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  • The M48T58/Y TIMEKEEPER®RAM is a 8 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 M48T58/Y is a non-volatile pin and function equivalent to any JEDEC standard 8b 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 M48T58/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”.

    Key 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):
      • M48T58: VCC= 4.75 to 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
      • M48T58Y: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
    • Self-contained battery and crystal in the CAPHATDIP package
    • Packaging includes a 28-lead SOIC and SNAPHAT® top (to be ordered separately)
    • SOIC package provides direct connection for a snaphat housing containing the battery and crystal
    • Pin and function compatible with JEDEC standard 8 Kb x 8 SRAMs
    • RoHS compliant
      • Lead-free second level interconnect

Circuit Diagram

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T58-70PC1
Active
PDIP 28 .7 Industrial Ecopack2 (**)

M48T58-70PC1

Package:

PDIP 28 .7

Material Declaration**:

Marketing Status

Active

Package

PDIP 28 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

(**) 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

Part Number
Order from Distributors
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Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
M48T58-70PC1 Available at 5 distributors

Distributor availability ofM48T58-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 266 1 Order Now
RS COMPONENTS EUROPE 26 1 Order Now
ARROW EUROPE 240 0 Order Now
MOUSER WORLDWIDE 103 1 Order Now
Farnell Element14 EUROPE 27 1 Order Now

Distributor reported inventory date: 2020-11-30

Distributor Name

DIGIKEY

Stock

266

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

26

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

240

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

103

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

27

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-30

Buy Direct
Active
EAR99 NEC Tube PDIP 28 .7 0 70 MALAYSIA 12.699 / 1k

M48T58-70PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T58-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 266 1 Order Now
RS COMPONENTS EUROPE 26 1 Order Now
ARROW EUROPE 240 0 Order Now
MOUSER WORLDWIDE 103 1 Order Now
Farnell Element14 EUROPE 27 1 Order Now

Distributor reported inventory date: 2020-11-30

Distributor Name

DIGIKEY

Stock

266

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

26

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

240

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

103

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

27

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-30

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 28 .7

Operating Temperature (°C)

(min)

0

(max)

70

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors