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PDF 26C31 Data sheet ( Hoja de datos )
| Número de pieza | 26C31 | |
| Descripción | Quadruple Differential Line Drivers | |
| Fabricantes | Hitachi Semiconductor | |
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26C31-SMD
Quadruple Differential Line Drivers With 3 State Outputs
ADE-205-574 (Z)
1st. Edition
Dec. 2000
Description
The HD26C31 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 20 mA.
Features
• TTL input compatibility
• Propagation delay time: 6 ns typ
• Output to output skew: 0.5 ns typ
• High output impedance in power off conditions
• Meets EIA standard RS-422A
• Operates from a single 5 V supply
• Three state outputs
• Low power dissipation with CMOS process
• Power up and power down protection
• Pin to pin compatible with HD26LS31
www.sycelectronica.com.ar
1 page  
HD26C31
Electrical Characteristics (Ta = –40°C to +85°C)
Item
Symbol
Input Voltage
Output Voltage
Differential Output Voltage
VIH
VIL
VOH
VOL
VT
Min Typ Max Unit
2.0 — — V
— — 0.8 V
2.4 3.4 — V
— 0.2 0.4 V
2.0 3.1 — V
Conditions
VIN = VIH or VIL, IOH = –20 mA
VIN =VIH or VIL, IOL = 20 mA
RL = 100 Ω
50
VT Ω
50
Ω
VOS
Difference In Differential IVTI – IVTI — — 0.4 V
Output
Common ModeOutput
Voltage
VOS
— 1.8 3.0 V
Difference In Output
Common Mode
IVOS – VOSI — — 0.4 V
Input Current
I IN
— — ±1.0 µA
VIN = VCC, GND, VIH or VIL
Supply Current
I CC
— 200 500 µA
IOUT = 0 µA, VIN = VCC or GND
I CC* 2
— 0.8 2.0 mA
IOUT=0 µA, VIN = 2.4 V or 0.5 V
Off State Output Current IOZ
— ±0.5 ±5.0 µA
VOUT = VCC or GND, G = VIL, G = VIH
Short Circuit Output Current ISC*3
–30 —
–150 mA
VIN = VCC or GND
Output Current with Power IOFF
— — 100 µA
VCC = 0 V, VOUT = 6 V
Off
I OFF
— — –100 µA
VCC = 0 V, VOUT = –0.25 V
Notes: 1. All typical values are at VCC = Ta = 25°C.
2. 1 input: VIN = 2.4 V or 0.5 V, other inputs: VIN = VCC or GND
3. Not more than one output should be shorted at a time and duration of the short circuit should not
exceed one second.
www.sycelectronica.com.ar
5
5 Page 
Output Characteristics ("L" Level)
0.5
Ta = 25°C
0.4
VCC = 4.5 V
0.3 VCC = 5.0 V
0.2 VCC = 5.5 V
0.1
HD26C31
0 20 40 60 80 100
Output Current IOL (mA)
Figure 2 IOL vs. VOL Characteristics
When termination resistance RT is connected between the two transmission lines, as shown in figure 3 the
current path situation is that current IOH on the side outputting a high level (in this case, the Y output) flows
to the side outputting a low level (in this case, the Z output) via RT, with the result that the low level rise is
large.
If termination resistance RT is dropped to GND on both transmit lines, as shown in figure 4 the current path
situation is that the current that flows into the side outputting a low level (in this case, the Z output) is only
the input bias current from the receiver. As this input bias current is small compared with the signal
current, it has almost no effect on the differential input signal at the receiver end.
Figure 5 shows the output voltage characteristic when termination resistance RT is varied.
Also, when used in a party line system, etc., the low level rises further due to the receiver input bias
current, so that it is probably advisable to drop the termination resistance to GND.
However, the fact that it is possible to make the value of RT equal to the characteristic impedance of the
transmission line offers the advantage of being able to hold the power dissipation on the side outputting a
high level to a lower level than in the above case.
Consequently, the appropriate use must be decided according to the actual operating conditions
(transmission line characteristics, transmission distance, whether a party line is used, etc.).
Figure 6 shows the output characteristics when termination resistance RT is varied.
www.sycelectronica.com.ar
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet 26C31.PDF ] | |
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