PCA9600 datasheet(6/30 Pages) NXP

Part #	PCA9600

Description	Dual bidirectional bus buffer

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Manufacturer	NXP [NXP Semiconductors]

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PCA9600_4

Product data sheet

Rev. 04 — 11 November 2009

6 of 30

NXP Semiconductors

PCA9600

Dual bidirectional bus buffer

When the device driving the PCA9600 is an I2C-bus compatible device, then the PCA9600

is an improvement on the P82B96 as shown in Table 4. There will always be exceptions

however, and if the device driving the bus buffer is not I2C-bus compatible (e.g., you need

to use the micro already in the system and bit-bang using two GPIO pins) then here are

some considerations that would point to using the P82B96 instead:

• When the pull-up must be the weakest one possible. The spec is 200

µA for P82B96,

but it typically works even below that. And if designing for a temperature range

−40 °C

up to +60

°C, then the driver when sinking 200 µA only needs to drive a guaranteed

low of 0.55 V. For the PCA9600, over that same temperature range and when sinking

1.3 mA (at

−40 °C), the device driving the bus buffer must provide the required low of

0.425 V.

• When the lower operating temperature range is restricted (say 0

°C). The P82B96

larger SX voltage levels then make a better typical match with the driver, even when

the supply is as low as 3.3 V.

For an I2C-bus compliant driver on 3.3 V the P82B96 is required to guarantee a bus

low that is below 0.83 V. P82B96 guarantees that with a 200

µA pull-up.

• When the operating temperature range is restricted at both limits. An I2C driver's

typical output is well below 0.4 V and the P82B96 typically requires 0.6 V input even

at +60

°C, so there is a reasonable margin. The PCA9600 requires a typical input low

of 0.5 V so its typical margin is smaller. At 0

°C the driver requires a typical input low

of 1.16 V and P82B96 provides 0.75 V, so again the typical margin is already quite big

and even though PCA9600 is better, providing 0.7 V, that difference is not big.

8.

Limiting values

[1]

See also Section 10.2 “Negative undershoot below absolute minimum value”.

Table 5.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Voltages with respect to pin GND.

Symbol

Parameter

Conditions

Min

Max

Unit

VCC

supply voltage

VCC to GND

−0.3

+18

V

VI2C-bus

I2C-bus voltage

SX and SY;

I2C-bus SDA or SCL

−0.3

+18

V

VO

output voltage

TX and TY;

buffered output

[1]

−0.3

+18

V

VI

input voltage

RX and RY;

receive input

[1]

−0.3

+18

V

II2C-bus

I2C-bus current

SX and SY;

I2C-bus SDA or SCL

-

250

mA

Ptot

total power dissipation

-

300

mW

Tj

junction temperature

operating range

−40

+125

°C

Tstg

storage temperature

−55

+125

°C

Tamb

ambient temperature

operating

−40

+85

°C

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