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HD26LS32 Datasheet(PDF) 10 Page - Hitachi Semiconductor

Part No. HD26LS32
Description  Quadruple Differential Line Receivers With 3 State Outputs
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Manufacturer  HITACHI [Hitachi Semiconductor]
Direct Link  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

HD26LS32 Datasheet(HTML) 10 Page - Hitachi Semiconductor

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HD26LS32
10
5
4
3
2
1
0
–100 –80 –60 –40 –20
0
20 40 60 80 100
Differential Input Voltage VID (mV)
VCC = 5 V, Ta = 25°C
VIC = –7 V
VIC = 0 V
VIC = +7 V
Input applied to pin A,
with pin B as reference
Figure 3 Differential Input Voltage vs. Output Voltage Characteristics
VCC
Y
R
R
A
B
Figure 4 Fail-Safe Function
This is because, since the termination resistance is normally matched to the transmission line characteristic
impedance, the value falls to several tens of hundreds of ohms, and the differential input pins are shorted by
this termination resistance. That is, the differential input voltage V
ID comes within the range
V
ID:
–0.2 V < V
IA – VIB < 0.2 V
and the output becomes undetermined.
To prevent this, resistance R
1 is inserted in series with the transmission line as shown in figure 6,
minimizing the effect of the termination resistance. Resistance R
2 is added to increase the current flowing
between the termination resistance and R
1, enabling the value of R1 to be kept small.
Inserting resistances R
1 and R2 in this way provides for the differential input voltage VID to become 200 mV
or higher, but the following points must be noted.
• Smallest possible R
1 value
If this value is large, the receiver input sensitivity will fall.
• Largest possible R
2 value
If this value is small, the load on the driver will be large.
Figure 7 shows experimental differential input voltages for variations in R
1 and R2.


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