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Part Number: M48T18
Description: The M48T08/18 TIMEKEEPER® RAM is an 8K x 8 non-volatile static RAM and real time clock ...
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M48T18
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DataSheet
General Description
M48T18 General Description
The M48T08/18 TIMEKEEPER® RAM is an 8K x 8 non-volatile static RAM and real time clock which is pin and functional compatible with the DS1643. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.
The M48T08/18 is a non-volatile pin and function equivalent to any JEDEC standard 8K 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 M48T08/18 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 surface-mounting. The SNAPHAT housing is keyed to prevent reverse insertion.
M48T18 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 |
0.3 to 7 |
V
|
| IO | Output Current |
20 |
mA |
| PD | Power Dissipation |
1 |
W |
Notes: 1. Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect reliability.
2. Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds).
CAUTION: Negative undershoots below 0.3 volts are not allowed on any pin while in the Battery Back-up mode.
CAUTION: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
M48T18 Features
`INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY
`BYTEWIDEä 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 VOLTAGES (VPFD = Power-fail Deselect Voltage):
M48T08: 4.5V VPFD 4.75V
M48T18: 4.2V VPFD 4.5V
`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 8K x 8 SRAMs
`BYTEWIDEä 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 VOLTAGES (VPFD = Power-fail Deselect Voltage):
M48T08: 4.5V VPFD 4.75V
M48T18: 4.2V VPFD 4.5V
`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 8K x 8 SRAMs
M48T18 Connection Diagram
M48T18
PDF/DataSheet Download
- Datasheet: M48T18
- File Size: 483209 KB
- Manufacturer: STMICROELECTRONICS [STMicroelectronics]
- Click here to Download
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