Standard Products UT01VS50L Voltage Supervisor Data Sheet July 28, 2014 www.aeroflex.com/voltsupv FEATURES INTRODUCTION 4.75V to 5.5V Operating voltage range Power supply (VDD) monitor set by the internal voltage reference at 4.65V Precision Input Voltage Monitor using an internal 1.25V voltage reference Watchdog Timer Circuit monitoring activity on WDI input - Nominal timeout 1.6s RESET output responding to the VDD monitor and the manual reset input MR - Nominal RESET pulse width 200ms RESET level valid for VDD>=1.2V Operating Temperature Range -55oC to +125oC Low Power, Typical 400uA Operational environment: - Total dose: 300 krad(Si) - SEL Immune: <110 MeV-cm2/mg @125oC - SET Immune: <80 MeV-cm2/mg Packaging options: - 8-lead dual-in-line flatpack Standard Microelectronics Drawing (SMD) 5962-11213 - QML Q and V The UT01VS50L’s function is to monitor vital supply and signal voltages in microprocessor systems. It provides for safe reset during power up, power down and brownout conditions by using an internal precision voltage reference. The UT01VS50L monitors activity at an independent watchdog input by employing an internal timer and a watchdog output that goes low if the input is not toggled within 1.6s. It provides for precision voltage threshold detection on an independent voltage input which could be used for battery or supply-low monitoring of a supply voltage other than VDD. The UT01VS50L includes an active low manual reset with an internal pull-up. APPLICATIONS Voltage Supervisor function for various systems including microprocessors, microcontrollers, DSPs and FPGAs Critical battery and power supply monitoring Replacement of older discrete solutions to improve reliability, accuracy and reduce complexity of the systems WDO RESET & DIGITAL CONTROL MR VDD RESET + - WDI TIMER 4.65 V GND VREF 1.25 V WDI TRANSITION DETECTOR OSC WDI - PFO PFI + Figure 1. UT01VS50L Functional Block Diagram 1 PIN DESCRIPTIONS Number Pins Type Description 1 MR Digital Input TTL/CMOS compatible Manual Reset Input with an internal pull-up. Active low. MR low forces the reset output RESET low. Required minimum MR pulse width is 150ns. RESET is held low for duration of the reset timer. 2 VDD Supply Power supply. Operating voltage range is 4.75V to 5.5V. VDD level is monitored internally by a dedicated comparator circuit, which employs an internal bandgap voltage reference nominally equal to 1.25V. Every time VDD falls below the threshold voltage, nominally 4.65V, RESET and WDO outputs are forced low. (See WDO and RESET descriptions.) (Figure 4.) 3 GND Supply ASIC Ground. This pin should be tied to ground and establishes the reference for voltage detection. 4 PFI Analog Input Threshold detector input. Voltage on this input is fed directly to an internal comparator where it is compared to the bandgap voltage reference of 1.25V. It can be used for detection of low battery or power failure of voltage supplies other than VDD. When voltage at PFI input drops below its threshold value of 1.25V, PFO output is forced low, otherwise, stays high. 5 PFO Digital Output Threshold detector output. Active low, push-pull output driver. It responds directly to PFI input. If PFI voltage is below the bandgap reference voltage, PFO is low. If PFI is above the reference voltage, PFO output is high. 6 WDI Digital Input Watchdog timer input pin. This pin is typically used to monitor microprocessor activity. It can assume three states: low, high and float. If WDI is floating or connected to a high impedance three state buffer, the watchdog timer is not active, and the corresponding watchdog output WDO is high. Watchdog timer is also not active any time RESET is low. Providing that RESET is not asserted, any change of state at WDI that is longer than 50ns will start the timer, or restart it, if the timer is already running (Figure 3.). If there is no activity within the timeout period, nominally 1.6sec, the timer will stop running and WDO output will go low (Figure 3). 7 RESET Digital Output Reset output. Active low, push-pull output driver. This output responds to both: VDD monitoring circuits and the manual reset input MR. On power up, RESET is guaranteed to be logic low for all VDD values from 1.2V up to the reset threshold, nominally 4.65V. Once this threshold is reached, an internal RESET timer is activated. During the countdown RESET output is kept low. It is raised high upon completion of countdown, typically after 200ms. If a brown out condition occurs during the reset timer countdown, the reset timer would be reset and another countdown would start after VDD levels were restored above the reset threshold. On power down, when VDD falls below the threshold voltage, RESET goes low and is guaranteed to stay low until VDD drops below 1.2V. If MR is asserted low, RESET is forced low and the reset timer is kept reset. When MR is released high, the timer is activated and RESET is kept low until completion of the reset timeout, when it is raised high. 2 Number Pins Type Description 8 WDO Digital Output Watchdog output. Active low, push-pull output driver. This pin is usually connected to a non-maskable interrupt input of a microprocessor. On power up, WDO responds to VDD monitoring circuitry. It stays low until the reset threshold, 4.65V nominally, is reached. At that point, WDO is raised high. The internal watchdog timer is activated after RESET is released. If there is no activity on WDI input, WDO goes low after the watchdog timer times out, which is typically after 1.6sec. Any activity on WDI will force WDO output to go high and the watchdog timer will be activated. If WDI is floating or connected to a high impedance buffer output, the timer is kept in a reset state and WDO stays high. When VDD drops below 4.65V, WDO goes low regardless of whether the watchdog timer has timed out or not. RESET goes low simultaneously which prevents an interrupt. If WDI input is left unconnected, WDO can be used as a low line output. Since a floating WDI disables the internal watchdog timer, WDO goes low when VDD drops below 4.65V, thus, functioning as a low line output. (Figure 4.) MR VCC 1 8 WDO 2 7 RESET UT01VS50L GND 3 6 WDI PFI 4 5 PFO Figure 2. UT01VS50L Pin Configuration 3 OPERATIONAL ENVIRONMENT PARAMETER LIMIT UNITS Total Ionizing Dose (TID) 300 krad(Si) Single Event Latchup Immune (SEL) <110 MeV-cm2/mg Single Event Transient Immune (SET) <80 MeV-cm2/mg ABSOLUTE MAXIMUM RATINGS 1 (Referenced to GND) SYMBOL LIMITS UNITS Voltage supply 7.2 V TJ Maximum junction temperature 175 °C T Storage temperature -65 to +150 °C PD Power dissipation 2.5 W Vin Input voltages -0.3V to (VDD+0.3V) V +300 °C 15 °C/W 1000 V VDD PARAMETER Tiead Lead Temperature (soldering, 10 seconds) ΘJC Thermal resistance, junction-to-case VESD ESDHBM Notes: 1. Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions beyond limits indicated in the operational sections of this specification is not recommended. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS SYMBOL PARAMETER LIMITS UNITS VDD Positive supply voltage 4.75 to 5.5 V TC Case temperature range -55 to +125 °C GND Negative supply voltage 0.0 V 4 ELECTRICAL CHARACTERISTICS 1,2 (VDD = 4.75V to 5.5V:-55°C < TC < +125°C) SYMBOL PARAMETER CONDITION MIN MAX UNIT 530 μA 0.8 V Power Supply IDD VDD supply current VDD=5.5V Digital Inputs and Outputs (MR, RESET, WDI, WDO, PFO) VIL Digital input low VDD=4.75V VIH Digital input high VDD=5.5V VIL_MR Manual reset input low VDD=4.75V VIH_MR Manual reset input high VDD=5.5V VOL3 Digital output low VDD=4.75V, IOL =3.2mA VOH3 Digital output high VDD=4.75V, IOH =800μA 3.5 V 0.8 2.0 V V 0.4 VDD - 1.5 V V Timing and Threshold Voltages VDD falling reset assertion VDD < 4.5V 0.2 0.8 μs tRS Reset pulse width VDD=4.75V 140 280 ms tWD Watchdog time-out period VDD=5.5V 1.0 2.25 s tWP Watchdog input pulse width VDD=4.75V, VIL = 0.4V, VIH =0.8XVDD 50 VRT Reset threshold voltage 4.5 Reset threshold voltage hysteresis 20 mV 150 ns tRST-ASSRT4 VRTHYS tMR Manual reset (MR) input pulse width VDD=4.75V tMD Manual reset (MR) to reset out delay VDD=4.75V IPFI4 Threshold detector input (PFI) current VDD=5.5V VPFI Threshold detector input (PFI) threshold voltage IMR IWDI ns 4.75 V 100 ns -20 20 nA VDD=5.0V 1.20 1.30 V Manual reset pull-up current VDD=5.5V, MR=0.0V -500 -100 μA Watchdog input (WDI) current WDI pin = VDD = 5.5V WDI pin = 0V; VDD = 5.5V 35 -35 μA μA Analog Input PFI tRPFI PFI rising threshold crossing to PFO delay 15 μs tFPFI PFI falling threshold crossing to PFO delay 35 μs 5 Notes: 1. For devices procured with a total ionizing dose tolerance guarantee, the post-irradiation performance at 25oC per MIL-STD-883 Method 1019, Condition A, up to the maximum TID level procured (see ordering information). 2. Unless otherwise specified, VDD = 4.75V to 5.5V, -55°C < TC < +125°C. RESET is the only parameter operable within 1.2V and the minimum recommended operating supply voltage. 3. VOL, VOH characteristics apply to WDO, PFO and RESET 4. Guaranteed by design, but not tested. 6 tMR VDD MR GND tWP tWD tWD VDD WDI GND tWD VDD WDO GND tMD tRS VDD RESET GND Figure 3. WDI and WDO timing waveforms. Reset externally triggered by MR. VDD VDD 4.65V 4.65V GND tRST_ASSRT tRS tWD tRS tWD VDD RESET GND tMD VDD MR GND tMR WDI VDD GND VDD WDO GND Figure 4. RESET and WDO are driven low for VDD <4.65 volts. WDO is driven high when MR is low. 7 VDD 5V VDD VIN_ANALOG R1 R2 uP 1 MR WDO 8 2 VDD RESET 7 RESET 3 GND WDI 6 I/O 4 PFI PFO 5 VTH= (R1+R2)/R2 ) * VPFI VPFI=1.25V +/- 50mV Figure 5. UT01VS50L Under Voltage Monitor and Detection Shown in Figure 5 is an application for monitoring the under voltage of a power supply connected to a microprocessor or ASIC. If the analog voltage monitored falls below the desired threshold value, the PFO output connected to the MR input will transition low causing the RESET output to be asserted low indicating an under voltage condition. 3.3V_REG VDD_IO VREG 3.3V VDD 5V VIN EN UT01VS50L R1 VTH= (R1+R2)/R2 ) * VPFI VPFI=1.25V +/- 50mV R2 1 MR WDO 8 2 VDD RESET 7 3 GND WDI 6 4 PFI PFO 5 VOUT RESET VREG 2.5V WDI OPEN VIN VOUT 2.5V_REG VDD 5V Tolerant CMOS AND GATE EN 1 MR WDO 8 2 VDD RESET 7 3 GND WDI 6 4 PFI PFO 5 R6 VTH= (R3+R4)/R4 ) * VPFIR3 VPFI=1.25V +/- 50mV R4 R7 3.3V REG LED 2.5V REG LED UT01VS50L Figure 6. Under Voltage Monitoring and sequencing of 3.3V and 2.5V Power Supplies Shown in Figure 6 are two Voltage Supervisors configured to monitor both the 3.3V and 2.5V power supplies of a system. The 3.3V regulated supply is monitored by the PFI pin of the top Voltage Supervisor, while the 2.5 V regulated supply is monitored by the PFI pin of the bottom Voltage Supervisor. The cross coupled connection of PFO to MR assures that RESET will be asserted when a brown out occurs on either the 3.3V or 2.5V regulated supplies. 8 VDD 5V R1 R2 VDD 1 MR WDO 2 VDD RESET 7 3 GND WDI 6 4 PFI PFO 5 uP 8 RESET I/O VTH= (R1+R2)/R2 ) * VPFI VPFI=1.25V +/- 50mV Figure 7. UT01VS50L Over Voltage Power Supply Monitoring and Reset Shown in Figure 7 is an application to monitor and detect power supply over voltage through the use of the PFI pin. When the voltage at the PFI input, (VTH) exceeds VREF, (1.2 to 1.3V) the PFO output transitions from low to high causing the MR output to transition from high to low. This asserts a RESET indicating the voltage being monitored has exceeded the over voltage monitor limit. 9 VDD 5V VDD R1 R2 1 MR WDO 8 2 VDD RESET 7 3 GND WDI 6 4 PFI PFO uP RESET I/O 5 UT01VS50L UNDER VOLTAGE MONITOR 5V AND GATE VTH_UND= (R1+R2)/R2 ) * VPFI VPFI=1.25V +/- 50mV 1 MR WDO 8 2 VDD RESET 7 3 GND WDI 6 4 PFI PFO 5 R3 R4 RESET I/O VTH_OV= (R3+R4)/R4 ) * VPFI VPFI=1.25V +/- 50mV UT01VS50L OVER VOLTAGE MONITOR Figure 8. UT01VS50L Over Voltage Power Supply Monitoring and Reset Shown in Figure 8 is an application using two UT01VS50L Voltage Supervisors to monitor both under voltage and over voltage of a power supply. In this application the top Voltage Supervisor monitors the under-voltage of a 5V power supply while the bottom Voltage Supervisor monitors the over voltage of the same 5V power supply. The 5V supply is monitored through the PFI input of both Voltage Supervisors. Resistor values for both under voltage and over voltage monitoring can be set to accommodate a range of power supply voltages. During normal operation where VDD is within the allowed range (VDD_UND < VDD < VDD_OV), RESET of both Voltage Supervisors will be at logic high level. The Table 1 below shows the truth table for functional, under voltage detection and over voltage detection. 10 Table 1. Under Voltage Over Voltage Truth Table VDD PFO_UND PFO_OV RESET_UND RESET_OV RESET uP or ASIC Mode Normal Operation VDD < VDD_UND VDD > VDD_OV HIGH LOW HIGH LOW LOW HIGH HIGH LOW HIGH HIGH HIGH LOW HIGH LOW LOW Normal Reset Asserted Reset Asserted 11 Figure 5. 8-pin Dual-In-Line Flatpack 12 ORDERING INFORMATION UT01VS50L VOLTAGE SUPERVISOR UT****** * * * * * Lead Finish: (Notes: 1) (C) = Gold Screening Level: (Notes: 2 and 3) (P) = Prototype Flow (C) = HiRel Flow (Temperature range -55oC to +125oC) Case Outline: (X) = 8-lead Ceramic Flat Package TID Tolerance: (-) = None Device Type (L) = Active low push-pull RESET Generic UT01VS50 part number: (01VS50) Notes: 1. Lead finish is "C" (Gold) only. 2. Prototype flow per Aeroflex Manufacturing Flows Document. Devices are tested at 25°C only. Lead finish is Gold "C" only. Radiation neither tested nor guaranteed. 3. HiRel Flow per Aeroflex Manufacturing Flows Document. Radiation neither tested nor guaranteed. 13 UT01VS50L VOLTAGE SUPERVISOR 5962 * ***** ** * * * Lead Finish: (NOTE: 1) (C) = Gold Case Outline: (X) = 8-Lead Ceramic Flatpack Screening Level: (Q) = QML Class Q (V) = QML Class V Device Type: (13) = UT01VS50L (Temperature Range: -55oC to +125oC) Drawing Number: 11213 = 5.0V Single Channel Voltage Supervisor Total Dose: (R) = 100 krad(Si) (F) = 300 krad(Si) Federal Stock Class Number: No Options Notes: 1. Lead finish is “C” (gold) only. 14 Aeroflex Colorado Springs - Datasheet Definition Advanced Datasheet - Product In Development Preliminary Datasheet - Shipping Prototype Datasheet - Shipping QML & Reduced Hi-Rel COLORADO Toll Free: 800-645-8862 Fax: 719-594-8468 INTERNATIONAL Tel: 805-778-9229 Fax: 805-778-1980 NORTHEAST Tel: 603-888-3975 Fax: 603-888-4585 SE AND MID-ATLANTIC Tel: 321-951-4164 Fax: 321-951-4254 WEST COAST Tel: 949-362-2260 Fax: 949-362-2266 CENTRAL Tel: 719-594-8017 Fax: 719-594-8468 www.aeroflex.com [email protected] Aeroflex Colorado Springs, Inc., reserves the right to make changes to any products and services herein at any time without notice. Consult Aeroflex or an authorized sales representative to verify that the information in this data sheet is current before using this product. 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