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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M48T254V датащи(PDF) 3 Page - STMicroelectronics |
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M48T254V датащи(HTML) 3 Page - STMicroelectronics |
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3 / 24 page  3/24 M48T254V SUMMARY DESCRIPTION The M48T254V TIMEKEEPER® RAM is a 2Mbit x 8 non-volatile static RAM and real time clock orga- nized as 2,097,152 words by 8 bits. The special BGA package provides a fully integrated battery back-up memory and real time clock solution. In the event of power instability or absence, a self- contained battery maintains the timekeeping oper- ation and provides power for a CMOS static RAM. Control circuitry monitors VCC and invokes write protection to prevent data corruption in the memo- ry and RTC. The clock keeps track of tenths/hundredths of sec- onds, seconds, minutes, hours, day, date, month, and year information. The last day of the month is automatically adjusted for months with less than 31 days, including leap year correction. The clock operates in one of two formats: – a 12-hour mode with an AM/PM indicator; or – a 24-hour mode The M48T254V is a 168-ball PBGA module that in- tegrates the RTC, the battery, and SRAM in one package. Figure 3. Logic Diagram Table 1. Signal Names AI04217 VCC M48T254V VSS BL A0 – A20 DQ0 – DQ7 WE OE CE A0 - A20 Address Inputs DQ0 - DQ7 Data Input/Output CE Chip Enable WE WRITE Enable Inputs OE Output Enable BL Battery Low Output (Open Drain) NC No Connect VCC Supply Voltage VSS Ground |
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