參數(shù)資料
型號(hào)： DS1501WSN
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： Timer or RTC
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO28
封裝： 0.330 INCH, SOIC-28
文件頁(yè)數(shù)： 3/26頁(yè)
文件大?。?/td> 381K
代理商： DS1501WSN
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
11 of 21
DETAILED DESCRIPTION
The RTC registers are double buffered into an internal and external set. The user has direct access to the external
set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow the user to access
static data. When the crystal oscillator is turned on, the internal set of registers are continuously updated; this
occurs regardless of external register settings to guarantee that accurate RTC information is always maintained.
The DS1501/DS1511 contain their own power-fail circuitry that automatically deselects the device when the VCC
supply falls below a power-fail trip point. This feature provides a high degree of data security during unpredictable
system operation caused by low VCC levels.
The DS1501/DS1511 have interrupt (
IRQ), power control (PWR), and reset (RST) outputs that can be used to
control CPU activity. The
IRQ interrupt or RST outputs can be invoked as the result of a time-of-day alarm, CPU
watchdog alarm, or a kickstart signal. The DS1501/DS1511 power-control circuitry allow the system to be powered
on by an external stimulus, such as a keyboard or by a time and date (wakeup) alarm. The
PWR output pin can be
triggered by one or either of these events, and can be used to turn on an external power supply. The
PWR pin is
under software control, so that when a task is complete, the system power can then be shut down. The
DS1501/DS1511 power-on reset can be used to detect a system power-down or failure and hold the CPU in a safe
reset state until normal power returns and stabilizes; the
RST output is used for this function.
The DS1501/DS1511 are clock/calendar chips with the features described above. An external crystal and battery
are the only components required to maintain time-of-day and memory status in the absence of power.
Table 1. RTC Operating Modes
VCC
CE
OE
WE
DQ0–DQ7
A0–A4
MODE
POWER
V
IH
X
High-Z
X
Deselect
Standby
V
IL
X
V
IL
D
IN
A
IN
Write
Active
V
IL
V
IL
V
IH
D
OUT
A
IN
Read
Active
In tolerance
V
IL
V
IH
V
IH
High-Z
A
IN
Read
Active
VSO < VCC < VPF
X
High-Z
X
Deselect
CMOS Standby
VCC < VSO < VPF
X
High-Z
X
Data Retention
Battery Current
DATA READ MODE
The DS1501/DS1511 are in read mode whenever
CE (chip enable) and OE (output enable) are low and WE (write
enable) is high. The device architecture allows ripple-through access to any valid address location. Valid data is
available at the DQ pins within t
AA (address access) after the last address input is stable, provided that CE and OE
access times are satisfied. If
CE or OE access times are not met, valid data is available at the latter of chip-enable
access (t
CSA) or at output-enable access time (tOEA). The state of the data input/output pins (DQ) is controlled by CE
and
OE. If the outputs are activated before t
AA, 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 (t
OH)
but then goes indeterminate until the next address access (Table 1).
DATA WRITE MODE
The DS1501/DS1511 are in write mode whenever
CE and WE are in their active state. The start of a write is
referenced to the latter occurring transition of
CE or WE. The addresses must be held valid throughout the cycle.
CE or WE must return inactive for a minimum of t
WR prior to the initiation of a subsequent read or write cycle. Data
in must be valid t
DS prior to the end of the 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 a high-to-low transition on WE, the data bus can become active with read data
defined by the address inputs. A low transition on
WE then disables the outputs t
WEZ after WE goes active (Table 1).
相關(guān)PDF資料
PDF描述
DS1501YEN 1 TIMER(S), REAL TIME CLOCK, PDSO28
DS1501YSN 1 TIMER(S), REAL TIME CLOCK, PDSO28
DS1511W 1 TIMER(S), REAL TIME CLOCK, DMA28
DS1511Y 1 TIMER(S), REAL TIME CLOCK, DMA28
DS1501YE 1 TIMER(S), REAL TIME CLOCK, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1501WSN/T&R 制造商:Maxim Integrated Products 功能描述:IC RTC WDOG Y2KC 3.3V IND 28SOIC
DS1501WSN/T&R 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
DS1501WSN+ 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
DS1501WSN+T&R 制造商:Maxim Integrated Products 功能描述:MAXIM DS1501WSN+T&R REAL TIME CLOCKS (RTC) - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim DS1501WSN+T&R Real Time Clocks (RTC) 制造商:Maxim Integrated Products 功能描述:IC RTC WDOG Y2K 3.3V IND 28SOIC
DS1501WSN+T&R 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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*