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PCA9508D

更新时间： 2024-02-17 03:35:43

品牌	Logo	应用领域
恩智浦 - NXP		驱动程序和接口接口集成电路中继器光电二极管
页数	文件大小	规格书
21页	135K
描述
Hot swappable level translating I2C-bus repeater

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技术参数
数据手册

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PCA9508D 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	SOP, SOP8,.25	Reach Compliance Code：	unknown
风险等级：	5.83	JESD-30 代码：	R-PDSO-G8
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	3/5 V	认证状态：	Not Qualified
子类别：	Line Driver or Receivers	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	Base Number Matches：	1

PCA9508D 数据手册

PCA9508

NXP Semiconductors

Hot swappable level translating I²C-bus repeater

On the B bus side of the PCA9508, the clock and data lines would have a positive offset

from ground equal to the V_OLof the PCA9508. After the 8^thclock pulse, the data line will

be pulled to the V_OLof the slave device, which is very close to ground in this example. At

the end of the acknowledge, the level rises only to the LOW level set by the driver in the

PCA9508 for a short delay while the A bus side rises above 0.5V_CC(A)then it continues

HIGH. It is important to note that any arbitration or clock stretching events require that the

LOW level on the B bus side at the input of the PCA9508 (V_IL) be at or below 0.4 V to be

recognized by the PCA9508 and then transmitted to the A bus side.

Multiple PCA9508 A sides can be connected in a star conﬁguration (Figure 5), allowing all

nodes to communicate with each other.

Multiple PCA9508s can be connected in series (Figure 6) as long as the A side is

connected to the B side. I²C-bus slave devices can be connected to any of the bus

segments. The number of devices that can be connected in series is limited by repeater

delay/time-of-ﬂight considerations on the maximum bus speed requirements.

CC(B)

CC(A)

10 kΩ

CC(B)

CC(A)

SDAA

SCLA

SDAB

SCLB

SDA

SCL

SDA

SCL

BUS

MASTER

PCA9508

SLAVE

400 kHz

10 kΩ

CC(B)

CC(A)

SDAA

SCLA

SDAB

SCLB

SDA

SCL

PCA9508

SLAVE

400 kHz

10 kΩ

CC(B)

CC(A)

SDAA

SCLA

SDAB

SCLB

SDA

SCL

PCA9508

SLAVE

400 kHz

002aac655

Fig 5. Typical star application

PCA9508_1

Product data sheet

Rev. 01 — 28 April 2008

7 of 21

1...4 5 678 9 10...21

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