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PCA9600 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9600 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 31 page PCA9600 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 5 — 5 May 2011 6 of 31 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 |
Similar Part No. - PCA9600_11 |
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Similar Description - PCA9600_11 |
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