LTC2908 Precision Six Input Supply Monitor FEATURES DESCRIPTION n Ultralow Voltage Reset: V = 0.5V Guaranteed* The LTC 2908 is a six input supply monitor for systems CC n Monitors Six Inputs Simultaneously: requiring a precise and compact monitoring solution 5V, 3.3V, 2.5V, 1.8V, ADJ1, ADJ2 (LTC2908-A1) for multiple supply voltages. The inputs can be shorted 3.3V, 2.5V, 1.8V, 1.5V, ADJ1, ADJ2 (LTC2908-B1) together for monitoring systems with fewer than six 2.5V, ADJ1, ADJ2, ADJ3, ADJ4, ADJ5 (LTC2908-C1) supply voltages, and the open drain RST output of two or n Guaranteed Threshold Accuracy: 1.5% of more LTC2908s can be wired-OR together for monitoring Monitored Voltage Overtemperature systems with more than six supply voltages. The common n Internal V Auto Select reset output remains low until all six inputs have been in CC n Power Supply Glitch Immunity compliance for 200ms. n 200ms Reset Time Delay The LTC2908 features a tight 1.5% threshold accuracy over n Active Low Open-Drain RST Output the entire operating temperature range and glitch immunity n Low Pro le (1mm) 8-Lead SOT-23 (ThinSOT) and to ensure reliable reset operation without false triggering. Plastic (3mm 2mm) DFN Packages The open-drain RST output state is guaranteed to be in the correct state as long as V1 and/or V2 is 0.5V or greater. APPLICATIONS The LTC2908 also features adjustable inputs with a nominal n Network Servers threshold level at 0.5V. This product provides a precise, n Wireless Base Stations space-conscious, micropower and general purpose solu- n Optical Networking Systems tion for any kind of system requiring supply monitors. n Multivoltage Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other n Desktop and Notebook Computers trademarks are the property of their respective owners. *Patent pending. TYPICAL APPLICATION Six Supply Monitor with 5% Tolerance RST Output Voltage vs V1 (12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V) with 10k Pull-Up Resistor to V1 12V 0.4 V3 = V4 = V = ADJ1 V = V = ADJ2 ADJ3 3.3V DC/DC V = V = GND ADJ4 ADJ5 0.3 2.5V DC/DC V1 INPUT SYSTEM 1.8V DC/DC 0.2 1.5V V2 = GND DC/DC 0.1 1.2V DC/DC 0.1F 0.1F 2.15M 124k V2 = V1 (A1/B1) 100k 100k 0 0.4 0 0.2 0.6 0.8 V1 (V) V1 V2 V3 V4 V V ADJ1 ADJ2 2908 TA01b LTC2908-B1 RST GND 2908 TA01a 2908fd 1 RST OUTPUT VOLTAGE (V)LTC2908 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Storage Temperature Range Terminal Voltages DFN Package ......................................65C to 125C V1, V2, V3, V4 .........................................0.3V to 7V TSOT-23 Package ...............................65C to 150C V , V , V , ..................0.3V to (V + 0.6V) ADJ1 ADJ2 ADJ3 CC Lead Temperature (Soldering, 10 sec) .................. 300C V , V .............................0.3V to (V + 0.6V) ADJ4 ADJ5 CC RST .......................................................... 0.3V to 7V Operating Temperature Range LTC2908C ................................................ 0C to 70C LTC2908I..............................................40C to 85C PIN CONFIGURATION LTC2908CDDB-A1 LTC2908CDDB-C1 LTC2908CTS8-A1 LTC2908CTS8-C1 LTC2908IDDB-A1 LTC2908IDDB-C1 LTC2908ITS8-A1 LTC2908ITS8-C1 LTC2908CDDB-B1 LTC2908CTS8-B1 LTC2908IDDB-B1 LTC2908ITS8-B1 TOP VIEW TOP VIEW GND 1 8 V GND 1 8 V ADJ2 ADJ4 TOP VIEW TOP VIEW RST 2 7 V3 RST 2 7 V ADJ3 V2 1 8V1 V1 1 8V ADJ1 9 9 V4 3 6 V V 3 6 V 7 V 7 V ADJ1 ADJ5 ADJ2 V4 2 ADJ1 V 2 ADJ2 ADJ5 V2 4 5 V1 V1 4 5 V RST 3 6V3 RST 3 6V ADJ1 ADJ3 GND 4 5 V GND 4 5 V ADJ2 ADJ4 DDB8 PACKAGE DDB8 PACKAGE TS8 PACKAGE TS8 PACKAGE 8-LEAD (3mm 2mm) PLASTIC DFN 8-LEAD (3mm 2mm) PLASTIC DFN 8-LEAD PLASTIC TSOT-23 8-LEAD PLASTIC TSOT-23 T = 125C, = 76C/W T = 125C, = 76C/W T = 125C, = 250C/W T = 125C, = 250C/W JMAX JA JMAX JA JMAX JA JMAX JA EXPOSED PAD (PIN 9) EXPOSED PAD (PIN 9) (PCB CONNECTION OPTIONAL) (PCB CONNECTION OPTIONAL) ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2908CDDB-A1 TRMPBF LTC2908CDDB-A1 TRPBF LBFD 8-LEAD (3mm 2mm) PLASTIC DFN 0C to 70C LTC2908IDDB-A1 TRMPBF LTC2908IDDB-A1 TRPBF LBFF 8-LEAD (3mm 2mm) PLASTIC DFN 40C to 85C LTC2908CDDB-B1 TRMPBF LTC2908CDDB-B1 TRPBF LBFG 8-LEAD (3mm 2mm) PLASTIC DFN 0C to 70C LTC2908IDDB-B1 TRMPBF LTC2908IDDB-B1 TRPBF LBFH 8-LEAD (3mm 2mm) PLASTIC DFN 40C to 85C LTC2908CDDB-C1 TRMPBF LTC2908CDDB-C1 TRPBF LCFV 8-LEAD (3mm 2mm) PLASTIC DFN 0C to 70C LTC2908IDDB-C1 TRMPBF LTC2908IDDB-C1 TRPBF LCFV 40C to 85C 8-LEAD (3mm 2mm) PLASTIC DFN LTC2908CTS8-A1 TRMPBF LTC2908CTS8-A1 TRPBF LTBFJ 8-LEAD PLASTIC TSOT-23 0C to 70C LTC2908ITS8-A1 TRMPBF LTC2908ITS8-A1 TRPBF LTBFK 8-LEAD PLASTIC TSOT-23 40C to 85C LTC2908CTS8-B1 TRMPBF LTC2908CTS8-B1 TRPBF LTBFM 8-LEAD PLASTIC TSOT-23 0C to 70C LTC2908ITS8-B1 TRMPBF LTC2908ITS8-B1 TRPBF LTBFN 8-LEAD PLASTIC TSOT-23 40C to 85C LTC2908CTS8-C1 TRMPBF LTC2908CTS8-C1 TRPBF LTCFT 8-LEAD PLASTIC TSOT-23 0C to 70C LTC2908ITS8-C1 TRMPBF LTC2908ITS8-C1 TRPBF LTCFT 8-LEAD PLASTIC TSOT-23 40C to 85C TRM = 500 pieces. *Temperature grades are identi ed by a label on the shipping container. Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on lead based nish parts. For more information on lead free part marking, go to: