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參數(shù)資料
| 型號： | DS1647 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | XO, clock |
| 英文描述： | Nonvolatile Timekeeping RAM(非易失性計時RAM) |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA32 |
| 封裝： | PLASTIC, MODULE, DIP-32 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 131K |
| 代理商： | DS1647 |
DS1647/DS1647P
031798 3/12
TRUTH TABLE DS1647
Table 1
V
CC
CE
OE
WE
MODE
DQ
POWER
5 VOLTS
±
10%
V
IH
X
X
DESELECT
HIGH–Z
STANDBY
X
X
X
DESELECT
HIGH–Z
STANDBY
V
IL
X
V
IL
WRITE
DATA IN
ACTIVE
V
IL
V
IL
V
IH
READ
DATA OUT
ACTIVE
V
IL
V
IH
V
IH
READ
HIGH–Z
ACTIVE
<4.5 VOLTS
>V
BAT
X
X
X
DESELECT
HIGH–Z
CMOS STANDBY
<V
BAT
X
X
X
DESELECT
HIGH–Z
DATA RETENTION
MODE
SETTING THE CLOCK
The eighth bit of the control register is the write bit. Set-
ting the write bit to a one, like the read bit, halts updates
to the DS1647 registers. The user can then load them
with the correct day, date and time data in 24 hour BCD
format. Resetting the write bit to a zero then transfers
those values to the actual clock counters and allows
normal operation to resume.
STOPPING AND STARTING THE CLOCK
OSCILLATOR
The clock oscillator may be stopped at any time. To in-
crease the shelf life, the oscillator can be turned off to
minimize current drain from the battery. The OSC bit is
the MSB for the seconds registers. Setting it to a one
stops the oscillator.
FREQUENCY TEST BIT
Bit 6 of the day byte is the frequency test bit. When the
frequency test bit is set to logic “1” and the oscillator is
running, the LSB of the seconds register will toggle at
512 Hz. When the seconds register is being read, the
DQ0 line will toggle at the 512 Hz frequency as long as
conditions for access remain valid (i.e., CE low, OE low,
and address for seconds register remain valid and
stable).
CLOCK ACCURACY (DIP MODULE)
The DS1647 is guaranteed to keep time accuracy to
within
±
1 minute per month at 25
°
C. The clock is cali-
brated at the factory by Dallas Semiconductor using
special calibration nonvolatile tuning elements. The
DS1647 does not require additional calibration and tem-
perature deviations will have a negligible effect in most
applications. For this reason, methods of field clock cal-
ibration are not available and not necessary.
CLOCK ACCURACY (POWERCAP MODULE)
The DS1647P and DS9034PCX are each individually
tested for accuracy. Once mounted together, the mod-
ule is guaranteed to keep time accuracy to within
±
1.53
minutes per month (35 ppm) at 25
°
C.
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參數(shù)描述 |
|---|---|
| DS1647-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based) |
| DS1647-120 | 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 |
| DS1647-120+ | 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 |
| DS1647-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NVRAM (Battery Based) |
| DS1647D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Bus Transceiver |
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