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Part Number: M48T128Y
Description: The M48T128Y/V TIMEKEEPER® RAM is a 128Kb x 8 non-volatile static RAM and real time clo...
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M48T128Y
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DataSheet
General Description
M48T128Y General Description
The M48T128Y/V TIMEKEEPER® RAM is a 128Kb x 8 non-volatile static RAM and real time clock. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The M48T128Y/V directly replaces industry standard 128Kb x 8 SRAM.
It also provides the non-volatility of Flash without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed. The 32-pin, 600mil DIP Hybrid houses a controller chip, SRAM, quartz crystal, and a long life lithium button cell in a single package.
M48T128Y Maximum Ratings
| Symbol | Parameter |
Value |
Unit | |
| TA | Ambient Operating Temperature |
0 to 70 |
||
| TSTG | Storage Temperature (VCC Off, Oscillator Off) |
40 to 85 |
||
| TSLD (2) | Lead Solder Temperature for 10 seconds |
260 |
||
| VIO | Input or Output Voltages |
0.3 to 7 |
V | |
| VCC | Supply Voltage | M48T128Y |
0.3 to 7 |
V |
| M48T128V | 0.3 to 4.6 |
V | ||
| IO | Output Current |
20 |
mA | |
| PD | Power Dissipation |
1 |
W | |
Note: 1. Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds). No preheat above 150°C, or direct exposure to IR reflow (or IR preheat) allowed, to avoid damaging the Lithium battery.
CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode.
M48T128Y Features
` INTEGRATED, ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY, AND CRYSTAL
` BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, AND SECONDS
` AUTOMATIC POWER-FAIL CHIP DESELECT AND WRITE PROTECTION
` WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage):
M48T128Y: VCC = 4.5 to 5.5V
4.1V VPFD 4.5V
M48T128V*: VCC = 3.0 to 3.6V
2.7V VPFD 3.0V
` CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES
` SOFTWARE CONTROLLED CLOCK
CALIBRATION FOR HIGH ACCURACY APPLICATIONS
` 10 YEARS OF DATA RETENTION AND
CLOCK OPERATION IN THE ABSENCE OF POWER
` SELF-CONTAINED BATTERY AND CRYSTAL IN THE DIP PACKAGE
` PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD 128K x 8 SRAMs
` BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, AND SECONDS
` AUTOMATIC POWER-FAIL CHIP DESELECT AND WRITE PROTECTION
` WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage):
M48T128Y: VCC = 4.5 to 5.5V
4.1V VPFD 4.5V
M48T128V*: VCC = 3.0 to 3.6V
2.7V VPFD 3.0V
` CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES
` SOFTWARE CONTROLLED CLOCK
CALIBRATION FOR HIGH ACCURACY APPLICATIONS
` 10 YEARS OF DATA RETENTION AND
CLOCK OPERATION IN THE ABSENCE OF POWER
` SELF-CONTAINED BATTERY AND CRYSTAL IN THE DIP PACKAGE
` PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD 128K x 8 SRAMs
M48T128Y Connection Diagram
M48T128Y
PDF/DataSheet Download
- Datasheet: M48T128Y
- File Size: 349065 KB
- Manufacturer: STMICROELECTRONICS [STMicroelectronics]
- Click here to Download
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