M48T18

Active

5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM

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CAD Resources
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Quality & Reliability
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Product overview

Description

The M48T08/18/08Y TIMEKEEPER®RAM is an 8 K x 8 non-volatile static RAM and real-time clock which is pin and function compatible with the DS1643. The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory and real-time clock solution. The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard 8 K 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 CAPHAT™ houses the M48T08/18/08Y 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” or “M4T32-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
    • Typical clock accuracy of ±1 minute a month, at 25 °C
    • Automatic power-fail chip deselect and WRITE protection
    • WRITE protect VPFD= power-fail deselect voltage):
      • M48T08: VCC= 4.75 to 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
      • M48T18/T08Y: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
    • Software controlled clock calibration for high accuracy applications
    • 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 top which contains the battery and crystal
    • Pin and function compatible with DS1643 and JEDEC standard 8 K x 8 SRAMs
    • RoHS compliant
      • Lead-free second level interconnect

Circuit Diagram

EDA Symbols, Footprints and 3D Models

STMicroelectronics - M48T18

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T18-100PC1
Active
PDIP 28 .7 Industrial Ecopack1 (*)
M48T18-150PC1
Active
PDIP 28 .7 Industrial Ecopack2 (**)

M48T18-100PC1

Package:

PDIP 28 .7

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 28 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack1 (*)

M48T18-150PC1

Package:

PDIP 28 .7

Material Declaration**:

PDF XML

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
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
M48T18-100PC1 Available at 7 distributors

Distributor availability ofM48T18-100PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 325 1 Buy from Distributor
RS COMPONENTS EUROPE 194 1 Buy from Distributor
AVNET AMERICA 240 0 Buy from Distributor
FUTURE WORLDWIDE 2076 12 Buy from Distributor
Newark Element14 AMERICA 182 0 Buy from Distributor
MOUSER WORLDWIDE 368 1 Buy from Distributor
Farnell Element14 EUROPE 360 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

325

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

194

Min.Order

1

AVNET

Stock

240

Min.Order

0

Region

AMERICA Buy from Distributor

FUTURE

Stock

2076

Min.Order

12

Region

WORLDWIDE Buy from Distributor

Newark Element14

Stock

182

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

368

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

360

Min.Order

1

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tube PDIP 28 .7 0 70 MALAYSIA 15.5199 / 1k
M48T18-150PC1 Available at 6 distributors

Distributor availability ofM48T18-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 443 1 Buy from Distributor
RS COMPONENTS EUROPE 271 1 Buy from Distributor
FUTURE WORLDWIDE 804 12 Buy from Distributor
Newark Element14 AMERICA 8 0 Buy from Distributor
MOUSER WORLDWIDE 126 1 Buy from Distributor
Farnell Element14 EUROPE 225 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

443

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

271

Min.Order

1

FUTURE

Stock

804

Min.Order

12

Region

WORLDWIDE Buy from Distributor

Newark Element14

Stock

8

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

126

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

225

Min.Order

1

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tube PDIP 28 .7 0 70 MALAYSIA

M48T18-100PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T18-100PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 325 1 Buy from Distributor
RS COMPONENTS EUROPE 194 1 Buy from Distributor
AVNET AMERICA 240 0 Buy from Distributor
FUTURE WORLDWIDE 2076 12 Buy from Distributor
Newark Element14 AMERICA 182 0 Buy from Distributor
MOUSER WORLDWIDE 368 1 Buy from Distributor
Farnell Element14 EUROPE 360 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

325

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

194

Min.Order

1

AVNET

Stock

240

Min.Order

0

Region

AMERICA Buy from Distributor

FUTURE

Stock

2076

Min.Order

12

Region

WORLDWIDE Buy from Distributor

Newark Element14

Stock

182

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

368

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

360

Min.Order

1

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 28 .7

Operating Temperature (°C)

(min)

0

(max)

70

Country of Origin

MALAYSIA

M48T18-150PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T18-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 443 1 Buy from Distributor
RS COMPONENTS EUROPE 271 1 Buy from Distributor
FUTURE WORLDWIDE 804 12 Buy from Distributor
Newark Element14 AMERICA 8 0 Buy from Distributor
MOUSER WORLDWIDE 126 1 Buy from Distributor
Farnell Element14 EUROPE 225 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

443

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

271

Min.Order

1

FUTURE

Stock

804

Min.Order

12

Region

WORLDWIDE Buy from Distributor

Newark Element14

Stock

8

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

126

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

225

Min.Order

1

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 28 .7

Operating Temperature (°C)

(min)

0

(max)

70

Country of Origin

MALAYSIA

(*) 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