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參數(shù)資料
| 型號： | BQ4847MT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | XO, clock |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| 封裝： | MODULE, DIP-28 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 246K |
| 代理商： | BQ4847MT |
Functional Description
Figure 1 is a block diagram of the bq4847. The bq4847 is
functionally equivalent to the bq4845 except that the bat-
tery (20, 24) and crystal (2, 3) pins are not accessible. The
pins are connected internally to a coin cell and quartz
crystal. The coin cell provides 130mAh of capacity. It is in-
ternally isolated from VOUT and CEOUT until the initial
application of VCC. Once VCC rises above VPFD, this isola-
tion is broken, and the backup cell provides power to
VOUT and CEOUT for the external SRAM. The real-time
clock keeps time to within one minute per month at
room temperature. For a complete description of fea-
tures, operating conditions, electrical characteristics,
bus timing, and pin descriptions, see the bq4845 data
sheet. Valid part types for ordering are bq4847MT (5%)
and bq4847YMT (10%).
Figure 2 illustrates the address map for the bq4847. Ta-
ble 1 is a map of the bq4847 registers, and Table 2 de-
scribes the register bits.
2
Figure 1. Block Diagram
VCC
CS
OE
WE
CEOUT
VOUT
Mode
DQ
Power
<VCC (max.)
VIH
XX
CEIN
VOUT1
Deselect
High Z
Standby
VIL
XVIL
CEIN
VOUT1
Write
DIN
Active
>VCC (min.)
VIL
VIH
CEIN
VOUT1
Read
DOUT
Active
VIL
VIH
CEIN
VOUT1
Read
High Z
Active
<VPFD (min.) > VSO
XXX
VOH
VOUT1
Deselect
High Z
CMOS standby
≤ VSO
XXX
VOHB
VOUT2
Deselect
High Z
Battery-backup mode
Truth Table
bq4847/bq4847Y
Sept. 1996
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4847-MT | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With CPU Supervisor |
| BQ4847Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With CPU Supervisor |
| BQ4847YMT | 功能描述:實時時鐘 RTC with NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ4847Y-MT | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With CPU Supervisor |
| BQ4850Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RTC Module With 512Kx8 NVSRAM |
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