M48T37Y中文资料5.0或3.3 V, 256 Kbit（32 Kbit x 8）TIMEKEEPER® SRAM数据手册ST规格书

描述 Description

The M48T37Y/V TIMEKEEPER®RAM is a 32 Kb x 8 non-volatile static RAM and real-time clock. The monolithic chip is available in a special package which provides a highly integrated battery-backed memory and real-time clock solution.

The 44-lead, 330 mil SOIC package 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/crystal 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.

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 “M4T28-BR12SH” or “M4T32-BR12SH”.

特性 Features

• Integrated ultra low power SRAM, real-time clock, power-fail control circuit, and battery
• Frequency test output for real-time clock software calibration
• Automatic power-fail chip deselect and WRITE protection
• Watchdog timer
• WRITE protect voltage (VPFD= Power-fail deselect voltage):
•M48T37Y: VCC= 4.5 to 5.5 V 4.2 V ≤ VPFD≤ 4.5 V
•M48T37V: VCC= 3.0 to 3.6 V 2.7 V ≤ VPFD≤ 3.0 V
• 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
• Microprocessor power-on reset (valid even during battery backup mode)
• Programmable alarm output active in the battery backup mode
• Battery low flag
• RoHS compliant
•Lead-free second level interconnect

简介

M48T37Y属于集成电路（IC）的实时时钟。由制造生产的M48T37Y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。