BQ3285E 具有 242x8 NVSRAM 警报唤醒功能的 RTC IC

BQ3285E 描述

The CMOS bq3285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable interrupt sources, square-wave output, and 242 bytes of general nonvolatile storage. A 32.768kHz output is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode. The bq3285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar. The bq3285E/L is a fully compatible real-time clock for IBM AT-compatible computers and other applications

	BQ3285	BQ3285E	BQ3285LD	BQ3285LF
Supply Voltage(V)	5	5	3	3
Bus Interface	Multiplexed	Multiplexed	Multiplexed	Multiplexed
Memory Density(Kb)	0.114	0.242	0.242	0.242
Operating Temperature Range(°C)	0 to 70	0 to 70	0 to 70
Pin/Package	24PDIP, 24SOIC	24PDIP, 24SOIC, 24SSOP/QSOP	24SSOP/QSOP	24SSOP/QSOP
Approx. Price (US$)	2.10 | 1ku	2.10 | 1ku	2.10 | 1ku	2.10 | 1ku
RTC Bytes		14	14	14

BQ3285E 特性

• Direct clock/calendar replacement for IBM(R) AT-compatible computers and other applications
• Functionally compatible with the DS1285
  • Closely matches MC146818A pin configuration
• 2.7–3.6V operation (bq3285L);
  4.5–5.5V operation (bq3285E)
• 242 bytes of general nonvolatile storage
• 32.768kHz output for power management
• System wake-up capability—alarm interrupt output active in battery-backup mode
• Less than 0.5uA load under battery operation
• Selectable Intel or Motorola bus timing
• 14 bytes for clock/calendar and control
• BCD or binary format for clock and calendar data
• Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
• Time of day in seconds, minutes, and hours
  • 12- or 24-hour format
  • Optional daylight saving 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

BQ3285E 芯片订购指南

器件	状态	价格（美元）	封装 | 引脚	封装数量 | 封装载体	丝印标记
BQ3285ESS	ACTIVE	2.55 | 1ku	SSOP/QSOP (DBQ) | 24	50 | TUBE	3285ESS -B5
BQ3285ESSG4	ACTIVE	2.55 | 1ku	SSOP/QSOP (DBQ) | 24	50 | TUBE	3285ESS -B5
BQ3285ESSTR	ACTIVE	2.10 | 1ku	SSOP/QSOP (DBQ) | 24	2500 | LARGE T&R	3285ESS -B5
BQ3285ESSTRG4	ACTIVE	2.10 | 1ku	SSOP/QSOP (DBQ) | 24	2500 | LARGE T&R	3285ESS -B5

BQ3285E 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
BQ3285ESS	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	BQ3285ESS	BQ3285ESS
BQ3285ESSG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	BQ3285ESSG4	BQ3285ESSG4
BQ3285ESSTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	BQ3285ESSTR	BQ3285ESSTR
BQ3285ESSTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	BQ3285ESSTRG4	BQ3285ESSTRG4

BQ3285E 应用技术支持与电子电路设计开发资源下载

1. BQ3285E 数据资料 dataSheet 下载.PDF
2. TI 德州仪器实时时钟产品选型与价格 . xls
3. PowerPADTM Thermally Enhanced Package (PDF 1040 KB)
4. 全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A) (PDF 2206 KB)
5. Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
6. PowerPADTM Made Easy (PDF 57 KB)
7. 标准线性产品交叉参考 (Rev. D) (PDF 1058 KB)
8. 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
9. 所选封装材料的热学和电学性质 (PDF 645 KB)
10. 高速数据转换 (PDF 1967 KB)

BQ3285E 相关工具

名称	型号	公司	工具/软件类型
BQ3285E 评估模块	BQ3285EEVM	Texas Instruments	开发电路板/EVM