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参数资料
| 型号： | DS17485SN-5+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/31页 |
| 文件大小： | 0K |
| 描述： | IC RTC 5V 4K NV RAM 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 31 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，夏令时，闰年，NVSRAM，方波输出 |
| 存储容量： | 4KB |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.5 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
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DS17285/DS17287/DS17485/DS17487/DS17885/DS17887
Real-Time Clocks
_____________________________________________________________________
7
SUPPLY CURRENT
vs. INPUT VOLTAGE
DS17285/87
toc01
VBAT (V)
SUPPLY
CURRENT
(nA)
3.5
3.3
3.0
2.8
250
300
350
400
200
2.5
3.8
VCC = 0V
SUPPLY CURRENT
vs. TEMPERATURE
DS17285/87
toc02
TEMPERATURE (
°C)
SUPPLY
CURRENT
(nA)
65
50
35
20
5
-10
-25
300
350
400
250
-40
80
VBAT = 3.0V
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
DS17285/87
toc03
SUPPLY VOLTAGE (V)
OSCILLATOR
FREQUENCY
(Hz)
5.0
4.5
4.0
3.5
3.0
32768.1
32768.2
32768.3
32768.4
32768.5
32768.6
32768.7
32768.0
2.5
5.5
Typical Operating Characteristics
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
Pin Description
PIN
24
28
NAME
FUNCTION
1
8
PWR
Active-Low Power-On Reset. This open-drain output pin is intended for use as an on/off
control for the system power. With VCC voltage removed from the device,
PWR can be
automatically activated from a kickstart input by the
KS pin or from a wake-up interrupt.
Once the system is powered on, the state of
PWR can be controlled by bits in the control
registers. The
PWR pin can be connected through a pullup resistor to a positive supply. For
5V operation, the voltage of the pullup supply should be no greater than 5.7V. For 3V
operation, the voltage on the pullup supply should be no greater than 3.9V.
2, 3
9, 10
X1, X2
Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (CL) of 6pF or
12.5pF. Pin X1 is the input to the oscillator and can optionally be connected to an external
32.768kHz oscillator. The output of the internal oscillator, pin X2, is left unconnected if an
external oscillator is connected to pin X1. These pins are missing (N.C.) on the EDIP
package.
4–11
12–17,
19, 20
AD0–AD7
Multiplexed Bidirectional Address/Data Bus. The addresses are presented during the first
portion of the bus cycle and latched into the device by the falling edge of ALE. Write data is
latched by the rising edge of
WR. In a read cycle, the device outputs data during the latter
portion of the
RD low. The read cycle is terminated and the bus returns to a high-impedance
state as
RD transitions high.
12, 16
21, 22, 26
GND
Ground
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