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參數(shù)資料
| 型號： | DS1244Y-120 |
| 英文描述： | 256K NV SRAM with Phantom Clock |
| 中文描述： | 256K非易失SRAM與幻影時鐘 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 100K |
| 代理商： | DS1244Y-120 |
ECopyright 1997 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
DS1244Y
256K NV SRAM with Phantom Clock
DS1244Y
032697 1/12
FEATURES
Realtimeclockkeepstrackofhundredthsofseconds,
minutes, hours, days, date of the month, months, and
years
32K x 8 NV SRAM directly replaces volatile static
RAM or EEPROM
Embedded lithium energy cell maintains calendar op-
eration and retains RAM data
Watch function is transparent to RAM operation
Monthand year determine the number of days in each
month; volid up to 1200
Standard 28–pin JEDEC pinout
Full 10% operating range
Operating temperature range 0°C to 70°C
Accuracy is better than ±1 minute/month @ 25°C
Over 10 years of data retention in the absence of
power
Available in 120, 150 and 200 ns access time
ORDERING INFORMATION
DS1244Y–XXX
DS1244Y
–120
120 ns access
–150
150 ns access
200 ns access
PIN ASSIGNMENT
28–PIN ENCAPSULATED PACKAGE
740 MIL EXTENDED
VCC
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
A14/RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PIN DESCRIPTION
Ao–A14
– Address Inputs
CE
– Chip Enable
GND
– Ground
DQ0-DQ7
– Data In/Data Out
VCC
– Power (+5V)
WE
– Write Enable
OE
– Output Enable
NC
– No Connect
RST
– Reset
DESCRIPTION
The DS1244Y 256K NV SRAM with Phantom Clock is a
fully static nonvolatile RAM (organized as 32,768 words
by 8 bits) with a built–in real time clock. The DS1244Y
has a self–contained lithium energy source and control
circuitry which constantly monitors VCC for an out–of–
tolerance condition. When such a condition occurs, the
lithium energy source is automatically switched on and
write protection is unconditionally enabled to prevent
garbled data in both the memory and real time clock.
The Phantom Clock provides timekeeping information
including hundredths of seconds, seconds, minutes,
hours, day, date, month, and year information. The date
at the end of the month is automatically adjusted for
months with less than 31 days, including correction for
leap years. The Phantom Clock operates in either
24–hour or 12–hour format with an AM/PM indicator.
相關PDF資料 |
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| DS1386P08-120 | RAMified Watchdog Timekeeper |
| DS1386P32-120 | RAMified Watchdog Timekeeper |
| DS1411DB-9 | Serial Port iButton Holder |
| DS1608B-684MSB | 1 ELEMENT, 680 uH, FERRITE-CORE, GENERAL PURPOSE INDUCTOR, SMD |
| DS1608B-475MTD | 1 ELEMENT, 4700 uH, FERRITE-CORE, GENERAL PURPOSE INDUCTOR, SMD |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1244Y-150 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS1244Y-200 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:256K NV SRAM with Phantom Clock |
| DS1244Y-70 | 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1244Y-70+ | 功能描述:實時時鐘 256k NV SRAM w/Phantom Clock 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1244YP/WP | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:PowerCap with Crystal |
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