Overview
The DS1338Z-33+ is a low-power serial real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated. This device is designed to manage all timekeeping functions, including seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100. It also features 56 bytes of battery-backed, general-purpose non-volatile SRAM (NV SRAM). The DS1338Z-33+ is known for its low-power operation, which extends battery backup run time, and its automatic power-fail detect and switch circuitry. It operates over an industrial temperature range of -40°C to +85°C and is UL® recognized.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package | SOIC-8 / SOP-8 | |
| Temperature Range | -40°C to +85°C | |
| Supply Voltage | 1.89V, 3.30V, 3.63V | V |
| Active Supply Current | 75-200 µA (depending on VCC) | µA |
| Input Leakage | 1 µA | µA |
| SDA Logic 0 Output | 3.0 mA (VCC > 2V) | mA |
| SQW/OUT Logic 0 Output | 3.0 mA (VCC > 2V) | mA |
| Capacitive Load for Each Bus Line | 400 pF | pF |
| I/O Capacitance (SDA, SCL) | 10 pF | pF |
Key Features
- Completely manages all timekeeping functions, including seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100.
- 56 bytes of battery-backed, general-purpose NV SRAM with unlimited writes.
- Programmable square-wave output signal.
- Surface-mount package with an integrated crystal (DS1338C) saves additional space and simplifies design.
- Interfaces with most microcontrollers via I²C serial interface.
- Low-power operation extends battery backup run time.
- Automatic power-fail detect and switch circuitry.
Applications
The DS1338Z-33+ is versatile and can be used in a wide range of applications due to its industrial temperature range and low-power operation. It is suitable for use in various electronic devices that require accurate timekeeping, such as:
- Industrial control systems
- Medical devices
- Automotive systems
- Consumer electronics
- IoT devices
Q & A
- What is the primary function of the DS1338Z-33+?
The primary function of the DS1338Z-33+ is to manage all timekeeping functions, including seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation.
- What type of memory does the DS1338Z-33+ include?
The DS1338Z-33+ includes 56 bytes of battery-backed, general-purpose NV SRAM.
- What is the temperature range of the DS1338Z-33+?
The DS1338Z-33+ operates over an industrial temperature range of -40°C to +85°C.
- How does the DS1338Z-33+ handle power failures?
The DS1338Z-33+ has automatic power-fail detect and switch circuitry that maintains time and date operation by switching to the backup supply when the main power fails.
- What interface does the DS1338Z-33+ use for communication?
The DS1338Z-33+ uses an I²C serial interface for communication with microcontrollers.
- What is the package type of the DS1338Z-33+?
The DS1338Z-33+ is available in SOIC-8 and SOP-8 packages.
- Is the DS1338Z-33+ UL recognized?
Yes, the DS1338Z-33+ is UL recognized.
- What are the typical supply voltages for the DS1338Z-33+?
The typical supply voltages for the DS1338Z-33+ are 1.89V, 3.30V, and 3.63V.
- How much current does the DS1338Z-33+ typically consume?
The active supply current of the DS1338Z-33+ ranges from 75 to 200 µA depending on the supply voltage.
- What is the significance of the integrated crystal in the DS1338Z-33+?
The integrated crystal in the DS1338Z-33+ saves additional space and simplifies the design by eliminating the need for an external crystal.
