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DS1557P-100 PDF预览

DS1557P-100

更新时间: 2024-11-16 22:17:35
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光电二极管双倍数据速率
页数 文件大小 规格书
19页 270K
描述
4MEG NV Y2KC Timekeeping RAM

DS1557P-100 技术参数

生命周期:Obsolete包装说明:POWERCAP MODULE-34
Reach Compliance Code:unknown风险等级:5.64
Is Samacsys:N外部数据总线宽度:8
信息访问方法:PARALLEL, DIRECT ADDRESS中断能力:Y
JESD-30 代码:R-PDSO-J34端子数量:34
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
封装等效代码:MODULE,34LEAD,1.0封装形状:RECTANGULAR
封装形式:SMALL OUTLINE电源:5 V
认证状态:Not Qualified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:YES
技术:CMOS温度等级:COMMERCIAL
端子形式:J BEND端子位置:DUAL
最短时间:SECONDS易失性:NO
uPs/uCs/外围集成电路类型:TIMER, REAL TIME CLOCKBase Number Matches:1

DS1557P-100 数据手册

 浏览型号DS1557P-100的Datasheet PDF文件第2页浏览型号DS1557P-100的Datasheet PDF文件第3页浏览型号DS1557P-100的Datasheet PDF文件第4页浏览型号DS1557P-100的Datasheet PDF文件第5页浏览型号DS1557P-100的Datasheet PDF文件第6页浏览型号DS1557P-100的Datasheet PDF文件第7页 
PRELIMINARY  
DS1557  
4MEG NV Y2KC Timekeeping RAM  
www.dalsemi.com  
FEATURES  
PIN ASSIGNMENT  
Integrated NV SRAM, real time clock, crystal,  
power-fail control circuit and lithium energy  
source  
Clock registers are accessed identically to the  
static RAM; these registers are resident in the  
16 top RAM locations  
Century byte register; i.e., Y2K complaint  
Totally nonvolatile with over 10 years of  
operation in the absence of power  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
A18  
A17  
A14  
A13  
A12  
A11  
A10  
A9  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
IRQ/FT  
A15  
A16  
RST  
VCC  
WE  
OE  
CE  
A8  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0  
Precision power-on reset  
DQ2  
DQ1  
DQ0  
GND  
Programmable watchdog timer and RTC alarm  
BCD coded year, month, date, day, hours,  
minutes, and seconds with automatic leap year  
compensation valid up to the year 2100  
Battery voltage level indicator flag  
Power-fail write protection allows for ±10%  
VBAT X2  
X1 GND  
34-Pin POWERCAP MODULE BOARD  
(USES DS9034PCX POWERCAP)  
PIN DESCRIPTION  
VCC power supply tolerance  
A0-A14  
DQ0-DQ7  
IRQ \FT  
- Address Input  
- Data Input/Outputs  
Lithium energy source is electrically  
disconnected to retain freshness until power is  
applied for the first time  
- Interrupt, Frequency Test  
Output (Open Drain)  
RST  
- Power-On Reset Output  
(Open Drain)  
ORDERING INFORMATION  
DS1557P-XXX  
(5-Volt)  
-70  
70 ns access  
CE  
OE  
- Chip Enable  
- Output Enable  
-100 100 ns access  
*DS1557WP-XXX (3.3 Volt)  
-120 120 ns access  
-150 150 ns access  
*DS9034PCX (PowerCap) Required:  
must be ordered seperately  
WE  
- Write Enable  
- Power Supply Input  
- Ground  
- No Connection  
- Crystal Connection  
- Battery Connection  
VCC  
GND  
NC  
X1, X2  
VBAT  
DESCRIPTION  
The DS1557 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) with a RTC  
alarm, watchdog timer, power-on reset, battery monitor, and 512k x 8 non-volatile static RAM. User  
access to all registers within the DS1557 is accomplished with a bytewide interface as shown in Figure 1.  
The RTC Registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour  
BCD format. Corrections for day of month and leap year are made automatically.  
1of 19  
012700  

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