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參數(shù)資料
| 型號： | DS1744 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | REAL TIME CLOCK, DMA28 |
| 封裝： | 0.700 INCH, PLASTIC, MODULE, DIP-28 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 225K |
| 代理商： | DS1744 |
DS1744/DS1744P
2 of 18
PIN DESCRIPTION
A0–A14
– Address Input
CE
– Chip Enable
OE
–
Output Enable
WE
–
Write Enable
VCC
– Power Supply Input
GND
– Ground
DQ0–DQ7
– Data Input/Output
NC
– No Connection
RST
– Power–on Reset Output (Power–
Cap Module board only)
X1, X2
– Crystal Connection
VBAT
– Battery Connection
ORDERING INFORMATION
DS1744P
(5V)
blank
28-pin DIP Module
P
34-pin PowerCap Module board*
DS1744WP
(3.3V)
blank
28-pin DIP Module
P
34-pin PowerCap Module board*
*DS9034PCX (PowerCap) Required:
(must be ordered separately)
DESCRIPTION
The DS1744 is a full function, year 2000 compliant (Y2KC), real–time clock/calendar (RTC) and 32k x 8
non–volatile static RAM. User access to all registers within the DS1744 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 date of each month and leap year
are made automatically. The RTC clock registers are double buffered to avoid access of incorrect data that
can occur during clock update cycles. The double buffered system also prevents time loss as the
timekeeping countdown continues unabated by access to time register data. The DS1744 also contains its
own power–fail circuitry which deselects the device when the VCC supply is in an out of tolerance
condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as
errant access and update cycles are avoided.
相關PDF資料 |
PDF描述 |
|---|---|
| DS1746-70 | 0 TIMER(S), REAL TIME CLOCK, DIP32 |
| DS1746WP-120 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1746W-120 | 0 TIMER(S), REAL TIME CLOCK, DIP32 |
| DS1746P-70 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1746 | REAL TIME CLOCK, DMA32 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1744_10 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Y2K-Compliant, Nonvolatile Timekeeping RAMs |
| DS1744_1203 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Y2K-Compliant, Nonvolatile Timekeeping RAMs |
| DS1744-70 | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1744-70+ | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1744-70IND | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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