M440T513Y datasheet(4/26 Pages) STMICROELECTRONICS

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M440T513Y

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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

IRQ

RSV2

RSV1

A0 – A18

DQ0 – DQ31

DQC0 – DQC7

W1 – W4

E1 – E4

A0 - A18

Address Inputs

DQ0 - DQ31

NVRAM Data Input/Output

DQC0 - DQC7

Clock Data Input/Output

E1 - E4

NVRAM Chip Enable Inputs

Clock Chip Enable Input

W1 - W4

NVRAM WRITE Enable Inputs

Clock WRITE Enable Input

Output Enable Input

Clock Output Enable Input

Battery Low Output (Open

Drain)

IRQ

Interrupt Output (Open Drain)

RSV1

Reserved

RSV2

Reserved

No Connect

VCC

Supply Voltage

VSS

Ground

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