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DS1744 PDF预览

DS1744

更新时间: 2023-12-20 18:44:40
品牌 Logo 应用领域
亚德诺 - ADI 时钟
页数 文件大小 规格书
16页 433K
描述
Y2K兼容、非易失时钟RAM

DS1744 数据手册

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DS1744/DS1744P  
Y2K-Compliant, Nonvolatile Timekeeping RAMs  
FEATURES  
PIN CONFIGURATIONS  
. 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 Eight Top RAM Locations.  
. Century Byte Register (i.e., Y2K Compliant)  
. 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  
TOP VIEW  
1
2
3
4
5
6
7
8
28 VCC  
A14  
A12  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
DS1744  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
WE  
A13  
A8  
A9  
A11  
OE  
A10  
CE  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
9
10  
11  
12  
13  
14  
A0  
DQ0  
DQ1  
DQ2  
GND  
. Battery Voltage-Level Indicator Flag  
. Power-Fail Write Protection Allows for ±10%  
EDIP  
VCC Power-Supply Tolerance  
. Lithium Energy Source is Electrically  
Disconnected to Retain Freshness Until  
Power is Applied for the First Time  
. DIP Module Only  
Standard JEDEC Byte-Wide 32k x 8 Static  
RAM Pinout  
. PowerCap Module Board Only  
Surface-Mountable Package for Direct  
Connection to PowerCap Containing  
Battery and Crystal  
Replaceable Battery (PowerCap)  
Power-On Reset Output  
Pin-for-Pin Compatible with Other Densities  
of DS174xP Timekeeping RAM  
. Also Available in Industrial Temperature  
Range: -40°C to +85°C  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
N.C.  
N.C.  
A14  
N.C.  
N.C.  
N.C.  
RST  
VCC  
1
2
DS1744P  
3
A13  
A12  
A11  
A10  
A9  
4
5
6
7
8
9
WE  
OE  
CE  
A8  
DQ7  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0  
10  
11  
12  
13  
14  
15  
16  
17  
DQ6  
DQ5  
DQ4  
DQ3  
DQ2  
DQ1  
DQ0  
GND  
VBAT  
X2  
GND  
X1  
PowerCap MODULE BOARD  
(Uses DS9034PCX+ or DS9034I-PCX+ PowerCap)  
. UL Recognized  
19-5502; Rev 6/13  
1 of 16  

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