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參數(shù)資料
| 型號(hào)： | DS1374C-3# |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC I2C W/CHARGER 16-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 45 |
| 類型： | 二進(jìn)制計(jì)數(shù)器 |
| 特點(diǎn)： | 警報(bào)器，方波輸出，涓流充電器，監(jiān)視計(jì)時(shí)器 |
| 時(shí)間格式： | 二進(jìn)制 |
| 數(shù)據(jù)格式： | 二進(jìn)制 |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 3.3 V |
| 電壓 - 電源，電池： | 1.3 V ~ 3.7 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 管件 |
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Detailed Description
The DS1374 is a real-time clock with an I2C serial inter-
face. It provides elapsed seconds from a user-defined
starting point in a 32-bit counter (Figure 4). A 24-bit
counter can be configured as either a watchdog
counter or an alarm counter. An on-chip oscillator cir-
cuit uses a customer-supplied 32.768kHz crystal to
keep time. A power-control circuit switches operation
from VCC to VBACKUP and back when power on VCC is
cycled. The oscillator and counters continue to operate
when powered by either supply. If a rechargeable
backup supply is used, a trickle charger can be
enabled to charge the backup supply while VCC is on.
Oscillator Circuit
The DS1374 uses an external 32.768kHz crystal. The
oscillator circuit does not require any external resistors
or capacitors to operate. Table 1 specifies several crys-
tal parameters for the external crystal. Figure 5 shows a
functional schematic of the oscillator circuit. The startup
time is usually less than 1 second when using a crystal
with the specified characteristics.
Clock Accuracy
Clock accuracy 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 tempera-
ture shifts. External circuit noise coupled into the oscilla-
tor circuit can result in the clock running fast. Figure 6
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.
DS1374C Only
The DS1374C integrates a standard 32,768Hz crystal
into the package. Typical accuracy at nominal VCC and
25°C is approximately 10ppm. See
Application Note 58
for information about crystal accuracy vs. temperature.
DS1374
I2C, 32-Bit Binary Counter Watchdog RTC with
Trickle Charger and Reset Input/Output
_____________________________________________________________________
9
COUNTDOWN
CHAIN
X1
X2
CL1
CL2
CRYSTAL
RTC
REGISTERS
DS1374
Figure 5. Oscillator Circuit Showing Internal Bias Network
LOCAL GROUND PLANE (LAYER 2)
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.
CRYSTAL
GND
X2
X1
Figure 6. Layout Example
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Nominal
Frequency
fO
32.768
kHz
Series
Resistance
ESR
45
k
Ω
Load
Capacitance
CL
6pF
Table 1. 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 addi-
tional specifications.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1374C-3# | 功能描述:實(shí)時(shí)時(shí)鐘 I2C 32-Bit Binary Counter Watchdog 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 |
| DS1374C-3#T&R | 制造商:Maxim Integrated Products 功能描述:2-WIRE ETC W/CRYSTAL 3V ROHS T/R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C 32BIT 3.0V 16-SOIC 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C 32-Bit Binary Counter Watchdog |
| DS1374C-3#T&R | 功能描述:實(shí)時(shí)時(shí)鐘 I2C 32-Bit Binary Counter Watchdog 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 |
| DS1374C-33 | 功能描述:實(shí)時(shí)時(shí)鐘 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 |
| DS1374C-33- | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output |
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