TS3809_15 TSC | Alldatasheet

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Document Number: DS_P0000206 1 Version: E15 Microprocessor Reset Circuit GENERAL DESCRIPTION The TS3809/3810 series are used for microprocessor (µP) supervisory circuits to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V, +2.5V powered circuits. These circuits perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold, keeping it asserted for at least 200ms after V CC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. TS3809/3810 series have push pull outputs. TS3809 series has an active low RESET output, while the TS3810 has an active high RESET output The reset comparator is designed to ignore fast transients on V CC , and the outputs are guaranteed to be in the correct logic state for V CC down to 1.0V. Low supply current makes TS3809/3810 series ideal for use in portable equipment.

FEATURES

  • High Accurate ±2%
  • Precision monitoring of +3V, +3.3V, and +5V Power supply voltage
  • Fully specified over temperature
  • Available in three output configurations
  • Push-Pull RESET low output (TS3809)
  • Push-Pull (RESET) high output (TS3810)
  • 200ms typ. Power-on reset pulse width
  • 25µs supply current
  • Guaranteed reset valid to V CC =+1V
  • Power supply transient immunity APPLICATION
  • Battery-operated systems and controllers
  • Intelligent instruments
  • Critical µP and µC power monitoring
  • Portable / Battery powered equipment
  • Automotive SOT -23 Pin Definition TS3809 1. GND 2. RESET 3. VCC TS3810 1. GND 2. (RESET) 3. VCC TYPICAL APPLICATIN CIRCUIT

Document Number: DS_P0000206 2 Version: E15 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL LIMIT UNIT Terminal Voltage (with respect to GND) VCC GND - 0.3 to GND +6.5 V RESET & (RESET) push-pull VRESET GND - 0.3 to V CC +0.3 V Input Current, V CC ICC 20 mA Output Current, RESET, (RESET) IO 5 mA Power Dissipation PD (T J-TA)/RθJA mW Operating Junction Temperature Range TJ.OPR -40 ~ +125 oC Storage Temperature Range TSTG -65 ~ +150 oC Lead Soldering Temperature (260 oC) TLEAD 10 s THERMAL PERFORMANCE PARAMETER SYMBOL MAXIMUM UNIT Thermal Resistance from Junction to Case R θJC 110 ºC/W Thermal Resistance from Junction to Ambient (Note 1) R θJA 250 ºC/W ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°C unless otherwise noted) PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNIT Input Supply Voltage TA=-40oC~+85 oC V CC 1.0 -- 6 V Supply Current VCC =V TH + 1V I CC -- 25 35 µA Reset Threshold TS3809/3810CXA VTH 4.54 4.63 4.71 V TS3809/3810CXB 4.29 4.38 4.46 TS3809/3810CXC 3.92 4.00 4.08 TS3809/3810CXD 3.02 3.08 3.15 TS3809/3810CXE 2.87 2.93 3.00 TS3809/3810CXF 2.57 2.63 2.69 TS3809/3810CXG 2.20 2.25 2.30 Reset Threshold Temperature Coefficient T A=0~+85ºC V THT -- 50 -- ppm/ oC Set-up Time V CC = 0 ~ (VTH - 100mV) T SET 1 -- -- µs VCC to Reset Delay V CC = VTH ~ (VTH - 100mV) T RD -- 20 -- µs Reset Active Timeout Period TA=0~+85ºC T DELAY 140 200 260 ms RESET Output (TS3809) Voltage Low 1.8V<VCC <V TH(MAX) , ISINK =1.2mA VOL -- -- 0.3 V 1.2V<VCC <1.8V, ISINK =50µA RESET Output (TS3809) Voltage High VCC > V TH(MAX) , ISOURCE =500µA VOH 0.8 V CC -- -- V (RESET) Output (TS3810) Voltage Low VCC > VTH(MAX) , I SINK =1.2mA VOL -- -- 0.3 V

Document Number: DS_P0000206 3 Version: E15 ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°C unless otherwise noted) PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNIT (RESET) Output (TS3810) Voltage High 1.8V<V CC <V TH(MAX) , ISOURCE =500µA VOH 0.8 V CC -- -- V 1.2V<VCC <1.8V, ISOURCE =150µA Hysteresis at V CC Input Voltage VHVS -- 40 -- mV Note : 1. R θJA is measured the PCB copper area of approximately 1in2 (Multi-layer). Needs to connect to V SS pin.

Document Number: DS_P0000206 4 Version: E15

ORDERING INFORMATION

RESET VOLTAGE PART NO. PACKAGE PACKING 4.63V TS3809CXA RFG SOT-23 3,000pcs / 7” Reel 4.38V TS3809CXB RFG SOT-23 3,000pcs / 7” Reel 4.00V TS3809CXC RFG SOT-23 3,000pcs / 7” Reel 3.08V TS3809CXD RFG SOT-23 3,000pcs / 7” Reel 2.93V TS3809CXE RFG SOT-23 3,000pcs / 7” Reel 2.63V TS3809CXF RFG SOT-23 3,000pcs / 7” Reel 2.25V TS3809CXG RFG SOT-23 3,000pcs / 7” Reel 4.63V TS3810CXA RFG SOT-23 3,000pcs / 7” Reel 4.38V TS3810CXB RFG SOT-23 3,000pcs / 7” Reel 4.00V TS3810CXC RFG SOT-23 3,000pcs / 7” Reel 3.08V TS3810CXD RFG SOT-23 3,000pcs / 7” Reel 2.93V TS3810CXE RFG SOT-23 3,000pcs / 7” Reel 2.63V TS3810CXF RFG SOT-23 3,000pcs / 7” Reel 2.25V TS3810CXG RFG SOT-23 3,000pcs / 7” Reel Note: 1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC. 2. Halogen-free according to IEC 61249-2-21 definition. BLOCK DIAGRAM

Document Number: DS_P0000206 6 Version: E15

APPLICATION INFORMATION

Negative-Going V CC transients in addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the TS3809/3810 are relatively immune to short-duration negative-going V CC transients (glitches). The TS3809/3810 does not generate a reset pulse. The graph was generated using a negative going pulse applied to V CC , starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV 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. FUNCTION DESCRIPTION A microprocessor’s reset input starts the µP in a known state. The TS3809/3810 assert reset to prevent code- execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The TS3809/3810 have a push-pull output stage. ENSURING A VALID RESET OUTPUT DOWN TO V CC =0 RESET is guaranteed to be a logic low for VCC > 1.0V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC dips below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer starts after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. When VCC falls below 1V, the TS3809/3810 reset output no longer sinks current - it becomes an open circuit. Therefore, high impedance CMOS logic input connected to reset can drift to undetermined voltages. This present no problem in most applications since most µP and other circuitry is inoperative with VCC below 1V.However, in applications where reset must be valid down to 0V, adding a pull down resistor to reset causes and stray leakage currents to flow to ground, holding reset low (Figure 2.) R1’s value is not critical; 100K is large enough not to load reset and small enough to pull RESET to ground. For the TS3809/3810 if reset is required to remain valid for VCC <1V. BENEFITS OF HIGHLY ACCURATE RESET THRESHOLD Most µP supervisor ICs has reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset many or may not be asserted. TIMMING DIAGRAM

Document Number: DS_P0000206 7 Version: E15 PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) SOT-23 SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM PART NO. IDENTIFICATION CODE PART NO. IDENTIFICATION CODE TS3809CXA CA TS3810CXA CH TS3809CXB CB TS3810CXB CI TS3809CXC CC TS3810CXC CJ TS3809CXD CD TS3810CXD CK TS3809CXE CE TS3810CXE CL TS3809CXF CF TS3810CXF CM TS3809CXG CG TS3810CXG CN

Document Number: DS_P0000206 8 Version: E15 Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale.