參數(shù)資料
型號(hào)： BQ4285Q
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： XO, clock
英文描述： 1 TIMER(S), REAL TIME CLOCK, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 18/26頁(yè)
文件大小： 1079K
代理商： BQ4285Q
Product Folder: BQ4285, RTC IC With 114x8 NVSRAM and NVSRAM Control
BQ4285, RTC IC With 114x8 NVSRAM and NVSRAM Control
DEVICE STATUS: ACTIVE
PARAMETER NAME
BQ4285
Supply Voltage (V)
5
Bus Interface
Multiplexed
Memory Density (Kb) 0.114
Integrated CPU Supv No
FEATURES
q
Direct clock/calendar replacement for IBM AT-compatible computers and other applications
q
Functionally compatible with the DS1285
- Closely matches MC146818A pin configuration
q
114 bytes of general nonvolatile storage
q
Automatic backup and write-protect control to external SRAM
q
160 ns cycle time allows fast bus operation
q
Selectable Intel or Motorola bus timing (PLCC), Intel bus timing (DIP and SOIC)
q
Less than 0.5 uA load under battery operation
q
14 bytes for clock/calendar and control
q
Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
q
Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
q
BCD or binary format for clock and calendar data
q
Programmable square wave out-put
q
Three individually maskable interrupt event flags:
- Periodic rates from 122 us to 500 ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
q
24-pin plastic DIP or SOIC
DESCRIPTION
The CMOS bq4285 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 bq4285 write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains
data and operates the clock and calendar.
The bq4285 is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The only external
components are a 32.768kHz crystal and a backup battery.
The bq4285 integrates a battery-backup controller to make a standard CMOS SRAM nonvolatile during power-fail conditions.
During power-fail, the bq4285 automatically write-protects the external SRAM and provides a VCC output sourced from the
clock backup battery.
file:///G|/imaging/BITTING/cpl_rework/bq4285.html (1 of 2) [May-09-2002 4:39:02 PM]
相關(guān)PDF資料
PDF描述
BRN1-09P-TA1 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG
BRN1-09P-TA2 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG
BRN1-09P-TA3 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG
BRN1-09P-TA4 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG
BRN1-09P-TB1 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ4285Q- 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Real-Time Clock RTC With NVRAM Control
BQ4285S- 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Real-Time Clock RTC With NVRAM Control
BQ4285S-SB2 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
BQ4285S-SB2G4 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
BQ4285S-SB2TR 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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