DS12C887+ - Dallas DS12C887+ Real Time Clock IC Simple Type: Integrated Circuit...
- Part Number:
- DS12C887+
- Model Number:
- DS12C887+
- Make:
- DALLAS
- Lead Time:
- Available
- Qty In Stock:
- Available
Dallas DS12C887+ Real Time Clock IC Simple Type: Integrated Circuit (IC)
The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are designed to be direct replacements for the DS1285 and DS1287. The devices provide a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM (113 bytes in the DS12C887 and (DS12C887A). The DS12887 integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS12C887 adds a century byte at address 32h. 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. The devices also operate 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 DS12885 to maintain time and date operation when primary power is absent. The device is accessed through a multiplexed byte-wide interface, which sup-ports both Intel and Motorola modes.
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Features
- 114 Bytes of General-Purpose, Battery-Backed
- 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
- 14 Bytes of Clock and Control Registers
- 32-Pin TQFP (DS12885)
- Automatic Power-Fail Detect and Switch Circuitry
- Binary or BCD Time Representation
- Clock/Calendar
- Daylight Saving Time Option
- Drop-In Replacement for IBM AT Computer
- DS12887A, DS12C887, DS12C887A)
- End-of-Clock Update Cycle Flag
- Integrated Crystal and Battery (DS12887,
- Interfaced with Software as 128 RAM Locations
- Interrupt Output with Three Independently
- Maskable Interrupt Flags
- Optional 28-Pin PLCC Surface Mount Package or
- Optional Encapsulated DIP (EDIP) Package with
- Optional Industrial Temperature Range Available
- Periodic Rates from 122µs to 500ms
- Programmable Square-Wave Output
- RAM (113 Bytes in the DS12C887 and DS12C887A)
- RAM Clear Function (DS12885, DS12887A, and DS12C887A)
- RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
- Selectable Intel or Motorola Bus Timing
- Time-of-Day Alarm Once Per Second to Once Per Day
- Underwriters Laboratory (UL) Recognized
Specifications
- I/O Leakage: Min: -1.0, Max: +1.0 µA
- Input Leakage: Min: -1.0, Max: +1.0 µA
- Input Logic 0 VIL: Min: -0.3, Max: +0.8 V
- Input Logic 1: Min: 2.2, Max: VCC+0.3V
- Output at 0.4: V4.0 mA
- Output at 2.4V: Min:-1.0 mA
- Power-Fail Voltage: Min: 4.0, Typ: 4.25, Max: 4.5 V
- Supply Voltage: Min: 4.5, Max: 5.5 V
- VBATInput Voltage: Min: 2.5, Max: 4.0 V
- VCCPower-Supply Current: Max: 15 mA
- VRT Trip Point: 1.3 V
Applications
- None Available
Aliases
- None Available
