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参数资料
| 型号： | DS1500W |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | REAL TIME CLOCK, PDIP32 |
| 封装： | DIP-32 |
| 文件页数： | 20/25页 |
| 文件大小： | 214K |
| 代理商： | DS1500W |
DS1500/DS1510
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RTC DATA READ MODE
The DS1500/DS1510 is in the read mode whenever CS (chip select) is low and WE (write enable) is high.
The device architecture allows ripple through access to any valid address location. Valid data will be
available at the DQ pins within t
AA (Address Access) after the last address input is stable, providing that
CS
and OE access times are satisfied. If CS or OE access times are not met, valid data will be 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 CS and OE . If the outputs are activated before t
AA, the data lines
are driven to an intermediate state until t
AA.
If the address inputs are changed while CS and OE remain
valid, output data will remain valid for output data hold time (t
OH) but will then go indeterminate until the
next address access. (See Table 1.)
RTC DATA WRITE MODE
The DS1500/DS1510 is in the write mode whenever WE and CS are in their active state. The start of a
write is referenced to the latter occurring transition of WE or CS . The addresses must be held valid
throughout the cycle. CS 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
t
DH afterward. In a typical application, the OE signal will be 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 will then disable the outputs t
WEZ 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 VCCI is greater than VPF.
However, when V
CCI falls below the power fail point VPF (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 ‘don’t cares’ and outputs go to a high-Z state with the exception of VCCO, CEO , and the possible
exception of KS , PWR , SQW, and RST . When V
CCI falls below the greater of VBAT or VBAUX, device
power is switched from the V
CCI pin to the greater of VBAT or VBAUX. RTC operation and external SRAM
data are maintained from the battery until V
CCI is returned to nominal levels. (See Table 1.)
The 3.3 volt device is fully accessible and data can be written and read only when VCCI is greater than
VPF. However, when V
CCI falls below VPF, access to the device is inhibited. If VPF is less than VBAT and
VBAUX, the device power is switched from VCCI to the greater of VBAT and VBAUX when VCCI drops below
VPF. If VPF is greater than VBAT and VBAUX, the device power is switched from VCCI to the greater of VBAT
and VBAUX when VCCI drops below the greater of VBAT and VBAUX. RTC operation and external SRAM
data are maintained from the battery until V
CCI is returned to nominal levels. (See Table 1.)
All control, data, and address signals must be no more than 0.3 volts above VCCI.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1500WN | REAL TIME CLOCK, PDIP32 |
| DS1500YE | REAL TIME CLOCK, PDSO32 |
| DS1500YEN | REAL TIME CLOCK, PDSO32 |
| DS1500YN | REAL TIME CLOCK, PDIP32 |
| DS1501WN | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1500WE | 功能描述:实时时钟 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 |
| DS1500WE+ | 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 |
| DS1500WEN | 功能描述:IC RTC Y2KC W/NV CTRL 32-TSOP 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 |
| DS1500WEN+ | 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 |
| DS1500WN | 功能描述:IC RTC Y2KC W/NV CTRL 32-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 |
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