LTC2904/LTC2905 Precision Dual Supply Monitors with Pin-Selectable Thresholds FEATURES DESCRIPTION n Monitors Two Inputs Simultaneously The LTC 2904/LTC2905 are dual supply monitors in- n Nine Threshold Combinations tended for systems with two supply voltages. The dual n Three Supply Tolerances (5%, 7.5%, 10%) supply monitors have a common reset output with delay n Guaranteed Threshold Accuracy: 1.5% of (200ms for the LTC2904 and adjustable using an exter- Monitored Voltage Over Temperature nal capacitor for the LTC2905). This product provides a n Internal V Auto Select precise, space-conscious and micropower solution for CC n Power Supply Glitch Immunity supply monitoring. n 200ms Reset Time Delay (LTC2904 Only) The LTC2904/LTC2905 feature a tight 1.5% threshold n Adjustable Reset Time Delay (LTC2905 Only) accuracy over the whole operating temperature range, and n Open Drain RST Output glitch immunity to ensure reliable reset operation without n Guaranteed RST for V1 1V or V2 1V false triggering. The open drain RST output is guaranteed n Low Pro le (1mm) SOT-23 (ThinSOT) and to be in the correct state for inputs down to 1V. Plastic (3mm 2mm) DFN Packages The LTC2904/LTC2905 also feature three programming input pins, which program the threshold and tolerance level APPLICATIONS without requiring any external components. These three n Desktop and Notebook Computers programming pins provide a total of 27 different voltage n Handheld Devices level and tolerance combinations, eliminating the need to n Network Servers have different parts for development and implementation n Core, I/O Monitor of different systems with different voltage levels requiring monitoring function. 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 trademarks are the property of their respective owners. TYPICAL APPLICATION 5V, 3.3V Dual Supply Monitor with 5% Tolerance Table 1. Voltage Threshold Programming V1 V2 S1 S2 5V DC/DC SYSTEM 3.3V CONVERTER 5.0 3.3 V1 V1 LOGIC 3.3 2.5 Open GND V1 V2 3.3 1.8 V1 Open LTC2905 0.1F 0.1F 3.3 1.5 Open V1 S1 TMR 3.3 1.2 Open Open 22nF S2 GND 2.5 1.8 GND GND 2.5 1.5 GND Open TOL RST 29045 TA01 2.5 1.2 GND V1 2.5 1.0 V1 GND 29045fd 1LTC2904/LTC2905 ABSOLUTE MAXIMUM RATINGS (Note 1, 2) Terminal Voltages Operating Temperature Range V1, V2 ...................................................... 0.3V to 7V LTC2904C/LTC2905C .............................. 0C to 70C S1, S2, TOL ................................0.3V to (V +0.3V) LTC2904I/LTC2905I .............................40C to 85C CC RST .......................................................... 0.3V to 7V LTC2905H .......................................... 40C to 125C RST (LTC2904) ........................................ 0.3V to 7V Storage Temperature Range .................. 65C to 150C TMR (LTC2905) ....................................... 0.3V to 7V TSOT Lead Temperature (Soldering, 10 sec) .........300C PIN CONFIGURATION TOP VIEW TOP VIEW GND 1 8 TOL V2 1 8 V1 RST 2 7 S1 9 RST/TMR* 2 7 S2 RST/TMR* S2 3 6 RST 3 6 S1 V2 4 5 V1 GND 4 5 TOL TS8 PACKAGE DDB8 PACKAGE 8-LEAD PLASTIC TSOT-23 8-LEAD (3mm s 2mm) PLASTIC DFN * RST FOR LTC2904 EXPOSED PAD IS GND (PIN 9), TMR FOR LTC2905 MUST BE SOLDERED TO PCB T = 150C, = 195C/W JMAX JA * RST FOR LTC2904 TMR FOR LTC2905 = 150C, = 76C/W T JMAX JA ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2904CDDB TRMPBF LTC2904CDDB TRPBF LBCZ 8-Lead (3mm 2mm) Plastic DFN 0C to 70C LTC2904IDDB TRMPBF LTC2904IDDB TRPBF LBDB 8-Lead (3mm 2mm) Plastic DFN 40C to 85C LTC2905CDDB TRMPBF LTC2905CDDB TRPBF LAJF 8-Lead (3mm 2mm) Plastic DFN 0C to 70C LTC2905HDDB TRMPBF LTC2905HDDB TRPBF LBCY 40C to 125C 8-Lead (3mm 2mm) Plastic DFN LTC2905IDDB TRMPBF LTC2905IDDB TRPBF LBCY 8-Lead (3mm 2mm) Plastic DFN 40C to 85C LTC2904CTS8 TRMPBF LTC2904CTS8 TRPBF LTBCJ 8-Lead Plastic TSOT-23 0C to 70C LTC2904ITS8 TRMPBF LTC2904ITS8 TRPBF LTBCK 8-Lead Plastic TSOT-23 40C to 85C LTC2905CTS8 TRMPBF LTC2905CTS8 TRPBF LTAJD 8-Lead Plastic TSOT-23 0C to 70C LTC2905HTS8 TRMPBF LTC2905HTS8 TRPBF LTAJE 8-Lead Plastic TSOT-23 40C to 125C LTC2905ITS8 TRMPBF LTC2905ITS8 TRPBF LTAJE 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: