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BQ3285LCSS PDF预览

BQ3285LCSS

更新时间: 2024-10-28 21:11:19
品牌 Logo 应用领域
德州仪器 - TI 时钟静态存储器光电二极管外围集成电路
页数 文件大小 规格书
26页 827K
描述
RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP

BQ3285LCSS 技术参数

是否无铅: 含铅生命周期:Obsolete
零件包装代码:SSOP包装说明:SOP,
针数:24Reach Compliance Code:unknown
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.81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
JESD-30 代码:R-PDSO-G24长度:8.65 mm
端子数量:24计时器数量:
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:SOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
认证状态:Not Qualified座面最大高度:1.73 mm
最大供电电压:5.5 V最小供电电压:2.7 V
标称供电电压:3 V表面贴装:YES
技术:CMOS温度等级:COMMERCIAL
端子形式:GULL WING端子节距:0.635 mm
端子位置:DUAL宽度:3.9 mm
uPs/uCs/外围集成电路类型:TIMER, REAL TIME CLOCKBase Number Matches:1

BQ3285LCSS 数据手册

 浏览型号BQ3285LCSS的Datasheet PDF文件第2页浏览型号BQ3285LCSS的Datasheet PDF文件第3页浏览型号BQ3285LCSS的Datasheet PDF文件第4页浏览型号BQ3285LCSS的Datasheet PDF文件第5页浏览型号BQ3285LCSS的Datasheet PDF文件第6页浏览型号BQ3285LCSS的Datasheet PDF文件第7页 
bq3285EC/LC  
(
)
Real-Time Clock RTC  
in battery-backup mode. In battery  
backup mode, current drain is less  
than 500nA.  
Features  
General Description  
Direct clock/calendar replace-  
ment for IBM® AT-compatible  
computers and other applications  
The CMOS bq3285EC/LC is a low-  
power microprocessor peripheral pro-  
viding a time-of-day clock and 100-  
year calendar with alarm features  
and battery operation. The architec-  
ture is based on the bq3285/7 RTC  
with added features: low-voltage op-  
eration, 32.768kHz output, and an  
extra 128 bytes of CMOS.  
The bq3285EC/LC write-protects the  
clock, calendar, and storage registers  
du r in g power fa ilu r e. A ba cku p  
battery then maintains data and oper-  
ates the clock and calendar.  
2.7–5.5V operation (bq3285LC);  
4.5–5.5V operation (bq3285EC)  
242 bytes of general nonvolatile  
The bq3285EC/LC is a fully com-  
patible real-time clock for IBM AT-  
compatible computers and other ap-  
plications. The only external compo-  
nents are a 32.768kHz crystal and a  
backup battery.  
storage  
Dedicated 32.768kHz output pin  
A 32.768kHz output is available for  
sustaining power-management ac-  
tivities. The bq3285EC 32kHz out-  
put is always on whenever VCC is  
valid. For the bq3285LC, the output  
is on when the oscillator is turned  
on . I n VC C s t a n d by m od e, t h e  
32kHz is active, and the bq3285LC  
t ypica lly dr a ws 100µA wh ile t h e  
bq3285EC typically draws 300µA.  
Wake-up capability is provided by  
an alarm interrupt, which is active  
System wake-up capability—  
alarm interrupt output active in  
battery-backup mode  
The bq3285EC is intended for use in  
5V systems. The bq3285LC is in-  
tended for use in 3V systems; the  
bq3285LC, however, may also oper-  
ate at 5V and then go into a 3V  
power-down state, write-protecting  
as if in a 3V system.  
Less than 0.5µA load under bat-  
tery operation  
Selectable Intel or Motorola bus  
timing  
24-pin plastic SOIC or SSOP  
Pin Connections  
Pin Names  
AD0–AD7 Multiplexed address/  
data input/output  
32K  
32.768kHz output  
EXTRAM Extended RAM enable  
MOT  
24  
1
V
CC  
MOT  
CS  
Bus type select input  
Chip select input  
Address strobe input  
Data strobe input  
Read/write input  
Interrupt request output  
Reset input  
X1  
X2  
23  
22  
2
3
32k  
EXTRAM  
RCL  
BC  
RAM clear input  
3V backup cell input  
Crystal inputs  
Power supply  
Ground  
4
RCL  
BC  
AD  
AD  
AD  
AD  
AD  
AD  
AD  
21  
20  
19  
18  
17  
16  
15  
14  
13  
0
1
2
3
4
5
6
5
AS  
6
INT  
RST  
DS  
V
SS  
R/W  
X1–X2  
VCC  
7
DS  
8
9
R/W  
INT  
RST  
10  
11  
12  
VSS  
AS  
CS  
AD  
7
V
SS  
24-Pin SSOP  
PN3285EC.eps  
July 1996  
1

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