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參數(shù)資料
| 型號： | DS1284 |
| 英文描述： | Watchdog Timekeeper Chip |
| 中文描述： | 看門狗計時器 |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 143K |
| 代理商： | DS1284 |
DS1284
2 of 3
PIN DESCRIPTION
X1, X2 -
Connections for a standard 32.768 kHz quartz crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (C
L
) of 6 pF. The crystal is
connected directly to the X1 and X2 pins. There is no need for external capacitors or resistors. For more
information on crystal selection and crystal layout considerations, please consult Application Note 58,
“Crystal Considerations with Dallas Real Time Clocks.”
V
BAT
- Battery input for any standard 3-volt lithium cell or other energy source. Battery voltage must be
held between 2.4 and 3.7 volts for proper operation. The nominal write-protect trip point voltage at which
access to registers containing time, watchdog, alarm, and RAM information is denied is set by internal
circuitry as 1.26 x V
BAT
. A maximum load of 0.5
μ
A at 25°C in the absence of power should be used to
size the external energy source. The battery should be connected directly to the V
BAT
pin. A diode must
not be placed in series with the battery to the V
BAT
pin. Furthermore, a diode is not necessary because
reverse charging current protection circuitry is provided internal to the device and has passed the
requirements of Underwriters Laboratories for UL listing. An optional ground pin is provided for
connection to battery negative. This pin should be grounded but can be left floating.
RCLR
- The
RCLR
pin is used to clear (set to logic 1) all 50 bytes of user NV RAM but does not affect
the registers involved with time, alarm, and watchdog functions. In order to clear the RAM,
RCLR
must
be forced to an input logic 0 (-0. 3 to +0.8 volts) during battery back-up mode when V
CC
is not applied.
The
RCLR
function is designed to be used via human interface (shorting to ground or by switch) and not
be driven with external buffers. This pin is internally pulled up and should be left floating when not in
use.
DS1284Q 28-PIN PLCC WATCHDOG TIMEKEEPER
PKG
DIM
A IN.
MM
B IN.
MM
D IN.
MM
D2 IN.
MM
E IN.
MM
E2 IN.
MM
F IN.
MM
H IN.
MM
28-PIN
MIN
0.300 BSC
7.62
0.442
17.68
0.480
12.2
0.390
9.91
0.090
2.29
0.390
9.91
0.015
0.38
0.100
2.54
MAX
0.462
11.73
0.500
12.7
0.430
10.92
0.120
3.05
0.430
10.92
0.020
0.518
0.020
0.518
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1285 | Real Time Clock |
| DS1285Q | Real Time Clock |
| DS1286 | Watchdog Timekeeper |
| DS1287 | Real Time Clock |
| DS1345ABP-70-IND | GT 6C 2#8 4#16 SKT PLUG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1284+ | 功能描述:實時時鐘 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 |
| DS1284N | 功能描述:實時時鐘 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 |
| DS1284Q | 功能描述:實時時鐘 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 |
| DS1284Q/T&R | 制造商:Maxim Integrated Products 功能描述:IC TIMEKEEPER WATCHDOG 28-PLCC |
| DS1284Q/T&R | 功能描述:實時時鐘 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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