DS1305EN+T&R by Analog Devices

Serial Alarm Real-Time Clock

Status: Active
Series: DS1305
RoHS: Unknown
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The DS1305 serial alarm real-time clock provides a full binary coded decimal (BCD) clock calendar that is accessed by a simple serial interface. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. In addition, 96 bytes of NV RAM are provided for data storage. The DS1305 will maintain the time and date, provided the oscillator is enabled, as long as at least one supply is at a valid level. An interface logic power-supply input pin (VCCIF) allows the DS1305 to drive SDO and active-low PF pins to a level that is compatible with the interface logic. This allows an easy interface to 3V logic in mixed supply systems. The DS1305 offers dual-power supplies as well as a battery input pin. The dual power supplies support a programmable trickle charge circuit that allows a rechargeable energy source (such as a super cap or rechargeable battery) to be used for a backup supply. The VBAT pin allows the device to be backed up by a non-rechargeable battery. The DS1305 is fully operational from 2.0V to 5.5V. Two programmable time-of-day alarms are provided by the DS1305. Each alarm can generate an interrupt on a programmable combination of seconds, minutes, hours, and day. "Don't care" states can be inserted into one or more fields if it is desired for them to be ignored for the alarm condition. The time-of-day alarms can be programmed to assert two different interrupt outputs or to assert one common interrupt output. Both interrupt outputs operate when the device is powered by VCC1, VCC2, or VBAT. The DS1305 supports direct serial peripheral interface SPI™ to serial data ports or standard 3-wire interface. A straightforward address and data format is implemented in which data transfers can occur 1 byte at a time or in multiple-byte-Burst Mode®.

Prices starting from US$3.86


Distributor Starting From Stock
Logo for element14 element14 US$4.19
11,087
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Logo for Transfer Multisort Elektronik Transfer Multisort Elektronik US$4.57
465
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Logo for Newark Electronics Newark Electronics US$4.22
-
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Features

Completely Manages All Timekeeping Functions Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 96-Byte, Battery-Backed NV RAM for Data Storage Two Time-Of-Day Alarms, Programmable on Combination of Seconds, Minutes, Hours, and Day of the Week
Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
96-Byte, Battery-Backed NV RAM for Data Storage
Two Time-Of-Day Alarms, Programmable on Combination of Seconds, Minutes, Hours, and Day of the Week
Standard Serial Port Interfaces with Most Microcontrollers Supports SPI (Serial Peripheral Interface) Modes 1 and 3 or Standard 3-Wire Interface Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
Supports SPI (Serial Peripheral Interface) Modes 1 and 3 or Standard 3-Wire Interface
Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
Multiple Power Supply Pins Ease Adding Battery For Backup Dual-Power Supply Pins for Primary and Backup Power Supplies Optional Trickle Charge Output to Backup Supply 2.0V to 5.5V Operation
Dual-Power Supply Pins for Primary and Backup Power Supplies
Optional Trickle Charge Output to Backup Supply
2.0V to 5.5V Operation
20-Pin TSSOP Minimizes Required Space
Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications
Underwriters Laboratory (UL®) Recognized

Specifications

Interface 3-WireSPI
VSUPPLY (V) 2 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 450
CL (pF) 6
Memory Type NV SRAM
Memory Size (Bytes) 96
Time of Day Alarms 2
Package/Pins PDIP/16TSSOP/20
BudgetaryPrice (See Notes) 2.76


DS1305EN+T&R Semiconductors - ICs by Analog Devices

RTC W/ NVRAM 768B HH:MM:SS TSSOP-20

Status: Unknown
Series: -
RoHS: Unknown
View Datasheet Manufacturer Site View Pricing & Stock

Specifications

Date Format Day
Clock Format HH
Clock IC Type Alarm RTC
Supply Voltage Min 2V
Supply Voltage Max 5.5V
Clock IC Case Style TSSOP
No. of Pins 20Pins
IC Interface Type SPI
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

RTC W/ NVRAM, 768B, HH:MM:SS, TSSOP-20 | element14
RTC W/ NVRAM, 768B, HH: MM: SS, TSSOP-20 | Farnell
IC: RTC circuit | Transfer Multisort Elektronik
Rtc W/ Nvram, 768B, Hh:Mm:Ss, Tssop-20 | Newark Electronics

Frequently Asked Questions

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Is the DS1305EN+T&R RoHS compliant?

This part has not been flagged as RoHS Compliant.

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