64 Kbit的是8K ×8 TIMEKEEPER SRAM 64 Kbit 8Kb x 8 TIMEKEEPER SRAM
SUMMARY DESCRIPTION
The M48T08/18/08Y TIMEKEEPER® RAM is an 8K x 8 non-volatile static RAM and real time clock which is pin and functional compatible with the DS1643. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.
FEATURES SUMMARY
■ INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, AND BATTERY
■ BYTEWIDE™ RAM-LIKE CLOCK ACCESS
■ BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS
■ TYPICAL CLOCK ACCURACY OF ±1 MINUTE A MONTH, AT 25°C
■ AUTOMATIC POWER-FAIL CHIP DESELECT AND WRITE PROTECTION
■ WRITE PROTECT VOLTAGES VPFD= Power-fail Deselect Voltage:
– M48T08: VCC= 4.75 to 5.5V 4.5V ≤VPFD ≤4.75V
– M48T18/T08Y: VCC= 4.5 to 5.5V 4.2V≤VPFD ≤4.5V
■ SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS
■ SELF-CONTAINED BATTERY AND CRYSTAL IN THE CAPHAT™ DIP PACKAGE
■ PACKAGING INCLUDES A 28-LEAD SOIC AND SNAPHAT® TOP to be ordered separately
■ SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT TOP WHICH CONTAINS THE BATTERY AND CRYSTAL
■ PIN AND FUNCTION COMPATIBLE WITH
DS1643 and JEDEC STANDARD 8K x 8 SRAMs
■ RoHS COMPLIANCE
Lead-free components are compliant with the RoHS Directive.
