TS809 TSC | Alldatasheet

Document overview

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Technical content

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

Note: x is the threshold voltage type, option as A: 4 . 6 3 V B: 4 . 3 8 V C: 4.00V D: 3.08V E: 2.93V F: 2.63V Part No. Enable Function Package TS809CX x Active-Low TS810CX x Active-High TS809RCXx Active-Low TS810RCXx Active-High SOT-23

Applications

— C o m p u t e r s — Controllers — Intelligent instruments — Critical uP and uC power monitoring — Portable / Battery powered equipment — Automotive Pin Descriptions Name Description Gnd Ground RESET (RESET) Reset output pin L: for TS809 & TS811 H: for TS809R & TS811R Vcc Operating voltage input

TS809/810/809R/810R 2-6 2004/09 rev. D Absolute Maximum Rating Terminal Voltage (with respect to Gnd) V CC - 0.3 ~ +6.0 V RESET & (RESET) push-pull V RESET - 0.3 ~ (V CC +0.3) V Input Current, Vcc I CC 20 mA Output Current, RESET, (RESET) I O 20 mA Continuous Power Dissipation (Ta=+70 oC) de-rate 4mW/ oC above +70 oC PD 320 mW Operating Junction Temperature Range T OP -40 ~ +105 oC Storage Temperature Range T STG -65 ~ +150 oC Lead Soldering Temperature (260 oC) T LEAD 10 S Electrical Characteristics (Ta = 25 oC, unless otherwise specified.) Parameter Conditions Symbol Min Typ Max Unit Input Supply Voltage Ta = 0 oC ~ +70 oC V CC 1.0 -- 5.5 V VCC ≤ 5.5V -- 19 60 Supply Current VCC ≤ 3.6V ICC - 17 50 uA TS809/910/809R/810RCXA 4.56 4.63 4.7 TS809/910/809R/810RCXB 4.31 4.38 4.45 TS809/910/809R/810RCXC 3.94 4.00 4.06 TS809/910/809R/810RCXD 3.03 3.08 3.13 TS809/910/809R/810RCXE 2.89 2.93 2.97 Reset Threshold TS809/910/809R/810RCXF V TH 2.59 2.63 2.67 V Reset Threshold Temperature Coefficient V TH -- 30 -- ppm/ oC Vcc Rising Time to Function Ta = -20 oC ~ +105 oC 25 -- -- uS/V VCC to Reset Delay V CC = VTH to (VTH - 100mV) 20 100 uS Reset Active Timeout Period Ta = 0 oC ~ +70 oC TDELAY 100 240 600 mS VCC = VTH(MIN), ISINK =1.2mA, TS809 & TS809R -- -- 0.3 VCC = VTH(MIN), ISINK =3.2mA, -- -- 0.4 RESET Output Voltage Low VCC > 1.0V, ISINK =50uA VOL -- -- 0.3 V VCC > VTH(MAX), ISOURCE =500uA, TS809 & TS809R

0.8 VCC -- -- RESET Output Voltage High

VCC > VTH(MAX), ISOURCE =800uA, VOH VCC –1.5 -- -- V VCC = VTH(MAX), ISINK =1.2mA, TS810 & TS810R -- -- 0.3 RESET Output Voltage Low VCC = VTH(MAX), ISINK =3.2mA, VOL -- -- 0.4 V RESET Output Voltage High 1.8V < V CC < VT H ( M I N ) , ISOURCE =150uA, TS810 & TS810R VOH 0.8 V CC -- -- V

TS809/810/809R/810R 3-6 2004/09 rev. D 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, t he TS809/810/809R/810R are relatively immune to shor t-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, star ting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparat or 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 tr ansient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a Vcc transient that goes 100mV bel ow the reset threshold and lasts 20µS or less will not cause a reset pulse. A 0.1µF bypass capacitor mount ed as close as possible to the Vcc pin provides additional transient immunity. Applications Circuit 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 circuitr y 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 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 s upply ±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

TS809/810/809R/810R 5-6 2004/09 rev. D Function Block Marking Information Part No. Identification Code Part No. Identification Code Part No. Identification Code Part No. Identification Code TS809CXA EA TS810CXA E0 TS809RCXA EG TS810RCXA E7 TS809CXB EB TS810CXB E2 TS809RCXB EH TS810RCXB E8 TS809CXC EC TS810CXC E3 TS809RCXC EI TS810RCXC E9 TS809CXD ED TS810CXD E4 TS809RCXD EJ TS810RCXD EM TS809CXE EE TS810CXE E5 TS809RCXE EK TS810RCXE EN TS809CXF EF TS810CXF E6 TS809RCXF EL TS810RCXF EP

TS809/810/809R/810R 6-6 2004/09 rev. D SOT-23 Mechanical Drawing D C A E B G F SOT-23 DIMENSION MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.88 2.91 0.113 0.115 B 0.39 0.42 0.015 0.017 C 1.78 2.03 0.070 0.080 D 0.51 0.61 0.020 0.024 E 1.59 1.66 0.063 0.065 F 1.04 1.08 0.041 0.043 G 0.07 0.09 0.003 0.004