M48T254V datasheet(1/24 Pages) STMICROELECTRONICS

Part #	M48T254V

Description	CLOCK FUNCTION IS TRANSPARENT TO RAM OPERATION.

PDF	24 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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May 2003

Rev. 2.0

M48T254V

3.3V, 16 Mbit (2 Mb x 8 bit) TIMEKEEPER®

SRAM WITH PHANTOM CLOCK

FEATURES SUMMARY

s

3.3V ± 10%

s

INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL CONTROL

CIRCUIT, BATTERY AND CRYSTAL

s

REAL TIME CLOCK KEEPS TRACK OF

TENTHS/HUNDREDTHS OF SECONDS,

SECONDS, MINUTES, HOURS, DAYS, DATE,

MONTHS, and YEARS.

s

CLOCK FUNCTION IS TRANSPARENT TO

RAM OPERATION.

s

PRECISION POWER MONITORING and

POWER SWITCHING CIRCUITRY

s

AUTOMATIC WRITE-PROTECTION WHEN

VCC IS OUT-OF-TOLERANCE

s

POWER-FAIL DESELECT VOLTAGE:

–VCC = 3.3V ± 10%; 2.8V ≤ VPFD ≤ 2.97V

s

BATTERY LOW (BL)

s

10 YEARS of DATA RETENTION and CLOCK

OPERATION IN THE ABSENCE OF POWER

s

SNAPHAT HOUSING (BATTERY/CRYSTAL)

IS REPLACEABLE

s

100ns ACCESS (READ = WRITE)

Figure 1. 168-ball PBGA Module

Figure 2. SNAPHAT Crystal/Battery

168-ball PBGA

Module (ZA)

SNAPHAT (SH)

Crystal/Battery

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M48T254V Datasheet(PDF) 1 Page - STMicroelectronics

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