Overview
The ADM8691ARNZ is a microprocessor supervisory circuit produced by Analog Devices Inc. This component is part of the ADM8690–ADM8695 family, designed to provide comprehensive single-chip solutions for power supply monitoring and battery control. It is particularly useful in microprocessor systems, computers, controllers, intelligent instruments, and automotive systems. The ADM8691ARNZ offers a range of functions including power-on reset, battery backup switching, watchdog timer, and power-fail warning, ensuring robust and reliable operation in various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Nominal Reset Time | 50 ms or ADJ | ||||
| Nominal VCC Reset Threshold | 4.5 V | 4.65 V | 4.73 V | V | |
| Watchdog Timeout Period (Internal Oscillator) | 1.0 sec | 1.6 sec | 2.25 sec | Seconds | Long period |
| Watchdog Timeout Period (Internal Oscillator) | 70 ms | 100 ms | 140 ms | ms | Short period |
| Battery Backup Switching | Yes | ||||
| Standby Current | 400 nA | nA | |||
| Chip Enable Gating CEIN Threshold | 0.8 V | 3.0 V | V | VIL, VIH | |
| CEOUT Output Voltage | 0.4 V | V | ISINK = 3.2 mA | ||
| CE Propagation Delay | 3 ns | 7 ns | ns |
Key Features
- Power-on Reset Output: Provides a reset output during power-up, power-down, and brownout conditions, operational with VCC as low as 1 V.
- Battery Backup Switching: Automatically switches to battery backup for CMOS RAM, CMOS microprocessors, or other low-power logic.
- Watchdog Timer: Generates a reset pulse if the optional watchdog timer is not toggled within a specified time.
- Power-Fail Warning: Includes a 1.3 V threshold detector for power-fail warning, low battery detection, or monitoring a power supply other than 5 V.
- High Current Drive: Capable of driving up to 100 mA without the need for an external pass transistor.
- Fast Chip Enable Gating: Extremely fast gating of chip enable signals (3 ns).
- Low Power Consumption: Consumes only 0.7 mW, ensuring low power operation.
Applications
- Microprocessor Systems: Ideal for monitoring and controlling power supplies in microprocessor-based systems.
- Computers and Controllers: Used in various computer and controller applications to ensure reliable power management.
- Intelligent Instruments: Suitable for intelligent instruments that require robust power monitoring and control.
- Automotive Systems: Applied in automotive systems for reliable power supply management and battery backup.
Q & A
- What is the primary function of the ADM8691ARNZ?
The primary function of the ADM8691ARNZ is to provide power supply monitoring and battery control for microprocessor systems.
- What is the minimum VCC voltage for the RESET output to remain operational?
The RESET output remains operational with VCC as low as 1 V.
- What is the maximum current drive capability of the ADM8691ARNZ?
The ADM8691ARNZ can drive up to 100 mA without the need for an external pass transistor.
- What is the purpose of the watchdog timer in the ADM8691ARNZ?
The watchdog timer generates a reset pulse if it is not toggled within a specified time, ensuring system reliability.
- What package type is the ADM8691ARNZ available in?
The ADM8691ARNZ is available in a 16-lead SOIC package.
- What is the standby current of the ADM8691ARNZ?
The standby current of the ADM8691ARNZ is 400 nA.
- How fast is the chip enable gating in the ADM8691ARNZ?
The chip enable gating in the ADM8691ARNZ is extremely fast, with a propagation delay of 3 ns.
- What is the power consumption of the ADM8691ARNZ?
The ADM8691ARNZ consumes only 0.7 mW.
- Can the ADM8691ARNZ be used in automotive systems?
Yes, the ADM8691ARNZ can be used in automotive systems for reliable power supply management and battery backup.
- What is the nominal VCC reset threshold of the ADM8691ARNZ?
The nominal VCC reset threshold of the ADM8691ARNZ is 4.65 V.
