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參數(shù)資料
| 型號(hào)： | DS1339 |
| 英文描述： | Serial Real-Time Clock |
| 中文描述： | I²C串行實(shí)時(shí)時(shí)鐘 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大小： | 279K |
| 代理商： | DS1339 |
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DS1339 I
2
C Serial Real-Time Clock
9 of 18
Table 1. Crystal Specifications*
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Nominal Frequency
f
O
32.768
kHz
Series Resistance
ESR
45
k
Load Capacitance
C
L
6
pF
*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.
Figure 4. Oscillator Circuit Showing Internal Bias Network
CLOCK ACCURACY
The accuracy of the clock is dependent upon the accuracy 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 may result in the clock running fast. Figure 5 shows a typical PC board layout for isolating the
crystal and oscillator from noise. Refer to
Application Note 58: Crystal Considerations with Dallas Real-Time
Clocks
for detailed information
DS1339C ONLY
The DS1339C integrates a standard 32,768Hz crystal in the package. Typical accuracy at nominal V
CC
and +25°C
is approximately 10ppm. Refer to
Application Note 58
for information about crystal accuracy vs. temperature.
Figure 5. Typical PC Board Layout for Crystal
COUNTDOWN
CHAIN
RTC
REGISTERS
RTC
X1
X2
CRYSTAL
C
L
1
C
L
2
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
X1
X2
GND
NOTE:
AVOID ROUTING SIGNALS IN
THE CROSSHATCHED AREA (UPPER
LEFT-HAND QUADRANT) OF THE
PACKAGE UNLESS THERE IS A
GROUND PLANE BETWEEN THE
SIGNAL LINE AND THE PACKAGE.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1339C-3 | I2C Serial Real-Time Clock |
| DS1339C-33 | TRANS NPN 160V 350MW SMD SOT-23 |
| DS1339U-2 | Serial Real-Time Clock |
| DS1339U-3 | TRANS NPN BIPOL DUAL 160V SOT363 |
| DS1339U-33 | Serial Real-Time Clock |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1339_06 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:I2C Serial Real-Time Clock |
| DS1339_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:I2C Serial Real-Time Clock Trickle-Charge Capability |
| DS1339A | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Current, I2C, Serial Real-Time Clock |
| DS1339A_13 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Current, I2C, Serial Real-Time Clock |
| DS1339AD+ | 功能描述:實(shí)時(shí)時(shí)鐘 1.8-3.3V Serial RTC 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 |
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