M48T35AV 查看數據表（PDF） - STMicroelectronics

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M48T35AV

5.0 or 3.3V, 256 Kbit (32 Kb x8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T35AY

M48T35AV

5.0 or 3.3V, 256 Kbit (32 Kb x8) TIMEKEEPER® SRAM

FEATURES SUMMARY

■ INTEGRATED, ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL

CONTROL CIRCUIT AND BATTERY

■ BYTEWIDE™ RAM-LIKE CLOCK ACCESS

■ BCD CODED YEAR, MONTH, DAY, DATE,

HOURS, MINUTES, AND SECONDS

■ BATTERY LOW FLAG (BOK)

■ FREQUENCY TEST OUTPUT FOR REAL

TIME CLOCK

■ AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

■ WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

– M48T35AY: VCC = 4.5 to 5.5V

4.2V ≤ VPFD ≤ 4.5V

– M48T35AV: VCC = 3.0 to 3.6V

2.7V ≤ VPFD ≤ 3.0V

■ SELF-CONTAINED BATTERY AND

CRYSTAL IN THE CAPHAT™ DIP

PACKAGE

■ SOIC PACKAGE PROVIDES DIRECT

CONNECTION FOR A SNAPHAT®

HOUSING CONTAINING THE BATTERY

AND CRYSTAL

■ SNAPHAT® HOUSING (BATTERY AND

CRYSTAL) IS REPLACEABLE

■ PIN AND FUNCTION COMPATIBLE WITH

JEDEC STANDARD 32Kb x8 SRAMs

Figure 1. 28-pin, PCDIP CAPHAT™ Package

28

1

PCDIP28 (PC)

Battery/Crystal

CAPHAT

Figure 2. 28-pin SOIC Package

SNAPHAT (SH)

Battery/Crystal

28

1

SOH28 (MH)

April 2004

1/25

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