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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 - 40A (TYP) GUARANTEED RST (RST) ASSERTION DOWN TO VCC = 1.0V OPERATING TEMPERATURE: -40C to 85C (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
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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 = 25C). . . . . . . . . . . . . . 14 Figure 21.Output Voltage vs. Load Current (VCC = 0V; VBAT = 2.8V; TA = 25C). . . . . . . . . . . . . . 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
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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
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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
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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 RST(RST)(1) WDI PFO
AI08837
Figure 6. STM708T/S/R SO8 Connections
SO8 MR VCC VSS PFI 1 2 3 4 8 7 6 5 RST RST NC PFO
AI08839
Note: 1. For STM706P reset output is active-high.
Figure 5. STM706T/S/R and STM706P TSSOP8 Connections
TSSOP8 RST(RST)
(1)
Figure 7. STM708T/S/R TSSOP8 Connections
TSSOP8
WDO MR VCC
1 2 3 4
8 7 6 5
WDI PFO PFI VSS
AI08838
RST RST MR VCC
1 2 3 4
8 7 6 5
NC PFO PFI VSS
AI08840
Note: 1. For STM706P reset output is active-high.
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STM706T/S/R; STM706P; STM708T/S/R
Pin Descriptions MR. A logic low on MR asserts the reset output. Reset remains asserted as long as MR is low and for trec after MR returns high. This active-low input has an internal pull-up. It can be driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if unused. WDI. If WDI remains high or low for 1.6sec, the internal watchdog timer runs out and reset (or WDO) is triggered. The internal watchdog timer clears while reset is asserted or when WDI sees a rising or falling edge. The watchdog function cannot be disabled by allowing the WDI pin to float. WDO. WDO goes low when a transition does not occur on WDI within 1.6sec, and remains low until a transition occurs on WDI (indicating the watchdog interrupt has been serviced). WDO also goes low when VCC falls below the reset threshold; however, unlike the reset output, WDO goes high as soon as VCC exceeds the reset threshold. Note: For those devices with a WDO output, a watchdog timeout will not trigger reset unless WDO is connected to MR. Table 3. Pin Description
Pin STM706P STM706T/S/R STM708T/S/R Name Function
RST. Pulses low for trec when triggered, and stays low whenever VCC is below the reset threshold or when MR is a logic low. It remains low for trec after either VCC rises above the reset threshold, the watchdog triggers a reset, or MR goes from low to high. RST. Pulses high for trec when triggered, and stays high whenever VCC is above the reset threshold or when MR is a logic high. It remains high for trec after either VCC falls below the reset threshold, the watchdog triggers a reset, or MR goes from high to low. PFI. When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Connect to ground if unused. PFO. When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Leave open if unused.
SO8 TSSOP8 SO8 TSSOP8 SO8 TSSOP8 1 6 8 - 7 2 4 5 3 - 3 8 2 - 1 4 6 7 5 - 1 6 8 7 - 2 4 5 3 - 3 8 2 1 - 4 6 7 5 - 1 - - 7 8 2 4 5 3 6 3 - - 1 2 4 6 7 5 8 MR WDI WDO RST RST VCC PFI PFO VSS NC Push-button Reset Input Watchdog Input Watchdog Output Active-Low Reset Output Active-High Reset Output Supply Voltage PFI Power-fail Input PFO Power-fail Output Ground No Connect
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STM706T/S/R; STM706P; STM708T/S/R
Figure 8. Block Diagram (STM706T/S/R and STM706P)
WDI WDI Transitional Detector WATCHDOG TIMER
WDO
VCC VCC
VRST
COMPARE
MR
trec Generator
RST(RST)(1)
PFI VPFI COMPARE PFO
AI08829
Note: 1. For STM706P only.
Figure 9. Block Diagram (STM708T/S/R)
VCC VRST COMPARE RST VCC trec Generator RST
MR
PFI
VPFI
COMPARE
PFO
AI08830
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STM706T/S/R; STM706P; STM708T/S/R
Figure 10. Hardware Hookup
Regulator Unregulated Voltage VIN VCC VCC
0.1F
STM706T/S/R; STM706P; STM708T/S/R
WDI R1 From Microprocessor PFI R2 Push-button MR
(1)
WDO(1)
To Microprocessor IRQ
PFO RST RST
(2)
To Microprocessor NMI
To Microprocessor Reset
AI08843
Note: 1. For STM706T/S/R and STM706P. 2. For STM706P and STM708T/S/R.
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STM706T/S/R; STM706P; STM708T/S/R
OPERATION
Reset Output The STM70x Supervisor asserts a reset signal to the MCU whenever VCC goes below the reset threshold (VRST), a watchdog time-out occurs (if WDO is connected to MR), or when the Push-button Reset Input (MR) is taken low. RST is guaranteed to be a logic low (logic high for STM706P and STM708T/S/R) for VCC < VRST down to VCC =1V for TA = 0C to 85C. During power-up, once VCC exceeds the reset threshold an internal timer keeps RST low for the reset time-out period, trec. After this interval RST returns high. If VCC drops below the reset threshold, RST goes low. Each time RST is asserted, it stays low for at least the reset time-out period (trec). Any time VCC goes below the reset threshold the internal timer clears. The reset timer starts when VCC returns above the reset threshold. Push-button Reset Input A logic low on MR asserts reset. Reset remains asserted while MR is low, and for trec (see Figure 29., page 19) after it returns high. The MR input has an internal 40k pull-up resistor, allowing it to be left open if not used. This input can be driven with TTL/CMOS-logic levels or with open-drain/ collector outputs. Connect a normally open momentary switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If MR is driven from long cables or the device is used in a noisy environment, connect a 0.1F capacitor from MR to GND to provide additional noise immunity. MR may float, or be tied to VCC when not used. Watchdog Input (STM706T/S/R and STM706P) The watchdog timer can be used to detect an outof-control MCU. If the MCU does not toggle the Watchdog Input (WDI) within tWD (1.6sec), the Watchdog Output pin (WDO) is asserted. The internal 1.6sec timer is cleared by either: 1. a reset pulse, or 2. by toggling WDI (high-to-low or low-to-high), which can detect pulses as short as 50ns. See Figure 30., page 19 for STM706T/S/R and STM706P. The timer remains cleared and does not count for as long as reset is asserted. As soon as reset is released, the timer starts counting. Watchdog Output (STM706T/S/R and STM706P) When VCC drops below the reset threshold, WDO will go low even if the watchdog timer has not yet timed out. However, unlike the reset output, WDO goes high as soon as VCC exceeds the reset threshold. WDO may be used to generate a reset pulse by connecting it to the MR input. Power-fail Input/Output The Power-fail Input (PFI) is compared to an internal reference voltage (independent from the VRST comparator). If PFI is less than the power-fail threshold (VPFI), the Power-Fail Output (PFO) will go low. This function is intended for use as an undervoltage detector to signal a failing power supply. Typically PFI is connected through an external voltage divider (see Figure 10., page 8) to either the unregulated DC input (if it is available) or the regulated output of the VCC regulator. The voltage divider can be set up such that the voltage at PFI falls below VPFI several milliseconds before the regulated VCC input to the STM70x or the microprocessor drops below the minimum operating voltage. If the comparator is unused, PFI should be connected to VSS and PFO left unconnected. PFO may be connected to MR on the STM70x so that a low voltage on PFI will generate a reset output. Ensuring a Valid Reset Output Down to VCC = 0V When VCC falls below 1V, the state of the RST output can no longer be guaranteed, and becomes essentially an open circuit. If a high value pulldown resistor is added to the RST pin, the output will be held low during this condition. A resistor value of approximately 100k 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 11). Figure 11. Reset Output Valid to Ground Circuit
STM70x RST R1
AI08844
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Interfacing to Microprocessors with Bidirectional 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/O as in Figure 12. Figure 12. Interfacing to Microprocessors with Bi-directional Reset I/O
Buffered Reset to other System Components
VCC STM70x 4.7k RST RST
VCC Microprocessor
GND
GND
AI08845
TYPICAL OPERATING CHARACTERISTICS
Note: Typical values are at TA = 25C. Figure 13. Supply Current vs. Temperature (no load)
30
25
Supply Current (A)
20
15 VCC = 2.7V VCC = 3.0V VCC = 3.6V VCC = 4.5V VCC = 5.5V
10
5
0 -40 -20 0 20 40 60 80 100 120
AI09141b
Temperature (C)
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STM706T/S/R; STM706P; STM708T/S/R
Figure 14. VPFI Threshold vs. Temperature
1.270 1.265 1.260 VCC = 2.5V VCC = 3.0V VCC = 3.3V VCC = 3.6V
VPFI Threshold (V)
1.255 1.250 1.245 1.240 1.235 1.230 1.225 -40
-20
0
20
40
60
80
100
120
AI09142b
Temperature (C)
Figure 15. Reset Comparator Propagation Delay vs. Temperature
30 28 26
Propagation Delay (s)
24 22 20 18 16 14 12 10 -40 -20 0 20 40 60 80 100 120
AI09143b
Temperature (C)
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STM706T/S/R; STM706P; STM708T/S/R
Figure 16. Power-up trec vs. Temperature
240
235
230
trec (ms)
VCC = 3.0V 225 VCC = 4.5V VCC = 5.5V 220
215
210 -40 -20 0 20 40 60 80 100 120
AI09144b
Temperature (C)
Figure 17. Normalized Reset Threshold vs. Temperature
1.004
Normalized Reset Threshold
1.002
1.000
0.998
0.996 -40
-20
0
20
40
60
80
100
120
AI09145b
Temperature (C)
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STM706T/S/R; STM706P; STM708T/S/R
Figure 18. Watchdog Time-out Period vs. Temperature
1.90
Watchdog Time-out Period (sec)
1.85
1.80
1.75 VCC = 3.0V VCC = 4.5V VCC = 5.5V
1.70
1.65
1.60 -40
-20
0
20
40
60
80
100
120
AI09146b
Temperature (C)
Figure 19. PFI to PFO Propagation Delay vs. Temperature
4.0
PFI to PFO Propagation Delay (s)
VCC = 3.0V VCC = 3.6V 3.0 VCC = 4.5V VCC = 5.5V 2.0
1.0
0.0 -40 -20 0 20 40 60 80 100 120
AI09148b
Temperature (C)
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STM706T/S/R; STM706P; STM708T/S/R
Figure 20. Output Voltage vs. Load Current (VCC = 5V; VBAT = 2.8V; TA = 25C)
5.00
4.98
VOUT (V)
4.96 4.94 0 10 20 30 40 50
AI10496
IOUT (mA)
Figure 21. Output Voltage vs. Load Current (VCC = 0V; VBAT = 2.8V; TA = 25C)
2.80
2.78
2.76
VOUT (V)
2.74
2.72
2.70
2.68
2.66 0.0 0.2 0.4 0.6 0.8 1.0
AI10497
IOUT (mA)
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STM706T/S/R; STM706P; STM708T/S/R
Figure 22. RST Output Voltage vs. Supply Voltage
5 VRST VCC 5
4
4
VRST (V)
2
2
1
1
0
0
500ms/div
AI09149b
Figure 23. RST Output Voltage vs. Supply Voltage
5 VRST VCC 5
4
4
VRST (V)
2
2
1
1
0
0
500ms/div
AI09150b
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VCC (V)
3
3
VCC (V)
3
3
STM706T/S/R; STM706P; STM708T/S/R
Figure 24. Power-fail Comparator Response Time (Assertion)
5V
PFO
1V/div
0V 1.3V
PFI
500mV/div
0V 500ns/div
AI09153b
Figure 25. Power-fail Comparator Response Time (De-Assertion)
5V
PFO
1V/div
0V 1.3V
PFI
500mV/div
0V 500ns/div
AI09154b
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STM706T/S/R; STM706P; STM708T/S/R
Figure 26. Maximum Transient Duration vs. Reset Threshold Overdrive
6000
5000
Transient Duration (s)
4000
Reset occurs above the curve.
3000
2000
1000
0 0.001
0.01
0.1
1
10
AI09156b
Reset Comparator Overdrive, VRST - VCC (V)
MAXIMUM RATING
Stressing the device above the rating listed in the Absolute Maximum Ratings" table may 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 imTable 4. Absolute Maximum Ratings
Symbol TSTG TSLD(1) VIO VCC IO PD Parameter Storage Temperature (VCC Off) Lead Solder Temperature for 10 seconds Input or Output Voltage Supply Voltage Output Current Power Dissipation Value -55 to 150 260 -0.3 to VCC +0.3 -0.3 to 7.0 20 320 Unit C C V V mA mW
plied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
Note: 1. Reflow at peak temperature of 255C to 260C for < 30 seconds (total thermal budget not to exceed 180C for between 90 to 150 seconds).
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STM706T/S/R; STM706P; STM708T/S/R
DC AND AC PARAMETERS
This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC characteristics Tables that follow, are derived from tests performed under the Measurement Conditions summarized in Table 5, Operating and AC Measurement Conditions. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters.
Table 5. Operating and AC Measurement Conditions
Parameter VCC Supply Voltage Ambient Operating Temperature (TA) Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages STM70x 1.0 to 5.5 -40 to 85 5 0.2 to 0.8VCC 0.3 to 0.7VCC Unit V C ns V V
Figure 27. AC Testing Input/Output Waveforms
0.8VCC
0.7VCC 0.3VCC
AI02568
0.2VCC
Figure 28. Power-fail Comparator Waveform
VCC VRST
trec PFO
RST
AI08860a
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STM706T/S/R; STM706P; STM708T/S/R
Figure 29. MR Timing Waveform
MR tMLRL RST
(1)
tMLMH
trec
AI07837a
Note: 1. RST for STM706P and STM708T/S/R.
Figure 30. Watchdog Timing (STM706T/S/R and STM706P)
VCC
RST
trec
WDI
tWD
WDO
AI08833
Table 6. DC and AC Characteristics
Sym VCC ICC Alternative Description Operating Voltage VCC < 3.6V VCC Supply Current Input Leakage Current (WDI) Input Leakage Current (PFI) ILI Input Leakage Current (MR) 4.5V < VCC < 5.5V VIH VIH VIL VIL 4.5V < VCC < 5.5V Input High Voltage (MR) VRST (max) < VCC < 3.6V Input High Voltage (WDI) Input Low Voltage (MR) VRST (max) < VCC < 3.6V Input Low Voltage (WDI) VRST (max) < VCC < 5.5V 0.6 0.3VCC V V VRST (max) < VCC < 5.5V 4.5V < VCC < 5.5V 0.7VCC 0.7VCC 0.8 V V V 75 2.0 125 300 A V VCC < 5.5V 0V = VIN = VCC 0V = VIN = VCC VRST (max) < VCC < 3.6V -1 -25 25 2 80 Test Condition(1) Min 1.2(2) 35 40 Typ Max 5.5 50 60 +1 +25 250 Unit V A A A nA A
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STM706T/S/R; STM706P; STM708T/S/R
Alternative Test Condition(1) VCC = VRST (max), ISINK = 3.2mA ISINK = 50A, VCC = 1.0V, TA = 0C to 85C ISINK = 100A, VCC = 1.2V Output High Voltage (RST, RST, WDO) VOH Output High Voltage (PFO) Power-fail Comparator VPFI tPFD PFI Input Threshold PFI to PFO Propagation Delay PFI Falling (STM70xP/R, VCC = 3.0V; STM70xS/T, VCC = 3.3V) 1.20 1.25 2 1.30 V s ISOURCE = 1mA, VCC = VRST (max) ISOURCE = 75A, VCC = VRST (max) 2.4 0.8VCC
Sym VOL
Description Output Low Voltage (PFO, RST, RST, WDO)
Min
Typ
Max 0.3 0.3 0.3
Unit V V V V V
VOL
Output Low Voltage (RST)
Reset Thresholds STM706P/70xR VRST Reset Threshold
(3)
2.55 2.85 3.00
2.63 2.93 3.08 20
2.70 3.00 3.15
V V V mV
STM70xS STM70xT
Reset Threshold Hysteresis trec RST Pulse Width 140
200
280
ms
Push-button Reset Input tMLMH tMR VRST (max) < VCC < 3.6V MR Pulse Width 4.5V < VCC < 5.5V VRST (max) < VCC < 3.6V MR to RST Output Delay 4.5V < VCC < 5.5V 250 ns 150 750 ns ns 500 ns
tMLRL
tMRD
Watchdog Timer (STM706T/S/R and STM706P) STM706P/70xR, VCC = 3.0V Watchdog Timeout Period STM70xS/70XT, VCC = 3.3V 4.5V < VCC < 5.5V WDI Pulse Width VRST (max) < VCC < 3.6V 100 ns
Note: 1. Valid for Ambient Operating Temperature: TA = -40 to 85C; VCC = VRST (max) to 5.5V (except where noted). 2. VCC (min) = 1.0V for TA = 0C to +85C. 3. For VCC falling.
tWD
1.12
1.60
2.24
s
50
ns
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STM706T/S/R; STM706P; STM708T/S/R
PACKAGE MECHANICAL
Figure 31. SO8 - 8-lead Plastic Small Outline, 150 mils body width, Package Mechanical
h x 45 A2 B e D A C ddd
8
E
1
H A1 L
SO-A
Note: Drawing is not to scale.
Table 7. SO8 - 8-lead Plastic Small Outline, 150 mils body width, Package Mechanical Data
mm Symb Typ A A1 B C D ddd E e H h L N - - - - - - - 1.27 - - - - Min 1.35 0.10 0.33 0.19 4.80 - 3.80 - 5.80 0.25 0.40 0 8 Max 1.75 0.25 0.51 0.25 5.00 0.10 4.00 - 6.20 0.50 0.90 8 Typ - - - - - - - 0.050 - - - - Min 0.053 0.004 0.013 0.007 0.189 - 0.150 - 0.228 0.010 0.016 0 8 Max 0.069 0.010 0.020 0.010 0.197 0.004 0.157 - 0.244 0.020 0.035 8 inches
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STM706T/S/R; STM706P; STM708T/S/R
Figure 32. TSSOP8 - 8-lead, Thin Shrink Small Outline, 3x3mm body size, Outline
D
8
5 E1 E
c
1
4
A1 A CP b e A2
L L1
TSSOP8BM
Note: Drawing is not to scale.
Table 8. TSSOP8 - 8-lead, Thin Shrink Small Outline, 3x3mm body size, Mechanical Data
mm Symb Typ A A1 A2 b c CP D e E E1 L L1 N - - 0.85 - - - 3.00 0.65 4.90 3.00 0.55 0.95 - Min - 0.05 0.75 0.25 0.13 - 2.90 - 4.65 2.90 0.40 - 0 8 Max 1.10 0.15 0.95 0.40 0.23 0.10 3.10 - 5.15 3.10 0.70 - 6 Typ - - 0.034 - - - 0.118 0.026 0.193 0.118 0.022 0.037 - Min - 0.002 0.030 0.010 0.005 - 0.114 - 0.183 0.114 0.016 - 0 8 Max 0.043 0.006 0.037 0.016 0.009 0.004 0.122 - 0.203 0.122 0.030 - 6 inches
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STM706T/S/R; STM706P; STM708T/S/R
PART NUMBERING
Table 9. Ordering Information Scheme
Example: STM706 T M 6 E
Device Type STM706 STM708
Reset Threshold Voltage T: 3.00V VRST 3.15V S: 2.88V VRST 3.00V R, STM706P: 2.59V VRST 2.70V
Package M = SO8 DS = TSSOP8
Temperature Range 6 = -40 to 85C
Shipping Method E = Tubes F = Tape & Reel
For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you.
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STM706T/S/R; STM706P; STM708T/S/R
Table 10. Marking Description
Part Number STM706P Reset Threshold 2.63V TSSOP8 SO8 STM706T 3.08V TSSOP8 SO8 STM706S 2.93V TSSOP8 SO8 STM706R 2.63V TSSOP8 SO8 STM708T 3.08V TSSOP8 SO8 STM708S 2.93V TSSOP8 SO8 STM708R 2.63V TSSOP8 708R 708S 708T 706R 706S 706T Package SO8 706P Topside Marking
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STM706T/S/R; STM706P; STM708T/S/R
REVISION HISTORY
Table 11. Document Revision History
Date October 2003 12-Dec-03 16-Jan-04 09-Apr-04 25-May-04 02-Jul-04 21-Sep-04 25-Feb-05 Version 1.0 2.0 2.1 3.0 4.0 5.0 6.0 7.0 First Issue Reformatted; update characteristics (Figure 2, 3, 8, 9, 10, 28, 29, 30; Table 6, 7, 8, 9) Add Typical Operating Characteristics (Figure 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26) Reformatted; update characteristics (Figure 15, 19, 22, 23, 26; Table 6) Update characteristics (Table 3, 6) Datasheet promoted; waveform corrected (Figure 28) Clarify root part numbers; (Figure 2, 3, 4, 5, 6, 7, 8, 9, 10, 30; Table 1, 3, 6, 9) Update Typical Characteristics (Figure 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26) Revision Details
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STM706T/S/R; STM706P; STM708T/S/R
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
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