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DS12887
+Lista de MateriaisIC RTC CLK/CALENDAR PAR 24EDIP
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FabricanteAnalog Devices Inc./Maxim Integrated
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Peça do Fabricante #DS12887
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Especificações
| Atributo | Valor |
| PartStatus | Obsolete |
| DigiKeyProgrammable | Not Verified |
| Type | Clock/Calendar |
| Features | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output |
| MemorySize | 114B |
| TimeFormat | HH:MM:SS (12/24 hr) |
| DateFormat | YY-MM-DD-dd |
| Interface | Parallel |
| Voltage-Supply | 4.5V ~ 5.5V |
| Voltage-Supply,Battery | 2.5V ~ 4V |
| Current-Timekeeping(Max) | 15mA @ 4.5V ~ 5.5V |
| OperatingTemperature | 0°C ~ 70°C |
| MountingType | Through Hole |
| Package/Case | 24-DIP Module (0.600", 15.24mm) |
| SupplierDevicePackage | 24-EDIP |
| BaseProductNumber | DS12887 |
Visão Geral
Description
Equivalent
Features
- Real-time clock/calendar with seconds, minutes, hours, day, date, month, year; 24/12-hour option and leap-year correction; uses a 32.768 kHz time base.
- Alarm capability: two programmable alarms with mask bits.
- Programmable periodic interrupt via RTC timer (rates selectable).
- 64 bytes of battery-backed NV RAM (nonvolatile RAM) for user data.
- VBAT backup with automatic switchover; optional trickle-charge circuit to recharge the backup source from VCC.
- NMI/IRQ support: RTC can generate interrupts; on PC systems IRQ8 and optional NMI via the 0x70/0x71 I/O interface.
- PC-compatible I/O interface: registers accessed through ports 0x70 (address) and 0x71 (data) with NMI control bit.
- Time/date registers in BCD (with a century bit/flag for extended year handling).
- Low-power operation suitable for battery-backed operation.
Pinout
- Function: Real-Time Clock/Calendar with battery-backed nonvolatile RAM (CMOS RAM). Provides timekeeping (seconds, minutes, hours, day/date/month/year) plus storage for BIOS/CMOS data that remains powered by VBAT.
Manufacturer
- What kind of company: A U.S. semiconductor company that designs and manufactures integrated circuits (ICs). It was acquired by Maxim Integrated in 2001, so the DS12887 lineage is now part of Maxim.
Application
- PC motherboard CMOS/BIOS timekeeping and configuration RAM
- Embedded systems needing persistent time and data retention
- Data loggers, instrumentation, and industrial controllers (timestamping and event logging)
- Telecom equipment for timing, alarms, and event counters
- Point-of-sale terminals and kiosks requiring persistent settings and logs
It maintains clock time when power is off and stores critical configuration/data in nonvolatile memory.
Package
Frequently Asked Questions
Q: What is the operating voltage range for the DS12887?
A: The supply voltage is 4.5V to 5.5V; the battery backup voltage range is 2.5V to 4V.
Q: Does the DS12887 support leap year and daylight saving time?
A: Yes, it features automatic leap year compensation and daylight saving time adjustments.
Q: What is the memory capacity of the NVSRAM inside this device?
A: It includes 114 bytes of non-volatile static RAM (NVSRAM) for data storage.
Q: What time format is supported by the DS12887?
A: It supports both 12-hour and 24-hour formats with HH:MM:SS resolution.
Q: What is the maximum current consumption during timekeeping?
A: The maximum timekeeping current is 15mA at 4.5V to 5.5V supply.
Q: Is this component surface mount or through-hole?
A: It is a through-hole device in a 24-pin DIP module (0.600" width).
Q: What is the operating temperature range for the DS12887?
A: The operating temperature range is 0°C to 70°C (commercial grade).
