LTC2900 Programmable Quad Supply Monitor with Adjustable Reset Timer FEATURES DESCRIPTIO n Simultaneously Monitors Four Supplies The LTC 2900 is a programmable supply monitor for n 16 User Selectable Combinations of 5V, 3.3V, 3V, systems with up to four supply voltages. One of 16 preset 2.5V, 1.8V, 1.5V and/or Adjustable Voltage or adjustable voltage monitor combinations can be se- Thresholds lected using an external resistor divider connected to the n Guaranteed Threshold Accuracy: 1.5% of program pin. The preset voltage thresholds are accurate Monitored Voltage Over Temperature to 1.5% over temperature. n Low Supply Current: 43m A Typ The reset delay time is adjustable using an external n Adjustable Reset Time capacitor and the manual reset input may be used with a n Small MSOP and 3mm 3mm DFN Packages momentary switch to issue reset pulses with programmed n Manual Reset Pin duration. Tight voltage threshold accuracy and glitch n Open-Drain RST Output (LTC2900-1) immunity ensure reliable reset operation without false n Push-Pull RST Output (LTC2900-2) triggering. The RST output is guaranteed to be in the n Power Supply Glitch Immunity correct state for V down to 1V. The LTC2900-1 features CC n Guaranteed RST for V 1V CC an open-drain RST output, while the LTC2900-2 has a push-pull RST output. U APPLICATIO S The 43m A supply current makes the LTC2900 ideal for n power conscious systems and it may be configured to Desktop and Notebook Computers n monitor less than four inputs. The parts are available in Multivoltage Systems n the 10-lead MSOP and the 10-lead 3mm 3mm DFN Telecom Equipment n packages. Portable Battery-Powered Equipment n , LTC and LT are registered trademarks of Linear Technology Corporation. Network Servers TYPICAL APPLICATIO Quad Supply Monitor (5V, 3.3V, 2.5V, 1.8V) 5V 3.3V DC/DC SYSTEM 2.5V CONVERTER LOGIC 1.8V V3 V4 V1 LTC2900-2 V2 C1 C2 0.1F 0.1F V REF RST R1 59k V PBR PG 1% GND CRT PUSH-BUTTON R2 RESET 40.2k C RT 1% 47nF 2900 TA01 t = 216ms RST 2900f 1 U ULTC2900 (Notes 1, 2, 3) ABSOLUTE AXI U RATI GS V1, V2, V3, V4, V , PBR ............................. 0.3V to 7V V4 Input Current ( ADJ Mode) ............................ 1mA PG RST (LTC2900-1)........................................ 0.3V to 7V Operating Temperature Range RST (LTC2900-2).......................... 0.3V to (V2 + 0.3V) LTC2900-1C/LTC2900-2C ....................... 0 C to 70 C CRT ............................................. 0.3V to (V + 0.3V) LTC2900-1I/LTC2900-2I .................... 40 C to 85 C CC V ............................................. 0.3V to (V + 0.3V) Storage Temperature Range .................. 65 C to 150 C REF CC Reference Load Current (I ) ............................ 1mA Lead Temperature (Soldering, 10 sec)................... 300 C VREF UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART NUMBER NUMBER TOP VIEW LTC2900-1CMS LTC2900-1CDD TOP VIEW V3 1 10 V2 V3 1 10 V2 LTC2900-2CMS LTC2900-2CDD V1 2 9 V4 V1 2 9 V4 LTC2900-1IMS LTC2900-1IDD CRT 3 8 V REF CRT 3 8 V REF RST 4 7 V PG RST 4 7 V LTC2900-2IMS LTC2900-2IDD PG PBR 5 6 GND PBR 5 6 GND MS PACKAGE MS PART MARKING DD PART MARKING 10-LEAD PLASTIC MSOP DD PACKAGE T = 125 C, q = 250 C/W JMAX JA 10-LEAD (3mm 3mm) PLASTIC DFN LTYJ LABU T = 125 C, q = 43 C/W JMAX JA LTYL LABW LTYK LABV LTYM LABX 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 = 25 C. V = 5V, unless otherwise noted. (Note 3) A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V 5V, 5% Reset Threshold V1 Input Threshold l 4.600 4.675 4.750 V RT50 V 3.3V, 5% Reset Threshold V1, V2 Input Threshold l 3.036 3.086 3.135 V RT33 V 3V, 5% Reset Threshold V2 Input Threshold l 2.760 2.805 2.850 V RT30 V 2.5V, 5% Reset Threshold V2, V3 Input Threshold l 2.300 2.338 2.375 V RT25 V 1.8V, 5% Reset Threshold V3, V4 Input Threshold l 1.656 1.683 1.710 V RT18 V 1.5V, 5% Reset Threshold V3, V4 Input Threshold l 1.380 1.403 1.425 V RT15 V ADJ Reset Threshold V3, V4 Input Threshold l 0.492 0.500 0.508 V RTA V ADJ Reset Threshold V4 Input Threshold l 18 0 18 mV RTAN V Minimum Internal Operating Voltage RST in Correct Logic State, l 1V CC V Rising Prior to Program CC V Minimum Required for Programming V Rising l 2.42 V CCMINP CC V Reference Voltage V 2.3V, I = 1mA, C 1000pF l 1.192 1.210 1.228 V REF CC VREF REF V Programming Voltage Range V V l 0V V PG CC CCMINP REF I V Input Current V = V l 20 nA VPG PG PG REF I V1 Input Current V1 = 5V, I = 12m A, (Note 4) l 43 75 m A V1 VREF 2900f 2 U WWW