P82B715PN NXP Semiconductors, P82B715PN Datasheet - Page 8

• Manufacturer Part Number: P82B715PN
• Description: IC, I/O EXPANDER, 400KHZ, DIP-8
• Manufacturer: NXP Semiconductors

Specifications of P82B715PN

• Bus Frequency: 400kHz
• Ic Interface Type: I2C
• Supply Voltage Range: 4.5V To 12V
• Digital Ic Case Style: DIP
• No. Of Pins: 8
• Termination Type: DIP
• Interface Type: I2C
• Filter Terminals: DIP
• Rohs Compliant: Yes
• Clock Frequency: 3.6864MHz
• Features: I2C-Bus
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
P82B715_8
Product data sheet
The P82B715 has a static sink rating of 30 mA at Lx. The requirement is that the pull-up
on the buffered bus, in parallel with all other pull-ups that it is indirectly pulling LOW on Sx
pins of other P82B715 ICs, will not cause this 30 mA limit to be exceeded.
The minimum pull-up resistance in a 5 V
The general requirement is given in
Where: R
P82B715.
Figure 7
capacitance.
V
------------------------------------------
Fig 7.
CC max
R
2
PU
GND
V
local bus I
shows calculations for an expanded Standard-mode I
total capacitance
–
Typical loading calculation: adding an extension bus with P82B715
PU
CC
I
R1 =
effective capacitance
local I
2
I
I
0.4 V
C-bus devices
2
2
C-BUS
C-BUS
= parallel combination of all pull-up resistors driven by the Lx pin of the
50 pF
2
P82B715
1 s
C-bus pull-up
2
C-bus devices
strays
30 mA
SDA
SDA
= 20 k
Rev. 08 — 9 November 2009
local bus
20 pF
20 pF
10 pF
50 pF
R1
Sx
wiring capacitance
Equation
total capacitance
R2 =
effective capacitance
at common Lx node
buffered bus pull-up
3000 pF
Lx
1 s
10 % system is 170 .
proposed bus expansion
2:
= 330
LDA
R2
3000 pF
3000 pF
3 nF = cable wiring capacitance
Lx
Sx
1
2
C-bus with 3 nF of cable
remote I
total capacitance
remote I
R3 =
I
effective capacitance
2
C-bus devices
R3
SDA
30 pF
P82B715
1 s
2
2
C-bus devices
C-bus pull-up
P82B715
© NXP B.V. 2009. All rights reserved.
strays
I
2
I
C-bus extender
2
= 33 k
C-BUS
002aad692
10 pF
10 pF
10 pF
30 pF
5 V
0 V
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