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參數(shù)資料
| 型號(hào)： | DS1284 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | XO, clock |
| 英文描述： | Watchdog Timekeeper Chip(看門狗計(jì)時(shí)器芯片) |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 封裝： | 0.600 INCH, DIP-28 |
| 文件頁(yè)數(shù)： | 2/3頁(yè) |
| 文件大?。?/td> | 37K |
| 代理商： | DS1284 |
DS1284
022798 2/3
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 capaci-
tance (C
L
) of 6 pF. The crystal is connected directly to
the X1 and X2 pins. There is no need for external capac-
itors or resistors. For more information on crystal selec-
tion and crystal layout considerations, please consult
Application Note 58, “Crystal Considerations with Dal-
las Real Time Clocks”.
V
BAT
–
Battery input for any standard 3-volt lithium cell
or other energy source. Battery voltage must be held be-
tween 2.4 and 3.7 volts for proper operation. The nomi-
nal 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 nec-
essary because reverse charging current protection cir-
cuitry is provided internal to the device and has passed
the requirements of Underwriters Laboratories for UL
listing. An optional ground pin is provided for connec-
tion 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 regis-
ters involved with time, alarm, and watchdog functions.
In order to clear the RAM, RCLR must be forced to an
input logic zero (–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 buff-
ers. This pin is internally pulled up and should be left
floating when not in use.
DS1284Q 28–PIN PLCC WATCHDOG TIMEKEEPER
D
45Deg.
CL
D
E
F
H
A
B
B1
D2
DIM
MIN
MAX
28–PIN
PKG
MM
MM
D IN.
MM
MM
MM
E2 IN.
MM
MM
MM
0.442
0.462
0.480
12.2
0.500
12.7
0.390
0.430
0.090
0.120
0.390
9.91
0.430
10.92
0.015
0.020
0.100
0.020
7.62
E2
A3
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1286 | Watchdog Timekeeper(看門狗計(jì)時(shí)器芯片) |
| DS1287A | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
| DS1287 | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
| DS12885 | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
| DS12885Q | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1284+ | 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 |
| DS1284N | 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 |
| DS1284Q | 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 |
| 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(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 |
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