MIC2774L-46YM5-TR

MIC2774 Dual Micropower Low Voltage Supervisor Features General Description • Monitors Two Independent Power Supplies for Undervoltage Conditions • One Fixed and One User-Adjustable Input • Choice of Ten Factory-Programmed Thresholds • Adjustable Input can Monitor Supplies as Low as 0.3V • Generates 140 ms (min.) Power-On Reset Pulse • Manual Reset Input • Choice of Active-High, Active-Low, or Open-Drain Active-Low Reset Outputs • Inputs May be Pulled Above VDD (7V abs. max.) • /RST Output Valid Down to 1.2V • Ultra-Low Supply Current, 3.5 µA Typical • Rejects Brief Input Transients • IttyBitty 5-pin SOT-23 Package • Pin-Compatible upgrade for MAX6306/09/12 The MIC2774 is a dual power supply supervisor that provides undervoltage monitoring, manual reset capability, and power-on reset generation in a compact 5-pin SOT-23 package. Features include two undervoltage detectors, one fixed and one adjustable, and a choice of reset outputs. One undervoltage detector compares VDD against a fixed threshold. Ten factory-programmed thresholds are available. The second, user-adjustable input is compared against a 300 mV reference. This low reference voltage allows for the monitoring of voltages lower than those supported by previous supervisor ICs. Applications • Monitoring Processor ASIC or FPGA Core and I/O Voltages • PDAs, Handheld PCs • Embedded Controllers • Telecommunications Systems • Power Supplies • Wireless/Cellular Systems • Networking Hardware The reset outputs are asserted at power-on and at any time either voltage drops below the programmed threshold voltage and remains asserted for 140 ms (min.) after they subsequently rise back above the threshold boundaries. Manual reset functionality can be provided by a switch connected between ground and the /MR input. A wide choice of voltage thresholds provides for a variety of supply voltages and tolerances. Hysteresis is included to prevent chattering due to noise. Typical supply current is a low 3.5 µA. Package Types MIC2774 5-Lead SOT-23 (M5) (H Version) MIC2774 5-Lead SOT-23 (M5) (L and N Versions) /MR GND RST 1 2 3 /MR GND /RST 1 2 3 4 IN  2022 Microchip Technology Inc. 5 VDD 4 IN 5 VDD DS20006527A-page 1 MIC2774 Typical Application Circuit MIC2774 VCORE 1.0V VI/O 2.5V R1 MIC2774L-23 VDD /RST IN MICROPROCESSOR VCORE VI/O /RESET GND R2 POWER_GOOD /MR GND MANUAL RESET Functional Block Diagram VDD R VREF IN Q /RST* S /Q RST* ONE SHOT DELAY LINE VDD IPU VREF /MR MIC2774 GND Note: Pinout and polarity vary by device type. See the Product Identification System for details. DS20006527A-page 2  2022 Microchip Technology Inc. MIC2774 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Voltage (VDD) ................................................................................................................................ –0.3V to +7.0V Input Voltages (VIN, V/MR) ......................................................................................................................... –0.3V to +7.0V Output Voltages (V/RST, VRST) .................................................................................................................. –0.3V to +7.0V RST, (/RST) Current................................................................................................................................................20 mA ESD Rating (Note 1) ............................................................................................................................................... 1.5 kV Operating Ratings †† Supply Voltage (VDD) ................................................................................................................................ +1.5V to +5.5V Input Voltages (VIN, V/MR) ......................................................................................................................... –0.3V to +6.0V Output Voltage (V/RST, N Version) ............................................................................................................ –0.3V to +6.0V Output Voltage (V/RST, VRST, H & L Versions) ..................................................................................–0.3V to VDD + 0.3V † Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. †† Notice: The device is not guaranteed to function outside its operating ratings. Note 1: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series with 100 pF. ELECTRICAL CHARACTERISTICS Electrical Characteristics: TA = +25°C, bold values valid for –40°C ≤ TA ≤ +85°C, unless noted. Note 1, Note 2 Parameter Sym. Min. Typ. Max. Units IDD — 3.5 — µA VDD = VIN = VTH + 1.6%; Note 2; /MR, RST, /RST open VUV_THR VTH – 1.5% VTH VTH + 1.5% V See Table 5-1 VHYST — 1 — % — Undervoltage Threshold VREF 295 300 305 mV Note 2 Hysteresis Voltage VHYST — 3 — mV — — 5 — pA — — — 10 nA TMIN ≤ TA ≤ TMAX Supply Current Conditions VDD Voltage Threshold Undervoltage Threshold on VDD Hysteresis Voltage IN, Undervoltage Detector Input Input Current IIN RST, /RST Outputs Propagation Delay tPROP — 20 — µs VIN = (VREF(MAX) + 100 mV) to VIN = (VREF(MIN) – 100 mV), /MR = open Reset Pulse Width tRST 140 — 280 ms TMIN ≤ TA ≤ TMAX RST or /RST Output Voltage Low VOL — — 0.3 — — 0.3 Note 1: 2: 3: V ISINK = 1.6 mA; VDD ≥ 1.6V ISINK = 100 µA; VDD ≥ 1.2V; Note 3 Specification for packaged product only. VDD equals nominal “Typical Application (VDD)” as shown in Table 5-1. VDD operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to VDD = 1.2V.  2022 Microchip Technology Inc. DS20006527A-page 3 MIC2774 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Characteristics: TA = +25°C, bold values valid for –40°C ≤ TA ≤ +85°C, unless noted. Note 1, Note 2 Parameter Sym. RST or /RST Output Voltage High (H and L versions) VOH Min. Typ. Max. 0.8 × VDD — — 0.8 × VDD — — Units V Conditions ISOURCE = 500 µA; VDD ≥ 1.5V ISOURCE = 10 µA; VDD ≥ 1.2V; Note 3 /MR Inputs Input High Voltage VIH 0.7 × VDD — — V Note 2 Input Low Voltage VIL — — 0.3 × VDD V Note 2 Propagation Delay tPROP — 5 — µs V/MR < (VIL – 100 mV) Note 2 Minimum Input Pulse Width tMIN — 33 — ns Reset occurs, V/MR < VIL Internal Pull-Up Current IPU — 100 250 nA — Input Current, /MR IIN — 100 250 nA V/MR < VIL Note 1: 2: 3: Specification for packaged product only. VDD equals nominal “Typical Application (VDD)” as shown in Table 5-1. VDD operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to VDD = 1.2V. TEMPERATURE SPECIFICATIONS Parameters Sym. Min. Typ. Max. Units Conditions Operating Ambient Temperature Range TA –40 — +85 °C Note 1 Storage Temperature Range TS –65 — +150 °C — θJA — 256 — °C/W — Temperature Ranges Package Thermal Resistance Thermal Resistance, SOT-23 5-Ld Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability. VDD VHYST 0V VIN A VTH A A VREF 0V V/MR V/RST (ACTIVE LOW) VRST (ACTIVE HIGH) FIGURE 1-1: > tMIN VIH VIL VOH VHYST tRST tRST tRST VOL VOH VOL Timing Diagram. Note 1: Propagation delays not shown for clarity. 2: The MIC2774 ignores very brief transients. See the Application Information section for details. DS20006527A-page 4  2022 Microchip Technology Inc. MIC2774 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin Number MIC2774H Pin Number MIC2774L MIC2774N Pin Name 1 — RST Digital (Output): Asserted high whenever VIN or VDD falls below the threshold voltage. It will remain asserted for no fewer than 140 ms after VIN and VDD return above the threshold limits. Description — 1 /RST Digital (Output): Asserted low whenever VIN or VDD falls below the threshold voltage. It will remain asserted for no fewer than 140 ms after VIN and VDD return above the threshold limits. (Open-drain for “N” version, requires an external pull-up resistor). 2 2 GND Ground. Digital (Input): Driving this pin low initiates immediate and unconditional reset. Assuming VIN and VDD are above the thresholds when /MR is released (returns high), the reset output will be de-asserted no fewer than 140 ms later. /MR may be driven by a logic signal or a mechanical switch. /MR has an internal pull-up to VDD and may be left open if unused. 3 3 /MR 4 4 IN 5 5  2022 Microchip Technology Inc. VDD Analog (Input): The voltage on this pin is compared to the internal 300 mV reference. An undervoltage condition will trigger a reset sequence. Analog (Input): Power supply input for internal circuitry and input to the fixed voltage monitor. The voltage on this pin is compared against the internal reference. An undervoltage condition will trigger a reset sequence. DS20006527A-page 5 MIC2774 3.0 FUNCTIONAL DESCRIPTION 3.1 IN, Undervoltage Detector Input The voltage present at the IN pin is compared to the internal 300 mV reference voltage. A reset is triggered if and when VIN falls below VREF. Typically, a resistor divider is used to scale the input voltage to be monitored such that VIN will fall below VREF as the voltage being monitored falls below the desired trip-point. Hysteresis is employed to prevent chattering due to noise. The comparator on the IN pin is relatively immune to very brief negative-going transients. 3.2 VDD Input The VDD pin is both the power supply terminal and a monitored input voltage. The voltage at this pin is continually compared against the internal reference. The trip-point at which a reset occurs is factory-programmed. A reset is triggered if and when VDD falls below the trip-point. Hysteresis is employed to prevent chattering due to noise. The comparator on the VDD input is relatively immune to very brief negative-going transients. DS20006527A-page 6 3.3 RST, /RST Reset Output Typically, the MIC2774 is used to monitor the power supplies of intelligent circuits such as microcontrollers and microprocessors. By connecting the appropriate reset output of an MIC2774 to the reset input of a µC or µP, the processor will be properly reset at power-on, power-down, and during brown-out conditions. In addition, asserting /MR, the manual reset input, will activate the reset function. The reset output is asserted any time /MR is asserted, or if VIN or VDD drops below the corresponding threshold voltage. The reset output remains asserted for tRST(min) after VIN and/or VDD subsequently return above the threshold boundaries and/or /MR is released. A reset pulse is also generated at power-on. Hysteresis is included in the comparators to prevent chattering of the output due to noise. 3.4 /MR, Manual Reset Input The ability to initiate a reset via external logic or a manual switch is provided in addition to the MIC2774’s automatic supervisory functions. Driving the /MR input to a logic low causes an immediate and unconditional reset to occur. Assuming VIN and VDD are within tolerance when /MR is released (returns high), the reset output will be de-asserted no less than tRST later. /MR may be driven by a logic signal or mechanical switch. Typically, a momentary push-button switch is connected such that /MR is shorted to ground when the switch contacts close. Switch de-bouncing is performed internally; the switch may be connected directly between /MR and GND. /MR is internally pulled up to VDD and may be left open if unused.  2022 Microchip Technology Inc. MIC2774 4.0 APPLICATION INFORMATION 4.1 Programming the Voltage Threshold Referring to the Typical Application Circuit, the voltage threshold on the IN pin is calculated as follows: EQUATION 4-1: R1 + R2 V IH = V REF  -------------------R2 Where: VREF = 0.300V In order to provide the additional criteria needed to solve for the resistor values, the resistors can be selected such that the two resistors have a given total value; that is, R1 + R2 = RTOTAL. Imposing this condition on the resistor values provides two equations that can be solved for the two unknown resistor values. A value such as 1 MΩ for RTOTAL is a reasonable choice because it keeps quiescent current to a generally acceptable level while not causing any measurable errors due to input bias currents. The larger the resistors, the larger the potential errors due to input bias current (IIN). The maximum recommended value of RTOTAL is 3 MΩ. Applying this criteria and rearranging the VIH expression to solve for the resistor values gives: EQUATION 4-2: R TOTAL  V REF R2 = -------------------------------------V IH R1 = R TOTAL – R2 4.2 Application Example Figure 4-1 illustrates a hypothetical MIC2774L-23 application in which the MIC2774L-23 is used to monitor the core and I/O supplies of a high-performance CPU or DSP. The core supply, VCORE, in the example is 1.0V ±5%. The main power rail and I/O voltage, VI/O, is 2.5V ±5%. As shown in Figure 4-1, the MIC2774 is powered by VI/O. The minimum value of VI/O is 2.5V – 5% = 2.375V; the maximum is 2.5V + 5% = 2.625V. This is well within the device’s supply range of 1.5V to 5.5V.  2022 Microchip Technology Inc. Resistors R1 and R2 must be selected to correspond to the VCORE supply of 1.0V. The goal is to ensure that the core supply voltage is adequate to ensure proper operation; i.e., VCORE ≥ (1.0V – 5%) = 0.950V. Because there is always a small degree of uncertainty due to the accuracy of the resistors, variations in the device’s voltage reference, etc., the threshold will be set slightly below this value. The potential variation in the MIC2774’s voltage reference (VREF) is specified as ±1.5%. The resistors chosen will have their own tolerance specifications. This example assumes the use of 1% accurate resistors. The potential worst-case error contribution due to input bias current can be calculated once the resistor values are chosen. If the guidelines above regarding the maximum total value of R1 + R2 are followed, this error contribution will be very small thanks to the MIC2774’s very low input bias current. To summarize, the various potential error sources are: • Variation in VREF: specified at ±1.5% • Resistor tolerance: chosen by designer (typically ≤±1%) • Input bias current, IIN: calculated once resistor values are known, typically very small Taking the various potential error sources into account, the threshold voltage will be set slight below the minimum VCORE specification of 0.950V so that when the actual threshold voltage is at its maximum, it will not intrude into the normal operating range of VCORE. The target threshold voltage will be set as follows: Given that the total tolerance on VTH for the IN pin is [VREF tolerance] + [resistor tolerance] = ±1.5% + ±1% = ±2.5%, and VTH(max) = VCORE(min), then VCORE(min) = VTH + 2.5% VTH = 1.025 VTH, therefore, solving for VTH results in EQUATION 4-3: V CORE  MIN  0.950 V TH = ----------------------------- = ------------ = 0.9268V 1.025 1.025 Solving for R1 and R2 using this value for VTH and the equations above yields: R1 = 676.3 kΩ ≈ 673 kΩ R2 = 323.7 kΩ ≈ 324 kΩ The resulting circuit is shown in Figure 4-1. DS20006527A-page 7 MIC2774 4.3 Input Bias Current Effects Now that the resistor values are known, it is possible to calculate the maximum potential error due to input bias current, IIN. As shown in the Electrical Characteristics table, the maximum value of IIN is 10 nA. Note that the typical value is a much smaller 5 pA. The magnitude of the offset caused by IIN is given by: MICROPROCESSOR VCC VCC MIC2774N-XX VDD Nȍ /RST /RESET GND R1 IN R2 /MR GND EQUATION 4-4: FIGURE 4-2: Reset Pin. VERROR = ±1×10-8A × 2.189×105Ω VERROR = ±2.189×10-3V VERROR = ±2.189 mV The typical error is about three orders of magnitude lower than this—close to one microvolt. Generally, the error due to input bias can be discounted. If it is to be taken into account, simply adjust the target threshold voltage downward by this amount and recalculate R1 and R2. The resulting value will be very close to optimum. If accuracy is more important than the quiescent current in the resistors, simply reduce the value of RTOTAL to minimize offset errors. VCORE 1.0V 5% R1 Nȍ 1% R2 Nȍ 1% VCORE VI/O MIC2774L-23 VDD IN /MR /RST /RESET GND GND 4.4 The MIC2774 is inherently immune to very short negative-going glitches. Very brief transients may exceed the voltage thresholds without tripping the output. In general, as shown in Figure 4-3 and Figure 4-4, the narrower the transient, the deeper the threshold overdrive that the MIC2774 will ignore. The graphs represent the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset. 40 35 30 25 20 15 10 5 0 0 100 200 300 RESET COMP. OVERDRIVE, VREF - VIN (mV) FIGURE 4-3: Response. MANUAL RESET FIGURE 4-1: Transient Response MIC2774 Example Design. Interfacing to Processors with Bidirectional Reset Pins Some microprocessors have reset signal pins that are bidirectional, rather than input-only. The Motorola 68HC11 family is one example. Because the MIC2774N’s output is open-drain, it can be connected directly to the processor’s reset pin using only the pull-up resistor normally required. See Figure 4-2. MAX. TRANSIENT DURATION (μs) VI/O 2.5V 5% MICROPROCESSOR 4.5 MAX. TRANSIENT DURATION (μs) VERROR = IIN(max) × (R1||R2) Interfacing to Bidirectional Typical Input Transient 100 80 60 40 20 0 0 500 1000 1500 2000 RESET COMP. OVERDRIVE, VREF - VDD (mV) FIGURE 4-4: Response. DS20006527A-page 8 Typical VDD Transient  2022 Microchip Technology Inc. MIC2774 4.6 Ensuring Proper Operation at Low Supply At VDD levels below 1.2V, the MIC2774’s reset output cannot turn on sufficiently to produce a valid logic-low on /RST. In this situation, circuits driven by /RST could be allowed to float, causing undesired operation. In most cases, however, it is expected that the circuits driven by the MIC2774L will be similarly inoperative at VDD ≤ 1.2V. If a given application requires that /RST be valid below VDD = 1.2V, this can be accomplished by adding a pull-down resistor to the /RST output. A value of 100 kΩ is recommended because this is usually an acceptable compromise of quiescent current and pull-down current. The resistor’s value is not critical, however. See Figure 4-5. These statements also apply to the MIC2774H’s RST output. That is, to ensure valid RST signal levels at VDD < 1.2V, a pull-up resistor (as opposed to a pull-down) should be added to the RST output. A value of 100 kΩ is typical for this application, as well. See Figure 4-6. MICROPROCESSOR VCC VCC R1 MIC2774L-XX VDD /RST IN R2 /MR /RESET GND Nȍ R PULL-DOWN GND MANUAL RESET FIGURE 4-5: 1.2V. MIC2774L Valid /RST Below MICROPROCESSOR VCC VCC R1 MIC2774H-XX VDD RST IN Nȍ R PULL-UP RESET GND R2 /MR GND MANUAL RESET FIGURE 4-6: 1.2V. MIC2774H Valid RST Below  2022 Microchip Technology Inc. DS20006527A-page 9 MIC2774 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 5-Lead SOT-23* Example XXXX UH22 5-Lead SOT-23* Example H Version, Front L Version, Front UI31 XXXX 5-Lead SOT-23* Example XXXX UG46 N Version, Front Legend: XX...X Y YY WW NNN e3 * Example 5-Lead SOT-23* H Version, Back NNN 4L4 Example 5-Lead SOT-23* L Version, Back NNN T08 Example 5-Lead SOT-23* N Version, Back NNN 92F Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. ●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle mark). Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo. Underbar (_) and/or Overbar (‾) symbol may not be to scale. DS20006527A-page 10  2022 Microchip Technology Inc. MIC2774 TABLE 5-1: STANDARD VOLTAGE OPTIONS Voltage Code Typical Application (VDD) Nominal Threshold Voltage (VTH) 46 5.0V ±5% 4.68V 44 5.0V ±10% 4.43V 31 3.3V ±5% 3.09V 29 3.3V ±10% 2.93V 28 3.0V ±5% 2.81V 26 2.85V ±5% 2.67V 25 2.7V ±5% 2.53V 23 2.5V ±5% 2.34V 22 2.4V ±5% 2.25V 17 1.8V ±5% 1.69V  2022 Microchip Technology Inc. DS20006527A-page 11 MIC2774 5-Lead SOT-23 Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. DS20006527A-page 12  2022 Microchip Technology Inc. MIC2774 APPENDIX A: REVISION HISTORY Revision A (May 2022) • Converted Micrel document MIC2774 to Microchip data sheet template DS20006527A. • Minor grammatical text changes throughout.  2022 Microchip Technology Inc. DS20006527A-page 13 MIC2774 NOTES: DS20006527A-page 14  2022 Microchip Technology Inc. MIC2774 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. Device X -XX X XX -XX Part No. Reset Output Voltage Code Temp. Range Package Media Type Device: MIC2774: Reset Output: H L N = = = Push-Pull Active-High (RST) Push-Pull Active-Low (/RST) Open-Drain Active-Low (/RST) Voltage Code: 46 44 31 29 28 26 25 23 22 17 = = = = = = = = = = 4.68V 4.43V 3.09V 2.93V 2.81V 2.67V 2.53V 2.34V 2.25V 1.69V Temperature Range: Y = –40°C to +85°C Package: M5 = 5-Lead SOT-23 Media Type: TR = 3,000/Reel Dual Micro-Power Low Voltage Supervisor Examples: a) MIC2774H-17YM5-TR: MIC2774, Push-Pull ActiveHigh, 1.69V, –40°C to +85°C, 5-Lead SOT-23, 3,000/Reel b) MIC2774H-31YM5-TR: MIC2774, Push-Pull ActiveHigh, 3.09V, –40°C to +85°C, 5-Lead SOT-23, 3,000/Reel c) MIC2774L-23YM5-TR: MIC2774, Push-Pull ActiveLow, 2.34V, –40°C to +85°C, 5-Lead SOT-23, 3,000/Reel d) MIC2774L-46YM5-TR: MIC2774, Push-Pull ActiveHigh, 4.68V, –40°C to +85°C, 5-Lead SOT-23, 3,000/Reel e) MIC2774N-26YM5-TR: MIC2774, Open-Drain Active-Low, 1.69V, –40°C to +85°C, 5-Lead SOT-23, 3,000/Reel f) MIC2774N-44YM5-TR: MIC2774, Open-Drain Active-Low, 4.43V, –40°C to +85°C, 5-Lead SOT-23, 3,000/Reel Note 1:  2022 Microchip Technology Inc. Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option. DS20006527A-page 15 MIC2774 NOTES: DS20006527A-page 16  2022 Microchip Technology Inc. Note the following details of the code protection feature on Microchip products: • Microchip products meet the specifications contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and under normal conditions. • Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is “unbreakable”. Code protection is constantly evolving. Microchip is committed to continuously improving the code protection features of our products. This publication and the information herein may be used only with Microchip products, including to design, test, and integrate Microchip products with your application. Use of this information in any other manner violates these terms. Information regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. 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