Overview
The DS1338Z-33+T&R is a serial real-time clock (RTC) manufactured by Analog Devices Inc./Maxim Integrated. This low-power, full binary-coded decimal (BCD) clock/calendar 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, non-volatile SRAM. The device operates through an I²C serial interface and is available in various surface-mount packages, including the SOP-8 package for the DS1338Z-33+T&R model.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage (VCC) | 3.0 to 5.5 | V |
| Power-Fail Voltage (VPF) | 2.70 to 2.97 | V |
| Input Voltage (VIL, VIH) | 0.3 x VCC to 0.7 x VCC + 0.3 | V |
| Operating Temperature Range | -40°C to +85°C | °C |
| Package Type | SOP-8 | |
| Interface | I²C Serial Interface | |
| SRAM Capacity | 56 bytes | bytes |
| Backup Supply | Battery-Backed |
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, non-volatile SRAM with unlimited writes.
- Programmable square-wave output signal.
- Surface-mount package with an integrated crystal (for certain models) to save space and simplify design.
- Interfaces with most microcontrollers via I²C serial interface.
- Low-power operation extends battery backup run time.
- Automatic power-fail detect and switch circuitry to maintain time and date operation during power failures.
- Industrial temperature range of -40°C to +85°C supports operation in a wide range of applications.
- Underwriters Laboratories (UL) recognized.
Applications
- Consumer Electronics: Set-Top Box, Digital Recording, Network Appliance.
- Handhelds: GPS, POS Terminal.
- Medical: Glucometer, Medicine Dispenser.
- Office Equipment: Fax/Printer, Copier.
- Telecommunications: Router, Switcher, Server.
- Other: Utility Meter, Vending Machine, Thermostat, Modem.
Q & A
- What is the primary function of the DS1338Z-33+T&R? The primary function is to manage all timekeeping functions as a real-time clock (RTC) and provide additional non-volatile SRAM.
- What is the operating temperature range of the DS1338Z-33+T&R? The operating temperature range is -40°C to +85°C.
- What type of interface does the DS1338Z-33+T&R use? It uses an I²C serial interface.
- How much SRAM does the DS1338Z-33+T&R have? It has 56 bytes of battery-backed, non-volatile SRAM.
- What is the power-fail detection feature of the DS1338Z-33+T&R? It has automatic power-fail detect and switch circuitry to maintain time and date operation during power failures.
- In what package type is the DS1338Z-33+T&R available? It is available in an SOP-8 package.
- Is the DS1338Z-33+T&R UL recognized? Yes, it is Underwriters Laboratories (UL) recognized.
- What are some common applications of the DS1338Z-33+T&R? Common applications include consumer electronics, handheld devices, medical equipment, office equipment, telecommunications, and other industrial applications.
- Does the DS1338Z-33+T&R support leap-year compensation? Yes, it supports leap-year compensation valid up to 2100.
- Can the DS1338Z-33+T&R operate in both 24-hour and 12-hour formats? Yes, it can operate in both 24-hour and 12-hour formats with an AM/PM indicator.
