M48T35 查看數據表（PDF） - STMicroelectronics

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M48T35

5V, 256 Kbit (32 Kb x8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T35

M48T35Y

5V, 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

■ FREQUENCY TEST OUTPUT FOR REAL

TIME CLOCK

■ AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

■ WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

– M48T35: VCC = 4.75 to 5.5V

4.5V ≤ VPFD ≤ 4.75V

– M48T35Y: VCC = 4.5 to 5.5V

4.2V ≤ VPFD ≤ 4.5V

■ 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 32 Kb x 8 SRAMs

■ RoHS COMPLIANCE

Lead-free components are compliant with the

RoHS Directive.

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)

December 2005

Rev 6.0

1/26

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