TS809/810/809R/810R Series Microprocessor Reset Circuit SOT-23 Pin Definition: TS809/TS810 1. Ground 2. RESET(RESET) 3. Vcc TS809R/TS810R 1. RESET(RESET) 2. Ground 3. Vcc General Description The TS809/810 series are microprocessor (µP) supervisory circuit used 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 powered circuits. These circuits perform a single function: 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. Reset thresholds suitable for operation with a variety of supply voltages are available. The TS809/810 series have push pull outputs. The TS809/809R have an active low RESET output, while the TS810/810R has an active high (RESET) output. The reset comparator is designed to ignore fast transients on VCC, and the output guaranteed to be in the correct logic state for VCC down to 1V. Low supply correct makes the TS809/810 series ideal for use in portable equipment. Features ● ● ● ● ● ● ● ● ● ● ● Ordering Information Highly 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 (TS809/TS809R) Push-Pull (RESET) high output (TS810/TS810R) 140mS min. power-on reset pulse width 12uA supply current Guaranteed reset valid to Vcc = +1V Power supply transient immunity No external components Part No. Packing Application Circuit Applications ● ● ● ● ● ● Package TS809CXx RF SOT-23 3Kpcs / 7” Reel 3Kpcs / 7” Reel TS810CXx RF SOT-23 3Kpcs / 7” Reel TS809RCXx RF SOT-23 3Kpcs / 7” Reel TS810RCXx RF SOT-23 Note: x is the threshold voltage type, option as A : 4.63V B : 4.38V C : 4.00V D : 3.08V E : 2.93V F : 2.63V G : 2.32V H : 2.1V I : 2.0V Battery-operated systems Controllers Intelligent instruments Critical uP and uC power monitoring Portable / Battery powered equipment Automotive Pin Descriptions Name Description Gnd RESET (RESET) Vcc Ground RESET – TS809 / TS809R (Active Low) (RESET) – TS810 / TS810R (Active High) Operating voltage input 1/7 Version: A07 TS809/810/809R/810R Series Microprocessor Reset Circuit Absolute Maximum Rating Parameter Symbol Maximum Unit VCC 7 V VRESET - 0.3 ~ (VCC +0.3) V Input Current, VCC ICC 20 mA Output Current, RESET, (RESET) IO 20 mA Rate of Rise, VCC VR 100 V/uS Continuous Power Dissipation PD 320 mW TOPR -40 ~ +125 o TSTG -65 ~ +150 o TLEAD 10 Terminal Voltage (with respect to Gnd) RESET & (RESET) push-pull Operating Junction Temperature Range Storage Temperature Range o Lead Soldering Temperature (260 C) C C S Electrical Specifications (Ta = 25oC, unless otherwise noted) Parameter Input Supply Voltage Supply Current Conditions Symbol Min Typ Max Unit VCC 1.0 -- --- 5.5 3.0 V 4.56 4.31 -4.63 4.38 5.0 4.7 4.45 3.94 3.03 4.00 3.08 4.06 3.13 2.89 2.59 2.93 2.63 2.97 2.67 TS809/809R/810/810RCXG TS809CXH 2.28 2.07 2.32 2.1 2.35 2.13 TS809CXI 1.97 2.0 2.03 30 50 160 ppm/ o C TDELAY -140 40 210 -500 uS mS o o Ta=-40 C~+85 C VIN=VIN *1.10 o o VIN=VIN *1.10, Ta=-40 C~+85 C TS809/809R/810/810RCXA TS809/809R/810/810RCXB ICC TS809/809R/810/810RCXC TS809/809R/810/810RCXD Reset Threshold TS809/809R/810/810RCXE TS809/809R/810/810RCXF VTH Reset Threshold Temperature Coefficient uA V VCC to Reset Delay Reset Active Timeout Period VCC = VTH - 100mV o o Ta=-40 C~+85 C RESET Output (TS809/R) Voltage Low VCC < VTH(MAX), ISINK =1.2mA VOL -- -- 0.2 V RESET Output (TS809/R) Voltage High VCC > VTH(MAX), ISOURCE =0.5mA, VCC > 1.8V VCC > VTH(MAX), ISOURCE =0.15mA, 1.8V ≥ VCC >1.0V VOH 0.8 VCC -- -- V (RESET) Output (TS810/R) Voltage Low VCC > VTH(MAX), ISINK =1.2mA VOL -- -- 0.2 V VOH 0.8 VCC -- -- V (RESET) Output (TS810/R) Voltage High VCC < VTH(MAX), ISOURCE =0.5mA, VCC > 1.8V VCC > VTH(MAX), ISOURCE =0.15mA, 1.8V ≥ VCC >1.0V 2/7 Version: A07 TS809/810/809R/810R Series Microprocessor Reset Circuit Application Note Function Description A microprocessor’s (µP’s) reset input starts the µP In a know state. The TS809/810/809R/810R 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 TS809/810/809R/810R have a push-pull output stage. Applications Information Negative-Going VCC transients in addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the TS809/810 are relatively immune to short-duration negative-going Vcc transients (glitches). The TS809/810/809R/810R 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 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 20µS or less will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the Vcc pin provides additional transient immunity. Ensuring a Valid Reset Output Down to Vcc=0 When Vcc falls below 1V, the TS809/810/809R/810R 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 TS809/810/809R/810R 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 3/7 Version: A07 TS809/810/809R/810R Series Microprocessor Reset Circuit Electrical Characteristics Curve Figure 1. Reset Time vs. Temperature Figure 2. Threshold vs. Temperature Figure 3. IIN vs. Temperature Figure 4. Reset Time vs. Temperature Figure 5. IIN vs. VIN Figure 6. Reset Voltage vs. Temperature 4/7 Version: A07 TS809/810/809R/810R Series Microprocessor Reset Circuit Function Block Marking Information Part No. Identification Code Part No. Identification Part No. Code Identification Code Part No. Identification Code TS809CXA ARK TS810CXA ARJ TS809RCXA ABA TS810RCXA ACA TS809CXB ARN TS810CXB ALS TS809RCXB ABB TS810RCXB ACB TS809CXC ASB TS810CXC AAC TS809RCXC ATQ TS810RCXC ACC TS809CXD ASA TS810CXD ASU TS809RCXD ATO TS810RCXD ACD TS809CXE AMO TS810CXE ALV TS809RCXE AUV TS810RCXE ACE TS809CXF AMP TS810CXF AZM TS809RCXF ABF TS810RCXF ACF TS809CXG ATT TS810CXG AAG TS809RCXG ABG TS810RCXG ACG TS809CXH ASK -- -- -- -- -- -- TS809CXI BDT -- -- -- -- -- -- 5/7 Version: A07 TS809/810/809R/810R Series Microprocessor Reset Circuit SOT-23 Mechanical Drawing DIM A A1 B C D E F G H I J 6/7 SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 0.95 BSC 0.037 BSC 1.9 BSC 0.074 BSC 2.40 3.00 0.094 0.118 1.40 1.80 0.055 0.070 2.70 3.10 0.106 0.122 1.00 1.40 0.039 0.055 0.00 0.15 0.000 0.059 0.35 0.50 0.014 0.020 0.09 0.25 0.003 0.009 0.35 BSC 0.0138 BSC 5º 10º 5º 10º Version: A07 TS809/810/809R/810R Series Microprocessor Reset Circuit 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. 7/7 Version: A07