参数资料
| 型号： | DS1390U-33+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/26页 |
| 文件大小： | 0K |
| 描述： | IC RTC W/CHARGER 10-USOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，涓流充电器 |
| 时间格式： | HH:MM:SS:hh（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 电源电压： | 2.97 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
| 产品目录页面： | 1434 (CN2011-ZH PDF) |
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
13
Maxim Integrated
Power Control
The power-control function is provided by a precise,
temperature-compensated voltage reference and a
comparator circuit that monitors the VCC level. The
device is fully accessible and data can be written and
read when VCC is greater than VPF. However, when
VCC falls below VPF, the internal clock registers are
blocked from any access. If VPF is less than VBACKUP,
the device power is switched from VCC to VBACKUP
when VCC drops below VPF. If VPF is greater than
VBACKUP, the device power is switched from VCC to
VBACKUP when VCC drops below VBACKUP.
Timekeeping operation and register data are main-
tained from the VBACKUP source until VCC is returned to
nominal levels (Table 1). After VCC returns above VPF,
read and write access is allowed after RST goes high
(Figure 5).
Oscillator Circuit
All five devices use 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. If a crystal is
used with the specified characteristics, the startup time
is usually less than one second.
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 7 shows a typical PC board layout
for isolation of the crystal and oscillator from noise.
Refer to Application Note 58:
Crystal Considerations
with Maxim Real-Time Clocks for detailed information.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Nominal Frequency
fO
32.768
kHz
Series Resistance
ESR
55
k
Load Capacitance
CL
6pF
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 Maxim Real-Time Clocks
for addi-
tional specifications.
SUPPLY
CONDITION
READ/WRITE
ACCESS)
POWERED BY
VCC < VPF,
VCC < VBACKUP
No
VBACKUP
VCC < VPF,
VCC > VBACKUP
No
VCC
VCC > VPF,
VCC < VBACKUP
Yes
VCC
VCC > VPF,
VCC > VBACKUP
Yes
VCC
Table 1. Power Control
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 7. Layout Example
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1390U-33/V+ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1390U-33/V+T | 制造商:Maxim Integrated Products 功能描述:SERIAL RTC 3.3V USOP PBFREE T&R AUTOMOTIVE - Tape and Reel |
| DS1390U-33+ | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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 |
| DS1390U-33+T&R | 制造商:Maxim Integrated Products 功能描述:SERIAL RTC 33V USOP 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC W/CHARGER 10-USOP 制造商:Maxim Integrated Products 功能描述:IC RTC W/CHARGER 10USOP |
| DS1390U-33+T&R | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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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