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PD72042B Datasheet(PDF) 87 Page - Renesas Technology Corp

Part No. PD72042B
Description  LSI DEVICE FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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PD72042B Datasheet(HTML) 87 Page - Renesas Technology Corp

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µPD72042B
85
Data Sheet S13990EJ3V0DS
Circuit connected to IEBus
Remark Protective resistor
RS = 180
Ω ± 5 %
Terminating resistor
RL = 120
Ω ± 5 %
Load capacitor
Cg
Please use the capacitor on the bus line under the capacitance shown in the table below.
System clock (fX)
Maximum capacitance between
the Bus+ pin and Bus– pin
6 MHz
8000 pF
6.29 MHz
7100 pF
Therefore, the total load capacitance CT between the Bus+ pin and Bus– pin is as follows.
CT =
N
1
Cg + CW
CW: Wiring capacitance
Σ
2
Cautions 1. The circuit constants in the above figure are applied when each unit connected to the IEBus
line uses the
µµµµµPD72042B.
2. The load capacitor connected to the bus line should be located closer to the IEBus than to
the protective resistor, as shown in the figure above.
3. Do not insert inductive parts into the bus line.
Bus
+
RS
RS
Cg
Cg
RL
RL
Bus
µPD72042B


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