The DS1602 is a real-time clock/elapsed time counter designed to count seconds when VCC power is applied and continually count seconds under battery backup power with an accuracy of two 32-bit counters. The counters can track seconds for over 125 years. It can count seconds from the time the battery is attached until VBAT is less than 2.5V. It can also count seconds while VCC is above VTP and retain the count in the absence of VCC under battery backup power. The clear function resets the selected counter to 0. The read/write serial port affords low pin count. The maximum current drain is less than 1µA from the VBAT pin when the serial port is disabled. It uses a one byte protocol to define read/write, counter address, and software clear function. It is available in an 8-pin DIP or optional 8-pin SOIC package. It operates in a temperature range of -40°C to +85°C. It can operate with reduced performance down to VCC = 2.5V. It is recognized by Underwriters Laboratory (UL).
The DS1602 provides two 32‑bit counters that track real‑time and elapsed time, counting seconds for over 125 years. It operates from VCC power or a backup battery, with a clear function, low current drain, and a simple 3‑wire serial protocol for read/write operations.
Available in 8‑pin DIP and SOIC packages, the device operates from –40 °C to +85 °C and supports a 32.768 kHz crystal or external oscillator. Electrical specifications include low active supply current, minimal battery leakage, and defined voltage ranges for VCC and VBAT.
| Supply Voltage VCC | 4.5 V – 5.5 V |
|---|---|
| Battery Supply Voltage VBAT | 2.5 V – 3.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Active Supply Current ICC | 1 mA |
| Timekeeping Current ICC1 | 50 µA |
| Battery Leakage Current IBATL | 100 nA |
| Crystal Load Capacitance CX | 6 pF |
It contains two 32‑bit counters for real‑time and elapsed time tracking.
The device draws less than 1 µA from the VBAT pin when the serial port is disabled.
A battery with an output voltage between 2.5 V and 3.5 V is required.