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參數(shù)資料
| 型號： | DS1244Y |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | XO, clock |
| 英文描述： | 256K NV SRAM with Phantom Clock(帶幻影實時時鐘的非易失性SRAM) |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 91K |
| 代理商： | DS1244Y |
DS1244Y
256K NV SRAM with Phantom Clock
DS1244Y
022798 1/12
FEATURES
Real time clock keeps track of hundredths of seconds,
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
Month and year determine the number of days in each
month; valid up to 1200
Lithium energy source is electrically disconnected to
retain freshness until power is applied for the first time
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
–150
120 ns access
150 ns access
200 ns access
PIN ASSIGNMENT
28–PIN ENCAPSULATED PACKAGE
740 MIL EXTENDED
V
CC
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
A
o
–A
14
CE
GND
DQ
0
–DQ
7
V
CC
WE
OE
NC
RST
– Address Inputs
– Chip Enable
– Ground
– Data In/Data Out
– Power (+5V)
– Write Enable
– Output Enable
– No Connect
– 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 V
CC
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(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1245AB | 1024K Nonvolatile SRAM(1024K 非易失性靜態(tài)RAM) |
| DS1245Y | 1024K Nonvolatile SRAM(1024K 非易失性靜態(tài)RAM) |
| DS1245W | 3.3V 1024K Nonvolatile SRAM(3.3V 1024K 非易失性靜態(tài)RAM) |
| DS1248Y | Using the Dallas Phantom Real Time Clocks(帶幻象實時時鐘的NVSRAM) |
| DS1249AB | 2048K Nonvolatile SRAM(2048K 非易失性靜態(tài)RAM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1244Y120 | 制造商:Maxim Integrated Products 功能描述: |
| DS1244Y-120 | 制造商:Maxim Integrated Products 功能描述: |
| 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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