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DS1338, DS1338C, DS1338U, DS1338Z
I²C RTC with 56-Byte NV RAM
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Status
| Part Number |
Status |
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DS1338
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Active: In Production. |
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DS1338C
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Active: In Production. See Ordering Information for details. |
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DS1338U
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Active: In Production. See Ordering Information for details. |
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DS1338Z
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Active: In Production. |
Description
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.
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Data Sheet
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Key Features
- RTC Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
- Available in a Surface-Mount Package with an Integrated Crystal (DS1338C)
- 56-Byte Battery-Backed General-Purpose RAM with Unlimited Writes
- I²C Serial Interface
- Programmable Square-Wave Output Signal
- Automatic Power-Fail Detect and Switch Circuitry
- -40°C to +85°C Operating Temperature Range
- Underwriters Laboratories (UL) Recognized
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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)
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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Time Keeping Current
(nA) |
CL
(pF) |
Memory Type |
Memory Size
(Bytes) |
Time of Day Alarms |
Budgetary Price |
| hh = sec/100 |
typ |
See Notes |
| DS1338 |
YY-MM-DD/ HH:MM:SS |
I2C |
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800 |
12.5 |
NV SRAM |
56 |
0 |
$1.12 @1k |
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See All Timekeeping & Real-Time Clocks (87)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-6019
Rev 9;
2012-03-06
This page last modified: 2012-03-06
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