- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄97858 > DS1244Y-70 (DALLAS SEMICONDUCTOR) 0 TIMER(S), REAL TIME CLOCK, PDMA28 PDF資料下載
參數(shù)資料
| 型號： | DS1244Y-70 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDMA28 |
| 封裝： | 0.740 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 273K |
| 代理商： | DS1244Y-70 |
DS1244/DS1244P
2 of 19
ORDERING INFORMATION
DS1244YP–XXX (5 Volt)
-70
70 ns access
-100 100 ns access
blank
28-pin DIP Module
P
34-pin PowerCap Module
board*
DS1244WP-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)
PIN DESCRIPTION
A0–A14
– Address Inputs
CE
– Chip Enable
OE
– Output Enable
WE
– Write Enable
VCC
– Power Supply Input
GND
– Ground
DQ0–DQ7
– Data In/Data Out
NC
– No Connection
X1,X2
– Crystal Connection
VBAT
– Battery Connection
RST
– Reset
DESCRIPTION
The DS1244 256K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 32K
words by 8 bits) with a built–in real time clock. The DS1244 has a self–contained lithium energy source
and control circuitry which constantly monitors VCC for an out–of–tolerance condition. When such a
condition occurs, the lithium energy source is automatically switched on and write protection is
unconditionally enabled to prevent garbled data in both the memory and real time clock.
The Phantom Clock provides timekeeping information including hundredths of seconds, seconds,
minutes, hours, day, date, month, and year information. The date at the end of the month is automatically
adjusted for months with less than 31 days, including correction for leap years. The Phantom Clock
operates in either 24–hour or 12–hour format with an AM/PM indicator.
PACKAGES
The DS1244 is available in two packages (28–pin DIP and 34–Pin PowerCap module). The 28–pin DIP
style module integrates the crystal, lithium energy source, and silicon all in one package. The 34–pin
PowerCap Module Board is designed with contacts for connection to a separate PowerCap (DS9034PCX)
that contains the crystal and battery. This design allows the PowerCap to be mounted on top of the
DS1244P after the completion of the surface mount process. Mounting the PowerCap after the surface
mount process prevents damage to the crystal and battery due to the high temperatures required for solder
reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap Module Board and PowerCap
are ordered separately and shipped in separate containers. The part number for the Powercap is
DS9034PCX.
RAM READ MODE
The DS1244 executes a read cycle whenever WE(Write Enable) is inactive (high) and CE (Chip Enable)
is active (low). The unique address specified by the 15 address inputs (A0–A14) defines which of the
32,768 bytes of data is to be accessed. Valid data will be available to the eight data output drivers within
tACC (Access Time) after the last address input signal is stable, providing that CE and OE (Output Enable)
access times and states are also satisfied. If OE and CE access times are not satisfied, then data access
must be measured from the later occurring signal (CE or OE) and the limiting parameter is either tCO for
CE or tOE for OE rather than address access.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1244Y | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| DS1245AB-100 | 128K X 8 NON-VOLATILE SRAM MODULE, 100 ns, DMA32 |
| DS1245Y-120 | 128K X 8 NON-VOLATILE SRAM MODULE, 120 ns, DMA32 |
| DS1245AB-85 | 128K X 8 NON-VOLATILE SRAM MODULE, 85 ns, DMA32 |
| DS1245Y-85 | 128K X 8 NON-VOLATILE SRAM MODULE, 85 ns, DMA32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1244Y-70+ | 功能描述:實時時鐘 256k NV SRAM w/Phantom Clock 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 |
| DS1244YP/WP | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:PowerCap with Crystal |
| DS1244YP-70 | 功能描述:IC NVSRAM 256KBIT 70NS 34PCM RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件 |
| DS1244YP-70+ | 功能描述:實時時鐘 256k NV SRAM w/Phantom Clock 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 |
| DS-1244ZJ | 制造商:Hikvision USA 功能描述:DOME CAM CEILING TRIM BRACKET4.75IN X .95IN 制造商:HIKVISION 功能描述:DOME CAM CEILING TRIM BRACKET 4.75IN X .95IN |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。