CM3403 Micropower Supply Voltage Supervisor (SVS) Features Product Description • • • • • The CM3403 is a micropower low voltage supply supervisor designed to provide the necessary poweron reset control for microprocessors and memory applications. An internal pull-down resistor on the RESET output ensures the output remains valid under all supply conditions. Precision voltage sensor Two threshold options: 2.93V or 4.63V Stable over temperature Valid output logic while VCC = 0V. Power-on reset pulse width of 140ms (min.) to 460ms (max.) Low quiescent current (40µA typ.) No external components required 3-pin SOT23 package "809" compatible pinout Lead-free versions available • • • • • During either a cold-start power-up or a complete power-down sequence, the RESET output will remain at 0V while the VCC input voltage is between the threshold level and ground. When the VCC input exceeds the preset threshold voltage, an internal timer is triggered and the RESET output remains active for a minimum of 140ms, at which point the output is taken inactive. Applications • • • Critical µP and µC power monitoring PCI applications Memory integrity during "brownouts" In the event of a "brown-out" condition and the VCC voltage collapses below the threshold the RESET output is immediately asserted. Both the trigger threshold and the precision delay pulse are internally controlled eliminating the requirement for external components. The CM3403 is housed in a 3-pin SOT23 package and is available with optional lead-free finishing. Typical Application Circuit Simplified Electrical Schematic VIN CM3403 + VCC Microprocessor VCC RESET GND RESET Rising Edge Delay Threshold Reference VCC RESET RPULLDOWN GND GND © 2004 California Micro Devices Corp. All rights reserved. 10/29/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 1 CM3403 PACKAGE / PINOUT DIAGRAM Top View GND 1 17xx RESET 3 VCC 2 3-pin SOT23 Note: This drawing is not to scale. PIN DESCRIPTIONS PIN(S) NAME 1 GND 2 RESET 3 VCC DESCRIPTION Negative reference for all signals. Active low reset output. When the sense threshold has been exceeded, the RESET signal will remain active for an additional 140ms (min.) after which it becomes inactive. During a "brownout" condition, RESET will immediately become active. Internal circuitry ensures RESET will remain active even when the supply voltage is as low as 0V. Supply input signal which is monitored by the sense comparator. This input is compared to the 2.93V (CM3403-29ST/SO) or 4.63 (CM3403-46ST/SO) reference to determine the state of the output. Ordering Information PART NUMBERING INFORMATION Standard Finish Lead-free Finish Pins Threshold Voltage Package Ordering Part Number1 Part Marking Ordering Part Number1 Part Marking 3 2.93V SOT23-3 CM3403-29ST 172Y CM3403-29SO 172R 3 4.63V SOT23-3 CM3403-46ST 174Y CM3403-46SO 174R Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. © 2004 California Micro Devices Corp. All rights reserved. 2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 10/29/04 CM3403 Specifications ABSOLUTE MAXIMUM RATINGS PARAMETER RATING UNITS [GND - 0.5] to +6.5 [GND - 0.5] to [VCC + 0.5] V V Storage Temperature Range -40 to +150 °C Operating Temperature Range Ambient -40 to +125 °C Pin Voltages VCC RESET STANDARD OPERATING CONDITIONS PARAMETER VALUE UNITS VCC 0 to 6.0 V Ambient Operating Temperature Range 0 to +70 °C ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL VTH ICC TDELAY tPHL RPULLDOWN RPULLUP PARAMETER Sense Threshold Supply Current CONDITIONS MIN TYP MAX UNITS CM3403-29, TA=25°C 2.89 2.93 2.96 V CM3403-29 2.85 2.93 3.00 V CM3403-46, TA=25°C 4.56 4.63 4.7 V CM3403-46 4.5 4.63 4.75 V 40 80 µA 460 mS No load, VCC=5V Reset Release Delay 140 Propagation Delay when asserting RESET VCC < (VTH - 50mV) 0.2 5 µS RESET Pull-Down Resistance VCC > 1.5V 0.5 3 kΩ RESET Pull-Up Resistance VCC > VTH and t > TDELAY 0.5 3 kΩ Note 1: Electrical Operating Characteristics are specified over the Standard Operating Conditions unless specified otherwise. © 2004 California Micro Devices Corp. All rights reserved. 10/29/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 3 CM3403 Performance Information CM3403 Typical Characteristics (nominal conditions unless specified otherwise) Reset Response with Overdrive Ground Current vs. Voltage 50 GROUND CURRENT [uA] Transient Duration [us] 4 3 2 1 40 30 20 10 0 0 0 50 100 150 Reset Threshold Overdrive [mV] 0 200 1 3 4 5 SUPPLY VOLTAGE [V] Below Trigger RESET* Pull-down Above Trigger RESET* Pull-up 0.6 PULL UP RESISTANCE [kΩ] 1000 PULL DOWN RESISTANCE [kΩ ] 2 100 10 1 0.5 0.4 0.3 0.2 0.1 0.0 0 0 1 2 SUPPLY VOLTAGE [V] 2 3 3 4 5 6 SUPPLY VOLTAGE [V] © 2004 California Micro Devices Corp. All rights reserved. 4 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 10/29/04 CM3403 Performance Information (cont’d) CM3403 Typical Thermal Characteristics (nominal conditions unless specified otherwise) RESET Propagation Delay vs. Temperature RESET Release Delay vs. Temperature TDELAY - Reset Release Delay [ms] tPHL - Reset Propogation Delay [ns] 220 215 210 205 200 195 190 185 180 25 50 75 100 Temperature [oC] 550 500 450 400 350 300 25 125 50 75 100 125 o Temperature [ C] Ground Current vs. Temperature Threshold variation vs. Temperature 20 35 15 Reset Threshold Change [mV] 40 30 IGND [uA] 600 25 20 15 10 5 0 10 5 0 -5 -10 -15 -20 25 50 75 100 Temperature [ oC] 125 25 50 75 100 Temperature [oC] 125 © 2004 California Micro Devices Corp. All rights reserved. 10/29/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 5 CM3403 Mechanical Details SOT23-3 Mechanical Specifications Dimensions for CM3403 devices packaged in 3-lead SOT23 packages are presented below. Mechanical Package Diagrams For complete information on the SOT23-3 package, see the California Micro Devices SOT23 Package Information document. TOP VIEW b 3 E1 E PACKAGE DIMENSIONS Package SOT23-3 JEDEC No. TO-236 (Var. AB) Pins/Leads 3 Dimensions Millimeters 1 Inches Max Min Max A 0.89 1.12 0.0350 0.0441 A1 0.01 0.10 0.0004 0.0039 b 0.30 0.50 0.0118 0.0197 c 0.08 0.20 0.0031 0.0079 D 2.80 3.04 0.1102 0.1197 E 2.10 2.64 0.0827 0.1039 E1 1.20 1.40 0.0472 0.0551 e 0.95 BSC 0.0374 BSC e1 1.90 BSC 0.0748 BSC L1 # per tape and reel 0.40 0.60 0.54 REF e1 e Min L 2 0.0157 SIDE VIEW D A1 A END VIEW c 0.0236 0.0213 REF L1 L 3000 pieces Controlling dimension: millimeters Package Dimensions for SOT23-3. © 2004 California Micro Devices Corp. All rights reserved. 6 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 10/29/04