M48T201V TIMEKEEPER SUPERVISOR
The M48T201Y/V are self-contained devices that include a real time clock (RTC), programmable alarms, a watchdog timer, and a square wave output which provides control of up to 512 K x 8 of external low-power static RAM. Access to all RTC functions and the external RAM is the same as conventional bytewide SRAM. The 16 TIMEKEEPER® registers offer year, month, date, day, hour, minute, second, calibration, alarm, century, watchdog, and square wave output data. Externally attached static RAMs are controlled by the M48T201Y/V via the GCON and ECON signals.
The 44-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 damage due to the high temperatures required for device surface-mounting. The SNAPHAT housing is keyed to prevent reverse insertion. The SOIC and battery packages are shipped separately in plastic anti-static tubes or in tape & reel form. For the 44-lead SOIC, the battery/crystal package (e.g. SNAPHAT) part number is M4Txx-BR12SH (see Table 19 on page 33).
技术特性
- Converts low power SRAM into NVRAMs
- Year 2000 compliant
- Battery low flag
- Integrated real time clock, power-fail control circuit, battery and crystal
- Watchdog timer
- Choice of write protect voltages
- M48T201Y: VCC = 4.5 to 5.5V 4.1V≤VPFD≤4.5V
- M48T201V: VCC = 3.0 to 3.6V 2.7V≤VPFD≤3.0V
- Microprocessor power-on reset (valid even during battery back-up mode.)
- Programmable alarm output active in the battery backed-up mode
- Packaging includes a 44-lead SOIC and SNAPHAT® top (to be ordered separately)
- SOIC package provides direct connection for a SNAPHAT® top which contains the battery and crystal
- RoHS compliant
- Lead-free second level interconnect
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功能框图
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M48T201V 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 |
| M48T201V-85MH1F |
Active |
|
|
SO-44 |
Tape And Reel |
0 °C-70°C |
M48T201V-85MH1F |
DATASHEET
| 描述 |
版本 |
大小 |
| M48T201V : DS1317: 5.0 or 3.3 V TIMEKEEPER® supervisor |
7 |
304KB |
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN923: TIMEKEEPER® rolling into the year 2000 (21st century, Y2K) |
1 |
20KB |
| AN1000: Reduced footprint ZEROPOWER® and TIMEKEEPER® supervisor surface-mount solution |
2 |
63KB |
| AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs |
4 |
440KB |
| AN1216: Implementing a periodic alarm with TIMEKEEPER® |
1 |
55KB |
| 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 |
