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M440T513Y-15ZA9 Datasheet(PDF) 4 Page - STMicroelectronics |
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M440T513Y-15ZA9 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 26 page  M440T513Y 4/26 SUMMARY DESCRIPTION The M440T513Y TIMEKEEPER® RAM is a 16Mbit, non-volatile static RAM organized as 512K by 32 bits and real time clock organized as 64 bytes by 8 bits. The special PBGA package provides a fully integrated battery back-up memo- ry and real time clock solution. In the event of pow- er instability or absence, a self-contained battery maintains the timekeeping operation and provides power for a CMOS static RAM. Control circuitry monitors VCC and invokes write protection to pre- vent data corruption in the memory 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 M440T513Y is a 168-ball PBGA module that integrates the RTC, the battery, and SRAM in one package. Figure 2. Logic Diagram Table 1. Signal Names AI07009 VCC M440T513Y VSS BL IRQ RSV2 RSV1 A0 – A18 DQ0 – DQ31 DQC0 – DQC7 EC W1 – W4 WC G GC E1 – E4 A0 - A18 Address Inputs DQ0 - DQ31 NVRAM Data Input/Output DQC0 - DQC7 Clock Data Input/Output E1 - E4 NVRAM Chip Enable Inputs EC Clock Chip Enable Input W1 - W4 NVRAM WRITE Enable Inputs WC Clock WRITE Enable Input G Output Enable Input GC Clock Output Enable Input BL Battery Low Output (Open Drain) IRQ Interrupt Output (Open Drain) RSV1 Reserved RSV2 Reserved NC No Connect VCC Supply Voltage VSS Ground |
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