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參數(shù)資料
| 型號(hào)： | DS14285S |
| 英文描述： | Real Time Clock with NV RAM Control |
| 中文描述： | 實(shí)時(shí)時(shí)鐘的非易失RAM控制 |
| 文件頁數(shù)： | 2/25頁 |
| 文件大?。?/td> | 303K |
| 代理商： | DS14285S |
DS14285/DS14287
2 of 25
ORDERING INFORMATION
DS14285
DS14285N
DS14285S
DS14285SN
DS14285Q
DS14285QN
DS14287
RTC Chip; 24-pin DIP
RTC Chip; 24-pin DIP; Industrial Temp Range
RTC Chip; 24-pin SOIC
RTC Chip; 24-pin SOIC; Industrial Temp Range
RTC Chip; 28-pin PLCC
RTC Chip; 28-pin PLCC; Industrial Temp Range
RTC Module; 24-pin DIP
PIN DESCRIPTION
AD0-AD7
NC
MOT
- Multiplexed Address/Data Bus
- No Connection
- Bus Type Select (DS14285Q only)
- Chip Select
- Address Strobe
- Read/Write Input
- Data Strobe
- Reset Input
- Interrupt Request Output
- Square Wave Output
- +5V Supply
- Ground
- RAM Power Supply Output
- RAM Chip Enable In
- RAM Chip Enable Out
- 32.768 kHz Crystal Connections
- +3V Battery Input
CS
AS
R/
W
DS
RESET
IRQ
SQW
V
CC
GND
V
CCO
CEI
CEO
X1, X2
V
BAT
DESCRIPTION
The DS14285/DS14287 Real Time Clock with NVRAM Control provides the industry standard DS1287
clock function with the additional feature of providing nonvolatile control for an external SRAM.
Functions include a nonvolatile time-of-day clock, alarm, 100-year calendar, programmable interrupt,
square wave generator, and 114 bytes of nonvolatile static RAM. For the DS14287 a lithium energy
source, quartz crystal, and write protection circuitry are contained within a 24-pin dual in-line package.
The DS14285 requires an external quartz crystal connected to the X1 and X2 pins as well as an external
energy source connected to the V
BAT
pin. A standard 32.768 kHz quartz crystal can be directly connected
to the DS14285 via pins 1 and 2 (X1, X2). The crystal selected for use should have a specified load
capacitance (C
L
) of 6 pF. For more information on crystal selection and crystal layout considerations,
please consult Application Note 58, “Crystal Considerations with Dallas Real-time Clocks.”
The DS14285/DS14287 uses its backup energy source and battery-backup controller to make a standard
CMOS static RAM nonvolatile during power-fail conditions. During power fail, the DS14285/DS14287
automatically write-protects the external SRAM and provides a V
CC
output sourced from its internal
battery.
相關(guān)PDF資料 |
PDF描述 |
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| DS14285SN | Real Time Clock with NV RAM Control |
| DS1490F | 2-in-1 Fob |
| DS1602 | Elapsed Time Counter |
| DS1603 | Elapsed Time Counter Module |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS14285S/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC |
| DS14285S/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 |
| DS14285S/TR | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Real-Time Clock with NV RAM |
| DS14285S+ | 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 |
| DS14285S+T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC |
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