Overview
The DP8573AV/NOPB is a Real-Time Clock (RTC) integrated circuit produced by Texas Instruments. It is designed for use in microprocessor-based systems where time and date information are crucial for multi-tasking, data logging, or general time of day/date requirements. The device is implemented in low voltage silicon gate microCMOS technology, ensuring low standby power consumption, particularly in battery-backed environments. The DP8573A features a contiguous block of memory or I/O ports organized as one block of 32 bytes, including control registers, clock counters, alarm compare RAM, and time save RAM.
Key Specifications
| Parameter | Value |
|---|---|
| Package | PLCC (FN) with 28 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage (VCC) | 4.5V to 5.5V |
| Supply Voltage (VBB) | 2.2V to VCC - 0.4V |
| Crystal Frequency | 32.768 kHz |
| Memory Organization | 32 bytes (Control Registers, Clock Counters, Alarm Compare RAM, Time Save RAM) |
| Interrupt Types | Periodic, Alarm/Compare, Power Fail |
| Power Dissipation | 500 mW |
| Storage Temperature Range | -65°C to 150°C |
Key Features
- Full function real-time clock/calendar with 12/24 hour mode timekeeping
- Day of week and day of month counters
- Parallel resonant oscillator requiring a 32.768 kHz crystal and two capacitors
- Power fail features including internal power supply switch to external battery and power supply bus glitch protection
- Automatic log of time into RAM at power failure
- On-chip interrupt structure with periodic, alarm, and power fail interrupts
- Low standby power consumption in battery-backed environments
Applications
The DP8573AV/NOPB is suitable for various applications requiring precise time and date information, including:
- Microprocessor-based systems for multi-tasking and data logging
- Telecommunications applications for synchronization and timing control
- Systems requiring battery-backed real-time clock functionality
- General time of day/date information in embedded systems
Q & A
- What is the primary function of the DP8573AV/NOPB?
The primary function of the DP8573AV/NOPB is to serve as a real-time clock (RTC) and calendar in microprocessor-based systems.
- What is the operating temperature range of the DP8573AV/NOPB?
The operating temperature range is -40°C to 85°C.
- What type of package does the DP8573AV/NOPB come in?
The DP8573AV/NOPB comes in a PLCC (FN) package with 28 pins.
- What is the required crystal frequency for the DP8573AV/NOPB?
The required crystal frequency is 32.768 kHz.
- Does the DP8573AV/NOPB support battery-backed operation?
- What types of interrupts does the DP8573AV/NOPB provide?
The DP8573AV/NOPB provides periodic, alarm/compare, and power fail interrupts.
- How does the DP8573AV/NOPB handle power failure?
The device logs the time into RAM automatically at power failure and issues a power fail interrupt. It also switches to the battery supply when VBB > VCC.
- What is the memory organization of the DP8573AV/NOPB?
The memory is organized as a contiguous block of 32 bytes, including control registers, clock counters, alarm compare RAM, and time save RAM.
- What are the key power specifications of the DP8573AV/NOPB?
The supply voltage (VCC) is 4.5V to 5.5V, and the battery supply voltage (VBB) is 2.2V to VCC - 0.4V.
- What are some common applications of the DP8573AV/NOPB?
- How does the DP8573AV/NOPB ensure low power consumption?
