DS1340Z-33 +T & R Real Time Clock IC RTC With Trickle Charger

DS1340Z-33+T&R Real Time Clock I C RTC with Trickle Charger DRV5032FBDBZR DRV8601ZQVR DS0321SR25MHZ DS1302S+ DS1302SN DS1340 I2 C RTC with Trickle Charger

General Description
The DS1340 is a real-time clock (RTC)/calendar that is pin compatible and functionally equivalent to the ST M41T00, including the software clock calibration. The device additionally provides trickle-charge capability on the V BACKUP pin, a lower timekeeping voltage, and an oscillator STOP flag. Block access of the register map is identical to the ST device. Two additional regis- ters, which are accessed individually, are required for the trickle charger and flag. The clock/calendar pro- vides seconds, minutes, hours, day, date, month, and year information. A built-in power-sense circuit detects power failures and automatically switches to the back- up supply. Reads and writes are inhibited while the clock continues to run. The device is programmed seri- ally through an I2C bidirectional bus.

Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications

Benefits and Features
• Enhanced Second Source for the ST M41T00
• Completely Manages All Timekeeping Functions
• RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
• Software Clock Calibration
• Oscillator Stop Flag
• Low-Power Operation Extends Battery Backup Run
Time
• Low Timekeeping Voltage Down to 1.3V
• Automatic Power-Fail Detect and Switch Circuitry
• Trickle-Charge Capability
• Three Operating Voltage Ranges (1.8V, 3V, and 3.3V)
Supports Systems Using Legacy and Modern Power
Buses
• Surface-Mount Package with an Integrated Crystal
(DS1340C) Saves Additional Space and Simplifies
Design
• Simple Serial Port Interfaces with Most Microcontrollers
• Fast (400kHz) I2 C Interface
• 8-Pin μSOP or SO Package Minimizes Required
Space
• Underwriters Laboratories (UL ®) Recognized

Ordering Information

DS1340C-18# DS1340C-3# DS1340C-33# DS1340C-33#T&R DS1340U-18+ DS1340U-3+ DS1340U-3+T&R
DS1340U-33+T&R DS1340Z-18+ DS1340Z-3+ DS1340Z-3+T&R DS1340Z-33+T&R DS1340U-33+ DS1340Z-33+

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