參數資料
| 型號： | PT7C43390WEX |
| 廠商： | Pericom |
| 文件頁數： | 1/23頁 |
| 文件大小： | 0K |
| 描述： | IC REAL TIME CLOCK 8SOIC |
| 標準包裝： | 1 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，閏年，方波輸出 |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 數據格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 1.3 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.1 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 標準包裝 |
| 其它名稱： | PT7C43390WEXDKR |
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PT0280(08/09)
Ver: 3
1
Data Sheet
PT7C43390
2-Wire Real-time Clock Module
Product Features
Low current consumption: 0.4 A typ. (VDD=3.0 V,
TA = 25°C)
Wide operating voltage range: 1.3 to 5.5 V
Minimum time keeping operation voltage: 1.1 V
Built-in clock adjustment function
Built-in free user register
2-wire (I2C-BUS) CPU interface
Built-in alarm interrupter
Built-in flag generator at power down or power on
Auto calendar up to the year 2099, automatic leap
year calculation function
Built-in constant voltage circuit
Built-in 32 kHz crystal oscillator circuit (Cd built in,
Cg external)
Lead free and Green Package: 8-pin SOIC, 8-pin
TSSOP
Ordering Information
Part Number
Package
PT7C43390WE
Lead free and Green 8-Pin SOIC
PT7C43390LE
Lead free and Green 8-Pin TSSOP
Product Description
The PT7C43390 is low-current consumption 2-wire
CMOS real-time clock IC that features a wide operating
voltage range(1.3V to 5.5V) and can be driven on a
variety of supply voltages, from a main supply to a
backup supply. The time keeping current consumption
of 0.4A and minimum time keeping operation voltage
of 1.1V enable greatly increased battery duration.
In a system that operates on a backup battery, the
free register incorporated in the real-time clock can be
used for the user backup memory function. The user
register can hold data on a supply voltage as low as
1.1V(min.), so the data stored in the register before the
main power supply was cut can be called any time after
the voltage is restored.
This product also includes a clock adjustment
function that enables wide-ranging correction of
deviation in the frequency of the crystal oscillator at a
minimum resolution of 1 ppm. Also, by combining this
function with a temperature sensor, the clock adjustment
value can be set in accordance with changes in the
temperature, which makes it possible to realize a clock
function that retains a high degree of accuracy regardless
of temperature variation.
Table 1 shows the basic functions of PT7C43390.
More details are shown in section: Overview of
Functions.
Table 1. Basic functions of PT7C43390
Item
Function
PT7C43390
1
Oscillator
Source
Crystal*
√
12-hour
√
2
Time
Time display
24-hour
√
3
Interrupt
Alarm interrupt output
√2
4
Programmable square wave output (Hz)
1Hz,2Hz,4Hz,8Hz,16Hz,32kHz
2-wire I2C bus
√
5
Communication
Burst mode
√
IC test mode
√
Power-on detector
√
6
Control
Power supply voltage detector
√
7
Clock calibratoin
√
8
Free register acess
√
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