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參數(shù)資料
| 型號(hào)： | DS1643-100 |
| 英文描述： | Nonvolatile Timekeeping RAM |
| 中文描述： | 非易失性?xún)?nèi)存時(shí)鐘 |
| 文件頁(yè)數(shù)： | 1/11頁(yè) |
| 文件大?。?/td> | 81K |
| 代理商： | DS1643-100 |
ACopyright 1995 by Dallas Semiconductor Corporation.
DS1643
Nonvolatile Timekeeping RAM
DS1643
041697 1/11
FEATURES
Form, fit, and function compatible with the MK48T08
Timekeeping RAM
Integrated NV SRAM, real time clock, crystal, power–
fail control circuit and lithium energy source
Standard JEDEC bytewide 8K 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
ORDERING INFORMATION
DS1643–XXX
–120 120 ns access
150 ns access
–150
28–pin DIP module
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
NC
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
VCC
CE2
A8
A9
A11
A10
DQ7
DQ6
DQ5
DQ4
DQ3
WE
OE
CE
28–PIN ENCAPSULATED PACKAGE
(700 MIL EXTENDED)
DESCRIPTION
The DS1643 is an 8K 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
8K 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 DS1643
also contains its own power–fail circuitry which dese-
lects the device when the V
CC
supply is in an out of toler-
ance condition. This feature prevents loss of data from
unpredictable 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 |
|---|---|
| DS1643-100+ | 功能描述:實(shí)時(shí)時(shí)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(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 |
| DS1643-12 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Real-Time Clock |
| DS1643-120 | 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS1643-15 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Real-Time Clock |
| DS1643-150 | 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
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