Product Summary

The DS14285S+ is a Real Time Clock with NVRAM Control. It provides the industry standard DS1287 clock function with the additional feature of providing nonvolatile control for an external SRAM. For the DS14285S+ a lithium energy source, quartz crystal, and write protection circuitry are contained within a 24-pin dual in-line package. The DS14285S+ requires an external quartz crystal connected to the X1 and X2 pins as well as an external energy source connected to the VBAT pin. A standard 32.768 kHz quartz crystal can be directly connected to the DS14285S+ via pins 1 and 2 (X1, X2). The crystal selected for use should have a specified load capacitance (CL) of 6 pF.

Parametrics

DS14285S+ absolute maximum ratings: (1)Voltage Range on Any Pin Relative to Ground: -0.5V to +7.0V; (2)Storage Temperature Range: -40 to +85℃; (3)Soldering Temperature: DIP: 260℃ for 10 seconds.

Features

DS14285S+ features: (1)Direct Replacement for IBM AT Computer Clock/Calendar; (2)Functionally Compatible with the DS1285/DS1287; (3)Available as Chip (DS14285, DS14285S, or DS14285Q) or Stand-Alone Module with Embedded Lithium Battery and Crystal (DS14287); (4)Automatic Backup Supply and Write Protection to Make External SRAM Nonvolatile; (5)Counts Seconds, Minutes, Hours, Days, Day of the Week, Date, Month, and Year with Leap Year Compensation Valid Up to 2100; (6)Binary or BCD Representation of Time, Calendar, and Alarm; (7)12- or 24-Hour Clock with AM and PM in 12-Hour Mode; (8)Daylight Saving Time Option; (9)Multiplex Bus for Pin Efficiency; (10)Interfaced with Software as 128 RAM Locations 14 Bytes of Clock and Control Registers 114 Bytes of General Purpose RAM; (11)Programmable Square-Wave Output Signal.

Diagrams

DS14285S+ block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS14285S+
DS14285S+
Maxim Integrated Products
Real Time Clock
Data Sheet
Negotiable 
DS14285S+T&R
DS14285S+T&R
Maxim Integrated Products
Real Time Clock
Data Sheet
Negotiable