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参数资料
| 型号： | DS1318E+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/15页 |
| 文件大小： | 0K |
| 描述： | IC COUNTER ELAPSED TIME 24-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 62 |
| 类型： | 耗用时间计数器 |
| 特点： | 警报器，方波输出 |
| 时间格式： | 二进制 |
| 数据格式： | 二进制 |
| 接口： | 并联 |
| 电源电压： | 3 V ~ 3.6 V |
| 电压 - 电源，电池： | 1.6 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1433 (CN2011-ZH PDF) |
DS1318
Parallel-Interface Elapsed Time Counter
_____________________________________________________________________
9
input current is IBAT. The oscillator consumes most of
the current. If the oscillator is disabled, the data in the
registers remain static, and the battery input current is
IBATDR, which is primarily due to the leakage of the sta-
tic memory cells.
The DS1318 uses a standard parallel byte-wide interface
to access the register map. Table 1 summarizes the
modes of operation at various power-supply conditions.
Oscillator Circuit
The DS1318 uses an external 32.768kHz crystal. The
oscillator circuit does not require any external resistors
or capacitors to operate. Table 2 specifies several crys-
tal parameters for the external crystal, and Figure 1
shows a functional schematic of the oscillator circuit.
An enable bit in the control register controls the oscilla-
tor. Oscillator startup times are highly dependent upon
crystal characteristics, PC board leakage, and layout.
High ESR and excessive capacitive loads are the major
contributors to long startup times. A circuit using a
crystal with the recommended characteristics and
proper layout usually starts within one second.
An external 32.768kHz oscillator can also drive the
DS1318. In this configuration, the X1 pin is connected
to the external oscillator signal and the X2 pin is left
unconnected.
Clock Accuracy
The accuracy of the clock is dependent upon the accu-
racy of the crystal and the accuracy of the match
between the capacitive load of the oscillator circuit and
the capacitive load for which the crystal was trimmed.
Additional error is added by crystal frequency drift
caused by temperature shifts. External circuit noise
coupled into the oscillator circuit can result in the clock
running fast. Figure 2 shows a typical PC board layout
for isolation of the crystal and oscillator from noise. Refer
to
Application Note 58: Crystal Considerations with
Dallas Real-Time Clocks for more detailed information.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Nominal Frequency
f
O
32.768
kHz
Series Resistance
ESR
50
k
Ω
Load Capacitance
C
L
12.5
pF
Table 2. Crystal Specifications*
*
The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal
Considerations for Dallas Real-Time Clocks
for additional specifications.
COUNTDOWN CHAIN
RTC
X1
X2
CRYSTAL
CL1CL2
RTC REGISTERS
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
GND
X2
X1
NOTE: AVOID ROUTING SIGNAL LINES
IN THE CROSSHATCHED AREA
(UPPER LEFT QUADRANT) OF
THE PACKAGE UNLESS THERE IS
A GROUND PLANE BETWEEN THE
SIGNAL LINE AND THE DEVICE PACKAGE.
Figure 1. Oscillator Circuit Showing Internal Bias Network
Figure 2. Layout Example
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1318E/GG8 | 制造商:Maxim Integrated Products 功能描述:44 BIT PARALLEL INTFACE ETC 24P TSS - Rail/Tube |
| DS1318E+ | 功能描述:实时时钟 Parallel-Interface Elapsed Time Cntr 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 |
| DS1318E+T&R | 制造商:Maxim Integrated Products 功能描述:44 BIT PRLLEL INTFC ETC TRL LF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC COUNTER ELAPSED TIME 24TSSOP |
| DS1318E+T&R | 功能描述:实时时钟 PARALLEL-INTERFACE ELAPSED TIME COUNTER 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 |
| DS13-1Y | 功能描述:固态继电器-工业安装 RoHS:否 制造商:Crydom 控制电压范围:4 VDC to 32 VDC 负载电压额定值:7 VDC to 72 VDC 负载电流额定值:160 A 触点形式: 输出设备:SSR 安装风格:Panel |
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