參數(shù)資料
型號(hào)： DS14287
英文描述： Real Time Clock with NV RAM Control
中文描述： 實(shí)時(shí)時(shí)鐘，帶有非易失RAM控制器
文件頁(yè)數(shù)： 5/25頁(yè)
文件大?。?/td> 303K
代理商： DS14287
DS14285/DS14287
5 of 25
In a typical application
RESET
can be connected to V
CC
. This connection will allow the DS14287 to go in
and out of power fail without affecting any of the control registers.
CEI
(External RAM Chip Enable Input, active low)
-
CEI
should be driven low to enable the external
RAM.
CEI
is internally pulled up with a 50k
resistor.
CEO
(External RAM Chip Enable Output, active low)
- When V
CC
is greater than 4.25 volts (typical),
CEO
will reflect
CEI
provided the
RESET
is at a logic high. When V
CC
is less than 4.25 volts (typical),
CEO
will be forced to an inactive level regardless of
CEI
.
V
CCO
(External RAM Power Supply Output)
- V
CCO
provides the higher of V
CC
or V
BAT
through an
internal switch to power an external RAM.
DS14285 Only
X1, X2
- Connections for a standard 32.768 kHz quartz crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (CL) of 6 pF. The crystal is
connected directly to the X1 and X2 pins. There is no need for external capacitors or resistors. Note: X1
and X2 are very high impedance nodes. It is recommended that they and the crystal be guard–ringed with
ground and that high frequency signals be kept away from the crystal area. For more information on
crystal selection and crystal layout considerations, please consult Application Note 58, “Crystal
Considerations with Dallas Real Time Clocks.”
V
BAT
– Battery input for any standard 3-volt lithium cell or other energy source. See the Power-Up/Down
section for considerations in selecting the size of the external energy source
The battery should be connected directly to the V
BAT
pin. A diode must not be placed in series with the
battery to the VBAT pin. Furthermore, a diode is not necessary because reverse charging current
protection circuitry is provided internal to the device and has passed the requirements of Underwriters
Laboratories for UL listing.
相關(guān)PDF資料
PDF描述
DS14285-DS14287 Real Time Clock with NV RAM Control
DS14285 Real Time Clock with NV RAM Control
DS14285N Real Time Clock with NV RAM Control
DS14285Q Real Time Clock with NV RAM Control
DS14285QN Real Time Clock with NV RAM Control
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS14287+ 功能描述:實(shí)時(shí)時(shí)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(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
DS1-48-0001 功能描述:固定電感器 DS Storage choke 3.15A RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類(lèi)型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm
DS1-48-0002 功能描述:固定電感器 DS Storage choke 4A RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類(lèi)型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm
DS1-48-0003 制造商:Schurter Electronic Components 功能描述:
DS1-48-0004 制造商:Schurter Electronic Components 功能描述:
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