-
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”.Key Features
- 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
- 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 CAPHAT™DIP 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
Download 
Sample & Buy
| Part Number | Package | Packing Type | Marketing Status | ECCN (US) | Country of Origin | Approximate Price (US$)* / Qty | Order from ST | Order from Distributors |
|---|---|---|---|---|---|---|---|---|
| M48T08-100PC1 | PDIP 28 .7 | Tube | Active | EAR99 | MALAYSIA | 21.75 | Buy now | Check Availability |
| M48T08-150PC1 | PDIP 28 .7 | Tube | Active | EAR99 | MALAYSIA | 21.75 / 1k | Buy now | Check Availability |
(*) 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
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| M48T08-100PC1 | Active | PDIP 28 .7 | Industrial | Ecopack1 | |
| M48T08-150PC1 | Active | PDIP 28 .7 | Industrial | Ecopack1 | |
M48T08-100PC1
Package:
PDIP 28 .7Material Declaration**:
M48T08-150PC1
Package:
PDIP 28 .7Material Declaration**:
(**) 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.
