STM690SM6F STMicroelectronics, STM690SM6F Datasheet - Page 17

• Manufacturer Part Number: STM690SM6F
• Description: SUPERVISOR 3V SWITCH OVER 8SOIC
• Manufacturer: STMicroelectronics
• Type: Simple Reset/Power-On Resetr

Specifications of STM690SM6F

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.925V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Monitored Voltage: 1 V to 5.5 V
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Backup
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 60 uA
• Maximum Power Dissipation: 320 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: Yes
• Threshold Voltage: 2.935V
• No. Of Supervisors / Monitors: 1
• Supply Voltage Range: 1.1V To 5.5V
• Reset Type: Active-Low
• Supply Current: 40µA
• Delay Time: 200ms
• Digital Ic Case Style: SOIC
• Rohs Compliant: Yes
• Undervoltage Threshold: 2.85 V
• Overvoltage Threshold: 3 V
• Output Type: Active Low
• Power-up Reset Delay (typ): 280 ms
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3826-2

STM690, STM704, STM795, STM802, STM804, STM805, STM806
Figure 12. Chip enable waveform (STM795)
2.8
2.9
E CON
RST
E
V CC
Power-fail input/output (NOT available on STM795)
The Power-Fail Input (PFI) is compared to an internal reference voltage (independent from
the V
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
of the V
below V
804/805/806 or the microprocessor drops below the minimum operating voltage.
During battery backup, the power-fail comparator is turned off and PFO goes (or remains)
low (see
the power-fail comparator is enabled and PFO follows PFI. If the comparator is unused, PFI
should be connected to V
the STM704/806 so that a low voltage on PFI will generate a reset output.
Applications information
These supervisor circuits are not short-circuit protected. Shorting V
excluding power-up transients such as charging a decoupling capacitor - destroys the
device. Decouple both V
the device as possible.
V RST
V BAT
Figure
RST
CC
PFI
Figure
comparator). If PFI is less than the power-fail threshold (V
t rec
regulator. The voltage divider can be set up such that the voltage at PFI falls
several milliseconds before the regulated V
10) to either the unregulated DC input (if it is available) or the regulated output
½ tr ec
13). This occurs after V
CC
SS
½ t rec
10 µs
and V
and PFO left unconnected. PFO may be connected to MR on
Doc ID 10519 Rev 9
BAT
t rec
pins to ground by placing 0.1 µF capacitors as close to
CC
drops below V
CC
input to the STM690/704/795/802/
SW
(2.4 V). When power returns,
OUT
PFI
), the Power-Fail
to ground -
Operation
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