TS3809 TSC | Alldatasheet

Document overview

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Technical content

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 Vcc=+1V
  • Power supply transient immunity

Applications

  • Battery-operated systems and Controllers
  • Intelligent instruments
  • Critical uP and uC power m onitoring
  • Portable / Battery powered equipment
  • Automotive Typical Application Circuit Absolute Maximum Rating Parameter Symbol Maximum 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 VCC +0.3 V Input Current, VCC ICC 20 mA Output Current, RESET, (RESET) IO 5 mA Power Dissipation PD (TJ-TA)/θJA 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 Pin Definition: TS3809 TS3810 1. GND 1. GND 2. RESET 2. (RESET) 3. VCC 3. VCC

Microprocessor Reset Circuit 2/7 Version: C07 Thermal Performance Parameter Symbol Maximum Unit Thermal Resistance from Junction to Case θJC 110 ºC/W Thermal Resistance from Junction to ambient θJA 250 ºC/W Note: θJA is measured the PCB copper area of approximately 1in 2 (Multi-layer). Needs to connect to VSS pin. Electrical Specification (Ta = 25oC, unless otherwise specified.) Parameter Conditions Symbol Min Typ Max Unit Input Supply Voltage Ta=-40oC~+85oC VCC 1.0 -- 6 V Supply Current VCC=VTH +1V ICC -- 25 35 uA TS3809/3810CXA 4.54 4.63 4.71 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 Reset Threshold TS3809/3810CXG VTH 2.20 2.25 2.30 V Reset Threshold Temperature Coefficient TA=0~+85ºC VTHT -- 50 -- ppm/ oC Set-up Time VCC = 0 ~ (VTH - 100mV) TSET 1 -- -- µS VCC to Reset Delay VCC = VTH ~ (VTH - 100mV) TRD -- 20 -- µS Reset Active Timeout Period TA=0~+85ºC TDELAY 140 200 260 mS 1.8V<VCC<VTH(MAX), ISINK =1.2mA RESET Output (TS809) Voltage Low 1.2V<VCC<1.8V, ISINK =50µA VOL -- -- 0.3 V RESET Output (TS809) Voltage High VCC > VTH(MAX), ISOURCE =500µA VOH 0.8 VCC -- -- V (RESET) Output (TS810) Voltage Low VCC > VTH(MAX), ISINK =1.2mA VOL -- -- 0.3 V 1.8V<VCC<VTH(MAX), ISOURCE =500µA (RESET) Output (TS810) Voltage High 1.2V<VCC<1.8V, ISOURCE =150µA VOH 0.8 VCC -- -- V Hysteresis at Vcc Input Voltage VHVS -- 40 -- mV

Microprocessor Reset Circuit 3/7 Version: C07 Block Diagram Marking Information 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

Microprocessor Reset Circuit 4/7 Version: C07

Application Information

Negative-Going VCC 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 Vcc transients (glitches). The TS3809/3810 do not generate a reset pulse. The graph was generated using a negative going pulse applied to Vcc, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pu lse 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 b elow the reset threshold and lasts 20µS 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 (µP’s) reset input starts th e µP In a know state. The TS 3809/3810 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 TS 3809/3810 have a push-pull output stage. Ensuring a Valid Reset Output Down to Vcc=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 TS 3809/3810 reset output no longer sinks current - it becomes an open circuit. There fore, 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 TS 3809/3810 if reset is required to remain valid for Vcc<1V. Benefits of Highly Accurate Reset Threshold Most µP supervisor ICs has reset threshold voltages b e t w e e n 5 % a n d 1 0 % b e l o w t h e v a l u e o f n o m i n a l s u p p l y 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 zon e of uncertainty where the supply is between 5% and 10% low, and where the reset many or may not be asserted Timming Diagram

Microprocessor Reset Circuit 6/7 Version: C07 SOT-23 Mechanical Drawing SOT-23 DIMENSION MILLIMETERS INCHES DIM MIN MAX MIN MAX. A 0.95 BSC 0.037 BSC A1 1.9 BSC 0.074 BSC B 2.60 3.00 0.102 0.118 C 1.40 1.70 0.055 0.067 D 2.80 3.10 0.110 0.122 E 1.00 1.30 0.039 0.051 F 0.00 0.10 0.000 0.004 G 0.35 0.50 0.014 0.020 H 0.10 0.20 0.004 0.008 I 0.30 0.60 0.012 0.024 J 5º 10º 5º 10º

Microprocessor Reset Circuit 7/7 Version: C07 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 p rovide 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 disclai ms 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.