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參數(shù)資料
| 型號： | DS14285SN |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| 封裝： | 0.300 INCH, SOP-24 |
| 文件頁數(shù)： | 21/26頁 |
| 文件大小： | 515K |
| 代理商： | DS14285SN |
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DS14285/DS14287
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MOT (Mode Select) - The MOT pin offers the flexibility to choose between to bus types. When
connected to VCC, Motorola bus timing is selected. When connected to GND or left disconnected, Intel
bus timing is selected. The pin has an internal pull-down resistance of approximately 20 K
. This pin is
on the DS14285Q only.
AS (Address Strobe Input) - A positive going address strobe pulse serves to demultiplex the bus. The
falling edge of AS/ALE causes the address to be latched within the DS14285/DS14287.
DS (Data Strobe or Read Input) - For the DS14285Q the DS/ RD pin has two modes of operation
depending on the level of the MOT pin. When the MOT pin is connected to VCC, Motorola bus timing is
selected. In this mode DS is a positive pulse during the latter portion of the bus cycle and is called Data
Strobe. During read cycles, DS signifies the time that the DS14285Q is to drive the bidirectional bus. In
write cycles the trailing edge of DS causes the DS14285Q to latch the written data. When the MOT pin is
connected to GND, Intel bus timing is selected. In this mode the DS pin is called Read( RD ). RD identifies
the time period when the DS14285Q drives the bus with read data. The RD signal is the same definition
as the Output Enable ( OE ) signal on a typical memory.
The DS14285, DS14285S and DS14287 do not have a MOT pin and therefore operate only in Intel bus
timing mode.
R/ W (Read/Write Input) - The R/ W pin also has two modes of operation. When the MOT pin is
connected to VCC for Motorola timing, R/ W is at a level which indicates whether the current cycle is a
read or write. A read cycle is indicated with a high level on R/ W while DS is high. A write cycle is
indicated when R/ W is low during DS.
When the MOT pin is connected to GND for Intel timing, the R/ W signal is an active low signal called
WR
. In this mode the R/ W pin has the same meaning as the Write Enable signal ( WE ) on generic
RAMs.
CS
(Chip Select Input) - The Chip Select signal must be asserted low for a bus cycle in the
DS14285/DS14287 to be accessed. CS must be kept in the active state during DS for Motorola timing
and during RD and WR for Intel timing. Bus cycles which take place without asserting CS will latch
addresses but no access will occur. When VCC is below 4.25 volts, the DS14285/DS14287 internally
inhibits access cycles by internally disabling the CS input. This action protects both the real time clock
data and RAM data during power outages.
IRQ
(Interrupt Request Output) - The IRQ pin is an active low output of the DS14285/DS14287 that
can be used as an interrupt input to a processor. The IRQ output remains low as long as the status bit
causing the interrupt is present and the corresponding interrupt-enable bit is set. To clear the IRQ pin the
processor program normally reads the C register. The RESET pin also clears pending interrupts.
When no interrupt conditions are present, the IRQ level is in the high impedance state. Multiple
interrupting devices can be connected to an IRQ bus. The IRQ bus is an open drain output and requires an
external pull-up resistor.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS14285Q | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| DS14285 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1670S | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| DS14287 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1670E | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS14285SN/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL IND 24SOIC |
| DS14285SN/T&R | 功能描述:IC RTC W/NV RAM CNTRL IND 24SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)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(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 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 |
| DS14285SN/TR | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Real-Time Clock with NV RAM |
| DS14285SN+ | 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 |
| DS14285SN+T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC 制造商:DSC 功能描述: |
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