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參數(shù)資料
| 型號： | DS1308U-18+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 0K |
| 描述： | IC RTC 56BYTE NVRAM I2C 8UMAX |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 時鐘/日歷 |
| 特點： | 閏年，NVSRAM，方波輸出 |
| 存儲容量： | 56B |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 1.71 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 管件 |
DS1308
Low-Current I2C RTC with 56-Byte NV RAM
15
Maxim Integrated
impractical, the following method should be used to
perform reads from a specified memory location.
Manipulating the Address Counter for Reads: A
dummy write cycle can be used to force the address
counter to a particular value. To do this the mas-
ter generates a START condition, writes the slave
address byte (R/W = 0), writes the memory address
where it desires to read, generates a repeated START
condition, writes the slave address byte (R/W = 1),
reads data with ACK or NACK as applicable, and
generates a STOP condition. See Figure 7 for a read
example using the repeated START condition to
specify the starting memory location.
Reading Multiple Bytes From a Slave: The read
operation can be used to read multiple bytes with a
single transfer. When reading bytes from the slave,
the master simply ACKs the data byte if it desires to
read another byte before terminating the transaction.
After the master reads the last byte it must NACK to
indicate the end of the transfer and then it generates
a STOP condition.
Bus Timeout
To avoid an unintended I2C interface timeout, SCL
should not be held low longer than tTIMEOUTMIN. The
I2C interface is in the reset state and can receive a
new START condition when SCL is held low for at least
tTIMEOUTMAX. When the part detects this condition, SDA
is released and allowed to float. For the timeout function to
work, the oscillator must be enabled and running.
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS1308,
decouple the VCC power supply with a 0.01FF and/or
0.1FF capacitor. Use a high-quality, ceramic, surface-
mount capacitor if possible. Surface-mount components
minimize lead inductance, which improves performance,
and ceramic capacitors tend to have adequate high-
frequency response for decoupling applications.
Using Open-Drain Outputs
The SQW/CLKIN output is open drain and therefore
requires an external pullup resistor to realize a logic-high
output level.
SDA and SCL Pullup Resistors
SDA is an open-drain output and requires an external
pullup resistor to realize a logic-high output level.
Because the DS1308 does not use clock cycle stretch-
ing, a master using either an open-drain output with a
pullup resistor or CMOS output driver (push-pull) could
be used for SCL.
Battery Charge Protection
The DS1308 contains Maxim’s redundant battery-charge
protection circuit to prevent any charging of an exter-
nal battery. The DS1308 is recognized by Underwriters
Laboratories (UL) under file E141114.
Handling, PCB Layout, and Assembly
Avoid running signal traces under the package, unless
a ground plane is placed between the package and the
signal line.
The lead(Pb)-free/RoHS package can be soldered using
a reflow profile that complies with JEDEC J-STD-020.
Moisture-sensitive packages are shipped from the fac-
tory dry-packed. Handling instructions listed on the pack-
age label must be followed to prevent damage during
reflow. Refer to the IPC/JEDEC J-STD-020 standard for
moisture-sensitive device (MSD) classifications.
Chip Information
PROCESS: CMOS
SUBSTRATE CONNECTED TO GROUND
Ordering Information
Package Information
For the latest package outline information and land patterns (foot-
prints), go to www.maximintegrated.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
PART
TEMP RANGE
PIN-PACKAGE
DS1308U-18+
-40NC to +85NC
8 FSOP
DS1308U-3+*
-40NC to +85NC
8 FSOP
DS1308U-33+
-40NC to +85NC
8 FSOP
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 SOP
U8+1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1308U-18+ | 功能描述:實時時鐘 LOW CUR 1.8V I2C 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| DS1308U-18+T | 功能描述:實時時鐘 LOW CUR 1.8V I2C 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| DS1308U-3 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Current I2C RTC with 56-Byte NV RAM |
| DS1308U-3+ | 功能描述:實時時鐘 LOW CUR 3V I2C 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 時間格式:HH:MM:SS RTC 存儲容量: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 |
| DS1308U-3+T | 功能描述:實時時鐘 LOW CUR 3V I2C 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 時間格式:HH:MM:SS RTC 存儲容量: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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