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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 (P) supervisory circuit used to monitor the power supplies in P 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
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
Ordering Information
Part No. Package Packing
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
Applications
Battery-operated systems Controllers Intelligent instruments Critical uP and uC power monitoring Portable / Battery powered equipment Automotive
Application Circuit
Pin Descriptions
Name
Gnd RESET (RESET) Vcc
Description
Ground RESET - TS809 / TS809R (Active Low) (RESET) - TS810 / TS810R (Active High) Operating voltage input
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Version: A07
TS809/810/809R/810R Series
Microprocessor Reset Circuit
Absolute Maximum Rating
Parameter
Terminal Voltage (with respect to Gnd) RESET & (RESET) push-pull Input Current, VCC Output Current, RESET, (RESET) Rate of Rise, VCC Continuous Power Dissipation Operating Junction Temperature Range Storage Temperature Range Lead Soldering Temperature (260 C)
o
Symbol
VCC VRESET ICC IO VR PD TOPR TSTG TLEAD
Maximum
7 - 0.3 ~ (VCC +0.3) 20 20 100 320 -40 ~ +125 -65 ~ +150 10
Unit
V V mA mA V/uS mW
o o
C C
S
Electrical Specifications (Ta = 25oC, unless otherwise noted)
Parameter
Input Supply Voltage Supply Current
o
Conditions
Ta=-40 C~+85 C VIN=VIN *1.10 VIN=VIN *1.10, Ta=-40 C~+85 C TS809/809R/810/810RCXA TS809/809R/810/810RCXB TS809/809R/810/810RCXC TS809/809R/810/810RCXD
o o o
Symbol
VCC ICC
Min
1.0 -4.56 4.31 3.94 3.03
Typ
---4.63 4.38 4.00 3.08 2.93 2.63 2.32 2.1 2.0 50 40 210 --
Max
5.5 3.0 5.0 4.7 4.45 4.06 3.13 2.97 2.67 2.35 2.13 2.03 160 -500 0.2
Unit
V uA
Reset Threshold
TS809/809R/810/810RCXE TS809/809R/810/810RCXF TS809/809R/810/810RCXG TS809CXH TS809CXI
VTH
2.89 2.59 2.28 2.07 1.97 30
V
Reset Threshold Temperature Coefficient VCC to Reset Delay Reset Active Timeout Period RESET Output (TS809/R) Voltage Low RESET Output (TS809/R) Voltage High (RESET) Output (TS810/R) Voltage Low (RESET) Output (TS810/R) Voltage High VCC = VTH - 100mV o o Ta=-40 C~+85 C VCC < VTH(MAX), ISINK =1.2mA VCC > VTH(MAX), ISOURCE =0.5mA, VCC > 1.8V VCC > VTH(MAX), ISOURCE =0.15mA, 1.8V VCC >1.0V VCC > VTH(MAX), ISINK =1.2mA VCC < VTH(MAX), ISOURCE =0.5mA, VCC > 1.8V VCC > VTH(MAX), ISOURCE =0.15mA, 1.8V VCC >1.0V TDELAY VOL
ppm/ o C uS mS V
-140 --
VOH
0.8 VCC
--
--
V
VOL
--
--
0.2
V
VOH
0.8 VCC
--
--
V
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Version: A07
TS809/810/809R/810R Series
Microprocessor Reset Circuit
Application Note
Function Description
A microprocessor's (P's) reset input starts the P 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 P 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 20S or less will not cause a reset pulse. A 0.1F 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 P 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 P 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
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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
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Version: A07
TS809/810/809R/810R Series
Microprocessor Reset Circuit
Function Block
Marking Information
Part No. TS809CXA TS809CXB TS809CXC TS809CXD TS809CXE TS809CXF TS809CXG TS809CXH TS809CXI
Identification Code ARK ARN ASB ASA AMO AMP ATT ASK BDT
Part No. TS810CXA TS810CXB TS810CXC TS810CXD TS810CXE TS810CXF TS810CXG ---
Identification Code ARJ ALS AAC ASU ALV AZM AAG ---
Part No. TS809RCXA TS809RCXB TS809RCXC TS809RCXD TS809RCXE TS809RCXF TS809RCXG ---
Identification Code ABA ABB ATQ ATO AUV ABF ABG ---
Part No. TS810RCXA TS810RCXB TS810RCXC TS810RCXD TS810RCXE TS810RCXF TS810RCXG ---
Identification Code ACA ACB ACC ACD ACE ACF ACG ---
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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
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 5 10 5 10
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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.
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Version: A07

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