DS1501Y

Interface:	Parallel
Base Part Number:	DS1501
Supplier Device Package:	28-PDIP
Package / Case:	28-DIP (0.600", 15.24mm)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C
Current - Timekeeping (Max):	5mA @ 4.5V ~ 5.5V
Voltage - Supply, Battery:	2.5 V ~ 3.7 V
Voltage - Supply:	4.5 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (24 hr)
Memory Size:	256B
Features:	Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K
Type:	Clock/Calendar
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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DS1501Y Application Field and Working PrincipleReal-time clocks (RTCs) are used in various applications such as data loggers and instrumentation systems for precise timing and recording. The Maxim Integrated DS1501Y is a low-power, low-skew, real-time clock and calendar IC in a 14-pin SOIC package. This device integrates a crystal oscillator, time base circuit and time-keeping/calendar logic, which offer a high level of system integration, accuracy and low power consumption.In this article, we will explore the features, application field, and working principle of the Maxim Integrated DS1501Y. Features:The DS1501Y is a low-power, low-skew, real-time clock and calendar IC with the features mentioned below- •Power supply voltage of 3.0V to 3.6 V •Accuracy of ±2 minutes per month or ±30ppm •Four-wire serial interface •Selectable crystal frequency range of 32.768 kHz or 10-MHz •Flexible fastening options •Dimensions of 14-pin SOIC package •Power down feature with a leakage current of less than 30 nA •External signal input reference •Integrated Regulator and crystal buffer •Slew rate: < 10µs •Operating temperature range of -40°C to +85°C •Supports up to three individually programmable bitsApplication field:The DS1501Y applies to applications involving data logging, instrumentation as well as other time sensitive embedded systems. Its low current consumption and flexible fastening options make it a good fit for low power and light weight applications. In addition, due to its low skew, it is also suitable for the synchronization and coupling of two clock signals.Working Principle:The DS1501Y is an integrated real-time clock and calendar IC. It works by using the frequency output of an external, low frequency crystal and/or a signal input reference as a reference timing source. The DS1501Y also contains an oscillator circuit and time-keeping/calendar logic that uses the timing source to track time and date. The oscillator circuit is integrated with a crystal buffer (for external crystals) and a soft-start feature that enables the clock-calendar registers to be loaded with valid data even if the power supply voltage is changing.The DS1501Y can be operated in one of three modes; I²C Master mode, I²C Slave mode and Synchronous Serial mode. In I²C Master mode, the device is the master on the I²C bus and controls data transfers between itself and any connected slave devices on the bus. In I²C Slave mode, it is in a passive role as it responds to the commands of the master. In Synchronous Serial mode, the device transfers data over three open-collector pins (SDA, SCL, and INT).In summary, the Maxim Integrated DS1501Y is a high-precision real-time clock and calendar IC suitable for low power and light weight applications. Its low power consumption and integrated components enable it to maintain system accuracy and consume far less energy than other available devices. Its flexible fastening options, accuracy, and three distinct operating modes make it a great choice for applications requiring precise timing and date tracking.

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