NXP Semiconductors

PCA9601

Dual bidirectional bus buffer

Detail

PCA9601/PCA9600

P82B96

TX/RX switching specifications (I2C-bus

compliant):

yes, all classes including 1 MHz Fm+ yes, all classes including Fm+

RX logic levels with tighter control than I2C-

bus limit of 30 % to 70 %:

yes, 40 % to 55 % (48 % nominal)

yes, 42 % to 58 % (50 % nominal)

Maximum bus speed:

> 1 MHz

> 400 kHz

ESD rating HBM per JESD22-A114:

> 3500 V

> 3500 V

Package:

SO8, TSSOP8 (MSOP8)

SO8, TSSOP8 (MSOP8)

Table 4. PCA9601/PCA9600 versus P82B96...continued

When the device driving the PCA9601/PCA9600 is an I2C-bus compatible device, then

the PCA9601 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 PCA9601/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 PCA9601/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 PCA9601/PCA9600 is better, providing 0.7 V, that difference is not

big.

8 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

Table 5. Limiting values

PCA9601

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© NXP B.V. 2022. All rights reserved.

Product data sheet

Rev. 3.1 — 4 January 2022

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