DS1338C, DS1338U, DS1338Z：I²C RTC with 56-Byte NV RAM

The DS1338 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially through an I²C 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. The DS1338 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time and date operation.

Key Features

Completely Manages All Timekeeping Functions
- RTC Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
- 56-Byte, Battery-Backed, General- Purpose RAM with Unlimited Writes
- Programmable Square-Wave Output Signal
Surface-Mount Package with an Integrated Crystal (DS1338C) Saves Additional Space and Simplifies Design
Interfaces with Most Microcontrollers
- I2C Serial Interface
Low-Power Operation Extends Battery Backup Run Time
- Automatic Power-Fail Detect and Switch Circuitry
-40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications
Underwriters Laboratories (UL®) Recognized

DS1338, DS1338C, DS1338U, DS1338Z: Block Diagram

Applications/Uses

Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
Handhelds (GPS, POS Terminal)
Medical (Glucometer, Medicine Dispenser)
Office Equipment (Fax/Printer, Copier)
Other (Utility Meter, Vending Machine, Thermostat, Modem)
Telecommunications (Router, Switcher, Server)

DataSheet

title	Download file
DS1338-DS1338Z Data Sheet	DS1338-DS1338Z.pdf

Parametrics

Part Number	Interface	V_SUPPLY (V)	Time Keeping Current (nA)	C_L (pF)	Memory Type	Memory Size (Bytes)	Time of Day Alarms	Integrated Resonator	Functions	Package/Pins	Budgetary Price
Part Number	Interface	V_SUPPLY (V)	typ	C_L (pF)	Memory Type	Memory Size (Bytes)	Time of Day Alarms	Integrated Resonator	Functions	Package/Pins	See Notes
DS1338	I2C	1.8 3 3.3 5	800	12.5	NV SRAM	56	0	-	RTC	µMAX/8 SOIC/16 SOIC(N)/8	$1.50 @1k
DS1338C	I2C	1.8 3 3.3 5	800	12.5	NV SRAM	56	0	XTAL	RTC	µMAX/8 SOIC/16 SOIC(N)/8	$2.71 @1k

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
DS1338C-18	No Longer Available	DS1338C-18#	SOIC,;16 pin;SOIC;16 pin	-40°C to +85°C	No
DS1338C-18#	Active		SOIC,;16 pin;SOIC (;16 pin	-40°C to +85°C
DS1338C-3	No Longer Available	DS1338C-3#	SOIC,;16 pin;SOIC;	-40°C to +85°C	No
DS1338C-3#	Active		SOIC,;16 pin;SOIC (;16 pin	-40°C to +85°C
DS1338C-33	No Longer Available	DS1338C-33#	SOIC,;16 pin;SOIC (;16 pin	-40°C to +85°C	No
DS1338C-33#	Active		SOIC,;16 pin;SOIC (;16 pin	-40°C to +85°C
DS1338C-33#T&R	Active		SOIC,;16 pin;SOIC (;16 pin	-40°C to +85°C

DS1338-DS1338Z.pdf DS1338C