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时钟和计时
实时时钟 (RTC) 和计时器

BQ4802Y

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具有 CPU 监控器和外部 NVSRAM 控制的符合 Y2K 的并行 RTC，5V Vcc

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数据表

BQ4802Y

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数据表 立即订购

产品详情

Function Real-time clock Iq (typ) (mA) 0.0005 Features 16 RTC bytes, External SRAM control, Integrated CPU supervisor, Parallel bus interface Rating Catalog Operating temperature range (°C) 0 to 70 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 4.5
Function Real-time clock Iq (typ) (mA) 0.0005 Features 16 RTC bytes, External SRAM control, Integrated CPU supervisor, Parallel bus interface Rating Catalog Operating temperature range (°C) 0 to 70 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 4.5
SOIC (DW) 28 184.37 mm² 17.9 x 10.3 TSSOP (PW) 28 62.08 mm² 9.7 x 6.4
  • Real-Time Clock Counts Seconds Through Centuries in BCD Format
    • bq4802Y: 5-V Operation
    • bq4802LY: 3.3-V Operation
  • On-Chip Battery-Backup Switchover Circuit With Nonvolatile Control for External SRAM
  • Less Than 500 nA of Clock Operation Current in Backup Mode
  • Microprocessor Reset With Push-Button Override
  • Independent Watchdog Timer With Programmable Time-Out Period
  • Power-Fail Interrupt Warning
  • Programmable Clock Alarm Interrupt Active in Battery-Backup Mode
  • Programmable Periodic Interrupt
  • Battery-Low Warning
  • 28-pin SOIC, TSSOP, and SNAPHAT Package Options
  • APPLICATIONS
    • Telecommunications Base Stations
    • Servers
    • Handheld Data Collection Equipment
    • Medical Equipment
    • Handheld Instrumentation
    • Test Equipment
  • Real-Time Clock Counts Seconds Through Centuries in BCD Format
    • bq4802Y: 5-V Operation
    • bq4802LY: 3.3-V Operation
  • On-Chip Battery-Backup Switchover Circuit With Nonvolatile Control for External SRAM
  • Less Than 500 nA of Clock Operation Current in Backup Mode
  • Microprocessor Reset With Push-Button Override
  • Independent Watchdog Timer With Programmable Time-Out Period
  • Power-Fail Interrupt Warning
  • Programmable Clock Alarm Interrupt Active in Battery-Backup Mode
  • Programmable Periodic Interrupt
  • Battery-Low Warning
  • 28-pin SOIC, TSSOP, and SNAPHAT Package Options
  • APPLICATIONS
    • Telecommunications Base Stations
    • Servers
    • Handheld Data Collection Equipment
    • Medical Equipment
    • Handheld Instrumentation
    • Test Equipment

The bq4802Y/bq4802LY real-time clock is a low-power microprocessor peripheral that integrates a time-of-day clock, a century-based calendar, and a CPU supervisor, with package options including a 28-pin SOIC, TSSOP, or SNAPHAT that requires the bq48SH-28x6 to complete the two-piece module. The bq4802Y/ bq4802LY is ideal for fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and computers.

The bq4802Y/bq4802LY provides direct connections for a 32.768-kHz quartz crystal and a 3-V backup battery. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4802Y/bq4802LY can write-protect and make non- volatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information the absence of system voltage. The crystal and battery are contained within the modules for a more integrated solution.

The bq4802Y/bq4802LY contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply. When the bq4802Y/bq4802LY detects an out-of-tolerance condition, it generates an interrupt warning and subsequently a microprocessor reset. The reset stays active for 200 ms after VCC rises within tolerance, to allow for power supply and processor stabilization. The reset function also allows for an external push-button override.

The bq4802Y/bq4802LY real-time clock is a low-power microprocessor peripheral that integrates a time-of-day clock, a century-based calendar, and a CPU supervisor, with package options including a 28-pin SOIC, TSSOP, or SNAPHAT that requires the bq48SH-28x6 to complete the two-piece module. The bq4802Y/ bq4802LY is ideal for fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and computers.

The bq4802Y/bq4802LY provides direct connections for a 32.768-kHz quartz crystal and a 3-V backup battery. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4802Y/bq4802LY can write-protect and make non- volatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information the absence of system voltage. The crystal and battery are contained within the modules for a more integrated solution.

The bq4802Y/bq4802LY contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply. When the bq4802Y/bq4802LY detects an out-of-tolerance condition, it generates an interrupt warning and subsequently a microprocessor reset. The reset stays active for 200 ms after VCC rises within tolerance, to allow for power supply and processor stabilization. The reset function also allows for an external push-button override.
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* 数据表 Parallel Real-Time Clock with CPU Supervisor and External SRAM Non-Volatile 数据表 (Rev. C) 2002年 6月 3日

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SOIC (DW) 28 查看选项
TSSOP (PW) 28 查看选项
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包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
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