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BQ4285P-SB2 PDF预览

BQ4285P-SB2

更新时间: 2024-11-10 23:14:03
品牌 Logo 应用领域
德州仪器 - TI 时钟
页数 文件大小 规格书
27页 1142K
描述
Real-Time Clock RTC With NVRAM Control

BQ4285P-SB2 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:DIP
包装说明:DIP, DIP24,.6针数:24
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01Factory Lead Time:1 week
风险等级:5.69最大时钟频率:0.032 MHz
外部数据总线宽度:8信息访问方法:PARALLEL, MUXED BUS
中断能力:YJESD-30 代码:R-PDIP-T24
JESD-609代码:e3长度:31.75 mm
端子数量:24计时器数量:1
最高工作温度:70 °C最低工作温度:
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装等效代码:DIP24,.6封装形状:RECTANGULAR
封装形式:IN-LINE峰值回流温度(摄氏度):NOT SPECIFIED
电源:5 V认证状态:Not Qualified
座面最大高度:5.08 mm子类别:Timer or RTC
最大供电电压:5.5 V最小供电电压:4.5 V
标称供电电压:5 V表面贴装:NO
技术:CMOS温度等级:COMMERCIAL
端子面层:Matte Tin (Sn)端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
最短时间:SECONDS处于峰值回流温度下的最长时间:NOT SPECIFIED
易失性:NO宽度:15.24 mm
uPs/uCs/外围集成电路类型:TIMER, REAL TIME CLOCKBase Number Matches:1

BQ4285P-SB2 数据手册

 浏览型号BQ4285P-SB2的Datasheet PDF文件第2页浏览型号BQ4285P-SB2的Datasheet PDF文件第3页浏览型号BQ4285P-SB2的Datasheet PDF文件第4页浏览型号BQ4285P-SB2的Datasheet PDF文件第5页浏览型号BQ4285P-SB2的Datasheet PDF文件第6页浏览型号BQ4285P-SB2的Datasheet PDF文件第7页 
bq4285  
(
)
Real-Time Clock RTC With NVRAM Control  
Calendar in day of the week, day of  
General Description  
the month, months, and years, with  
Features  
Direct clock/calendar replace-  
ment for IBM® AT-compatible  
computers and other applications  
automatic leap-year adjustment  
The CMOS bq4285 is a low-power  
microprocessor peripheral providing  
a time-of-day clock and 100-year cal-  
endar with alarm features and bat-  
tery operation. Other features include  
three maskable interrupt sources,  
square wave output, and 114 bytes of  
general nonvolatile storage.  
Time of day in seconds, minutes,  
and hours  
Functionally compatible with the  
- 12- or 24-hour format  
DS1285  
- Optional daylight saving  
- Closely matches MC146818A  
adjustment  
pin configuration  
BCD or binary format for clock  
The bq4285 write-protects the clock,  
calendar, and storage registers dur-  
ing power failure. A backup battery  
then maintains data and operates  
the clock and calendar.  
114 bytes of general nonvolatile  
and calendar data  
storage  
Programmable square wave out-  
Automatic backup and write-  
put  
protect control to external SRAM  
Three individually maskable in-  
160 ns cycle time allows fast bus  
The bq4285 is a fully compatible real-  
time clock for IBM AT-compatible com-  
puters and other applications. The only  
external components are a 32.768kHz  
crystal and a backup battery.  
terrupt event flags:  
operation  
- Periodic rates from 122 µs to  
500 ms  
- Time-of-day alarm once per  
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 pro-  
vides a VCC output sourced from the  
clock backup battery.  
second to once per day  
Less than 0.5 µA load under bat-  
tery operation  
- End-of-clock update cycle  
24-pin plastic DIP or SOIC  
14 bytes for clock/calendar and  
control  
Pin Connections  
Pin Names  
AD0–AD7  
Multiplexed address/data  
input/output  
MOT  
Bus type select input  
CS  
Chip select input  
V
24  
1
V
CC  
OUT  
X
1
23  
22  
2
3
SQW  
CE  
AS  
DS  
R/W  
Address strobe input  
Data strobe input  
Read/write input  
X
2
OUT  
4
CE  
AD  
0
21  
20  
19  
18  
17  
16  
15  
14  
13  
IN  
5
BC  
AD  
1
AD  
2
AD  
3
AD  
4
AD  
5
AD  
6
INT  
Interrupt request output  
Reset input  
6
INT  
RST  
DS  
V
SS  
R/W  
RST  
7
SQW  
BC  
X1–X2  
Square wave output  
3V backup cell input  
Crystal inputs  
8
9
10  
11  
12  
AS  
CS  
AD  
7
NC  
No connect  
V
SS  
CEIN  
CEOUT  
VOUT  
VCC  
RAM chip enable input  
RAM chip enable output  
Supply output  
28-Pin PLCC No longer available  
24-Pin DIP or SOIC  
PN428501.eps  
+5V supply  
VSS  
Ground  
SLUS002A JUNE 1991 - REVISED MAY 2004  
1

BQ4285P-SB2 替代型号

型号 品牌 替代类型 描述 数据表
BQ4287MT-SB2 TI

完全替代

Real-Time Clock Module With NVRAM Control

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