M48T201Y数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

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).

特性 Features

• SOIC package provides direct connection for a SNAPHAT® top which contains the battery and crystal
• Packaging includes a 44-lead SOIC and SNAPHAT® top (to be ordered separately)
• RoHS compliantLead-free second level interconnect
• Microprocessor power-on reset (valid even during battery back-up mode.)
• Choice of write protect voltagesM48T201Y: VCC = 4.5 to 5.5V 4.1V≤VPFD≤4.5V\t\tM48T201V: VCC = 3.0 to 3.6V 2.7V≤VPFD≤3.0V\t\t
• Converts low power SRAM into NVRAMs
• Battery low flag
• Year 2000 compliant
• Watchdog timer
• Programmable alarm output active in the battery backed-up mode
• Integrated real time clock, power-fail control circuit, battery and crystal

简介

M48T201Y属于集成电路（IC）的实时时钟。由制造生产的M48T201Y实时时钟实时时钟 (RTC) 为几乎所有需要保持精确时间的电子设备提供时间和/或日期信息。时钟类型有二进制计数器、时钟/日历/监控器、历时计时器、幻时钟芯片、便携式系统控制器、温度记录器、时间事件记录器和计时器时钟外设。其包含 2 B 至 2 MB 不等的存储器，接口选项有 I2C、并行、串行、SPI、1 线式、2 线式、3 线式和 4 线式。