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DS1644 PDF预览

DS1644

更新时间: 2024-11-19 06:54:39
品牌 Logo 应用领域
美信 - MAXIM 时钟
页数 文件大小 规格书
14页 200K
描述
Nonvolatile Timekeeping RAM

DS1644 技术参数

是否无铅: 含铅是否Rohs认证: 不符合
生命周期:Obsolete零件包装代码:MODULE
包装说明:DIP, DIP28,.6针数:28
Reach Compliance Code:not_compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.71
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:N
JESD-30 代码:R-XDMA-P28JESD-609代码:e0
端子数量:28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:UNSPECIFIED封装代码:DIP
封装等效代码:DIP28,.6封装形状:RECTANGULAR
封装形式:MICROELECTRONIC ASSEMBLY峰值回流温度(摄氏度):NOT SPECIFIED
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:NO技术:CMOS
温度等级:COMMERCIAL端子面层:Tin/Lead (Sn/Pb)
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
uPs/uCs/外围集成电路类型:TIMER, REAL TIME CLOCKBase Number Matches:1

DS1644 数据手册

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19-5203; Rev 4/10  
DS1644/DS1644P  
Nonvolatile Timekeeping RAM  
www.maxim-ic.com  
FEATURES  
PIN CONFIGURATIONS  
VCC  
WE  
A13  
A8  
A14  
1
28  
27  
. Integrated NV SRAM, Real-Time Clock,  
Crystal, Power-Fail Control Circuit and  
Lithium Energy Source  
2
3
4
A12  
A7  
26  
25  
A6  
A5  
A9  
5
6
24  
23  
. Clock Registers are Accessed Identically to  
the Static RAM. These Registers are  
A11  
OE  
A10  
A4  
A3  
A2  
7
8
22  
21  
Resident in the Eight Top RAM Locations.  
A1  
A0  
CE  
DQ7  
DQ6  
9
10  
20  
19  
. Totally Nonvolatile with Over 10 Years of  
Operation in the Absence of Power  
DQ0  
11  
12  
18  
17  
DQ1  
DQ2  
GND  
DQ5  
DQ4  
DQ3  
. BCD-Coded Year, Month, Date, Day, Hours,  
Minutes, and Seconds with Leap Year  
Compensation Valid Up to 2100  
13  
14  
16  
15  
28-Pin Encapsulated Package  
(720-mil Extended)  
. Power-Fail Write Protection Allows for  
±10% VCC Power Supply Tolerance  
. DS1644 Only (DIP Module)  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
NC  
NC  
A14  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
NC  
NC  
NC  
Upward Compatible with the DS1643  
Timekeeping RAM to Achieve Higher  
RAM Density  
Standard JEDEC Bytewide 32k x 8 Static  
RAM Pinout  
A13  
A12  
A11  
A10  
A9  
PFO  
VCC  
WE  
OE  
CE  
A8  
DQ7  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0  
DQ6  
DQ5  
DQ4  
DQ3  
DQ2  
DQ1  
DQ0  
GND  
. DS1644P Only (PowerCap Module Board)  
Surface Mountable Package for Direct  
Connection to PowerCap Containing  
Battery and crystal  
X2  
X1 GND VBAT  
Replaceable Battery (PowerCap)  
Power-Fail Output  
Pin-for-Pin Compatible with Other Densities  
of DS164XP Timekeeping RAM  
Underwriters Laboratory (UL) Recognized  
34-Pin PowerCap Module Board  
(Uses DS9034PCX PowerCap)  
ORDERING INFORMATION  
PART  
DS1644-120+  
DS1644P-120+  
VOLTAGE (V)  
TEMP RANGE PIN-PACKAGE  
TOP MARK  
DS1644+120  
DS1644P+120  
5.0  
5.0  
0°C to +70°C  
0°C to +70°C  
32 EDIP (0.740a)  
34 PowerCap*  
*DS9034-PCX, DS9034I-PCX, DS9034-PCX+ required (must be ordered separately).  
+Denotes a lead(Pb)-free/RoHS-compliant package. The top mark includes a “+” symbol on lead(Pb)-free devices.  
1 of 14  

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