參數(shù)資料
型號(hào)： DS1744-70
廠商： DALLAS SEMICONDUCTOR
元件分類： Timer or RTC
英文描述： REAL TIME CLOCK, PDMA28
封裝： 0.700 INCH, PLASTIC, DIP-28
文件頁(yè)數(shù)： 11/18頁(yè)
文件大?。?/td> 221K
代理商： DS1744-70
DS1744/DS1744P
2 of 18
PIN DESCRIPTION
A0–A14
– Address Input
CE
– Chip Enable
OE
– Output Enable
WE
– Write Enable
V CC
– 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
V BAT
– Battery Connection
ORDERING INFORMATION
DS1744P–XXX (5 Volt)
-70 70 ns access
-100 100 ns access
blank
28-pin DIP Module
P
34-pin PowerCap Module board*
DS1744WP-XXX (3.3 Volt)
-120 120 ns access
-150 150 ns access
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 V CC 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(guān)PDF資料
PDF描述
DS1744WP-120 REAL TIME CLOCK, DMA34
DS1744P-70 0 TIMER(S), REAL TIME CLOCK, DMA28
DS1744W-120 0 TIMER(S), REAL TIME CLOCK, DMA28
DS1744P REAL TIME CLOCK, DMA34
DS1744 REAL TIME CLOCK, DMA28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1744-70+ 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1744-70IND 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1744-70IND/C01 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1744-70IND+ 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1744P 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Y2K-Compliant, Nonvolatile Timekeeping RAMs
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