參數(shù)資料
型號(hào)： DS17485SN-5+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 1/31頁(yè)
文件大?。?/td> 0K
描述： IC RTC 5V 4K NV RAM 24-SOIC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 31
類(lèi)型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，夏令時(shí)，閏年，NVSRAM，方波輸出
存儲(chǔ)容量： 4KB
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： 并聯(lián)
電源電壓： 4.5 V ~ 5.5 V
電壓 - 電源，電池： 2.5 V ~ 3.7 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 管件
General Description
The DS17285, DS17485, DS17885, DS17287, DS17487,
and DS17887 real-time clocks (RTCs) are designed to be
successors to the industry-standard DS12885 and
DS12887. The DS17285, DS17485, and DS17885 (here-
after referred to as the DS17x85) provide a real-time
clock/calendar, one time-of-day alarm, three maskable
interrupts with a common interrupt output, a programma-
ble square wave, and 114 bytes of battery-backed NV
SRAM. The DS17x85 also incorporates a number of
enhanced functions including a silicon serial number,
power-on/off control circuitry, and 2k, 4k, or 8kbytes of
battery-backed NV SRAM. The DS17287, DS17487, and
DS17887 (hereafter referred to as the DS17x87) integrate
a quartz crystal and lithium energy source into a 24-pin
encapsulated DIP package. The DS17x85 and DS17x87
power-control circuitry allows the system to be powered
on by an external stimulus such as a keyboard or by a
time-and-date (wake-up) alarm. The PWR output pin is
triggered by one or either of these events, and is used to
turn on an external power supply. The PWR pin is under
software control, so that when a task is complete, the sys-
tem power can then be shut down.
For all devices, the date at the end of the month is auto-
matically adjusted for months with fewer than 31 days,
including correction for leap years. It also operates in
either 24-hour or 12-hour format with an AM/PM indicator.
A precision temperature-compensated circuit monitors
the status of VCC. If a primary power failure is detected,
the device automatically switches to a backup supply. A
lithium coin cell battery can be connected to the VBAT
input pin on the DS17x85 to maintain time and date oper-
ation when primary power is absent. The DS17x85 and
DS17x87 include a VBAUX input used to power auxiliary
functions such as PWR control. The device is accessed
through a multiplexed byte-wide interface.
Applications
Embedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
Features
Incorporates Industry-Standard DS12887 PC
Clock Plus Enhanced Functions
RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap Year Compensation
Through 2099
Optional +3.0V or +5.0V Operation
SMI Recovery Stack
64-Bit Silicon Serial Number
Power-Control Circuitry Supports System Power-
On from Date/Time Alarm or Key Closure
Crystal Select Bit Allows Operation with 6pF or
12.5pF Crystal
12-Hour or 24-Hour Clock with AM and PM in
12-Hour Mode
114 Bytes of General-Purpose, Battery-Backed NV
SRAM
Extended Battery-Backed NV SRAM
2048 Bytes (DS17285/DS17287)
4096 Bytes (DS17485/DS17487)
8192 Bytes (DS17885/DS17887)
RAM Clear Function
Interrupt Output with Six Independently Maskable
Interrupt Flags
Time-of-Day Alarm Once per Second to Once per
Day
End of Clock Update Cycle Flag
Programmable Square-Wave Output
Automatic Power-Fail Detect and Switch Circuitry
Available in PDIP, SO, or TSOP Package
(DS17285, DS17485, DS17885)
Optional Encapsulated DIP (EDIP) Package with
Integrated Crystal and Battery (DS17287,
DS17487, DS17887)
Optional Industrial Temperature Range Available
Underwriters Laboratory (UL) Recognized
DS17285/DS17287/DS17485/DS17487/DS17885/DS17887
Real-Time Clocks
______________________________________________
Maxim Integrated Products
1
19-5222; Rev 1; 4/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information, Pin Configurations, and Typical
Operating Circuit appear at end of data sheet.
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