DS1603 is a dual counter real-time clock/elapsed time counter produced by Maxim, which has 2.5V battery power, 10-year ultra-long running time and ±2 minutes/month clock accuracy. The device adopts 32-bit dual counters, which can respectively record real-time time and cumulative time, respectively, under VCC and VBAT power supply.
The DS1603 module provides two 32‑bit counters for real‑time and elapsed‑time tracking, powered by VCC or an internal lithium cell when VCC is absent. It features a 3‑wire serial interface, a one‑byte protocol, and a 1 Hz crystal with ±2 min/month accuracy.
The document includes detailed pin assignments, electrical specifications, timing diagrams, and package dimensions, as well as guidance on operation, protocol handling, and power‑up behavior.
| Supply Voltage VCC | 4.5 V – 5.5 V |
|---|---|
| Operating Temperature Range | 0 °C – +70 °C |
| Battery Trip Point VTP | 3.0 V – 4.5 V |
| Timekeeping Current ICC1 | 50 µA |
| Active Supply Current ICC | 1 mA |
The built‑in crystal provides a timing accuracy of ±2 minutes per month.
The DS1603 is supplied in a 7‑pin SIP package.
Communication uses a 3‑wire serial port consisting of RST, CLK, and DQ pins.