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BQ4285LQN

更新时间： 2024-09-10 13:05:59
品牌 Logo 应用领域
德州仪器 - TI 时钟
页数 文件大小 规格书
24页 1025K
描述
1 TIMER(S), REAL TIME CLOCK, PQCC28, PLASTIC, LCC-28

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中文翻译

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BQ4285LQN 技术参数

生命周期：Obsolete零件包装代码：QLCC
包装说明：PLASTIC, LCC-28针数：28
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.72
Is Samacsys：N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：S-PQCC-J28
端子数量：28计时器数量：1
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：QCCJ
封装等效代码：LDCC28,.5SQ封装形状：SQUARE
封装形式：CHIP CARRIER电源：3.15 V
认证状态：Not Qualified子类别：Timer or RTC
最大供电电压：3.6 V最小供电电压：2.7 V
标称供电电压：3.15 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子形式：J BEND端子节距：1.27 mm
端子位置：QUAD最短时间：SECONDS
易失性：YESuPs/uCs/外围集成电路类型：TIMER, REAL TIME CLOCK
Base Number Matches：1

BQ4285LQN 数据手册

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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  
➤ Selectable Intel or Motorola bus  
timing (PLCC), Intel bus timing  
(DIP and SOIC)  
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  
(PLCC only )  
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
6
AD  
AD  
25  
24  
CE  
BC  
0
1
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  
7
8
9
10  
11  
AD  
AD  
AD  
AD  
23  
22  
21  
20  
19  
INT  
RST  
DS  
2
3
4
5
RST  
7
SQW  
BC  
X1–X2  
Square wave output  
3V backup cell input  
Crystal inputs  
8
9
V
SS  
NC  
R/W  
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  
24-Pin DIP or SOIC  
PN428501.eps  
PN428502.eps  
+5V supply  
VSS  
Ground  
Jan. 1999 D  
1
1234567...24

中文翻译

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