low for the reset timeout inverse of PCS811’s RESET output.PCS811’s RESET period; after this interval, RESET goes high. output. MANUAL RESET INPUT to prevent noise caused by long cables of MR or noisy Many µP-based products require manual reset capability, environment. PCS812 has an active-high RESET output that is the allowing operators, test technicians, or external logic circuitry to initiate a reset. Logic low on MR asserts reset. BENEFITS OF HIGHLY ACCURATE RESET Reset will remain asserted for the Reset Active Timeout THRESHOLD Period (tRP) after MR returns high. This input has an PCS811/812 with specified voltage as 5V±10% or internal 20KΩ pull-up resistor, so it can be floating if it is 3V±10% are ideal for systems using a 5V±5% or 3V±5% not used. MR can be driven with TTL or CMOS-logic power supply. The reset is guaranteed to assert after the levels, or with open-drain/collector outputs. Another power supply falls out of regulation, but before power alternative is to connect a normal switch from MR to GND drops below the minimum specified operating voltage to create a manual reset function. Connecting a 0.1µF range of the system ICs. The pre-trimmed thresholds are capacitor from MR to ground can provide noise immunity reducing the range over which an undesirable reset may occur. APPLICATION INFORMATION NEGATIVE-GOING VCC TRANSIENTS must be valid down to 0V, adding a pull-down resistor to In addition to issuing a reset to the µP during power-up, RESET causes any leakage currents to flow to ground, power-down, and brownout conditions, PCS811 series are holding RESET low. relatively resistant to short-duration negative-going VCC INTERFACING TO µP WITH BIDIRECTIONAL RESET transient. PINS ENSURING A VALID RESET OUTPUT DOWN TO µPs with bidirectional reset pins can contend with VCC=0 PCS811/812 reset outputs. If PCS811 RESET output is When VCC falls below 0.9V, PCS811 RESET output no asserted high and the µP wants to pull it low, longer sinks current; it becomes an open circuit. In this indeterminate logic levels may occur. To correct such case, high-impedance CMOS logic inputs connecting to cases, connect a resistor between PCS811 RESET (or RESET can drift to undetermined voltages. Therefore, PCS812 RESET) output and the µP reset I/O. Buffer the PCS811/2 with CMOS is perfect for most applications of reset output to other system components. VCC below 0.9V. However in applications where RESET 5-Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 3 of 8 PCS811/PCS812 January 2007 rev 0.1 Absolute Maximum Rating Parameter Min Max Unit VCC 0.3 6.5 V RESET,RESET 0.3 Vcc+0.3 V Input Current (VCC,MR) 20 mA Output Current (RESET or RESET) 20 mA 320 mW Continuous Power Dissipation (TA=+70) Operating Junction Temperature Range -40 +85 °C Junction Temperature -65 125 °C Storage Temperature Range 150 °C Lead Temperature (Soldering) 10 sec 260 °C Test Circuit TEST CIRCUIT VCC VCC 0.1uF RESET MR GND Pushbutton Switch 5-Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 4 of 8 PCS811/PCS812 January 2007 rev 0.1 Electrical Characteristics: (Typical valves are at TA=+25°C unless otherwise specified.) (Note1) Parameter Opreating Voltage Supply Current Symbol Test Conditions VCC ICC Typ 0.9 VCC= VTH +0.1V PCS811-23 PCS811-26 PCS811-27 PCS811-29 RESET threshold Min VTH PCS811-31 PCS811-40 PCS811-44 PCS811-46 TA=+25°C 2.265 TA-40°C to 85°C 2.254 TA=+25°C 2.561 TA-40°C to 85°C 2.548 TA=+25°C 2.660 TA-40°C to 85°C 2.646 TA=+25°C 2.857 TA-40°C to 85°C 2.842 TA=+25°C 3.054 TA-40°C to 85°C 3.038 TA=+25°C 3.940 TA-40°C to 85°C 3.920 TA=+25°C 4.334 TA-40°C to 85°C 4.312 TA=+25°C 4.531 TA-40°C to 85°C 4.508 VCC to Reset Delay TRD VCC=VTH to (VTH-0.1V), VTH =3.1V Reset Active Timeout Period TRP VCC=VTH (MAX) MR to Reset Progation delay TMD VCC=6V MR Input Threshold VIH V 1 3 μA 2.3 2.335 2.6 2.639 2.346 2.652 2.7 140 TA-40°C to 85°C 100 2.754 2.9 2.944 2.958 3.1 3.147 4.0 4.060 4.080 4.4 4.466 4.488 4.6 4.669 4.692 μS 230 560 1030 0.25VCC VOH VCC = VTH +0.1V, ISOURECE =1mA VOL VCC+ VTH -0.1V, ISINK =1mA VOH VCC = VTH +0.1V, ISOURECE =1mA VOL VCC+ VTH -0.1V, ISINK =1mA 20 mS μS 0.7VCC 10 V 3.162 0.5 MR Pull-up Resistance RESET output Voltage 2.741 20 TA=+25°C Unit 6 VIL RESET output Voltage Max 30 V kΩ 0.8VCC 0.2VCC 0.8VCC V 0.2VCC Note1: Specifications are production tested at T =25°C. Specifications over the -40°C to 85°C operating temperature range are assured A by design, characterization and correlation with Statistical Quality Controls (SQC). Note 2: RESET output is for PCS811: RESET output for PCS812 5-Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 5 of 8 PCS811/PCS812 January 2007 rev 0.1 Ordering Information Part # Threshold Voltage Temperature Range Package Top Marking 4.6 5-SOT-23 5-SOT-23 BQ46P BQ44P PCS811LEUTF PCS811MEUTF 4.4 -40°C to 85°C -40°C to 85°C PCS811JEUTF 4.0 -40°C to 85°C 5-SOT-23 BQ40P PCS811TEUTF 3.1 -40°C to 85°C 5-SOT-23 BQ31P PCS811SEUTF 2.9 -40°C to 85°C 5-SOT-23 BQ29P PCS811REUTF 2.7 -40°C to 85°C 5-SOT-23 BQ27P PCS811QEUTF 2.6 -40°C to 85°C 5-SOT-23 BQ26P PCS811PEUTF 2.3 -40°C to 85°C 5-SOT-23 BQ23P 5-SOT-23 5-SOT-23 BR46P BR44P PCS812 ACTIVE HIGH RESET, LEAD FREE DEVICE PCS812LEUTF PCS812MEUTF 4.6 4.4 -40°C to 85°C -40°C to 85°C PCS812JEUTF 4.0 -40°C to 85°C 5-SOT-23 BR40P PCS812TEUTF 3.1 -40°C to 85°C 5-SOT-23 BR31P PCS812SEUTF 2.9 -40°C to 85°C 5-SOT-23 BR29P PCS812REUTF 2.7 -40°C to 85°C 5-SOT-23 BR27P PCS812QEUTF 2.6 -40°C to 85°C 5-SOT-23 BR26P PCS812PEUTF 2.3 -40°C to 85°C 5-SOT-23 BR23P 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. 5-Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 6 of 8 PCS811/PCS812 January 2007 rev 0.1 Package Information: 5L SOT 23 Package Dimensions Symbol Inches Min Max Millimeters Min Max A 0.035 0.057 0.95 1.45 A1 0.00 0.006 0.05 0.15 A2 0.035 0.051 0.90 1.30 b 0.009 0.015 0.30 0.50 c 0.003 0.009 0.08 0.22 D 0.111 0.117 2.80 3.00 E 0.106 0.114 2.60 3.00 E1 0.060 0.066 1.50 1.70 L 0.014 0.022 0.30 0.60 L1 0.023 REF 0.60 REF e 0.0256 BSC 0.95 BSC e1 0.0768 BSC 1.90 BSC θ 0° 8° 0° 8° 5-Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 7 of 8 PCS811/PCS812 January 2007 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 © 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 © 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 µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice. 8 of 8