LX6433CSE

LX6433 TM ® Precision Voltage Monitor P RODUCTION D ATA S HE ET KEY FEATURES Precise Threshold Detection 1.105V ±0.02V 3V to 6.0V Operating Range Active Low RESET, Sink Current > 1mA RESET Pulse Duration Controlled, typical 100mS Quiescent Current < 40μA Wide Temperature: 0-85°C No External Components Required SOT-23, 5-Pin Package, RoHS Compliant (Pb-Free) Similar Devices: FM803, NCP803 and LM3724 APPLICATIONS/BENEFITS Portable Microprocessor Core Voltage Supply Monitor Supply Monitoring: 1.2V, 2.5V, 3.3V, 5V or any other level. DESCRIPTION The LX6433 is a precise voltage monitor programmed to signal a low supply line condition. VMON is connected to the “monitored” supply line, when VMON drops below the threshold of 1.085V, RESET line goes low. When power is restored and VMON moves above the threshold voltage, RESET remains low for an additional 100ms to ensure system reset is fully applied. Digital filtering inside the LX6433 ignores temporary dips in the VMON line lasting for less than 10µS to avoid false triggering. The monitor operates over a supply range (VIN) of 3V to 6V. The RESET line is capable of sinking an output load current of 1mA. This line is protected from short circuit to VIN or Ground without damage. Tight threshold detection allows for a 1.085V to 1.125V window over temperature. System efficiency is maintained with ultra low IQ of 20µA. The 5 pin SOT-23 package provides a small form factor similar to industry standard device types in this category. This package is RoHS compliant allowing Pb free PCB assembly. W WW . Microsemi . C OM IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT 1.2V Supply Microprocessor / ASIC LX6433CSE 3.3 to 5V VIN VMON RESET R Pull-up (Optional) VCC Reset Ground GND Figure 1 – LX6433 Typical Application Circuit LX6433 LX6433 TA(°C) 0 to 85 PACKAGE ORDER INFORMATION Plastic SOT-23 Supply Fault Detection SE 5-PIN (Pb Free) Voltage (VIN) Threshold Voltage RoHS Compliant / Pb-free Device Marking 3 to 6V 1.105V +/-1.8% LX6433CSE 2975 Page 1 Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX6433CSE-TR) Copyright © 2003 Rev. 1.1, 2009-02-11 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 LX6433 TM ® Precision Voltage Monitor P RODUCTION D ATA S HE ET ABSOLUTE MAXIMUM RATINGS Input Voltage (IN) ............................................................................................-0.3V to 7.0V Monitor (VMON) .............................................................................................-0.3V to 7.0V RESET to GND ....................................................................................-0.3V to (VIN + 0.3V) Operating Temperature Range.....................................................................-40°C to +125°C Storage Temperature Range, TA .................................................................... -65°C to 150°C Maximum Junction Temperature..................................................................................150°C RoHS / Pb-free Peak Package Solder Reflow Temperature (40 seconds maximum exposure) .................................................................... 260°C (+0,-5) Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. PACKAGE PIN OUT W WW . Microsemi . C OM GND N.C. RESET 1 2 5 VIN 3 4 VMON SE PACKAGE (Top View) RoHS / Pb-free 100% Matte Tin Pin Finish THERMAL DATA SE Plastic SOT-23 5-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 300°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. FUNCTIONAL PIN DESCRIPTION NAME VIN VMON GND RESET DESCRIPTION Supply voltage, Operational From 3.0V to 6.0V. Monitored input of 1.2V supply. Circuit ground. Output pin, low level indicates fault mode. ELECTRICAL CHARACTERISTICS Specifications apply over the ambient temperature of: 0oC < T < 85°C for VIN = 5V (except where otherwise noted). Typical values are at TA=25°C. Parameter Operating Range Reset High Reset Low RESET Pulse Duration Quiescent Current (Ground Pin) VMON Transient Filter Symbol VINOP VMONTH+ VMONTHRESET PW IQ VMON TRANSIENT Test Conditions Functional operation (correct logic state for RESET) VMON rising, RESET = high (after timeout cycle is completed) VMON falling, RESET = low Time RESET remains low after VMON rises above the threshold RESET Open RESET unchanged for VMON drop below VMONTHRESET activated for momentary dip in VMON below VMONTHISINK = 10mA, VIN = 5V ± 10% ISINK = 20mA, VIN = 5V ±10% TA 0°C to 70°C VMON > 1.2V, VRESET = 5V Time from VMON falling below threshold to RESET going low, VMON overdrive of 50mV. Min 3.0 1.085 Typ Max 6.0 Units V V 1.125 50 100 150 40 10 5 .05 .05 .02 0.4 0.4 1 11 V mS µA µS µS V V µA µS E ELECTRICALS VMON TRIGGER PW RESET VOUT LOW RESET VOUT LOW RESET Leakage RESET DELAY after Trigger VOL VOL ILKG TDELAY Copyright © 2003 Rev. 1.1, 2009-02-11 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX6433 TM ® Precision Voltage Monitor P RODUCTION D ATA S HE ET SIMPLIFIED BLOCK DIAGRAM VMON VIN W WW . Microsemi . C OM CLOCK 1.6MHz REF Pulse Qualifier + Divide by 24 RESET Output OUTPUT RESET SET Clock Negative Edge Detector Divide by 217 GND Figure 2 – Simplified Block Diagram 5V 1V 0V 1.5V “THRESHOLD” 1.0V 0.5V 0.0V 5V 3V 100ms (typ.) 100ms (typ.) VIN ** *** VMON 100ms (typ.) RESET 0V T0 T1 T2 T3 T4 T5 T6 T7 T8 *** T9 T10 T11 T12 T13 T15 T14 T16 T0: RESET invalid logic state for VIN < 2V T1- T1 Vmonitor exceeds Threshold, at T1, RESET pulse remains low for 100ms until T2. T3 - T4: Transient on VIN is ignored, less than 10usec duration for Vmonitor < THRESHOLD. (Same applies for *) T5: Vmonitor drops below Threshold, remains low for > 10usec which activates RESET Low. T6: Vmonitor rises above Threshold but previous fault at T5 has not cycled through full timeout (T 6-T7 < 50mS), RESET remains low. T7: Vmonitor fals below Threshold, RESET remains low. T7-T8 duration > 10uS, RESET timer restarted for 100mS timeout T8-T9: Duration exceeds 150ms, RESET timer cycle completed, output rises T10-T11: Vmonitor falls below Threshold for > 10uS, RESET signal goes low. T13-T14, T15-T16 :Vmonitor is above Threshold, no limits apply for peak voltage or duration. B D BLOCK DIAGRAM Figure 3 – Timing Diagram Copyright © 2003 Rev. 1.1, 2009-02-11 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX6433 TM ® Precision Voltage Monitor P RODUCTION D ATA S HE ET FUNCTIONAL DESCRIPTION The LX6433 operates as a power supply monitor with a threshold window of 1.085V to 1.125V (±1.8%) that can be programmable using external resistors. The VMON pin is the input to the internal comparator and VIN is the power source for the IC. The RESET pin is an open drain, with active low logic. An external pullup resistor can be used if the device (ASIC) driven does not provide this feature. As VMON ramps upwards from zero, RESET is held low until VMON exceeds the threshold, this starts an internal 100ms timer which continues to hold RESET low for that interval. As long as VMON remains above the threshold level and the 100ms timer has completed the cycle, RESET remains high (high impedance state). If a transient of less than 10uS interrupts VMON causing a drop below the threshold the LX6433 will ignore the event. If VMON does drop below the threshold for greater than 12µS the RESET will remain low until VMON recovers above the threshold and the RESET time pulse has been timed out (100ms). W WW . Microsemi . C OM PACKAGE DIMENSIONS SE 5 Pin Plastic SOT-23 MILLIMETERS MIN MAX 0.90 1.30 0.90 1.45 0.25 0.50 0.09 0.20 2.80 3.10 1.50 1.75 0.95 BSC 1.90 BSC 2.60 3.00 0.35 0.55 0.00 0.15 10° MAX INCHES MIN MAX 0.035 0.051 0.035 0.057 0.010 0.020 0.004 0.008 0.110 0.122 0.059 0.069 0.038 BSC 0.075 BSC 0.102 0.118 0.014 0.022 0.000 0.006 10° MAX D G H E A1 A C Dim A A1 B C D E F G H I J K Note: B F J I K 1. Controlled dimensions are in mm, inches are for reference only. 2. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm (.006”) on any side. Lead dimension shall not include solder coverage MECHANICALS MECHANICALS Copyright © 2003 Rev. 1.1, 2009-02-11 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX6433 TM ® Precision Voltage Monitor P RODUCTION D ATA S HE ET CHARACTERISTIC CURVES W WW . Microsemi . C OM VIN VIN MONITOR /RESET MONITOR /RESET Figure 4 Reset Pulse Width after VMONITOR “GOOD” Figure 5 Reset Delay after VMONITOR Falls VMONITOR Droop Pulse Width: 5uS 5uS 10uS 10us VIN /RESET (VMONITOR = 0V) Figure 6 VMONITOR Digital Filter, Reset Logic Ignores Pulse Widths of < 5μS Figure 7 Start-up for VIN CHARTS CHARTS Copyright © 2003 Rev. 1.1, 2009-02-11 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX6433 TM ® Precision Voltage Monitor P RODUCTION D ATA S HE ET NOTES W WW . Microsemi . C OM N NOTES PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2003 Rev. 1.1, 2009-02-11 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6