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PCA9508D

更新时间： 2024-02-07 20:06:22

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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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

Hot swappable level translating I²C-bus repeater

Rev. 01 — 28 April 2008

Product data sheet

1. General description

The PCA9508 is a CMOS integrated circuit that supports hot-swap with zero offset and

provides level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to

5.5 V) for I²C-bus or SMBus applications. While retaining all the operating modes and

features of the I²C-bus system during the level shifts, it also permits extension of the

I²C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL)

lines, thus enabling two buses of 400 pF. Using the PCA9508 enables the system

designer to isolate two halves of a bus for both voltage and capacitance, and perform

hot-swap and voltage level translation. Furthermore, the dual supply pins can be powered

up in any sequence; when any of the supply pins are unpowered, the 5 V tolerant I/O are

high-impedance.

The hot swap feature allows an I/O card to be inserted into a live backplane without

corrupting the data and clock buses. Control circuitry prevents the backplane from being

connected to the card until a stop command or bus idle occurs on the backplane without

bus contention on the card. Zero offset output voltage allows multiple PCA9508s to be put

in series and still maintains an excellent noise margin.

PCA9508 has B side and A side bus drivers. The 2.7 V to 5.5 V bus B side drivers behave

much like the drivers on the PCA9515A device, while the adjustable voltage bus A side

drivers drive more current and incur no static offset voltage. This results in a LOW on the

B side translating into a nearly 0 V LOW on the A side.

The static offset design of the B side PCA9508 I/O drivers prevents them from being

connected to another device that has a rise time accelerator including the PCA9510/A,

PCA9511/A, PCA9512/A, PCA9513/A, or PCA9514/A or a static offset voltage including

the PCA9507 (B side), PCA9508 (B side), PCA9509 (A side), PCA9515/A, PCA9516A,

PCA9517/A (B side), PCA9518, PCA9519 (A side), or P82B96/PCA9600 (Sx/Sy side).

The A side of two or more PCA9508s can be connected together, however, to allow a star

topology with the A side on the common bus, and the A side can be connected directly to

any other buffer with static or dynamic offset voltage. Multiple PCA9508s can be

connected in series, A side to B side, with no build-up in offset voltage with only

time-of-ﬂight delays to consider.

The PCA9508 drivers are not enabled unless the bus is idle, V_CC(A)is above 0.8 V and

V_CC(B)is above 2.5 V. The EN pin can also be used to turn the drivers on and off under

system control. Caution should be observed to only change the state of the enable pin

when the bus is idle.

The output pull-down on the B side internal buffer LOW is set for approximately 0.5 V,

while the input threshold of the internal buffer is set about 70 mV lower (0.43 V). When the

B side I/O is driven LOW internally, the LOW is not recognized as a LOW by the input.

12 3 4 5 6 7...21

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PCA9508D,112	NXP	PCA9508 - Hot swappable level translating I2C-bus repeater SOIC 8-Pin	获取价格
PCA9508D,118	NXP	PCA9508 - Hot swappable level translating I2C-bus repeater SOIC 8-Pin	获取价格
PCA9508DP	NXP	Hot swappable level translating I2C-bus repeater	获取价格
PCA9508DP,118	NXP	PCA9508 - Hot swappable level translating I2C-bus repeater TSSOP 8-Pin	获取价格
PCA9508DP-T	NXP	IC,REPEATER INTERFACE,CMOS,TSSOP,8PIN,PLASTIC	获取价格
PCA9508D-T	NXP	IC,REPEATER INTERFACE,CMOS,SOP,8PIN,PLASTIC	获取价格

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