KB809 KINGBOR | Alldatasheet

Document overview

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Technical content

The KB809 is a power supply supervisor that provides under-voltage monitoring and power-on reset generation in an industry standard 3-pin SOT package and pinout. The reset output is asserted at power-on and any time the input voltage drops below the programmed threshold. It remains asserted for 180ms (typ.) after the input subsequently rises back above the threshold boundary. The KB809 has an active-low reset output. Hysteresis is included to prevent chattering due to noise, and the KB809 is inherently immune to brief power supply transients. Typical supply current is a low 3 µA. For those applications that require a manual reset function, see the KB811/812. For those appli- cations that require a longer reset timeout, see the KB809. (The KB809 is identical to the industry- standard KB809 with the exception of a shorter reset timout.) /K56/K43/K43 /K2F/K52/K45/K53/K45/K54 /KB5/K50 /K2F/K52/K45/K53/K45/K54 /K56/K43/K43 /K56 /K43/K43 Typical Operating Circuit

  • Under-voltage monitor
  • Power-on reset generation (180ms Typ)
  • Choice of threshold voltages (contact Kingbor regarding availability)
  • Active-low reset output
  • No external components required
  • Rejects brief input transients
  • Industry standard package and pinout
  • 3-pin SOT23-3 package
  • Monitoring processor, ASIC, or FPGA core and I/O voltages
  • PDAs, hand-held PCs
  • Embedded controllers
  • Telecommunications systems
  • Power supplies
  • Wireless / Cellular systems
  • Networking hardware Typical Nominal Junction Part Number Marking** Application Threshold T RST (ms) Temperature Package Voltage* Voltage Range KB809-293 ADAA C956 3.3V ±5% 2.93 180 –40 °C to +85°C SOT23-3 Microprocessor Reset circuits KB809 Kingbor Technology Co.,Ltd TEL:(86)0755-83095458 FAX:(86)0755-88364052 KB809 General Description Features

Applications

Ordering Information

Typical Application Block Diagrams Typical Nominal Junction Part Number Marking** Application Threshold T RST (ms) Temperature Package Voltage* Voltage Range KB809-263 AFAA C756 3.3V ±10% 2.63 180 –40 °C to +85°C SOT23-3 Top Marking: ADAA & AFAA: To manufacture marking after 2007-3-15 C956 & C756: Before 2007-3-15

2 March 2007

Pin Number Pin Name Pin Function 1 GND Ground return for all IC functions. 2 /RESET Digital Output. Active-low. Asserted whenever V CC falls below the threshold voltage. It will remain asserted for no less than 180ms and be de-asserted after VCC returns above the threshold. 3 VCC Analog Input. Power supply input to the IC. /K31/K47/K4E/K44 /K2F/K52/K45/K53/K45/K54 /K56/K43/K43/K33 /K32 KB809 3-Lead SOT23 KB809 Kingbor Technology Co.,Ltd TEL:(86)0755-83095458 FAX:(86)0755-88364052 Pin Configuration Pin Description

(Note 1) ESD Rating, Note 3 (Note 2) TA = 25°C; VCC = 3.3V for KB809 unless otherwise noted. Values in bold are for –40°C to +85°C; unless otherwise noted Symbol Parameter Condition Min Typ Max Units VCC Operating Voltage Range T A = 0°C to 70°C 0.95 8 V TA = –40°C to 85°C 0.95 8 V ICC Supply Current V CC = 3.3V 1 3 µA VTH Reset Voltage Threshold S Voltage Options (KB809-293) 2.85 2.93 3.00 V VHYST Typical hysteresis 5m V TRST Reset Timeout Period 180 ms TPROP Propogation delay /RESET < V OL, 100mV Overdrive 9.3 µs VOH /RESET Output Voltage High I SOURCE = 500µA 0.8·V CC V VOL /RESET Output Voltage Low V CC = VTH min., ISINK = 1.2mA 0.3 V VCC > 1.4V, ISINK = 50µA, TA = 0°C to +70°C 0.3 V VCC > 1.6V, ISINK = 50µA, TA = –40° to +85°C 0.3 V Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. VCC VTH RESET TRST TRST VTH Reset Timing Diagram KB809 Kingbor Technology Co.,Ltd TEL:(86)0755-83095458 FAX:(86)0755-88364052 300140 Absolute Maximum Ratings Operating Ratings

Electrical Characteristics

Reset Voltage Threshold S Voltage Options (KB809-263) 2.55 2.63 2.70 V

4 March 2007

-VTH VCC (3) RESET (2) GND (1) RESET GENERATOR KB809 Block Diagram KB809 Kingbor Technology Co.,Ltd TEL:(86)0755-83095458 FAX:(86)0755-88364052 Functional Diagram Standard Circuits

6 March 2007

/K30/K2E/K30/K37/K39 /K30/K2E/K30/K37/K31 /K30/K2E/K31/K32/K30 /K30/K2E/K31/K30/K35 /K30/K2E/K30/K34/K30 /K30/K2E/K30/K33/K31 /K30/K2E/K30/K30/K34 /K30/K2E/K30/K30/K31 /K30/K2E/K30/K32/K31 /K30/K2E/K30/K31/K35 /K30/K2E/K30/K35/K35 /K30/K2E/K30/K34/K37 /K30/K2E/K30/K39/K38 /K30/K2E/K30/K38/K33 /K30/K2E/K30/K30/K35/K39 /K30/K2E/K30/K30/K33/K35 /K30/K2E/K30/K31/K30 /K30/K2E/K30/K30/K35 /K30/K2D/K38/KBC 3-lead SOT-23 KB809 Kingbor Technology Co.,Ltd TEL:(86)0755-83095458 FAX:(86)0755-88364052 PACAGE DESCRIPTION Kingbor Technology TEL:(86) 0755-83095458 FAX: (86) 0755-88364052 www.kingbor.com