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M48T251Y View Datasheet(PDF) - STMicroelectronics

Part Name
Description
MFG CO.
'M48T251Y' PDF : 24 Pages View PDF
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M48T251Y, M48T251V
SUMMARY DESCRIPTION
The M48T251Y/V TIMEKEEPER® RAM is a
512Kbit x 8 non-volatile static RAM and real time
clock organized as 524,288 words by 8 bits. The
special DIP package provides a fully integrated
battery back-up memory and real time clock solu-
tion. 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 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 M48T251Y/V is a 32-pin (PM) DIP module
that integrates the RTC, the battery, and SRAM in
one package.
The modules are shipped in plastic, anti-static
tubes (see Table 14., page 22).
Figure 2. Logic Diagram
VCC
A0-A18
WE
CE
OE
RST
M48T251Y
M48T251V
DQ0-D7
Table 1. Signal Names
A0–A18
Address Input
RST
Reset Input
CE
Chip Enable
OE
Output Enable Input
WE
WRITE Enable Input
DQ0–DQ7
Data Inputs/Outputs
VCC
Supply Voltage Input
VSS
Ground
VSS
AI04237
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