LTC2906/LTC2907 Precision Dual Supply Monitors with One Pin-Selectable Threshold and One Adjustable Input FEATURES DESCRIPTIO n The LTC 2906/LTC2907 are dual supply monitors in- Monitors Two Inputs Simultaneously n tended for systems with multiple supply voltages. The Three Threshold Selections for 5V, 3.3V or 2.5V dual supply monitors have a common reset output with Supplies n delay (200ms for the LTC2906 and adjustable using an Low Voltage Adjustable Input (0.5V) n external capacitor for the LTC2907). These products pro- Three Supply Tolerances (5%, 7.5%, 10%) n vide a precise, space-conscious and micropower solution Guaranteed Threshold Accuracy: 1.5% of for supply monitoring. Monitored Voltage Over Temperature n Internal V Auto Select CC The LTC2906/LTC2907 feature a tight 1.5% threshold n Power Supply Glitch Immunity accuracy over the whole operating temperature range n 200ms Reset Time Delay (LTC2906 Only) and glitch immunity to ensure reliable reset operation n Adjustable Reset Time Delay (LTC2907 Only) without false triggering. The open drain RST output state n Open Drain RST Output is guaranteed to be in the correct state for V1 and/or V CC n Guaranteed RST for V1 1V or V 1V CC down to 1V. TM n Low Profile (1mm) SOT-23 (ThinSOT ) and The LTC2906/LTC2907 also feature one adjustable input Plastic (3mm 2mm) DFN Packages U with a nominal threshold level at 0.5V, another input with APPLICATIO S three possible input threshold levels, and three supply tolerances for possible margining. These features provide n Desktop and Notebook Computers versatility for any kind of system requiring dual supply n Handheld Devices monitors. Two three-state input pins program the thresh- n Network Servers old and tolerance level without requiring any external n Core, I/O Monitor components. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Dual Supply Monitor with Adjustable Tolerance (2.5V, 0.8V) Supply Selection Programming V1 S1 2.5V 5.0 V1 DC/DC SYSTEM 0.8V CONVERTER LOGIC 3.3 OPEN 49.9k 2.5 GND V1 V ADJ LTC2907 0.1F Tolerance Programming V TMR 0.1F 100k CC 22nF TOLERANCE TOL S1 GND 5% V1 7.5% OPEN TOL RST 29067 TA01 TOLERANCE = 10% 10% GND 29067f 1 U ULTC2906/LTC2907 ABSOLUTE AXI U RATI GS (Notes 1, 2) Terminal Voltages Operating Temperature Range V1, V ........................................................ 0.3V to 7V LTC2906C/LTC2907C .............................. 0C to 70C CC S1, V , TOL ............................ 0.3V to (V + 0.3V) LTC2906I/LTC2907I ............................40C to 85C ADJ MAX RST ............................................................. 0.3V to 7V Storage Temperature Range ..................65C to 150C RST (LTC2906)............................................ 0.3V to 7V Lead Temperature (Soldering, 10 sec).................. 300C TMR (LTC2907) ........................................... 0.3V to 7V UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART TOP VIEW NUMBER NUMBER GND 1 8 TOL TOP VIEW LTC2906CDDB LTC2906CTS8 RST 2 7 S1 V 1 8 V1 LTC2906IDDB CC LTC2906ITS8 9 RST/TMR* 3 6 V ADJ RST/TMR* 2 7 V ADJ LTC2907CDDB LTC2907CTS8 V V1 RST 3 6 S1 4 5 CC LTC2907IDDB LTC2907ITS8 GND 4 5 TOL DDB8 PACKAGEDDB8 PACKAGE TS8 PACKAGE DDB8 PART MARKING TS8 PART MARKING 8-LEAD (3mm 8-LEAD (3mm 2mm) PLASTIC DFN 2mm) PLASTIC DFN 8-LEAD PLASTIC TSOT-23 EXPOSED PAD IS GND (PIN 9), *RST FOR LTC2906 LBDC LTBCM MUST BE SOLDERED TO PCB TMR FOR LTC2907 *RST FOR LTC2906 T = 125C, = 250C/W LBDD JMAX JA LTBCN TMR FOR LTC2907 LBDF LTBCP T = 125C, = 250C/W JMAX JA LBDG LTBCQ Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = V1 = 2.5V, V = 0.55V, S1 = TOL = 0V, unless otherwise noted. A CC ADJ (Notes 2, 3, 4) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V 5V, 5% Reset Threshold V1 Input Threshold l 4.600 4.675 4.750 V RT50 5V, 7.5% Reset Threshold l 4.475 4.550 4.625 V 5V, 10% Reset Threshold l 4.350 4.425 4.500 V V 3.3V, 5% Reset Threshold V1 Input Threshold l 3.036 3.086 3.135 V RT33 3.3V, 7.5% Reset Threshold l 2.954 3.003 3.053 V 3.3V, 10% Reset Threshold l 2.871 2.921 2.970 V V 2.5V, 5% Reset Threshold V1 Input Threshold l 2.300 2.338 2.375 V RT25 2.5V, 7.5% Reset Threshold l 2.238 2.275 2.313 V 2.5V, 10% Reset Threshold l 2.175 2.213 2.250 V V ADJ, 5% Reset Threshold V Input Threshold l 0.492 0.500 0.508 V RTADJ ADJ ADJ, 7.5% Reset Threshold l 0.479 0.487 0.495 V ADJ, 10% Reset Threshold l 0.465 0.473 0.481 V V Minimum V Operating Voltage (Note 2) RST, RST in Correct Logic State l 1V MAX(MIN) MAX I V Input Current V > V1 l 54 100 A VCC CC CC V1 > V l 1 A CC I V1 Input Current V > V1 l 13 A V1 CC V1 > V l 55 100 A CC I V Input Current l 15 nA VADJ ADJ 29067f 2 U WWW