Real Time Clock Parallel 128KByte 32-Pin PMDIP

The M48T129Y/V TIMEKEEPER RAM is a 128 Kb x 8 non-volatile static RAM and realtime clock with programmable alarms and a watchdog timer. The special DIP package provides a fully integrated battery-backed memory and real-time clock solution. The M48T129Y/V directly replaces industry standard 128 Kb x 8 SRAM. It also provides the nonvolatility of Flash without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed.The 32-pin, 600 mil DIP hybrid houses a controller chip, SRAM, quartz crystal, and a longlife lithium button cell in a single package.

• Integrated, ultra low power SRAM, real-time clock, power-fail control circuit, battery, and crystal
• BCD coded century, year, month, day, date, hours, minutes, and seconds
• Battery low warning flag
• Automatic power-fail chip deselect and WRITE protection
• Two WRITE protect voltages: (VPFD = power-fail deselect voltage)
  • M48T129Y: VCC = 4.5 to 5.5 V; 4.2 V = VPFD = 4.5 V
  • M48T129V: VCC = 3.0 to 3.6 V; 2.7 V = VPFD = 3.0 V
• Conventional SRAM operation; unlimited WRITE cycles
• Software controlled clock calibration for high accuracy applications
• 10 years of data retention and clock operation in the absence of power
• Self-contained battery and crystal in DIP package
• Microprocessor power-on reset (valid even during battery backup mode)
• Programmable alarm output active in battery backup mode
• RoHS compliant
  • Lead-free second level interconnect