DS1747-70+ datasheet by Maxim Integrated Products

DS1747-70+ Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the DS1747-70+?
  The recommended power-up sequence is to apply VCC first, followed by VPP, and then VDD. This ensures proper initialization of the device.
• How do I ensure data integrity when using the DS1747-70+ in a noisy environment?
  To ensure data integrity, use a low-pass filter on the VCC and VDD pins to reduce noise, and consider using a decoupling capacitor between VCC and GND. Additionally, use a shielded cable for the data lines and keep the signal lines as short as possible.
• What is the maximum clock frequency supported by the DS1747-70+?
  The maximum clock frequency supported by the DS1747-70+ is 10 MHz. Exceeding this frequency may result in unreliable operation or damage to the device.
• Can I use the DS1747-70+ in a 3.3V system?
  Yes, the DS1747-70+ can operate in a 3.3V system, but the VPP pin must be connected to a 5V supply. The device's internal logic operates at 3.3V, but the programming voltage (VPP) requires 5V.
• How do I handle the HOLD pin during power-up and power-down?
  During power-up, the HOLD pin should be held low until the power supply has stabilized. During power-down, the HOLD pin should be held low until the power supply has dropped below 1.5V to prevent unwanted writes to the device.