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DS1743P PDF预览

DS1743P

更新时间: 2024-11-20 23:16:31
品牌 Logo 应用领域
达拉斯 - DALLAS 时钟
页数 文件大小 规格书
17页 250K
描述
Y2KC Nonvolatile Timekeeping RAM

DS1743P 数据手册

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DS1743/DS1743P  
Y2KC Nonvolatile Timekeeping RAM  
www.dalsemi.com  
FEATURES  
PIN ASSIGNMENT  
Integrated NV SRAM, real time clock, crystal, power-  
fail control circuit and lithium energy source  
NC  
A12  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
1
2
3
4
5
6
7
8
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
VCC  
Clock registers are accessed identical to the static  
RAM. These registers are resident in the eight top  
RAM locations.  
Century byte register  
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  
Battery voltage level indicator flag  
WE  
CE2  
A8  
A9  
A11  
OE  
A10  
CE  
9
A0  
10  
11  
12  
13  
14  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
DQ0  
DQ1  
DQ2  
GND  
Power-fail write protection allows for ±10% VCC  
power supply tolerance  
28-Pin Encapsulated Package  
(700-mil Extended)  
Lithium energy source is electrically disconnected to  
retain freshness until power is applied for the first time  
DIP Module only  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
NC  
NC  
NC  
NC  
A12  
A11  
A10  
A9  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
NC  
NC  
NC  
Standard JEDEC bytewide 8k x 8 static RAM  
pinout  
RST  
VCC  
WE  
OE  
CE  
PowerCap Module Board only  
Surface mountable package for direct connection  
to PowerCap containing battery and crystal  
A8  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
DQ2  
DQ1  
DQ0  
GND  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0  
Replaceable battery (PowerCap)  
Power-On Reset Output  
Pin for pin compatible with other densities of  
DS174XP Timekeeping RAM  
VBAT X2  
X1 GND  
19  
18  
34-Pin Powercap Module Board  
(Uses DS9034PCX Powercap)  
ORDERING INFORMATION  
DS1743P-XXX (5V)  
PIN DESCRIPTION  
-70  
70 ns access  
100 ns access  
A0-A12  
- Address Input  
-100  
CE  
- Chip Enable  
blank 28-pin DIP Module  
CE2  
- Chip Enable 2 (DIP  
Module only)  
- Output Enable  
P
34-pin PowerCap Module  
board*  
OE  
WE  
- Write Enable  
- Power Supply Input  
- Ground  
- Data Input/Output  
- No Connection  
- Power-On Reset Output  
(PowerCap Module board only)  
- Crystal Connection  
- Battery Connection  
*DS1743WP-XXX  
(3.3V)  
-120  
-150  
VCC  
120 ns access  
150 ns access  
GND  
DQ0-DQ7  
NC  
blank 28-pin DIP Module  
P
34-pin PowerCap Module  
board*  
RST  
*DS9034PCX (PowerCap) Required:  
X1, X2  
VBAT  
(must be ordered separately)  
1 of 17  
022301  

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