Product Details
For all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. It also operates in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. A lithium coin cell battery can be connected to the VBAT input pin on the DS17x85 to maintain time and date operation when primary power is absent. The DS17x85 and DS17x87 include a VBAUX input used to power auxiliary functions such as active-low PWR control. The device is accessed through a multiplexed byte-wide interface.
Key Features
- Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
- RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
- Optional +3.0V or +5.0V Operation
- SMI Recovery Stack
- 64-Bit Silicon Serial Number
- Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
- Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
- 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
- 114 Bytes of General-Purpose, Battery-Backed NV SRAM
- Extended Battery-Backed NV SRAM
- 2048 Bytes (DS17285/DS17287)
- 4096 Bytes (DS17485/DS17487)
- 8192 Bytes (DS17885/DS17887)
- RAM Clear Function
- Interrupt Output with Six Independently Maskable Interrupt Flags
- Time-of-Day Alarm Once per Second to Once per Day
- End of Clock Update Cycle Flag
- Programmable Square-Wave Output
- Automatic Power-Fail Detect and Switch Circuitry
- Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
- Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
- Optional Industrial Temperature Range Available
Applications/Uses
- Embedded Systems
- Network Hubs, Bridges, and Routers
- Security Systems
- Utility Meters
Interface | Multiplexed |
VSUPPLY (V) | 3 5 |
Date/ Time Format (hh = sec/100) | YYYY-MM-DD/ HH:MM:SS |
Time Keeping Current (nA) (typ) | - |
CL (pF) | - |
Memory Type | NV SRAM |
Memory Size (Bytes) | 4K |
Time of Day Alarms | 1 |
Package/Pins | MOD/24 |
Budgetary Price (See Notes) | $9.69 @1k |
Technical Docs
Click any title below to view the detail page where available.
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
Parameters
Interface | Multiplexed |
VSUPPLY (V) | 3 5 |
Date/ Time Format (hh = sec/100) | YYYY-MM-DD/ HH:MM:SS |
Time Keeping Current (nA) (typ) | - |
CL (pF) | - |
Memory Type | NV SRAM |
Memory Size (Bytes) | 4K |
Time of Day Alarms | 1 |
Package/Pins | MOD/24 |
Budgetary Price (See Notes) | $9.69 @1k |
Key Features
- Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
- RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
- Optional +3.0V or +5.0V Operation
- SMI Recovery Stack
- 64-Bit Silicon Serial Number
- Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
- Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
- 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
- 114 Bytes of General-Purpose, Battery-Backed NV SRAM
- Extended Battery-Backed NV SRAM
- 2048 Bytes (DS17285/DS17287)
- 4096 Bytes (DS17485/DS17487)
- 8192 Bytes (DS17885/DS17887)
- RAM Clear Function
- Interrupt Output with Six Independently Maskable Interrupt Flags
- Time-of-Day Alarm Once per Second to Once per Day
- End of Clock Update Cycle Flag
- Programmable Square-Wave Output
- Automatic Power-Fail Detect and Switch Circuitry
- Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
- Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
- Optional Industrial Temperature Range Available
Applications/Uses
- Embedded Systems
- Network Hubs, Bridges, and Routers
- Security Systems
- Utility Meters
Description
For all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. It also operates in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. A lithium coin cell battery can be connected to the VBAT input pin on the DS17x85 to maintain time and date operation when primary power is absent. The DS17x85 and DS17x87 include a VBAUX input used to power auxiliary functions such as active-low PWR control. The device is accessed through a multiplexed byte-wide interface.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal