Maxim Integrated DS1693

Description
The DS1689/DS1693 are 3V or 5V serialized real-time clocks (RTCs) with NV RAM control. They incorporate industry-standard DS1287 PC clock features and enhanced features, including a 64-bit silicon serial number, 64-bit customer-specific ROM or additional serial number, power control circuitry that supports system power-on from date/time alarm or key closure, automatic battery backup and write protection to external SRAM, a crystal select bit that allows the RTC to operate with 6pF or 12.5pF crystal, 114 bytes of user NV RAM, an auxiliary battery input, and a RAM clear input.

Features
Incorporates industry-standard DS1287 PC clock plus enhanced features
64-bit silicon serial number
64-bit customer-specific ROM or additional serial number available
Power control circuitry supports system power-on from date/time alarm or key closure
Automatic battery backup and write protection to external SRAM
Crystal select bit allows RTC to operate with 6pF or 12.5pF crystal
114 bytes user NV RAM
Auxiliary battery input
RAM clear input
Century register
32kHz output for power management
32-bit Vcc powered elapsed time counter
32-bit VBAT powered elapsed time counter
16-bit power cycle counter
Compatible with existing BIOS for original DS1287 functions
Available as IC (DS1689) or stand-alone module with embedded battery and crystal (DS1693)
Available in industrial temperature version
Timekeeping algorithm includes leap year compensation valid up to 2100

Applications
Timekeeping and date stamping
System power management
Security systems
Industrial control
Medical devices
Point-of-sale terminals
Data loggers
Instrumentation