PCA9600D NXP [NXP Semiconductors], PCA9600D Datasheet - Page 6

• Manufacturer Part Number: PCA9600D
• Description: Dual bidirectional bus buffer
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
8. Limiting values
PCA9600_4
Product data sheet
When the device driving the PCA9600 is an I
is an improvement on the P82B96 as shown in
however, and if the device driving the bus buffer is not I
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:
Table 5.
In accordance with the Absolute Maximum Rating System (IEC 60134).
Voltages with respect to pin GND.
[1]
Symbol
V
V
V
V
I
P
T
T
T
I2C-bus
•
•
•
j
stg
amb
CC
I2C-bus
O
I
tot
When the pull-up must be the weakest one possible. The spec is 200 A 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 A 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 I
low that is below 0.83 V. P82B96 guarantees that with a 200 A pull-up.
When the operating temperature range is restricted at both limits. An I
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.
See also
Limiting values
Section 10.2 “Negative undershoot below absolute minimum
2
Parameter
supply voltage
I
output voltage
input voltage
I
total power dissipation
junction temperature
storage temperature
ambient temperature
2
2
C-bus compliant driver on 3.3 V the P82B96 is required to guarantee a bus
C-bus voltage
C-bus current
Rev. 04 — 11 November 2009
Conditions
V
SX and SY;
I
TX and TY;
buffered output
RX and RY;
receive input
SX and SY;
I
operating range
operating
2
2
CC
C-bus SDA or SCL
C-bus SDA or SCL
to GND
2
C-bus compatible device, then the PCA9600
Table
4. There will always be exceptions
2
C-bus compatible (e.g., you need
Dual bidirectional bus buffer
value”.
[1]
[1]
Min
-
-
0.3
0.3
0.3
0.3
40
55
40
PCA9600
© NXP B.V. 2009. All rights reserved.
Max
+18
+18
+18
+18
250
300
+125
+125
+85
2
C driver's
Unit
V
V
V
V
mA
mW
C
C
C
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