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TS809/ 810/ 809R/ 810R
Microprocessor Reset Circuit
Pin assignment: TS809/810 1. Gnd 2. RESET (RESET) 3. Vcc Pin assignment: TS809R/810R 1. RESET (RESET) 2. Gnd 3. Vcc
Threshold Voltage Option From 2.63V ~ 4.63V
General Description
The TS809/810/809R/810R 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 240ms(typ) after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The TS809/810/809R/810R 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 TS809/810/809R/810R ideal for use in portable equipment. The TS809/810/809R/810R is available in a 3-pin SOT-23 package.
Features
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.
TS809CX x TS810CX x TS809RCXx TS810RCXx
Enable Function
Active-Low Active-High Active-Low Active-High
Package
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
Applications
Computers Controllers Intelligent instruments Critical uP and uC power monitoring Portable / Battery powered equipment Automotive
Pin Descriptions
Name
Gnd Ground Reset output pin RESET (RESET) Vcc L: for TS809 & TS811 H: for TS809R & TS811R Operating voltage input
Description
TS809/810/809R/810R
1-6
2004/09 rev. D
Absolute Maximum Rating
Terminal Voltage (with respect to Gnd) RESET & (RESET) push-pull Input Current, Vcc Output Current, RESET, (RESET) Continuous Power Dissipation (Ta=+70 C) de-rate 4mW/ C above +70 C Operating Junction Temperature Range Storage Temperature Range Lead Soldering Temperature (260 C)
o o o o
VCC VRESET ICC IO PD
- 0.3 ~ +6.0 - 0.3 ~ (VCC +0.3) 20 20 320
V V mA mA mW
o o
TOP TSTG TLEAD
-40 ~ +105 -65 ~ +150 10
C C
S
Electrical Characteristics (Ta = 25 oC, unless otherwise specified.)
Parameter
Input Supply Voltage Supply Current
o
Conditions
Ta = 0 C ~ +70 C VCC 5.5V VCC 3.6V TS809/910/809R/810RCXA TS809/910/809R/810RCXB
o
Symbol
VCC ICC
Min
1.0 -4.56 4.31
Typ
-19 17 4.63 4.38 4.00 3.08 2.93 2.63 30 -20
Max
5.5 60 50 4.7 4.45 4.06 3.13 2.97 2.67 --100 600 0.3
Unit
V uA
Reset Threshold
TS809/910/809R/810RCXC TS809/910/809R/810RCXD TS809/910/809R/810RCXE TS809/910/809R/810RCXF
VTH
3.94 3.03 2.89 2.59
V
Reset Threshold Temperature Coefficient Vcc Rising Time to Function VCC to Reset Delay Reset Active Timeout Period Ta = -20 C ~ +105 C VCC = VTH to (VTH - 100mV) Ta = 0 C ~ +70 C VCC = VTH(MIN), ISINK =1.2mA, RESET Output Voltage Low TS809 & TS809R VCC = VTH(MIN), ISINK =3.2mA, VCC > 1.0V, ISINK =50uA RESET Output Voltage High VCC > VTH(MAX), ISOURCE =500uA, TS809 & TS809R VCC > VTH(MAX), ISOURCE =800uA, RESET Output Voltage Low VCC = VTH(MAX), ISINK =1.2mA, TS810 & TS810R VCC = VTH(MAX), ISINK =3.2mA, RESET Output Voltage High 1.8V < VCC < VTH(MIN), ISOURCE =150uA, TS810 & TS810R
o o o o
VTH
-25
ppm/
o
C
uS/V uS mS
TDELAY 100 -VOL --0.8 VCC VOH VCC -1.5 -VOL -VOH 0.8 VCC
240 --
V ---0.4 0.3 -V ---0.3 V --0.4 -V
TS809/810/809R/810R
2-6
2004/09 rev. D
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.
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.
Applications Information
Negative-Going VCC transients in addition to issuing a reset to the P during power-up, power-down, and brownout conditions, the TS809/810/809R/810R 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.
Benefits of Highly Accurate Reset Threshold
Most P supervisor ICs have 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.
Timing Diagram
Applications Circuit
TS809/810/809R/810R
3-6
2004/09 rev. D
Electrical Characteristics Curve
Figure 1. Iq v.s. Temperature Figure 2. Threshold v.s. Temperature
Figure 3. Immunity
TS809/810/809R/810R
4-6
2004/09 rev. D
Function Block
Marking Information
Part No. TS809CXA TS809CXB TS809CXC TS809CXD TS809CXE TS809CXF
Identification Code EA EB EC ED EE EF
Part No. TS810CXA TS810CXB TS810CXC TS810CXD TS810CXE TS810CXF
Identification Code E0 E2 E3 E4 E5 E6
Part No. TS809RCXA TS809RCXB TS809RCXC TS809RCXD TS809RCXE TS809RCXF
Identification Code EG EH EI EJ EK EL
Part No. TS810RCXA TS810RCXB TS810RCXC TS810RCXD TS810RCXE TS810RCXF
Identification Code E7 E8 E9 EM EN EP
TS809/810/809R/810R
5-6
2004/09 rev. D
SOT-23 Mechanical Drawing
A B
F
DIM A B C D E SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 2.88 2.91 0.113 0.115 0.39 0.42 0.015 0.017 1.78 2.03 0.070 0.080 0.51 0.61 0.020 0.024 1.59 1.66 0.063 0.065 1.04 0.07 1.08 0.09 0.041 0.003 0.043 0.004
E
G
F G
D
C
TS809/810/809R/810R
6-6
2004/09 rev. D

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