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参数资料
| 型号： | DS1338Z-18+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC RTC 56BYTE NV RAM 1.8V 8-SOIC |
| 标准包装： | 2,500 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，NVSRAM，方波输出 |
| 存储容量： | 56B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.71 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1338 I2C RTC with 56-Byte NV RAM
7 of 16
PIN DESCRIPTION
PIN
NAME
FUNCTION
8
16
1
—
X1
32.768kHz Crystal Connections. The internal oscillator circuitry is designed for
operation with a crystal having a specified load capacitance (CL) of 12.5pF. An
external 32.768kHz oscillator can also drive the DS1338. In this configuration,
the X1 pin is connected to the external oscillator signal and the X2 pin is left
unconnected.
Note: For more information about crystal selection and crystal layout considerations,
refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks.
2
—
X2
3
14
VBAT
Backup Supply Input for Lithium Cell or Other Energy Source. Battery voltage
must be held between the minimum and maximum limits for proper operation.
Diodes placed in series between the backup source and the VBAT pin may
prevent proper operation. If a backup supply is not required, VBAT must be
grounded. UL recognized to ensure against reverse charging when used with a
lithium cell. For more information, visit www.maxim-ic.com/qa/info/ul.
4
15
GND
Ground. DC power is provided to the device on these pins. VCC is the primary
power input. When voltage is applied within normal limits, the device is fully
accessible and data can be written and read. When a backup supply is
connected to the device and VCC is below VPF, reads and writes are inhibited.
However, the timekeeping function continues unaffected by the lower input
voltage.
5
16
SDA
Serial Data. Input/output pin for the I2C serial interface. It is an open drain
output and requires an external pullup resistor. The pull up voltage may be up
to 5.5V regardless of the voltage on VCC.
6
1
SCL
Serial Clock. Input pin for the I2C serial interface. Used to synchronize data
movement on the serial interface. The pull up voltage may be up to 5.5V
regardless of the voltage on VCC.
7
2
SQW/OUT
Square-Wave/Output Driver. When enabled and the SQWE bit set to 1, the
SQW/OUT pin outputs one of four square-wave frequencies (1Hz, 4kHz, 8kHz,
32kHz). It is an open drain output and requires an external pullup resistor.
Operates with either VCC or VBAT applied. The pull up voltage may be up to
5.5V regardless of the voltage on VCC. If not used, this pin may be left
unconnected.
8
3
VCC
Primary Power Supply. When voltage is applied within normal limits, the device
is fully accessible and data can be written and read. When a backup supply is
connected to the device and VCC is below VPF, reads and writes are inhibited.
The backup supply maintains the timekeeping function while VCC is absent.
—
4–13
N.C.
No Connection. These pins are not connected internally, but must be grounded
for proper operation.
DETAILED DESCRIPTION
The DS1338 serial RTC is a low-power, full BCD clock/calendar plus 56 bytes of NV SRAM. Address and data are
transferred serially through an I2C interface. The clock/calendar provides seconds, minutes, hours, day, date,
month, and year information. The end of the month date is automatically adjusted for months with fewer than 31
days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM
indicator. The DS1338 has a built-in power-sense circuit that detects power failures and automatically switches to
the VBAT supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1338Z-3 | 功能描述:实时时钟 I2C Serial RTC w/56 Byte NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1338Z-3/T&R | 功能描述:实时时钟 I2C Serial RTC w/56 Byte NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1338Z-3+ | 功能描述:实时时钟 I2C Serial RTC w/56 Byte NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1338Z-3+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 56BYTE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC 56BYTE NV RAM 3V 8-SOIC 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C Serial RTC w/56 Byte NV RAM |
| DS1338Z-3+T&R | 功能描述:实时时钟 I2C Serial RTC w/56 Byte NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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