CM3400

CM3400 CALMIRCO | Alldatasheet

Document overview

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Technical content

Features

• Temperature stable 1.0V trigger reference  User adjustable reset threshold  User adjustable reset delay time > 25msec  Complimentary outputs (RESET, RESET )  Integrated pull-up/down resistors  Manual reset (MR ) control input  Low operating current (40 µA typ.)  8-lead MSOP and SOIC package

Applications

 Critical power monitoring  Power-up sequencing  Memory integrity during "brownouts" Product Description The CM3400 is a universal supply voltage supervisory (SVS) controller for critical power monitoring and power sequencing applications. During an initial power-up, both complimentary outputs (RESET, RESET ) remain active. Once the supply voltage being monitored exceeds the user programmed reset threshold, the out- puts will remain active for an additional timeout interval which is also user controlled. Both outputs become inactive once the delay interval has expired. The user controlled reset threshold is determined by two external resistors as follows: Reset Threshold [V] = (R 1 + R2) / R2 The delay time is set by an external capacitor C T, as follows (where CT is in [nF]): Reset Delay [ms] = (375 x C T[nF]) + 25 [ms] During a brown-out condition, both outputs will immedi- ately become active and remain active until the supply being monitored has been restored for a period exceeding the delay pulse. During a complete power- down situation, both outputs will continually "hug" their respective rails. This is achieved by the use of inte- grated pull-up/down resistors. The CM3400 is available in a low profile MSOP-8 and a SOIC-8 package. Simplified Electrical SchematicTypical Application Circuit SENSE MR RESET GND CT CT GND CM3400 RESET VDD uP or Memory Control R

2 SENSE

1µA

© 2003 California Micro Devices Corp. All rights reserved. CM3400 PIN DESCRIPTIONS PIN(S) NAME DESCRIPTION 1 N.C. No connect. 2M R Active-Low manual reset control input. Whenever this input is taken logic low (grounded), the device will immediately force a reset condition. Upon releasing from ground the reset will remain active for the duration of the reset delay timing T DELAY interval. This contains an internal pull-up current source and may be left unconnected if not used. 3C T Capacitor timing control input. The timeout delay interval produced by the external timing capacitor is 25ms/nF . A temperature stable internal current source (0.2µA) is used to accurately control the user programmable delay interval. If no external timing capacitor is present, the delay timeout interval is 25ms. 4 GND Negative reference for all voltages. 5 RESET Active-low reset output. Whenever VOUT falls below the Reset threshold, the logic output immediately is driven low (to GND). Upon V OUT rising above the Reset threshold, the logic output remains low (at GND) for an additional delay time duration T d, after which it is driven to a logic high level (set by VOUT). The power-on reset circuitry remains enabled under all conditions and produces a valid output logic, even when V CC is not present. 6 RESET Active-high reset output. Inverse of RESET . 7 SENSE Positive input voltage to the accurate 1.0 volt threshold comparator. Whenever this input is below the trigger threshold (1.0V) both logic outputs are immediately held in their respective Active state. When this input signal rises past the trigger threshold voltage, the delay timer will start and both logic outputs will still remain Active. Once the delay time has been reached both logic outputs will toggle to their respective Inactive state. DD Input power source for the device. The device is designed to operate with supply voltage of 2.5V or greater. Whenever the supply voltage is below 2.5V (i.e during power-up / power-down) an internal undervoltage lockout circuit is activated which prevents any false triggering on the RESET logic outputs. This feature ensures the logic outputs will "hug" their respective rail and produce valid outputs under all supply conditions. (Con- ventional Supervisory circuits can generate undefined output conditions during initial power-up sequences) PACKAGE / PINOUT DIAGRAM Note: This drawing is not to scale. 8-pin MSOP N.C. MR CT GND VDD SENSE RESET RESET Top View 8-pin SOIC N.C. MR CT GND VDD SENSE RESET RESET Top View

© 2003 California Micro Devices Corp. All rights reserved. CM3400

Ordering Information

Note 1: Parts are shipped in T ape & Reel form unless otherwise specified. Specifications PART NUMBERING INFORMATION Pins Package Ordering Part Number2 Part Marking

8 MSOP-8 CM3400-00MS 171CMD

8 SOIC-8 CM3400-00SN CMPWR171SN

ESD Protection (HBM) + 1500 V Pin Voltages VDD, SENSE, MR, CT Inputs RESET, RESET Outputs [GND - 0.5] to +6.5 [GND - 0.5] to [VDD + 0.5] V V Storage T emperature Range -40 to +150 °C Operating Temperature Range Ambient -40 to +125 °C STANDARD OPERATING CONDITIONS PARAMETER VALUE UNITS VDD Supply 2.5 to 5.5 V SENSE Input 0 to 5.5 V CT Timing Capacitor 0 to 3.3 nF Ambient Operating T emperature Range 0 to +70 °C

© 2003 California Micro Devices Corp. All rights reserved. CM3400 Specifications (cont’d) RESET Pin RESET Pin MR Pin Note 1: Electrical Operating Characteristics are specified over the Standard Operating Conditions unless specified otherwise. ELECTRICAL OPERATING CHARACTERISTICS1 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VTH SENSE Threshold Trigger Level 0.95 1.00 1.05 V ISENSE SENSE Input Bias Current 1 µA ICT Timing Current Source 0.10 0.16 0.25 µA TDELAY Timing Capacitor Delay (applies to RESET & RESET outputs) CT not connected (default) 15 25 35 mS CT = 0.1nF 35 55 75 mS CT = 1nF 225 325 425 mS IGND Ground Current No load. 40 70 µA tPHL Propagation Delay When Assert- ing RESET SENSE < (VTH - 50mV) 0.5 5 µS RPULLUP RESET Pull-up Impedance V DD < 1.0V VDD > 2.5V 100 0.5 500 kΩ kΩ RPULLDOWN RESET Pull-down Impedance 0.5 3 k Ω RPULLDOWN RESET Pull-down Impedance V DD < 1.0V VDD > 2.5V 200 0.5 500 kΩ kΩ RPULLUP RESET Pull-up Impedance 0.5 3 k Ω IMR Internal Pull-up Current 0.5 2 5 µA VIH MR High Detect Input Level 1.5 V VIL MR Low Detect Input Level 0.3 V tMR Propagation Delay 2 µS

© 2003 California Micro Devices Corp. All rights reserved. CM3400 Performance Information CM3400 Typical Transient Characteristics (nominal conditions unless specified otherwise) Transient Operation Description (VDD > 2.5V) Actual Transient Operation Threshold Trigger Voltage vs. Supply 500 600 700 800 900 1000 1100 SUPPLY VOLTAGE [V] THRESHOLD [mV] RESET Comparator Response With Overdrive 0 50 100 150 200 OVERDRIVE [mV] RESPONSE [us] Timeout Delay With CT Capacitance 100 1000 0.01 0.10 1.00 CT [nF] TIMEOUT DELAY [ms]

© 2003 California Micro Devices Corp. All rights reserved. CM3400 Performance Information (cont’d) CM3400 Typical DC Characteristics (nominal conditions unless specified otherwise) Sense Input Current vs. Voltage 0.0 0.5 1.0 1.5 2.0 2.5 012345 SE NSE V OLTA GE [V ] SENSE CURRENT [nA ] Ground Current vs. Supply 012345 SU PPL Y VOL TAG E [V] GROUND CURRE NT [uA] RESET Pull-down Drive Resistance 10 0 1000 0123 SUPPLY VOLTA GE [V] PULL DOWN RESISTA NCE [kΩ ] RESET Pull-up Drive Resistance 0.0 0.1 0.2 0.3 0.4 0.5 23456 SUPPLY VOLTAGE [V] PULL UP RESISTA NCE [kΩ ] RESET Pull-down Drive Resistance 100 100 0 0123 SUPPLY VOLTAGE [V] PULL UP RESISTANCE [kΩ] RESET Pull-down Drive Resistance 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 23456 SUPPLY VOLTAGE [V] DRIVE RESISTANCE [kΩ]

© 2003 California Micro Devices Corp. All rights reserved. CM3400 Performance Information (cont’d) CM3400 Typical Thermal Characteristics (nominal conditions unless specified otherwise) RESET Propagation Delay vs. Temperature 18 0 18 5 19 0 19 5 20 0 20 5 21 0 21 5 22 0 25 50 75 1 00 1 25 Tem pe rat ure [oC] tPHL - Reset Propogation Delay [ns] RESET Release Delay (default) vs. Temperature 25 50 75 1 00 1 25 TEMPERA TURE [oC] TIMEOUT DELA Y [ ms ] Ground Current vs. Temperature 25 50 75 1 00 1 25 Te mp er ature [oC] IGND [uA] SENSE Threshold vs. Temperature -10 25 50 75 100 125 Temperature [oC] Reset Threshold Change [mV]

© 2003 California Micro Devices Corp. All rights reserved. CM3400 Mechanical Details The CM3400 is available in an 8-pin SOIC and an 8-pin MSOP package. Dimensions for each of these pack- ages are presented in this section. SOIC-8 Mechanical Specifications Dimensions for CM3400-00SN devices packaged in 8- pin SOIC packages are presented below. For complete information on the SOIC-8 package, see the California Micro Devices SOIC Package Informa- tion document. * This is an approximate number which may vary. Package Dimensions for SOIC-8 PACKAGE DIMENSIONS Package SOIC Pins 8 Dimensions Millimeters Inches Min Max Min Max A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.19 0.150 0.165 e 1.27 BSC 0.050 BSC H 5.80 6.20 0.228 0.244 L 0.40 1.27 0.016 0.050 # per tube 100 pieces* # per tape and reel 2500 pieces Controlling dimension: inches Mechanical Package Diagrams E D H TOP VIEW L END VIEW C eB A A1SEATING PLANE SIDE VIEW 1234 8765 Pin 1 Marking

© 2003 California Micro Devices Corp. All rights reserved. CM3400 Mechanical Details (cont’d) MSOP-8 Mechanical Specifications Dimensions for CM3400-00MS devices packaged in an 8-pin MSOP packages are presented below. For complete information on the MSOP-8 package, see the California Micro Devices MSOP Package Informa- tion document. * This is an approximate amount which may vary. Package Dimensions for MSOP-8 PACKAGE DIMENSIONS Package MSOP Pins 8 Dimensions Millimeters Inches Min Max Min Max A 0.87 1.17 0.034 0.046 A1 0.05 0.25 0.002 0.010 B 0.30 (typ) 0.012 (typ) C 0.18 0.007 D 2.90 3.10 0.114 0.122 E 2.90 3.10 0.114 0.122 e 0.65 BSC 0.025 BSC H 4.78 4.98 0.188 0.196 L 0.52 0.54 0.017 0.025 # per tube 80 pieces* # per tape and reel 4000 pieces Controlling dimension: inches Mechanical Package Diagrams E D H 1234 8765 L END VIEW C eB A A1SEA TING PLANE SIDE VIEW TOP VIEW Pin 1 Marking