(STM706x / STM708x) 3V Supervisor

www.DataSheet4U.com STM706T/S/R, STM706P, STM708T/S/R 3V Supervisor FEATURES SUMMARY ■ ■ ■ ■ ■ ■ ■ ■ ■ PRECISION VCC MONITOR – STM706/708 T: 3.00V ≤ VRST ≤ 3.15V S: 2.88V ≤ VRST ≤ 3.00V R; STM706P: 2.59V ≤ VRST ≤ 2.70V RST AND RST OUTPUTS 200ms (TYP) trec WATCHDOG TIMER - 1.6sec (TYP) MANUAL RESET INPUT (MR) POWER-FAIL COMPARATOR (PFI/PFO) LOW SUPPLY CURRENT - 40µA (TYP) GUARANTEED RST (RST) ASSERTION DOWN TO VCC = 1.0V OPERATING TEMPERATURE: –40°C to 85°C (Industrial Grade) Figure 1. Packages 8 1 SO8 (M) TSSOP8 3x3 (DS) Table 1. Device Options Watchdog Input STM706T/S/R STM706P(2) STM708T/S/R ✔ ✔ Watchdog Output ✔ ✔ ✔ Active-Low RST(1) ✔ ✔ ✔ Active-High RST(1) Manual Reset Input ✔ ✔ ✔ Power-fail Comparator ✔ ✔ ✔ Note: 1. Push-Pull Output 2. The STM706P is identical to the STM706R, except its reset output is active-high. February 2005 1/26 STM706T/S/R; STM706P; STM708T/S/R TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Logic Diagram (STM706T/S/R and STM706P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 3. Logic Diagram (STM708T/S/R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Table 2. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 4. STM706T/S/R and STM706P SO8 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 5. STM706T/S/R and STM706P TSSOP8 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 6. STM708T/S/R SO8 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 7. STM708T/S/R TSSOP8 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 8. Block Diagram (STM706T/S/R and STM706P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 9. Block Diagram (STM708T/S/R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 10.Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Push-button Reset Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Watchdog Input (STM706T/S/R and STM706P). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Watchdog Output (STM706T/S/R and STM706P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Power-fail Input/Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Ensuring a Valid Reset Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 11.Reset Output Valid to Ground Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Interfacing to Microprocessors with Bi-directional Reset Pins . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 12.Interfacing to Microprocessors with Bi-directional Reset I/O . . . . . . . . . . . . . . . . . . . . . . 10 TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 13.Supply Current vs. Temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 14.VPFI Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 15.Reset Comparator Propagation Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 16.Power-up trec vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 17.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 18.Watchdog Time-out Period vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 19.PFI to PFO Propagation Delay vs. Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 20.Output Voltage vs. Load Current (VCC = 5V; VBAT = 2.8V; TA = 25°C). . . . . . . . . . . . . . 14 Figure 21.Output Voltage vs. Load Current (VCC = 0V; VBAT = 2.8V; TA = 25°C). . . . . . . . . . . . . . 14 Figure 22.RST Output Voltage vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 23.RST Output Voltage vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 24.Power-fail Comparator Response Time (Assertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 25.Power-fail Comparator Response Time (De-Assertion) . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/26 STM706T/S/R; STM706P; STM708T/S/R Figure 26.Maximum Transient Duration vs. Reset Threshold Overdrive. . . . . . . . . . . . . . . . . . . . . 17 MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 4. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 5. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 27.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 28.Power-fail Comparator Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 29.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 30.Watchdog Timing (STM706T/S/R and STM706P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 6. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 31.SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mechanical. . . . . . . 21 Table 7. SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mechanical Data . . 21 Figure 32.TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Outline . . . . . . . . . . . 22 Table 8. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Mechanical Data . . . . 22 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 9. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 10. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 11. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3/26 STM706T/S/R; STM706P; STM708T/S/R SUMMARY DESCRIPTION The STM70x Supervisors are self-contained devices which provide microprocessor supervisory functions. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition occurs, the reset output (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. Figure 2. Logic Diagram (STM706T/S/R and STM706P) VCC Table 2. Signal Names MR WDI WDO RST Push-button Reset Input Watchdog Input Watchdog Output Active-Low Reset Output Active-High Reset Output Supply Voltage Power-fail Input Power-fail Output Ground No Connect WDI MR PFI STM706T/S/R, STM706P WDO RST (RST)(1) PFO RST(1) VCC PFI PFO VSS AI08841 VSS NC Note: 1. For STM706P only. Note: 1. For STM706P and STM708T/S/R only. Figure 3. Logic Diagram (STM708T/S/R) VCC RST MR STM708T/S/R PFI PFO RST VSS AI08842 4/26 STM706T/S/R; STM706P; STM708T/S/R Figure 4. STM706T/S/R and STM706P SO8 Connections SO8 MR VCC VSS PFI 1 2 3 4 8 7 6 5 WDO RS