DS1556, DS1556P 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

The DS1556 is a full-function, year-2000-compliant (Y2KC), Real-Time Clock calendar (RTC) with an RTC alarm, watchdog Timer power-on reset, Battery Monitor and 128k x 8 nonvolatile static RAM. User access to all Registers within the DS1556 is accomplished with a byte-wide Interface as shown in Figure 1. The RTC Registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically.
The RTC Registers are double-buffered into an internal and external set. The user has direct access to the external set. Clock calendar updates to the external set of Registers CAN be disabled and enabled to allow the user to access static data. Assuming the internal Oscillator is turned on, the internal set of Registers is continuously updated, which occurs regardless of external Registers settings to guarantee that accurate RTC information is always maintained.
The DS1556 has interrupt (active-low IRQ/FT) and reset (active-low RST) outputs which CAN be used to control CPU activity. The active-low IRQ/FT interrupt output CAN be used to generate an external interrupt when the RTC Register values match user programmed alarm values. The interrupt is always available while the device is powered from the system supply and CAN be programmed to occur when in the battery-backed state to serve as a system wake-up. Either the active-low IRQ/FT or active-low RST outputs CAN also be used as a CPU watchdog Timer CPU activity is monitored and an interrupt or reset output will be activated if the correct activity is not detected within programmed limits. The DS1556 power-on reset CAN be used to detect a system power down or failure and hold the CPU in a safe reset state until normal power returns and stabilizes; the active-low RST output is used for this function.
The DS1556 also contains its own power-fail circuitry, which automatically deselects the device when the VCC supply enters an out of tolerance condition. This feature provides a high degree of data security during unpredictable system operation brought on by low VCC levels.
By Maxim Integrated Products
Part Manufacturer Description Datasheet Samples
DS1556-70-W Maxim Integrated Products DS1556-70-W
DS1556WP Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, POWERCAP MODULE-34
DS1556-70IND+ Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, PDMA32, ROHS COMPLIANT, EDIP MODULE-32
DS1556-70+ Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, PDMA32, ROHS COMPLIANT, EDIP MODULE-32
DS1556P-70+ Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, ROHS COMPLIANT, POWERCAP MODULE-34
DS1556WP-120IND+ Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, ROHS COMPLIANT, POWERCAP MODULE-34
DS1556WP-120+ Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, ROHS COMPLIANT, POWERCAP MODULE-34
DS1556W-120 Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, PDMA32, EDIP MODULE-32
DS1556W-120IND Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, PDMA32, EDIP MODULE-32
DS1556P-70IND+ Maxim Integrated Products Real Time Clock, Non-Volatile, CMOS, ROHS COMPLIANT, POWERCAP MODULE-34
DS1556 's PackagesDS1556 's pdf datasheet
DS1556-70
DS1556W-120
DS1556W-120IND
DS1556-70IND
DS1556WP-120
DS1556WP-120IND
DS1556P-70
DS1556P-70IND




DS1556 Pinout, Pinouts
DS1556 pinout,Pin out
This is one package pinout of DS1556,If you need more pinouts please download DS1556's pdf datasheet.

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