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STM1815RWX7F

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STM1815RWX7F

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Part Number STM1815RWX7F
Manufacturer STMicroelectronics
Description IC RESET CIRCUIT 2.55V PP SOT-23
Datasheet STM1815RWX7F Datasheet
Package TO-236-3, SC-59, SOT-23-3
In Stock 414 piece(s)
Unit Price $ 0.2262 *
Lead Time Can Ship Immediately
Estimated Delivery Time Jul 9 - Jul 14 (Choose Expedited Shipping)
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Part Number # STM1815RWX7F (PMIC - Supervisors) is manufactured by STMicroelectronics and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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STM1815RWX7F Specifications

ManufacturerSTMicroelectronics
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet STM1815RWX7FDatasheet
PackageTO-236-3, SC-59, SOT-23-3
Series-
TypeSimple Reset/Power-On Reset
Number of Voltages Monitored1
OutputPush-Pull, Totem Pole
ResetActive Low
Reset Timeout100 ms Minimum
Voltage - Threshold2.55V
Operating Temperature-40°C ~ 105°C (TA)
Mounting TypeSurface Mount
Package / CaseTO-236-3, SC-59, SOT-23-3
Supplier Device PackageSOT-23-3

STM1815RWX7F Datasheet

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September 2010 Doc ID11464 Rev 8 1/25 1 STM1810 STM1811 STM1812 STM1813 STM1815 STM1816 STM1817 STM1818 Low power reset circuit Features ■ Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages ■ Four output configurations: – Push-pull, active-high (STM1812,1817) – Push-pull, active-low (STM1810,1815) – Open-drain, active-low (STM1811,1816) – Open-drain, active-low with push-button detect (STM1813,1818) ■ Reset pulse width - 100 ms (min.) ■ Low supply current - 4 µA (typ.) ■ Guaranteed assertion down to VCC = 1.0 V (0 °C to 105 °C) ■ Factory-trimmed reset thresholds of 2.55 V, 2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ.) ■ Power supply transient immunity ■ Push-button/manual reset detect (STM1813/1818) ■ Operating temperature: –40 °C to 105 °C ■ ± 2.5% reset threshold accuracy: (–40 °C to 105 °C) ■ Available in the SOT23-3 package ■ Fully compatible with DS181x and MXD181x products. SOT23-3 (WX) Table 1. Device summary Order codes 5 V 3.3 V/ 3.0 V Active-low reset (push-pull) Active-low reset (open-drain) Active-high reset (push-pull) Active-low reset (open-drain, bidirectional, with MR detect) STM1810L/M ✔ ✔ STM1811L/M ✔ ✔(1) STM1812L/M ✔ ✔ STM1813L/M ✔ ✔ STM1815T/S/R ✔ ✔ STM1816T/S/R ✔ ✔(1) STM1817T/S/R ✔ ✔ STM1818T/S/R ✔ ✔ 1. Active-low RST with internal pull-up resistor. www.st.com

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Contents STM1810/1811/1812/1813/1815/1816/1817/1818 2/25 Doc ID11464 Rev 8 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Functional block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2.1 Active-low RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2.2 Active-low RST output (open-drain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2.3 Active-high RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.2.4 Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with manual reset detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.2.5 VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.2.6 VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Push-button detect reset (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3 Interfacing to bidirectional microcontrollers (MCU’s) . . . . . . . . . . . . . . . . . 9 2.4 Negative going VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.5 Valid RST output down to VCC = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.1 ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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STM1810/1811/1812/1813/1815/1816/1817/1818 List of tables Doc ID11464 Rev 8 3/25 List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. STM1810/STM1815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 4. STM1811/STM1816 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 5. STM1812/STM1817 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 6. STM1813/STM1818 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 7. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 8. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 9. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 10. SOT23-3 – 3-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 21 Table 11. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 12. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 13. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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List of figures STM1810/1811/1812/1813/1815/1816/1817/1818 4/25 Doc ID11464 Rev 8 List of figures Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. SOT23-3 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 3. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 4. Push-pull active-low output (STM1810/1812/1815/1817). . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 5. Open-drain, active-low output (STM1811/1816). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 6. Open-drain, active-low output (bidirectional, manual reset detect, STM1813/1818) . . . . . . 7 Figure 7. Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 8. Push-button manual reset with MR detect (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 9. Manual reset timing diagram, switch bounce/debounce (STM1813/1818). . . . . . . . . . . . . 11 Figure 10. Interfacing MCUs with bidirectional reset pins (RST, open-drain, STM1811/1816) . . . . . . 11 Figure 11. Valid reset (RST) output down to VCC = 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 12. Valid reset (RST) output down to VCC = 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 13. Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 14. Normalized reset time-out period (trec) vs. temperature - VOD = VTH – VCC . . . . . . . . . . . 13 Figure 15. VCC-to-reset output delay vs. temperature - VOD = VTH – VCC . . . . . . . . . . . . . . . . . . . . . 14 Figure 16. Voltage output low vs. ISINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 17. Voltage output high vs. ISOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 18. Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 19. Max. transient duration NOT causing reset pulse vs. reset threshold overdrive. . . . . . . . . 16 Figure 20. AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 21. SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 20

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STM1810/1811/1812/1813/1815/1816/1817/1818 Description Doc ID11464 Rev 8 5/25 1 Description STM181x devices are low power reset devices used to monitor power supplies for microcontrollers. They perform a single function: asserting a reset signal whenever VCC supply voltage drops below a preset value and keeping it asserted until VCC has risen above the preset threshold for a minimum period of time (trec). They provide excellent circuit reliability without additional external components when used with +3.0 V / +3.3 V (STM1815–STM1818), and +5 V (STM1810–STM1813) power supply systems. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition occurs, the reset output (RST) is forced low (or high in the case of RST) and remains asserted for trec after VCC rises above the reset threshold. The STM1813/1818 also keep reset asserted for trec after the output is momentarily pulled to ground by an external push-button switch. The STM1812 and STM1817 have an active-high, push-pull output. The STM1810 and STM1815 (push-pull) and STM1811, STM1813, STM1816, and STM1818 (open-drain) have an active-low RST output. The open-drain devices (STM1811 / STM1813 / STM1816 / STM1818) also have an internal pull-up resistor to VCC. The STM1813 and STM1818 feature a debounced manual reset feature that asserts a reset if the RST pin is pulled low for more than 1.5 µs. When used to initiate manual reset, RST debounces signals from devices such as mechanical switches. For devices with this feature, the release of the external switch triggers the reset period. The STM181x devices are guaranteed to output the correct logic state for VCC down to 1.0 V (0 °C to +105 °C). They also provide a reset comparator designed to ignore fast transients on VCC. Reset thresholds are available between +2.55 V and +4.62 V. These small, low power devices are ideal for use in portable equipment. All are available in the space-saving 3-pin SOT23 package, and are specified from –40 °C to +105 °C. Figure 1. Logic diagram 1. For STM1812, STM1817.

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Description STM1810/1811/1812/1813/1815/1816/1817/1818 6/25 Doc ID11464 Rev 8 Figure 2. SOT23-3 connections 2. RST for STM1812 and STM1817. Figure 3. Hardware hookup 1. RST for STM1812 and STM1817 (see Table 1). 2. Only valid for STM1813 and STM1818. Table 2. Signal names Symbol Description VSS Ground RST Active-low reset output RST(1) 1. For STM1812, STM1817. Active-high reset output VCC Supply voltage and input for reset threshold monitor

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STM1810/1811/1812/1813/1815/1816/1817/1818 Description Doc ID11464 Rev 8 7/25 1.1 Functional block diagrams Figure 4. Push-pull active-low output (STM1810/1812/1815/1817) 1. RST for STM1812 and STM1817. Figure 5. Open-drain, active-low output (STM1811/1816) 1. 5.5 kΩ internal pull-up resistor. Figure 6. Open-drain, active-low output (bidirectional, manual reset detect, STM1813/1818) 1. 5.5 kΩ internal pull-up resistor. 1.2 Pin descriptions See Figure 1 and Table 2 for a brief overview of the signals connected to this device. 1.2.1 Active-low RST output (push-pull) Pulses low when VCC drops below VRST, and stays low as long as VCC is below the reset threshold. It remains low for trec after VCC rises above the reset threshold. 1.2.2 Active-low RST output (open-drain) Pulses low when VCC drops below VRST, and stays low as long as VCC is below the reset threshold. It remains low for trec after VCC rises above the reset threshold. RST output has an internal 5.5 kΩ pull-up resistor.

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Description STM1810/1811/1812/1813/1815/1816/1817/1818 8/25 Doc ID11464 Rev 8 1.2.3 Active-high RST output (push-pull) Pulses high when VCC drops below VRST, and stays high as long as VCC is below the reset threshold. It remains high for trec after VCC rises above the reset threshold. 1.2.4 Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with manual reset detect Pulses low when VCC drops below VRST, or RST is externally pulled low for at least 1.5 µs. It remains low for tPBRST after VCC rises above the reset threshold, or after the external manual reset is released (see Figure 9). RST output has an internal 5.5 kΩ pull-up resistor. 1.2.5 VCC Supply voltage and input for VRST comparator. 1.2.6 VSS Ground, is the reference for the power supply. It must be connected to the system ground. Table 3. STM1810/STM1815 Pin Name Function 1 RST Active-low reset output (push-pull) 2 VCC Supply voltage and input for reset threshold monitor 3 VSS Ground Table 4. STM1811/STM1816 Pin Name Function 1 RST Active-low reset output (open-drain, with internal 5.5 kΩ pull-up resistor) 2 VCC Supply voltage and input for reset threshold monitor 3 VSS Ground Table 5. STM1812/STM1817 Pin Name Function 1 RST Active-high reset output (push-pull) 2 VCC Supply voltage and input for reset threshold monitor 3 VSS Ground Table 6. STM1813/STM1818 Pin Name Function 1 RST Active-low reset output (open-drain, with internal 5.5 kΩ pull-up) with push- button/manual reset detect 2 VCC Supply voltage and input for reset threshold monitor 3 VSS Ground

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STM1810/1811/1812/1813/1815/1816/1817/1818 Operation Doc ID11464 Rev 8 9/25 2 Operation 2.1 Reset output The STM181x asserts a reset signal to the microcontroller (MCU) whenever VCC goes below the reset threshold (VRST), and is guaranteed valid down to VCC = 1.0 V (0 °C to 105 °C). A microcontroller’s (MCU) reset input starts the MCU in a known state. The STM1810 - STM1813/ STM1815 - STM1818 low power reset circuits assert reset to prevent code-execution errors during power-up, power-down, and brownout conditions (Figure 7). During power-up, once VCC exceeds the reset threshold an internal timer keeps RST low for the reset time-out period, trec. After this interval, RST returns high. If VCC drops below the reset threshold, RST goes low. Each time RST is asserted, it stays low for at least the reset time-out period. Any time VCC goes below the reset threshold, the internal timer clears. The reset timer starts when VCC returns above the reset threshold. Reset trec is also triggered by an externally initiated rising edge on the RST pin (STM1813/STM1818), following a low signal of 1.5 µs minimum duration. 2.2 Push-button detect reset (STM1813/1818) Many systems require push-button reset capability (Figure 8), allowing the user or external logic circuitry to initiate reset. On the STM1813/STM1818, a logic low on RST held for greater than 1.5 µs asserts a reset. RST deasserts following a 100 ms minimum reset time- out delay (trec). A manual reset input shorter than 1.5 µs may release RST without the 100 ms minimum reset time-out delay. To facilitate use with mechanical switches, the STM1813/STM1818 contain internal debounce circuitry. A debounced waveform is shown in Figure 9 The RST output has an internal 5.5 kΩ pull-up resistor. 2.3 Interfacing to bidirectional microcontrollers (MCU’s) As the RST output on the STM1811/STM1816 is open-drain, these devices interface easily with MCU’s that have bidirectional reset pins. Connecting the µP supervisor’s reset (RST) output directly to the microcontroller’s reset (RST) pin allows either device to assert reset (Figure 10). No external pull-up resistor is required, as it is within the STM1811/STM1816. 2.4 Negative going VCC transients The STM181x are relatively immune to negative-going VCC transients (glitches). Figure 19 shows typical transient duration versus reset comparator overdrive (for which the STM181x will NOT generate a reset pulse). The graph was generated using a negative pulse applied to VCC, starting at 0.5 V above the actual reset threshold and ending below it by the magnitude indicated (comparator overdrive). The graph indicates the maximum pulse width a negative VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (further below the threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive which lies under the curve will NOT generate a reset signal. Typically, a VCC transient that goes 100 mV below the reset threshold and lasts 20 µs or less will not cause a reset pulse. A 0.1 µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity.

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