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DS1742W-120 PDF预览

DS1742W-120

更新时间: 2024-02-23 23:58:41
品牌 Logo 应用领域
达拉斯 - DALLAS 计时器或实时时钟微控制器和处理器外围集成电路双倍数据速率
页数 文件大小 规格书
12页 165K
描述
Y2KC Nonvolatile Timekeeping RAM

DS1742W-120 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:8473.30.11.80风险等级:8.47
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, DIRECT ADDRESS
中断能力:NJESD-30 代码:R-PDIP-P24
JESD-609代码:e3长度:37.595 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: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):260
电源:3.3 V认证状态:Not Qualified
座面最大高度:8.51 mm子类别:Timer or RTC
最大供电电压:3.63 V最小供电电压:2.97 V
标称供电电压:3.3 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:PIN/PEG
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

DS1742W-120 数据手册

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DS1742  
Y2KC Nonvolatile Timekeeping RAM  
www.dalsemi.com  
PIN ASSIGNMENT  
FEATURES  
Integrated NV SRAM, real time clock,  
crystal, power-fail control circuit and lithium  
energy source  
Clock registers are accessed identical to the  
static RAM. These registers are resident in  
the eight top RAM locations  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0  
DQ0  
DQ1  
DQ2  
GND  
1
2
3
4
5
6
7
8
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
VCC  
A8  
A9  
WE  
OE  
A10  
CE  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
Century byte register  
9
10  
11  
12  
Totally nonvolatile with over 10 years of  
operation in the absence of power  
BCD coded century, year, month, date, day,  
hours, minutes, and seconds with automatic  
leap year compensation valid up to the year  
2100  
PIN DESCRIPTION  
A0-A10  
CE  
- Address Inputs  
- Chip Enable  
- Output Enable  
- Write Enable  
- Power Supply Input  
- Ground  
Battery voltage level indicator flag  
Power-fail write protection allows for ±10%  
OE  
VCC power supply tolerance  
WE  
Lithium energy source is electrically  
disconnected to retain freshness until power is  
applied for the first time  
VCC  
GND  
DQ0-DQ7  
- Data Input/Outputs  
Standard JEDEC bytewide 2k x 8 static RAM  
pinout  
Quartz accuracy ±1 minute a month @ 25°C,  
factory calibrated  
ORDERING INFORMATION  
DS1742-XXX  
(5V)  
-70  
70 ns access  
-100 100 ns access  
DS1742W-XXX  
(3.3V)  
-120 120 ns access  
-150 150 ns access  
DESCRIPTION  
The DS1742 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 2k x 8  
non-volatile static RAM. User access to all registers within the DS1742 is accomplished with a bytewide  
interface as shown in Figure 1. The Real Time Clock (RTC) information and control bits reside in the  
eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours,  
minutes, and seconds data in 24-hour BCD format. Corrections for the day of the month and leap year  
are made automatically.  
1 of 12  
091800  

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