Product overview
Description
The M48T35AV TIMEKEEPER®RAM is a 32 Kbit 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 M48T35AV 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 CAPHAT™houses the M48T35AV 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 part numbers are M4T28-BR12SH1 (48 mAh lithium battery SNAPHAT), M4T32-BR12SH1 (120 mAh lithium battery SNAPHAT), and M4T32-BR12SH6 (120 mAh lithium battery SNAPHAT, –40 to +85 °C crystal).
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All 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
- Battery low flag (BOK)
- Frequency test output for real-time clock
- Automatic power-fail chip deselect and WRITE protection
- WRITE protect voltage (VPFD= power-fail deselect voltage):
- M48T35AV: VCC= 3.0 to 3.6 V; 2.7 V ≤ VPFD≤ 3.0 V
- 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 Kbit x 8 SRAMs
- RoHS compliant
- Lead-free second level interconnect
Circuit Diagram
All resources
| Resource title | Version | Latest update |
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Product Specifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 9.1 | 19 Sep 2016 | 19 Sep 2016 |
Application Notes (5 of 8)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 4.0 | 15 Feb 2015 | 15 Feb 2015 | ||
| 4.1 | 31 Oct 2024 | 31 Oct 2024 | ||
| 4.0 | 31 Oct 2024 | 31 Oct 2024 | ||
| 2.0 | 29 Sep 2016 | 29 Sep 2016 | ||
| 4.1 | 10 Oct 2022 | 10 Oct 2022 | ||
| 2.1 | 31 Oct 2024 | 31 Oct 2024 | ||
| 2.0 | 13 Sep 2018 | 13 Sep 2018 | ||
| 2.0 | 13 Sep 2018 | 13 Sep 2018 |
Product Certifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 2.1 | 01 Aug 2015 | 01 Aug 2015 |
EDA Symbols, Footprints and 3D Models
STMicroelectronics - M48T35AV
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Symbols
Footprints
3D models
All resources
| Resource title | Version | Latest update |
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IBIS models (2)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| ZIP | 1.0 | 01 Aug 2015 | 01 Aug 2015 | |
| ZIP | 1.0 | 01 Aug 2015 | 01 Aug 2015 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| M48T35AV-10MH1F | Active | SOH28 | Industrial | Ecopack3 | |
| M48T35AV-10PC1 | Active | PDIP 28 .7 | Industrial | 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 | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||
| M48T35AV-10MH1F | Active | 11.8888 / 1k | 3 distributors | SOH28 | Tape and Reel | MALAYSIA | EAR99 | NEC | 0 | 70 | ||||
| M48T35AV-10PC1 | Active | 18.197 / 1k | 2 distributors | PDIP 28 .7 | Tube | MALAYSIA | EAR99 | NEC | 0 | 70 | ||||
M48T35AV-10MH1F Active
M48T35AV-10PC1 Active
(*) 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