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参数资料
| 型号： | DS1501 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Y2KC Watchdog Real Time Clock(Y2KC看门狗实时时钟) |
| 中文描述： | Y2K兼容、看门狗实时时钟 |
| 文件页数： | 4/22页 |
| 文件大小： | 178K |
| 代理商： | DS1501 |
DS1501/DS1511
071098 4/22
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 will then dis-
able the outputs t
WEZ
(WE data off time) after WE goes
active. (See Table 1.)
DATA RETENTION MODE
The 5–volt device is fully accessible and data can be
written and read only when V
CC
is greater than V
PF
.
However, when V
CC
falls below the power fail point V
PF
(point at which write protection occurs) the internal clock
registers and SRAM are blocked from any access.
While in the data retention mode, all inputs are dont
cares and outputs go to a high–Z state. When V
CC
falls
below the greater of V
BAT
and V
BAUX
, device power is
switched from the V
CC
pin to either the V
BAT
or V
BAUX
pin. RTC operation and SRAM data are maintained
from the battery until V
CC
is returned to nominal levels.
The 3.3–volt device is fully accessible and data can be
written and read only when V
CC
is greater than V
PF
.
However, when V
CC
falls below V
PF
, access to the
device is inhibited. If V
PF
is less than V
BAT
and V
BAUX
,
the device power is switched from V
CC
to the greater of
V
BAT
and V
BAUX
when V
CC
drops below V
PF
. If V
PF
is
greater than V
BAT
and V
BAUX
, the device power is
switched from V
CC
to the larger of V
BAT
and V
BAUX
when V
CC
drops below the larger of V
BAT
and V
BAUX
.
RTC operation and SRAM data are maintained from the
battery until V
CC
is returned to nominal levels. (See
Table 1.)
All control, data, and address signals must be powered
down when V
CC
is absent.
AUXILIARY BATTERY
The V
BAUX
input is provided to supply power from an
auxiliary battery for the DS1501/DS1511 kickstart and
SQW output features in the absence of V
CC
. This power
source must be available in order to use these auxiliary
features when V
CC
is not applied to the device.
This auxiliary battery may be used as the primary
backup power source for maintaining the clock/calen-
dar and extended user RAM. This occurs if the V
BAT
pin
is at a lower voltage than V
BAUX
. If the DS1501/DS1511
is to be backed–up using a single battery with the auxil-
iary features enabled, then V
BAUX
should be used and
V
BAT
should be grounded. If V
BAUX
is not to be used, it
should be grounded.
POWER ON RESET
A temperature compensated comparator circuit moni-
tors the level of V
CC
. When V
CC
falls to the write protec-
tion voltage, the RST signal (open drain) is pulled low.
When V
CC
returns to nominal levels, the RST signal
continues to be pulled low for a period of 40 ms to
200 ms. The power on reset function is independent of
the RTC oscillator and thus is operational whether or not
the oscillator is enabled.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1501_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Y2K-Compliant Watchdog Real-Time Clocks |
| DS1501-7R | 功能描述:EURO-CASSETTE 100W 15V RoHS:否 类别:电源 - 外部/内部（非板载） >> DC DC Converters 系列:* 标准包装:1 系列:Quint 类型:隔离 输入电压:24V 输出:24V 输出数:1 输出 - 1 @ 电流（最大）:24 VDC @ 50A 输出 - 2 @ 电流（最大）:- 输出 - 3 @ 电流（最大）:- 输出 - 4 @ 电流（最大）:- 功率（瓦特）:1200W 安装类型:底座安装 工作温度:0°C ~ 40°C 效率:- 封装/外壳:模块 尺寸/尺寸:4.33" L x 9.09" W x 6.14" H（110mm x 231mm x 156mm） 包装:散装 电源（瓦特）- 最大:1200W 批准:- 其它名称:277-69722866365-NDQUINT-BAT/24DC/12AH |
| DS1501-DS1511 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Y2K-Compliant Watchdog Real-Time Clocks |
| DS1501W | 功能描述:IC RTC WDOG Y2KC 3.3V 28-DIP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1501W+ | 功能描述:实时时钟 Y2K-Compliant Watchdog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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