LTC1536 Precision Triple Supply Monitor for PCI Applications FEATURES DESCRIPTIO Simultaneously Monitors 5V, 3.3V and The LTC 1536 is designed for PCI local bus applications Adjustable Inputs with multiple supply voltages that require low power, Guaranteed Threshold Accuracy: 0.75% small size, high speed and high accuracy supply Low Supply Current: 100A monitoring. Internal Reset Time Delay: 200ms For 3.3V and 5V supplies that are > 500mV below spec or Manual Pushbutton Reset Input for the condition when the 5V supply falls below the 3.3V Active Low and Active High Reset Outputs supply, the LTC1536 has a very fast response time capable Active Low Soft Reset Output of meeting the PCI t timing specification. Tight 0.75% FAIL Power Supply Glitch Immunity threshold accuracy and glitch immunity ensure reliable Guaranteed Reset for Either V 1V or V 1V CC3 CC5 reset operation without false triggering. Meets PCI t Timing Specifications Rev 2.1 FAIL The RST output is guaranteed to be in the correct state for 8-Pin SO and MSOP Packages V or V down to 1V. The 100A typical supply current CC5 CC3 U makes the LTC1536 ideal for power-conscious systems. APPLICATIO S A manual pushbutton reset input provides the ability to PCI-Based Systems generate a very narrow soft reset pulse (100s typ) or a Desktop Computers 200ms reset pulse equivalent to a power-on reset. Both Notebook Computers SRST and RST outputs are open-drain and can be OR-tied Intelligent Instruments with other reset sources. Portable Battery-Powered Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Network Servers TYPICAL APPLICATIO Power Fail Waveform Motherboard PCI RST Generation 5V Dropping Below 3.3V by 300mV V = 5V TO 3V STEP CC5 3.3V 0.3V V = V = 3.3V CC3 CCA PUSHBUTTON 0.1F 4.7k PULL-UP FROM R PU RESET LTC1536 5 RST TO V CC3 1 8 V PBR CC3 4 V CC5 2 7 5V 5% PCI V SRST CC5 3 3 LOCAL 6 RST 0.1F V RST CCA BUS 4 5 2 GND RST RST PWR GOOD 1 R SELECTED TO MEET RISE TIME PU 1536 TA01 SLEW RATE REQUIREMENTS (1k MIN) 0 TIME (20ns/DIV) 1536 TA02 1536fa 1 VOLTAGE (1V/DIV) U ULTC1536 (Notes 1, 2) ABSOLUTEXAI U RATI GS Operating Temperature Range Terminal Voltage LTC1536C .............................................. 0C to 70C V , V , V .................................... 0.3V to 7V CC3 CC5 CCA LTC1536I............................................ 40C to 85C RST, SRST ............................................ 0.3V to 7V Storage Temperature Range ................ 65C to 150C RST ......................................... 0.3V to V + 0.3V CC3 Lead Temperature (Soldering, 10 sec)................. 300C PBR .......................................................... 7V to 7V /O PACKAGE RDER I FOR ATIO TOP VIEW TOP VIEW V 1 8 PBR CC3 V 1 8 PBR CC3 V 2 7 SRST V 2 7 SRST CC5 CC5 V 3 6 RST CCA V 3 6 RST CCA GND 4 5 RST GND 4 5 RST MS8 PACKAGE 8-LEAD PLASTIC MSOP S8 PACKAGE T = 125C, = 160C/ W JMAX JA 8-LEAD PLASTIC SO T = 125C, = 150C/ W JMAX JA ORDER PART NUMBER MS8 PART MARKING ORDER PART NUMBER S8 PART MARKING LTC1536CMS8 LTC1536CS8 1536 LTBV LTC1536IS8 1536I Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: