M48T12 TIMEKEEPER SRAM_BDTIC 代理M48T12

M48T12 TIMEKEEPER SRAM

The M48T02/12 TIMEKEEPER®RAM is a 2 Kb x 8 non-volatile static RAM and real-time clock which is pin and functional compatible with the DS1642.

A special 24-pin, 600 mil DIP CAPHAT™package houses the M48T02/12 silicon with a quartz crystal and a long life lithium button cell to form a highly integrated battery-backed memory and real-time clock solution.

The M48T02/12 button cell has sufficient capacity and storage life to maintain data and clock functionality for an accumulated time period of at least 10 years in the absence of power over the operating temperature range.

The M48T02/12 is a non-volatile pin and function equivalent to any JEDEC standard 2 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.

技术特性

Integrated, ultra low power SRAM, real-time clock, and power-fail control circuit
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
Software controlled clock calibration for high accuracy applications
Automatic power-fail chip deselect and WRITE protection
WRITE protect voltages (VPFD= power-fail deselect voltage):
- M48T02: VCC= 4.75 to 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
- M48T12: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
Self-contained battery and crystal in the CAPHAT™DIP package
Pin and function compatible with JEDEC standard 2 K x 8 SRAMs
RoHS compliant
- Lead-free second level interconnect

功能框图

M48T12 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
M48T12-150PC1	Active			PDIP 24 .7	Tube	0 °C-70°C	M48T12-150PC1
M48T12-70PC1	Active			PDIP 24 .7	Tube	0 °C-70°C	M48T12-70PC1

DATASHEET

描述	版本	大小
M48T12 : DS0493: 5.0 V, 16 Kbit (2 Kb X 8) TIMEKEEPER® SRAM	9	375KB

APPLICATION NOTES

描述	版本	大小
AN968: VMEbus TIMEKEEPER® requirements	1	38KB
AN925: Time update in ST's TIMEKEEPER® devices	1	31KB
AN923: TIMEKEEPER® rolling into the year 2000 (21st century, Y2K)	1	20KB
AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs	4	440KB
AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products	4	124KB
AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST	4	249KB
AN1009: 'Negative undershoot' NVRAM data corruption	1	34KB