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參數(shù)資料
| 型號(hào)： | DS1307Z+T&R/C01 |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 12/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC SERIAL 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 閏年，NVSRAM，方波輸出 |
| 存儲(chǔ)容量： | 56B |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2 V ~ 3.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱(chēng)： | 90-1307Z+C01 |
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DS1307 64 x 8, Serial, I2C Real-Time Clock
7 of 14
OSCILLATOR CIRCUIT
The DS1307 uses an external 32.768kHz crystal. The oscillator circuit does not require any external resistors or
capacitors to operate. Table 1 specifies several crystal parameters for the external crystal. Figure 1 shows a
functional schematic of the oscillator circuit. If using a crystal with the specified characteristics, the startup time is
usually less than one second.
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 will be added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the
oscillator circuit may result in the clock running fast. Refer to Application Note 58: Crystal Considerations with
Dallas Real-Time Clocks for detailed information.
Table 1. Crystal Specifications*
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Nominal Frequency
fO
32.768
kHz
Series Resistance
ESR
45
k
Load Capacitance
CL
12.5
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 2. Recommended Layout for Crystal
RTC AND RAM ADDRESS MAP
Table 2 shows the address map for the DS1307 RTC and RAM registers. The RTC registers are located in address
locations 00h to 07h. The RAM registers are located in address locations 08h to 3Fh. During a multibyte access,
when the address pointer reaches 3Fh, the end of RAM space, it wraps around to location 00h, the beginning of
the clock space.
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.
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
X1
X2
GND
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|---|---|
| DS1308 | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Low-Current I2C RTC with 56-Byte NV RAM |
| DS1308N | 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:64 X 8 Serial Real Time Clock |
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| DS1308U-18+ | 功能描述:實(shí)時(shí)時(shí)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(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 |
| DS1308U-18+T | 功能描述:實(shí)時(shí)時(shí)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(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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