P82B96TD/S911,118 NXP Semiconductors, P82B96TD/S911,118 Datasheet - Page 20

• Manufacturer Part Number: P82B96TD/S911,118
• Description: IC I2C BUS BUFFER DUAL 8-SOIC
• Manufacturer: NXP Semiconductors
• Type: Bufferr

Specifications of P82B96TD/S911,118

• Tx/rx Type: I²C Logic
• Delay Time: 5.0ns
• Capacitance - Input: 7pF
• Voltage - Supply: 2 V ~ 15 V
• Current - Supply: 900µA
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935283838118; P82B96TD/S911-T; P82B96TD/S911-T

NXP Semiconductors
P82B96_8
Product data sheet
10.2.1 Example with questions and answers
Fig 22. Transients generated by the bus wiring
Question: On a falling edge of Tx we measure undershoot at 800 mV at the linked Tx,
Rx pins of the P82B96 that is generating the LOW, but the P82B96 data sheet specifies
minimum 0.3 V. Does this mean that we violate the data sheet absolute value?
Answer: For P82B96 the 0.3 V Absolute Maximum rating is not intended to apply to
transients, it is a DC rating. As shown in
undershoot at the IC that is driving the bus LOW and no significant undershoot should
be observed when using reasonable care with the ground connection of the ‘scope. It is
more likely that undershoot observed at a driving P82B96 is caused by local stray
inductance and capacitance in the circuit and by the oscilloscope connections. As
shown, undershoot will be generated by PCB traces, wiring, or cables driven by a
P82B96 because the allowed value of the I
than that required to correctly terminate the wiring. In this example, with no IC
connected at the end of the wiring, the undershoot is about 2 V.
voltage
Rev. 08 — 10 November 2009
(V)
6
4
2
0
2
horizontal scale = 62.5 ns/div
Sx
5 V
P82B96
Rx
Tx
send
send
5 V
Figure
300
2
C-bus pull-up resistor generally is larger
2 meter
cable
receive
22, there is no theoretical reason for any
time (ns)
5 V
002aaf064
300
receive
GND
Dual bidirectional bus buffer
© NXP B.V. 2009. All rights reserved.
P82B96
20 of 32