G691

·Precision Monitoring of +3V, +3.3V, and +5V  Power-Supply Voltages
·Fully Specified Over Temperature
·Available in Three Output Configurations
   Push-Pull  RESET Output (G690L)
   Push-Pull RESET Output (G690H)
   Open-Drain RESET Output (G691L)
·140ms min Power-On Reset Pulse Width
·10µA Supply Current
·Guaranteed Reset Valid to V_CC = +1V
·Power Supply Transient Immunity
·No External Components
·3-Pin SOT89, SOT23 and SC70 Packages

Terminal Voltage (with respect to GND)
V_CC...........................................................................0.3V to +6.0V
RESET,RESET (push-pull)...............................-0.3V to (V_CC + 0.3V) 
RESET (open drain)..................................................-0.3V to +6.0V
Input Current, V_CC ................................................................20mA
Output Current, RESET,  RESET ..............................................20mA
Continuous Power Dissipation (T_A = +70)
3-Pin SOT89............................................500mW
3-Pin SOT23 (derate 4mW/ above +70)..........................320mW
3-Pin SC70 (derate 2.17mW/ above +70).......................174mW
Operating Temperature Range...................................40 to +105
Storage Temperature Range.....................................-65 to +150
Lead Temperature (soldering, 10s) ........................................+300

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rat-ings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of  the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The G690/G691 are microprocessor (µP) supervisory  circuits used to monitor the power supplies in µP and  digital systems. G690/G691 provide excellent circuit reliability  and low cost by eliminating external components and  adjustments when used with +5V, +3.3V, +3.0V- pow- ered circuits.

These circuits of G690/G691 perform a single function: they assert a  reset signal whenever the V_CC supply voltage declines  below a preset threshold, keeping it asserted for at  least 140ms after V_CC has risen above the reset  threshold. Reset thresholds suitable for operation with  a variety of supply voltages are available.

The G691L has an open-drain output stage, while the  G690 have push-pull outputs. The G691L's open-drain  RESET   output requires a pull-up resistor that can be  connected to a voltage higher than V_CC. The G690L  have an active-low  RESET   output, while the G690H  has an active-high RESET output. The reset com- parator is designed to ignore fast transients on V_CC,  and the outputs are guaranteed to be in the correct  logic state for V_CC down to 1V.

Low supply current makes the G690/G691 ideal for  use in portable equipment. The G690/G691 are avail- able in 3-pin SOT89 or SOT23 or SC70 packages.