The TPS3809K33DBVR from Texas Instruments is a 3.3V fixed-threshold voltage supervisor with 200ms reset timeout in SOT-23-5. It provides precision monitoring with 1.5% threshold accuracy and 15uA supply current for MCU power-on reset.<\/p>\n
| \u0627\u0644\u0648\u0638\u064a\u0641\u0629<\/td>\n | Fixed-Voltage Supervisor (Reset IC)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Threshold Voltage<\/td>\n | 3.07V (fixed, -1.5%\/+1.5%)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Threshold Accuracy<\/td>\n | 1.5% (over temperature)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Reset Timeout<\/td>\n | 200ms (typ)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| \u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n | 2.0V to 6.5V<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Supply Current<\/td>\n | 15uA (typ)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| \u0646\u0648\u0639 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n | Active-Low, Open-Drain<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Reset Output<\/td>\n | Active low when VDD below threshold<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| MR Pin<\/td>\n | No (manual reset not available on K33)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| \u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n | SOT-23-5<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n | -40 to +125 C<\/td>\n<\/tr>\n<\/table>\n\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\nProduct Overview The TPS3809K33DBVR from Texas Instruments is a 3.3V fixed-threshold voltage supervisor with 200ms reset timeout in SOT-23-5. It provides precision monitoring with 1.5% threshold accuracy and 15uA supply current for MCU power-on reset. Key Specifications Function Fixed-Voltage Supervisor (Reset IC) Threshold Voltage 3.07V (fixed, -1.5%\/+1.5%) Threshold Accuracy 1.5% (over temperature) Reset Timeout 200ms […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[138],"class_list":["post-3749","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-ti"],"acf":{"brief_explanation":"3.3V fixed voltage supervisor, 3.07V threshold, 1.5% accuracy, 200ms timeout, SOT-23-5","date_code":"","package_case":"SOT-23-5 (2.9 x 1.6 x 1.3 mm)","in_stock":6639,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tps3809.pdf","price":"$0.57 @ 1ku","product_introduction":"The TPS3809K33DBVR from Texas Instruments is a micro-power voltage supervisor (reset IC) specifically designed for monitoring 3.3V power rails in microcontroller, DSP, and FPGA applications. The device features a factory-programmed threshold voltage of 3.07V with +\/-1.5% accuracy over the full -40 to +125C temperature range, providing reliable detection of brownout conditions on 3.3V supplies. When the supply voltage drops below the threshold, the open-drain RESET output asserts low, holding the system in reset. When the supply rises above the threshold plus hysteresis, an internal timer starts and holds RESET low for a fixed 200ms timeout period before releasing it high. This ensures the system has adequate time to stabilize before operation begins. The ultra-low supply current of 15uA typical makes the TPS3809 suitable for battery-powered applications where power consumption must be minimized. The open-drain output architecture allows the RESET line to be wire-ORed with other reset sources or connected to systems with different supply voltages. Built-in glitch immunity filters out short VDD transients that could cause false reset assertions. The TPS3809 is available in a compact SOT-23-5 package, making it ideal for space-constrained board designs. The K33 variant specifies a fixed 3.07V threshold for 3.3V rail monitoring; other variants provide thresholds from 1.2V to 5.0V.","working_principle":"The TPS3809K33DBVR operates as a precision voltage supervisor with fixed threshold and timeout. Key subsystems include: (1) Voltage Monitor - a precision bandgap reference and resistor divider set the threshold voltage to 3.07V; when VDD falls below this threshold, the comparator output changes state, asserting RESET low; a built-in hysteresis of approximately 30mV prevents chattering near the threshold; (2) Glitch Filter - an internal filter rejects short-duration VDD transients that fall below threshold for less than the filter time constant; this prevents false resets from supply noise spikes; (3) Reset Generator - when VDD is below threshold, the RESET output is actively pulled low (open-drain MOSFET on); when VDD rises above threshold, the reset generator starts the timeout counter; (4) Timeout Counter - an internal oscillator and counter generate a fixed 200ms delay from VDD crossing above threshold to RESET releasing high; this gives the monitored system time for oscillators to start and power rails to stabilize; the timeout is generated internally without external components; (5) Output Stage - an open-drain N-channel MOSFET pulls RESET low when asserted; an external pull-up resistor (typically 10k-100k) to the system logic supply sets the high-level voltage; this allows RESET to interface with logic at a different supply voltage than VDD.","pin_description":"
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