CAT885 Five-Channel Power Supply Supervisors FEATURES DESCRIPTION Five-channel supply voltage detection 2 VDD inputs allow monitoring of +5.0V, +3.3V, +3.0V, +2.5V or +1.8V supplies 3 adjustable voltage inputs allow monitoring supplies > 0.6V 70ms minimum reset delay Manual reset capability Reset signals valid down to VDD = 1V Accurate ± < 2% voltage threshold Power-supply transients suppressed Low 2µA maximum supply current at 5V RoHS-compliant MSOP package The CAT885 is a five-channel power supply supervisory circuit with high reset thereshold accuracy and very low power consumption. The device features an open-drain output, active-low function with manual reset to perform basic system reset and monitoring functions for a wide range of electronic products. The CAT885 monitors five system voltages by maintaining a reset output active until all the power supply voltages exceed the specified trip values. The device then maintains the reset output in an active condition until the internal timer times out, which allows the system power supplies to stabilize. Two of the five voltage detectors are factory set for standard supplies, while the threshold voltages of the third, fourth, and fifth voltage monitors can be adjusted for specific system design requirements using external resistors. APPLICATIONS Telecom & datacom systems Routers & servers Data storage equipment Set-top boxes Multi-voltage systems The CAT885 lowers system costs and saves board space by integrating five channels into a single, small MSOP 8-lead package. For Ordering Information details see page 7. PIN CONFIGURATION TYPICAL APPLICATION MSOP 8-Lead (Z) VDD VDD2 V3MON (top view) ¯¯¯ MR 1 VDD 2 VDD2 3 VSS 4 8 ¯¯¯¯ RST CAT885 RST 7 V5MON CAT885 6 V4MON V4MON 5 V3MON MR See page 2 for pin functions V5MON © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice Reset Signal 1 PB VSS Doc. No. MD-3028 Rev. C CAT885 FUNCTIONAL BLOCK DIAGRAM VDD VDD MR POR PB VREF VDD2 VDD RST VREF 120 ms TIME-OUT V3MON Reset Signal V4MON VREF VREF V5MON VSS VREF PIN FUNCTIONS Pin # 1 2 3 4 5 6 7 8 Pin ¯¯¯ MR VDD VDD2 VSS V3MON V4MON V5MON ¯¯¯¯ RST Doc. No. MD-3028 Rev. C Function Active-low manual reset Input with internal pull-up resistor Chip supply, first preset under-voltage detector input Second preset under-voltage detector input Ground Adjustable third under-voltage detector input Adjustable fourth under-voltage detector input Adjustable fifth under-voltage detector input Active-low open drain reset output, use external resistor 2 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT885 ABSOLUTE MAXIMUM RATINGS (1) Parameters Ratings Units Temperature under Bias -40 to +125 ºC Voltage on any Pin with Respect to VSS -1.0 to +7.0 V 5 mA 145 °C/W Ratings Units Operating Temperature Range (Industrial) -40 to +85 ºC Storage Temperature -65 to +150 ºC +300 ºC DC Output Current Thermal Resistance ӨJA for MSOP Package (2) RECOMMENDED OPERATING CONDITIONS Parameters Lead Soldering Temperature (10 seconds) ELECTRICAL CHARACTERISTICS Over the recommended operating conditions unless otherwise specified. Symbol VDD IDD1 IDD2 IDDX Parameter Supply Voltage Range VDD Supply Current VDD2 Input Current V3, V4, V5MON Input Current Conditions Min 1.5 VDD = 5.0V VDD2 = 3.3V V3, V4, V5MON = 1.0V Typ. 2 0.5 15 Max 5.5 9 3 50 Units V µA µA nA 4.72 2.92 Voltage Thresholds VTH1 VTH1HYST VTH2 VTH2HYST VREF VREFHYST Fixed Voltage Trip Point for VDD Hysteresis of VTH1 Fixed Voltage Trip Point for VDD2 Hysteresis of VTH2 V3MON, V4MON, V5MON Adj. Reset Threshold Voltage CAT885Lx CAT885Sx VTH1 = 4.63V VTH1 = 2.87V CAT885xT CAT885xS CAT885xZ CAT885xA VTH2 = 3.08V VTH2 = 2.95V VTH2 = 2.33V VTH2 = 1.68V 4.55 2.81 3.02 2.90 2.29 1.65 4.63 2.87 50 30 3.08 2.95 2.33 1.68 40 30 25 20 3.13 3.01 2.37 1.71 V V mV mV V V V V mV mV mV mV VTH for V3, V4, V5MON 0.585 0.598 0.611 V Hysteresis Voltage 3 mV Notes: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the devices at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. (2) θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 3 Doc. No. MD-3028 Rev. C CAT885 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Conditions Min Reset Output Voltage Low VDD ≥ 3.3V, Sinking 2.5mA VDD < 3.3V, Sinking 1.5mA Typ. Max Units 0.05 0.05 6 120 5 0.40 0.40 V V µs ms pF Reset VOL tRPD tPD CLOAD VTH to Reset Asserted Delay POR Timeout Delay Load Capacitance on Reset Pin 1 70 Manual Reset ¯¯¯ VTHL MR Input Voltage Low ¯¯¯ VTHH MR Input Voltage High ¯¯¯ TPW MR Minimum Pulse Width RIN Internal Pull-Up Resistor 240 0.8 VDD - 0.6 1 8 16 V V µs kΩ OPERATION CAT885 allows users to adjust the minimum voltage sense level for three of the five monitored voltages. For example, the user can adjust the voltage input trip point for V3MON, V4MON and V5MON inputs. This is done by connecting an external resistor divider network to the VxMON pin in order to set the trip point to a voltage above 600mV. Resistors R1 and R2 in Figure 1 are selected by the formula: VTRIP = 0.6V x (R1 + R2) / R2. The CAT885 is designed to monitor critical supply voltages in line driven and battery powered microprocessor systems, providing Supply Voltage Supervision, Power On Reset control and Manual Reset Assertion. These features along with excellent threshold accuracy and low power consumption make the CAT885 device suitable for a wide variety of applications needing multi-voltage monitoring. During normal operation, the CAT885 monitors the voltage levels of VDD, V2MON, V3MON, V4MON, and V5MON. If the voltage on any of these five inputs falls below their respective voltage trip points, a reset is ¯¯¯¯ = low) to prevent the microprocessor asserted (RST from operating during a power failure or brownout condition. This reset signal remains low until the voltages exceeds the voltage threshold settings for the reset time delay period tPD. VDD V2MON CAT885 R1 VxMON R2 GND Figure 1. CAT885 Programming Trip Voltage Doc. No. MD-3028 Rev. C 4 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT885 POWER ON RESET (POR) MANUAL RESET Applying power to the CAT885 activates a POR circuit which activates the reset output (active LOW). At power-up POR prevents the system microprocessor from starting to operate with insufficient voltage and prior to stabilization of the clock oscillator. It ensures that operation is precluded until internal registers are properly loaded, FPGA’s have downloaded their configuration data prior and all system power supplies are above minimum operating levels and stable. The reset signal remains active until VDD rises above the minimum preset voltage level for time period tPD. ¯¯¯) allows the user to trigger The manual-reset input (MR a reset by using a push-button switch or by electronically driving the input low. The ¯¯¯ MR input is an active LOW debounced input. Reset is asserted anytime the ¯¯¯ MR pin is pulled low to less than 100mV for the minimum ¯¯¯ MR pulse width or longer. The reset output remains asserted low for tPD , typically 120ms and then is released. Figures 2 and 3 illustrate the CAT885’s operation and ¯¯¯¯ RST output response times. VDD/ VDD2 VTH1/2 1V 0 >TPW MR 0 tPD tRPD tPD tPD RST 0 tRPD Figure 2. Power Supply Monitoring Diagram VMON VTH 0 tRPD tPD RST 0 Figure 3. Auxillary Voltage Monitoring Diagram © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 5 Doc. No. MD-3028 Rev. C CAT885 PACKAGE OUTLINE DRAWING MSOP 8-Lead 3 x 3mm (Z) (1)(2) SYMBOL MIN NOM MAX A E E1 1.10 A1 0.05 0.10 0.15 A2 0.75 0.85 0.95 b 0.22 c 0.13 D 2.90 0.38 0.23 3.00 3.10 E 4.80 4.90 5.00 E1 2.90 3.00 3.10 e L 0.65 BSC 0.40 0.60 L1 L2 θ 0.80 0.95 REF 0.25 BSC 0º 6º TOP VIEW D A A2 A1 DETAIL A e b c SIDE VIEW END VIEW θ L2 L L1 DETAIL A Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-187. Doc. No. MD-3028 Rev. C 6 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT885 EXAMPLE OF ORDERING INFORMATION (1) Prefix CAT Device # Suffix 885 Z I Package Z: MSOP Voltage Detection VDD Level S = 2.87V L = 4.63V Company ID Product Number 885 -L Temperature Range I = Industrial (-40ºC to 85ºC) S Voltage Detection VDD2 Level T = 3.08V S = 2.95V Z = 2.33V A = 1.68V -G T3 Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish G:NiPdAu ORDERING INFORMATION Part Number VDD VDD2 Package CAT885ZI-ST-GT3 2.87V 3.08V MSOP CAT885ZI-SS-GT3 2.87V 2.95V MSOP CAT885ZI-SZ-GT3 2.87V 2.33V MSOP CAT885ZI-SA-GT3 2.87V 1.68V MSOP CAT885ZI-LT-GT3 4.63V 3.08V MSOP CAT885ZI-LS-GT3 4.63V 2.95V MSOP CAT885ZI-LZ-GT3 4.63V 2.33V MSOP CAT885ZI-LA-GT3 4.63V 1.68V MSOP Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard finish is NiPdAu. (3) The device used in the above example is a CAT885ZI-LS-GT3 (MSOP, Industrial Temperature, 4.63V (VDD) and 2.95V (VDD2) Detection Levels, NiPdAu, Tape & Reel, 3,000/Reel). (4) For additional detection voltage, package and temperature options, please contact your nearest ON Semiconductor Sales office. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-3028 Rev. C CAT885 REVISION HISTORY Date Rev. Description 05-May-08 A Initial Release 06-Nov-08 B Change logo and fine print to ON Semiconductor 03-Aug-09 C Update Functional Block Diagram ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: [email protected] Doc. No. MD-3028 Rev. C N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 8 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice