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MFG:ST Package Cooled:DIP D/C:06/
Part Number: M48T35
MFG: ST
Package Cooled: DIP
D/C: 06/
Description: The M48T35/Y TIMEKEEPER® RAM is a 32Kb x 8 non-volatile static RAM and real time clock....
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M48T35
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DataSheet
General Description
M48T35 General Description
The M48T35/Y TIMEKEEPER® RAM is a 32Kb 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-up memory and real time clock solution.
The M48T35/Y is a non-volatile pin and function equivalent to any JEDEC standard 32Kb 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, 600mil DIP CAPHAT houses the M48T35/Y silicon with a quartz crystal and a long life lithium button cell in a single package.
The 28-pin, 330mil 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 surfacemounting. The SNAPHAT housing is keyed to prevent reverse insertion. The SOIC and battery/crystal packages are shipped separately in plastic antistatic tubes or in Tape & Reel form.
For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part number is "M4T28- BR12SH" (see Table 18, page 23).
M48T35 Maximum Ratings
| Symbol | Parameter |
Value |
Units | |
| TA | Ambient Operating Temperature | Grade 1 |
0 to 70 |
|
| Grade 6 |
40 to 85 |
|||
| TSTG | Storage Temperature (VCC Off, Oscillator Off) |
40 to 85 |
||
| TSLD(1,2) | Lead Solder Temperature for 10 seconds |
260 |
||
| VIO | Input or Output Voltages | M48T35 |
0.3 to 7 |
V |
| M48T35Y |
0.3 to 7 |
V | ||
| VCC | Supply Voltaget | M48T35 |
0.3 to 7 |
V |
| M48T35Y |
0.3 to 7 |
V | ||
| IO | Output Current |
20 |
mA | |
| PD | Power Dissipation |
0 |
W | |
Note: 1. For DIP package: Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds).
2. For SO package: Reflow at peak temperature of 215°C to 225°C for < 60 seconds (total thermal budget not to exceed 180°C for between 90 to 120 seconds).
CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode.
CAUTION: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
M48T35 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
` 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 5.5V
4.5V VPFD 4.75V
M48T35Y: VCC = 4.5 to 5.5V
4.2V VPFD 4.5V
` SELF-CONTAINED BATTERY AND CRYSTAL IN THE CAPHAT™ DIP PACKAGE
` SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT® HOUSING CONTAINING THE BATTERY ND CRYSTAL
` SNAPHAT® HOUSING (BATTERY AND CRYSTAL) IS REPLACEABLE
` PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD 32 Kb x 8 SRAMs
` BYTEWIDE™ RAM-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 5.5V
4.5V VPFD 4.75V
M48T35Y: VCC = 4.5 to 5.5V
4.2V VPFD 4.5V
` SELF-CONTAINED BATTERY AND CRYSTAL IN THE CAPHAT™ DIP PACKAGE
` SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT® HOUSING CONTAINING THE BATTERY ND CRYSTAL
` SNAPHAT® HOUSING (BATTERY AND CRYSTAL) IS REPLACEABLE
` PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD 32 Kb x 8 SRAMs
M48T35 Connection Diagram
M48T35
PDF/DataSheet Download
- Datasheet: M48T35
- File Size: 145770 KB
- Manufacturer: STMICROELECTRONICS [STMicroelectronics]
- Click here to Download
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