STM708T/S/R STMicroelectronics, STM708T/S/R Datasheet

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... STM706T/S/R, STM706P, STM708T/S/R Features ■ Precision V monitor CC – STM706/708 T: 3. 3.15 V RST S: 2. 3.00 V RST R: STM706P: 2.59 V ■ RST and RST outputs ■ 200 ms (typ.) t rec ■ Watchdog timer - 1.6 s (typ.) ■ Manual reset input (MR) ■ Power-fail comparator (PFI/PFO) ■ Low supply current - 40 µA (typ.) ■ ...

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... Power-fail input/output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.6 Ensuring a valid reset output down to V 3.7 Interfacing to microprocessors with bi-directional reset pins . . . . . . . . . . 13 4 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 2/32 STM706T/S/R, STM706P, STM708T/S Doc ID 10518 Rev 11 ...

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... STM706T/S/R, STM706P, STM708T/S/R List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 5. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 6. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 7. SO8 - 8-lead plastic small outline, 150 mils body width, package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Table 8. ...

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... Logic diagram (STM708T/S/ Figure 3. STM706T/S/R and STM706P SO8 connections Figure 4. STM706T/S/R and STM706P TSSOP8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 5. STM708T/S/R SO8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 6. STM708T/S/R TSSOP8 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 7. Block diagram (STM706T/S/R and STM706P Figure 8. Block diagram (STM708T/S/ Figure 9. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 10. Reset output valid to ground circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 11 ...

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... When an invalid V (RST) is forced low (or high in the case of RST). These devices also offer a watchdog timer (except for STM708T/S/R) as well as a power-fail comparator to provide the system with an early warning of impending power failure. The STM706P is identical to the STM706R, except its reset output is active-high. These devices are available in a standard 8-pin SOIC package or a space-saving 8-pin TSSOP package ...

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... CC PFI Power-fail input PFO Power-fail output V Ground connect 1. For STM706P and STM708T/S/R only. Figure 3. STM706T/S/R and STM706P SO8 connections 1. For STM706P reset output is active-high. Figure 4. STM706T/S/R and STM706P TSSOP8 connections 1. For STM706P reset output is active-high. 6/32 STM706T/S/R, STM706P, STM708T/S/R Name SO8 ...

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... STM706T/S/R, STM706P, STM708T/S/R Figure 5. STM708T/S/R SO8 connections Figure 6. STM708T/S/R TSSOP8 connections SO8 RST RST PFI 4 5 PFO TSSOP8 RST RST 2 7 PFO PFI Doc ID 10518 Rev 11 Description AI08839 AI08840 7/32 ...

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... Output type is push-pull. CC when triggered, and stays low whenever V when triggered, and stays high whenever V , PFO goes low; otherwise, PFO remains high. Connect to PFI Doc ID 10518 Rev 11 STM706T/S/R, STM706P, STM708T/S/R is below the reset CC after either V rises above the rec CC ...

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... STM706T/S/R, STM706P, STM708T/S/R 2.7 PFO When PFI is less than V push-pull. PFO pin is not supposed to be forced low by a processor. MR input is gated off during the period PFO is forced low. Leave open if unused. Table 3. Pin description Pin STM706P STM706T/S/R SO8 TSSOP8 SO8 ...

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... Pin descriptions Figure 8. Block diagram (STM708T/S/ PFI Figure 9. Hardware hookup Regulator Unregulated V IN voltage For STM706T/S/R and STM706P. 2. For STM706P and STM708T/S/R. 10/32 COMPARE V RST V COMPARE PFI STM706T/S/R; 0.1 F STM706P; STM708T/S/R WDI (1) WDO (1) From microprocessor PFI MR Push-button Doc ID 10518 Rev 11 ...

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... Reset output The STM70x supervisor asserts a reset signal to the MCU whenever V reset threshold (V push-button reset input (MR) is taken low. RST is guaranteed logic low (logic high for STM706P and STM708T/S/R) for V During power-up, once V the reset timeout period drops below the reset threshold, RST goes low. Each time RST is asserted, it stays ...

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... A resistor value of approximately 100 k will be large enough to not load the output under operating conditions, but still sufficient to pull RST to ground during this low voltage condition (see Figure 10. Reset output valid to ground circuit 12/32 STM706T/S/R, STM706P, STM708T/S/R input to the STM70x or the micro STM70x ...

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... STM706T/S/R, STM706P, STM708T/S/R 3.7 Interfacing to microprocessors with bi-directional reset pins Microprocessors with bi-directional reset pins can contend with the STM70x reset output. For example, if the reset output is driven high and the micro wants to pull it low, signal contention will result. To prevent this from occurring, connect a 4.7k resistor between the reset output and the micro's reset I Figure 11 ...

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... Typical operating characteristics 4 Typical operating characteristics Typical values are at T Figure 12. Supply current vs. temperature (no load –40 –20 14/ ° Temperature (°C) Doc ID 10518 Rev 11 STM706T/S/R, STM706P, STM708T 100 120 AI09141b ...

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... STM706T/S/R, STM706P, STM708T/S/R Figure 13. V threshold vs. temperature PFI 1.270 1.265 2.5 V 1.260 3 3.3 V 1.255 3.6 V 1.250 1.245 1.240 1.235 1.230 1.225 –40 –20 Figure 14. Reset comparator propagation delay vs. temperature –40 – Temperature (°C) ...

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... Figure 16. Normalized reset threshold vs. temperature 1.004 1.002 1.000 0.998 0.996 –40 –20 16/32 STM706T/S/R, STM706P, STM708T/S Temperature (° Temperature (°C) Doc ID 10518 Rev 3 4 5.5 V 100 120 AI09144b ...

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... STM706T/S/R, STM706P, STM708T/S/R Figure 17. Watchdog timeout period vs. temperature 1.90 1.85 1.80 1.75 1.70 1.65 1.60 –40 –20 Figure 18. PFI to PFO propagation delay vs. temperature 4.0 3.0 2.0 1.0 0.0 –40 – Temperature (˚ Temperature (˚C) Doc ID 10518 Rev 11 Typical operating characteristics 100 120 AI09146b 3 ...

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... Typical operating characteristics Figure 19. Output voltage vs. load current (V 5.00 4.98 4.96 4. Figure 20. RST output voltage vs. supply voltage 18/32 STM706T/S/R, STM706P, STM708T/S ° OUT (mA) V RST V CC 500 ms / div Doc ID 10518 Rev AI10496 ( ...

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... STM706T/S/R, STM706P, STM708T/S/R Figure 21. RST output voltage vs. supply voltage Figure 22. Power-fail comparator response time (assertion PFO 1.3 V PFI Typical operating characteristics V RST V CC 500 ms / div 500 ns / div Doc ID 10518 Rev ( AI09150b div ...

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... Figure 24. Maximum transient duration vs. reset threshold overdrive 6000 5000 4000 3000 2000 1000 20/32 500 ns / div Reset occurs above the curve Reset comparator overdrive, V RST – (V) Doc ID 10518 Rev 11 STM706T/S/R, STM706P, STM708T/S div 1.3 V 500 mV / div AI09154b AI09156b ...

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... STM706T/S/R, STM706P, STM708T/S/R 5 Maximum ratings Stressing the device above the rating listed in the cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...

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... Input pulse voltages Input and output timing ref. voltages Figure 25. AC testing input/output waveforms Figure 26. Power-fail comparator waveform RST PFO RST 22 Doc ID 10518 Rev 11 STM706T/S/R, STM706P, STM708T/S/R STM70x 1.0 to 5.5 – 0 0 rec Unit V ° ...

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... STM706T/S/R, STM706P, STM708T/S/R Figure 27. MR timing waveform MR t MLRL (1) RST 1. RST for STM706P and STM708T/S/R. Figure 28. Watchdog timing (STM706T/S/R and STM706P RST WDI WDO t rec t MLMH t rec Doc ID 10518 Rev 11 DC and AC parameters AI07837a t WD AI08833 23/32 ...

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... Output low voltage (RST) OL Output high voltage (RST RST, WDO) Output high voltage (PFO) Power-fail comparator V PFI input threshold PFI PFI to PFO propagation t PFD delay 24/32 STM706T/S/R, STM706P, STM708T/S/R (1) Test condition V < 3 < 5 < V < < V < (max.) < ...

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... STM706T/S/R, STM706P, STM708T/S/R Table 6. DC and AC characteristics (continued) Symbol Description Reset thresholds (3) V Reset threshold RST Reset threshold hysteresis t RST pulse width rec Push-button reset input t MLMH MR pulse width ( MLRL MR to RST output delay ( MRD Watchdog timer (STM706T/S/R and STM706P) ...

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... Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. 26/32 STM706T/S/R, STM706P, STM708T/S/R Doc ID 10518 Rev 11 ® ...

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... STM706T/S/R, STM706P, STM708T/S/R Figure 29. SO8 – 8-lead plastic small outline, 150 mils body width, package mechanical A2 B Note: Drawing is not to scale. Table 7. SO8 - 8-lead plastic small outline, 150 mils body width, package mechanical data Symbol ddd ...

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... Doc ID 10518 Rev 11 STM706T/S/R, STM706P, STM708T/S inches Typ. Min. — — — 0.002 0.034 0.030 — 0.010 — 0.005 — — 0.118 0.114 0.026 — 0.193 0.183 0.118 0.114 0.022 ...

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... STM706T/S/R, STM706P, STM708T/S/R 8 Part numbering Table 9. Ordering information scheme Example: Device type STM706 STM708 Reset threshold voltage T: 3. RST S: 2. RST R, STM706P: 2. RST pulse width Blank = 140 to 280 ms ( 160 to 280 ms Package M = SO8 ( TSSOP8 Temperature range 6 = – °C Shipping method ® ...

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... Part numbering Table 10. Marking description Part number STM706P STM706T STM706S STM706R STM708T STM708S STM708R 30/32 STM706T/S/R, STM706P, STM708T/S/R Reset threshold Package SO8 2.63 V TSSOP8 SO8 3.08 V TSSOP8 SO8 2.93 V TSSOP8 SO8 2.63 V TSSOP8 SO8 3.08 V TSSOP8 SO8 2.93 V TSSOP8 SO8 2.63 V TSSOP8 Doc ID 10518 Rev 11 Topside marking 706P 706T ...

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... STM706T/S/R, STM706P, STM708T/S/R 9 Revision history Table 11. Document revision history Date Revision Oct-2003 12-Dec-2003 16-Jan-2004 09-Apr-2004 25-May-2004 02-Jul-2004 21-Sep-2004 25-Feb-2005 02-Nov-2009 30-Apr-2010 06-Aug-2010 06-Sep-2011 1 Initial release. Reformatted; update characteristics 2 Table 6 to 9). 2.1 Add Typical operating characteristics (Figure 3 Reformatted; update characteristics 4 Update characteristics (Table 5 Datasheet promoted ...

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... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 32/32 STM706T/S/R, STM706P, STM708T/S/R Please Read Carefully: © 2011 STMicroelectronics - All rights reserved STMicroelectronics group of companies www ...