BQ3287 RTC 模块，具有 114x8 NVSRAM，在 A 版本上具有 RAM 清零功能

BQ3287 描述

The CMOS bq3287/bq3287A is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square-wave output, and 114 bytes of general nonvolatile storage. The bq3287A version is identical to the bq3287, with the addition of the RAM clear input. The bq3287 is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The bq3287 write-protects the clock, calendar, and storage registers during power failure. The integral backup energy source then maintains data and operates the clock and calendar. As shipped from Benchmarq, the real time clock is turned off to maximize battery capacity for in-system operation

	BQ3287	BQ3287A	BQ3287E	BQ3287EA	BQ4287
Supply Voltage(V)	5	5	5	5	5
Bus Interface	Multiplexed	Multiplexed	Multiplexed	Multiplexed	Multiplexed
Memory Density(Kb)	0.114	0.114	0.242	0.242	0.114
Operating Temperature Range(°C)	-20 to 70,0 to 70	-20 to 70,0 to 70	0 to 70	0 to 70	0 to 70
Pin/Package	24DIP MODULE	24DIP MODULE	24DIP MODULE	24DIP MODULE	24DIP MODULE
Approx. Price (US$)	4.20 \| 1ku	4.20 \| 1ku	4.20 \| 1ku	4.20 \| 1ku	5.80 \| 1ku
RTC Bytes	14	14	14	14	14

BQ3287 特性

Direct clock/calendar replacement for IBM\xAE AT-compatible computers and other applications
Functionally compatible with the DS1287/DS1287A and MC146818A
114 bytes of general nonvolatile storage
Integral lithium cell and crystal
160 ns cycle time allows fast bus operation
Selectable Intel or Motorola bus timing
14 bytes for clock/calendar and control
BCD or binary format for clock and calendar data
Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
Calendar in day of the week, day of the month, months, and years with automatic leap-year adjustment
Programmable square wave output
Three individually maskable interrupt event flags:
- Periodic rates from 122us to 500ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
Better than one minute per month clock accuracy

BQ3287 芯片订购指南

器件	状态	温度 (oC)	价格（美元）	封装 \| 引脚	封装数量 \| 封装载体	丝印标记
BQ3287MT-I	ACTIVE	-20 to 70	4.20 \| 1ku	DIP MODULE (MT) \| 24	15
BQ3287MT-SB2	ACTIVE	0 to 70	4.20 \| 1ku	DIP MODULE (MT) \| 24	15

BQ3287 质量与无铅数据

器件	环保计划*	铅/焊球涂层	MSL 等级/回流焊峰	环保信息与无铅 (Pb-free)	DPPM / MTBF / FIT 率
BQ3287MT-I	Pb-Free (RoHS)	Call TI	N/A for Pkg Type	BQ3287MT-I	BQ3287MT-I
BQ3287MT-SB2	Pb-Free (RoHS)	Call TI	N/A for Pkg Type	BQ3287MT-SB2	BQ3287MT-SB2

BQ3287 应用技术支持与电子电路设计开发资源下载

BQ3287 数据资料 dataSheet 下载.PDF
TI 德州仪器实时时钟产品选型与价格 . xls
PowerPAD™ Thermally Enhanced Package (PDF 1040 KB)
全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A) (PDF 2206 KB)
Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
PowerPAD™ Made Easy (PDF 57 KB)
标准线性产品交叉参考 (Rev. D) (PDF 1058 KB)
模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
所选封装材料的热学和电学性质 (PDF 645 KB)
高速数据转换 (PDF 1967 KB)

BQ3287 相关工具

名称	型号	公司	工具/软件类型
BQ3287 评估模块	BQ3287EVM	Texas Instruments	开发电路板/EVM