參數(shù)資料
型號(hào)： DS1284
英文描述： Watchdog Timekeeper Chip
中文描述： 看門狗計(jì)時(shí)器
文件頁(yè)數(shù)： 1/3頁(yè)
文件大小： 143K
代理商： DS1284
1 of 3
072799
FEATURES
§
Keeps track of hundredths of seconds,
seconds, minutes, hours, days, date of the
month, months, and years; valid leap year
compensation up to 2100
§
Watchdog timer restarts an out-of-control
processor
§
Alarm function schedules real-time related
activities
§
Programmable interrupts and square wave
outputs maintain 28-pin JEDEC footprint
§
All registers are individually addressable via
the address and data bus
§
Accuracy is better than ±2 minute/month at
25°C
§
50 bytes of user NV RAM
§
Optional 28-pin PLCC surface mount package
§
Low-power CMOS circuitry is maintained on
less than 0.5
μ
A when power is supplied from
battery input
§
Optional
industrial
available on 28-pin PLCC (-40°C to +85°C)
temperature
range
PIN ASSIGNMENT
PIN DESCRIPTION
INTA
INTB
(INTB) - Interrupt Output B (open drain)
A0-A5
- Address Inputs
DQ0-DQ7
- Data Input/Output
CE
- Chip Enable
OE
- Output Enable
WE
- Write Enable
V
CC
- +5 Volts
GND
- Ground
NC
- No Connection
SQW
- Square Wave Output
X1,X2
- 32.768 kHz Crystal Connections
V
BAT
- +3 Volt Battery Input
RCLR
- RAM Clear
- Interrupt Output A (open drain)
DESCRIPTION
The DS1284 Watchdog Timekeeper Chip is a self-contained real-time clock, alarm, watchdog timer, and
interval timer in a 28-pin JEDEC DIP package or a 28-pin PLCC surface mount package. An external
crystal and battery are the only components required to maintain time-of-day and memory status in the
absence of power. For a complete description of operating conditions, electrical characteristics, bus
timing, and pin descriptions other than X1, X2, V
BAT
, and
RCLR
, see the DS1286 Watchdog Timekeeper
data sheet.
DS1284
Watchdog Timekeeper Chip
www.dalsemi.com
DS1284
28-Pin DIP (600-mil)
DS1284
28-Pin PLCC
13
14
27
26
25
24
23
22
21
20
19
18
17
16
X2
NC
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
V
CC
WE
INTB(INTB)
V
BAT
RCLR
SQW
OE
GND
CE
DQ7
DQ6
DQ5
DQ4
DQ3
1
2
3
4
5
6
7
8
9
10
11
12
28
15
X1
INTA
A5
A4
A3
A2
A1
A0
VBAT
RCLR
SQW
OE
GND
CE
DQ7
DQ0
N
X
X
I
V
W
I
D
D
G
D
D
D
D
25
24
23
22
21
20
19
5
6
7
8
9
10
11
12 13 14 15 16 17 18
4 3 2 1 28 27 26
相關(guān)PDF資料
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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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