M48T35Y

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Design Win

5 V, 256 Kbit (32 Kb x 8) TIMEKEEPER® SRAM

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Product overview

Description

The M48T35/Y TIMEKEEPER®RAM is a 32 Kb x 8 non-volatile static RAM and real-time clock. The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory and real-time clock solution. The M48T35/Y is a non-volatile pin and function equivalent to any JEDEC standard 32 Kb x 8 SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed.
The 28-pin, 600 mil DIP CAPHAThouses the M48T35/Y silicon with a quartz crystal and a long life lithium button cell in a single package.
The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct connection to a separate SNAPHAT®housing containing the battery and crystal. The unique design allows the SNAPHAT battery package to be mounted on top of the SOIC package after the completion of the surface mount process. Insertion of the SNAPHAT housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface-mounting. The SNAPHAT housing is keyed to prevent reverse insertion. The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in tape & reel form.
For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part number is “M4T28-BR12SH”.
  • All features

    • Integrated, ultra low power SRAM, real-time clock, power-fail control circuit and battery
    • BYTEWIDERAM-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 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
      • M48T35Y: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
    • Self-contained battery and crystal in the CAPHATDIP 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 compliant
      • Lead-free second level interconnect

Circuit Diagram

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STMicroelectronics - M48T35Y

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T35Y-70MH1F
Active
SO-28 Industrial Ecopack1 (*)
M48T35Y-70PC1
Active
PDIP 28 .7 Industrial Ecopack1

M48T35Y-70MH1F

Package:

SO-28

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-28

Grade

Industrial

RoHS Compliance Grade

Ecopack1 (*)

M48T35Y-70PC1

Package:

PDIP 28 .7

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 28 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

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Part Number
Order from distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
M48T35Y-70PC1 Available at 5 distributors

Distributor availability ofM48T35Y-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 541 1 Buy from Distributor
RS COMPONENTS EUROPE 1199 1 Buy from Distributor
MOUSER WORLDWIDE 14 1 Buy from Distributor
Farnell Element14 EUROPE 8 1 Buy from Distributor
ANGLIA Live EUROPE 547 1 Buy from Distributor

Distributor reported inventory date: 2022-08-02

Distributor Name

DIGIKEY

Stock

541

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1199

Min.Order

1

MOUSER

Stock

14

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

8

Min.Order

1

ANGLIA Live

Stock

547

Min.Order

1

Distributor reported inventory date: 2022-08-02

Active
EAR99 NEC Tube PDIP 28 .7 0 70 MALAYSIA
M48T35Y-70MH1F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel SO-28 0 70 MALAYSIA

M48T35Y-70PC1 Active

Package:
PDIP 28 .7
ECCN (US):
EAR99

Part Number:

M48T35Y-70PC1

ECCN (EU):

NEC

Packing Type:

Tube

Operating Temperature (°C)

Min:

0

Max:

70

Country of Origin:

MALAYSIA

Distributor availability ofM48T35Y-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 541 1 Buy from Distributor
RS COMPONENTS EUROPE 1199 1 Buy from Distributor
MOUSER WORLDWIDE 14 1 Buy from Distributor
Farnell Element14 EUROPE 8 1 Buy from Distributor
ANGLIA Live EUROPE 547 1 Buy from Distributor

Distributor reported inventory date: 2022-08-02

Distributor Name

DIGIKEY

Stock

541

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1199

Min.Order

1

MOUSER

Stock

14

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

8

Min.Order

1

ANGLIA Live

Stock

547

Min.Order

1

Distributor reported inventory date: 2022-08-02

M48T35Y-70MH1F Active

Package:
SO-28
ECCN (US):
EAR99

Part Number:

M48T35Y-70MH1F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

0

Max:

70

Country of Origin:

MALAYSIA

No availability of distributors reported, please contact our sales office
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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors