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參數(shù)資料
| 型號： | DS1642 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Nonvolatile Timekeeping RAM(非易失性計時RAM) |
| 中文描述： | 非易失時鐘RAM |
| 文件頁數(shù)： | 1/10頁 |
| 文件大小： | 76K |
| 代理商： | DS1642 |
DS1642
Nonvolatile Timekeeping RAM
DS1642
031698 1/10
FEATURES
Integrated NV SRAM, real time clock, crystal, power
fail control circuit and lithium energy source
Standard JEDEC bytewide 2K x 8 static RAM pinout
Clock registers are accessed identical to the static
RAM. These registers are resident in the eight top
RAM locations.
Totally nonvolatile with over 10 years of operation in
the absence of power
Access times of 120 ns and 150 ns
Quartz accuracy
±
1 minute a month @ 25
°
C, factory
calibrated
BCD coded year, month, date, day, hours, minutes,
and seconds with leap year compensation valid up to
2100
Power fail write protection allows for
±
10% V
CC
power
supply tolerance
PIN ASSIGNMENT
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
A8
A9
WE
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
PIN DESCRIPTION
A0–A10
CE
OE
WE
V
CC
GND
DQ0–DQ7
– Address Input
– Chip Enable
– Output Enable
– Write Enable
– +5 Volts
– Ground
– Data Input/Output
DESCRIPTION
The DS1642 is an 2K x 8 nonvolatile static RAM with a
full function real time clock which are both accessible in
a bytewide format. The nonvolatile time keeping RAM is
pin and function equivalent to any JEDEC standard
2K x 8 SRAM. The device can also be easily substituted
in ROM, EPROM and EEPROM sockets providing read/
write nonvolatility and the addition of the real time clock
function. The real time clock information resides in the
eight uppermost RAM locations. The RTC registers
contain year, month, date, day, hours, minutes, and se-
conds data in 24 hour BCD format. Corrections for the
day of the month and leap year are made automatically.
The RTC clock registers are double buffered to avoid
access of incorrect data that can occur during clock up-
date cycles. The double buffered system also prevents
time loss as the timekeeping countdown continues un-
abated by access to time register data. The DS1642
also contains its own power fail circuitry which deselects
the device when the V
CC
supply is in an out of tolerance
condition. This feature prevents loss of data from un-
predictable system operation brought on by low V
CC
as
errant access and update cycles are avoided.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1642-100 | 功能描述:實時時鐘 NV Timekeeping RAM 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 |
| DS1642-100+ | 功能描述:實時時鐘 NV Timekeeping RAM 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 |
| DS1642-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| DS1642-120 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-16K CMOS NVRAM |
| DS1642-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
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