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参数资料
| 型号： | DS1689SN |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, SOIC-28 |
| 文件页数： | 31/36页 |
| 文件大小： | 594K |
| 代理商： | DS1689SN |
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DS1689/DS1693
4 of 36
PIN
SO
EDIP
NAME
FUNCTION
24
SQW
Square-Wave Output. The SQW pin can output a signal from one of
13 taps provided by the 15 internal divider stages of the real time
clock. The frequency of the SQW pin can be changed by
programming Register A as shown in Table 2. The SQW signal can
be turned on and off using the SQWE bit in Register B. A 32kHz
SQW signal is output when SQWE = 1, the Enable 32kHz (E32K)
bit in extended register 04BH is logic 1, and VCC is above VPF. A
32kHz square wave is also available when VCC is less than VPF if
E32K = 1, ABE = 1, and voltage is applied to VBAUX.
25
VCCO
External SRAM Power-Supply Output. This pin is internally
connected to VCCI when VCCI is within nominal limits. However,
during power fail, VCCO is internally connected to the VBAT or VBAUX
(whichever is larger). For 5V operation, switchover from VCCI to the
backup supply occurs when VCCI drops below the larger of VBAT and
VBAUX. For 3V operation, switchover from VCCI to the backup supply
occurs at VPF if VPF is less than VBAT and VBAUX. If VPF is greater
than VBAT and VBAUX, the switch from VCCI to the backup supply
occurs when VCCI drops below the larger of VBAT and VBAUX.
26
VCCI
+3V or +5V Main Supply. DC power is provided to the device on
these pins. 5V operation is selected when the PSEL pin is at logic 1.
If PSEL is floated or at logic 0, the device is in autosense mode and
determines the correct operating voltage based on the VCCI voltage
level.
27
CEO
Active-Low RAM Chip Enable Output. When power is valid,
CEO
will equal
CEI. When power is not valid, CEO will be driven high
regardless of
CEI.
28
CEI
Active-Low RAM Chip Enable Input.
CEI should be driven low to
enable the external RAM.
—
2, 3,
19, 23
N.C.
No Connection
相关PDF资料 |
PDF描述 |
|---|---|
| DS1689S | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS1693 | 1 TIMER(S), REAL TIME CLOCK, PDMA28 |
| DS1689 | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| DS1720S+T&R | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
| DS1720S+ | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1689SN/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689SN/T | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control |
| DS1689SN/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC SER NV RAM CTRL IN 28SOIC |
| DS1689SN/T&R | 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 |
| DS1689SN+ | 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 |
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