MK48T08

The MK48T08 integrates an 8K*8 full CMOS SRAM, a BYTEWIDE accessible real time clock, a crystal and a long life lithium carbon mono-fluoride battery into a single plastic DIP package. The device is a non-volatile pin and function equivalent to any JEDEC standard 8K*8 SRAM. In addition, the MK48T08 fits into many EPROM and EEPROM sockets which provides the non-volatility of PROMs without any requirement for special write timing, or limitations on the number of writes that can be performed.

There are some features of MK48T08 as follows: (1)integrated ultra low power SRAM, real time clock, crystal, power-fail control circuit and battery; (2)BYTEWIDE RAM-like clock access; (3)BCD coded year, month, day, date, hours, minutes and seconds; (4)software controlled clock calibration for high accuracy applications; (5)10 years of data retention in the absence of power; (6)pin and function compatible with JEDEC standard 8K*8 SRAM; (7)automatic power-fail chip deselect/write protection; (8)choice of two write protect voltages: 4.50VPFD4.75 V.

What comes next is about the absolute maximum ratings of MK48T08: (1)PD, total power dissipation: 1.0 W; (2)IOUT, output current per pin: 20 mA; (3)VDD, voltage on any pin relative to GND: -0.3 to +7.0 V; (4)TA, ambient operating temperature: 0 to 70; (5)Tstg, ambient storage (VCC off, oscillator off) temperature: -40 to 85. Then is about the recommended DC operating conditions (0TA+70): (1)VCC, supply voltage: 4.75 V min and 5.5 V max; (2)GND, supply voltage: 0 V; (3)VIH, logic "1" voltage all inputs: 2.2 V min and VCC+0.3 V max; (4)VIL, logic "0" voltage all inputs: -0.3 V min and 0.8 V max.