- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9324 > DS1744W-120 (Maxim Integrated Products)IC RTC RAM Y2K 3.3V 120NS 28EDIP PDF資料下載
參數(shù)資料
| 型號： | DS1744W-120 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC RAM Y2K 3.3V 120NS 28EDIP |
| 標(biāo)準包裝： | 12 |
| 類型： | 時鐘/日歷 |
| 特點： | 閏年，NVSRAM，Y2K |
| 存儲容量： | 32KB |
| 時間格式： | HH:MM:SS（24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 2.97 V ~ 3.63 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP 模塊（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 28-EDIP |
| 包裝： | 管件 |
DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs
6 of 16
CLOCK ACCURACY (PowerCap MODULE)
The DS1744 and DS9034PCX are individually tested for accuracy. Once mounted together, the module
typically keeps time accuracy to within ±1.53 minutes per month (35ppm) at +25°C. Clock accuracy is
also affected by the electrical environment and caution should be taken to place the RTC in the lowest-
level EMI section of the PC board layout. For additional information, refer to Application Note 58:
Crystal Considerations with Maxim Real-Time Clocks.
Table 2. Register Map
ADDRESS
DATA
FUNCTION RANGE
B7
B6
B5
B4
B3
B2
B1
B0
7FFF
10 Year
Year
00-99
7FFE
X
10
Month
01-12
7FFD
X
10 Date
Date
01-31
7FFC
BF
FT
X
Day
01-07
7FFB
X
10 Hour
Hour
00-23
7FFA
X
10 Minutes
Minutes
00-59
7FF9
OSC
10 Seconds
Seconds
00-59
7FF8
W
R
10 Century
Century
00-39
OSC
= Stop Bit
R = Read Bit
FT = Frequency Test
W = Write Bit
X = See Note
BF = Battery Flag
Note: All indicated “X” bits are not used but must be set to a “0” during write cycle to ensure proper clock operation.
RETRIEVING DATA FROM RAM OR CLOCK
The DS1744 is in the read mode whenever OE (output enable) is low, WE (write enable) is high, and
CE (chip enable) is low. The device architecture allows ripple-through access to any of the address
locations in the NV SRAM. Valid data is available at the DQ pins within tAA after the last address input is
stable, providing that the CE and OE access times and states are satisfied. If CE or OE access times and
states are not met, valid data is available at the latter of chip-enable access (tCEA) or at output-enable access
time (tOEA). The state of the DQ pins is controlled by CE and OE . If the outputs are activated before tAA,
the data lines are driven to an intermediate state until tAA. If the address inputs are changed while CE and
OE remain valid, output data remains valid for output-data hold time (tOH) but then goes indeterminate
until the next address access.
WRITING DATA TO RAM OR CLOCK
The DS1744 is in the write mode whenever WE and CE are in their active state. The start of a write is
referenced to the latter occurring transition of WE or CE . The addresses must be held valid throughout
the cycle. CE or WE must return inactive for a minimum of tWR prior to the initiation of another read or
write cycle. Data in must be valid tDS prior to the end of write and remain valid for tDH afterward. In a
typical application, the OE signal is high during a write cycle. However, OE can be active provided that
care is taken with the data bus to avoid bus contention. If OE is low prior to WE transitioning low, the
data bus can become active with read data defined by the address inputs. A low transition on WE then
disables the output tWEZ after WE goes active.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1315N-5 | IC T-CHIP PHANTOM 5V IND 16-DIP |
| DS12C887A | IC RTC W/RAM 128 BYTE 24-EDIP |
| DS12885TN | IC RTC W/RAM 128 BYTE 32-TQFP |
| VE-21K-MW | CONVERTER MOD DC/DC 40V 100W |
| DS1244WP-120IND | IC NVSRAM 256KBIT 120NS 34PCM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1744W-120+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1744W-120IND | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1744W-120IND+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1744WP-120 | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1744WP-120+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。