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Below is the parameter table and instructions for the MAX690ACSA, a watchdog timer with manual reset.

MAX690ACSA Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	VCC	2.7	-	5.5	V	-
Operating Temperature	Toper	-40	-	+85	°C	-
Storage Temperature	Tstg	-65	-	+150	°C	-
Input Current (RESET)	IIN	-1	-	5	μA	VIN = VCC, VOUT = 0V
Output Current (RESET)	IOUT	-10	-	10	mA	VOUT = 0V, VCC = 5V
Watchdog Timeout	tWDT	1.6	-	2.4	s	-
Manual Reset Time	tMR	1.6	-	2.4	s	-
Reset Pulse Width	tRST	200	-	400	ms	-
Power-on Reset Delay	tPOR	140	-	210	ms	-
Quiescent Current	IQ	1	-	3	μA	VCC = 5V, no load

Instructions for MAX690ACSA

1. Pin Configuration

• 1 (VCC): Supply voltage input.
• 2 (GND): Ground.
• 3 (RESET): Active-low reset output.
• 4 (WDT): Watchdog timer input.
• 5 (MR): Manual reset input.
• 6 (NC): No connect.

2. Operation

• Power-On Reset (POR):

  • The device automatically generates a reset pulse when power is applied. The reset pulse width is approximately 200 to 400 ms, ensuring that the system initializes correctly.

• Watchdog Timer (WDT):

  • The watchdog timer resets if the WDT pin is not toggled within the timeout period (1.6 to 2.4 seconds). The reset pulse width is 200 to 400 ms.
  • To prevent a reset, the WDT pin must be toggled before the timeout period expires.

• Manual Reset (MR):

  • A low pulse on the MR pin for at least 1.6 to 2.4 seconds will generate a reset pulse. The reset pulse width is 200 to 400 ms.
  • This can be used to manually reset the system without waiting for the watchdog timer.

• Reset Output (RESET):

  • The RESET pin goes low during a reset condition, which can be used to reset other devices or microcontrollers in the system.

3. Application Notes

• Decoupling Capacitors:
  • Place a 0.1 μF ceramic capacitor as close as possible to the VCC and GND pins to filter out noise and ensure stable operation.
• Pull-Up Resistors:
  • Use pull-up resistors on the WDT and MR pins if they are not actively driven by external circuits.
• Power Supply:
  • Ensure the supply voltage is within the specified range (2.7V to 5.5V) to avoid damage to the device.

4. Example Circuit

• Basic Connection:
  • Connect VCC to the power supply.
  • Connect GND to ground.
  • Connect the RESET pin to the reset input of the microcontroller or system.
  • Connect the WDT pin to a microcontroller output that toggles periodically.
  • Connect the MR pin to a manual reset switch or button.

This table and the instructions should provide you with the necessary information to use the MAX690ACSA effectively in your design.

(For reference only)