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M440T1MV Datasheet(PDF) 4 Page - STMicroelectronics

Part No. M440T1MV
Description  3.3V, 32 Mbit (1024 Kbit x 32) TIMEKEEPER SRAM
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M440T1MV
4/26
SUMMARY DESCRIPTION
The M440T1MV TIMEKEEPER® RAM is a 16Mbit,
non-volatile static RAM organized as 1,024K 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 memory and real time
clock solution. In the event of power 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 prevent data cor-
ruption 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 M440T1MV is in a 168-ball PBGA module that
integrates the RTC, the battery, and SRAM in one
package.
Figure 2. Logic Diagram
Table 1. Signal Names
AI04200
VCC
M440T1MV
VSS
BL
IRQ
RSV2
RSV1
A0 – A19
DQ0 – DQ31
DQC0 – DQC7
EC
W1 – W4
WC
G
GC
E1 – E4
A0 - A19
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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