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PDF HD26LS31 Data sheet ( Hoja de datos )
| Número de pieza | HD26LS31 | |
| Descripción | Quadruple Differential Line Drivers | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD26LS31
Quadruple Differential Line Drivers With 3 State Outputs
ADE-205-576 (Z)
1st. Edition
Dec. 2000
Description
The HD26LS31 features quadruple differential line drivers which satisfy the requirements of EIA standard
RS-422A. This device is designed to provide differential signals with high current capability on bus lines.
The circuit provides enable input to control all four drivers. The output circuit has active pull up and pull
down and is capable of sinking or sourcing 40 mA.
Logic Diagram
1A
2A
3A
4A
Enable G
Enable G
1Y
1Z
2Y
2Z
3Y
3Z
4Y
4Z
1 page  
HD26LS31
Test Circuit 1
4.5 V
Input
Pulse Generator
PRR = 1MHz
Duty Cycle 50%
Zout = 50Ω
G
G
A
Note:
1. CL includes probe and jig capacitance.
Waveforms
Output
Z
Y
Output
CL =
30 pF
CL =
30 pF
Input
Output Y
Output Z
tr
0.3 V
2.7 V
1.3 V
tPLH
1.5 V
tPHL
Skew
1.5 V
tf
2.7 V
1.3 V
0.3 V
tPHL
1.5 V
tPLH
Skew
1.5 V
3V
0V
VOH
VOL
VOH
VOL
5
5 Page 
"H" IOH
Y
RT
"L" RT
Z IIN (Receiver)
RT =
ZO
2
ZO is the transmission line characteristic
impedance
HD26LS31
Figure 5 Example of Driver Use-1
5 VOH (Y)
2
1.0
0.5
0.2
0.1
0.05
10 20
VOL (Z)
"H"
50 100 200 500 1 k 2 k 5 k 10 k 20 k 50 k
Termination Resistance RT (Ω)
Y
Z
VCC = 5 V
Ta = 25°C
RT
RT VOH
GND VOL
Figure 6 Termination Resistance vs. Output Voltage Characteristics
Y "H" IOH
RT
"L"
Z IOL IIN (Receiver)
RT = ZO
ZO is the transmission line characteristic
impedance
Figure 7 Example of Driver Use-2
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet HD26LS31.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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