HD26C31
Quadruple Differential Line Drivers With 3 State Outputs
REJ03D0292–0200Z
(Previous ADE-205-574 (Z))
Rev.2.00
Jul.16.2004
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
• Ordering Information
Part Name
HD26C31FPEL
Package Type
SOP-16 pin (JEITA) FP-16DAV
Rev.2.00, Jul.16.2004, page 1 of 11
Package
Abbreviation
Package Code
FP
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
HD26C31
Pin Arrangement
1A 1
16 VCC
1Y 2
15 4A
1Z 3
14 4Y
Enable G 4
13 4Z
2Z 5
12 Enable G
2Y 6
11 3Z
2A 7
10 3Y
GND 8
9 3A
(Top view)
Function Table
Input
A
Enables
G
Outputs
Y
G
Z
H
L
H
H
X
X
H
L
L
H
H
L
X
X
L
L
H
L
L
H
X
H
L
X
Z
L
H
Z
Z
:
:
:
:
High level
Low level
Irrelevant
High impedance
Absolute Maximum Ratings (Ta = 25°C)
Supply Voltage*2
Item
VCC
Symbol
Ratings
–0.5 to 7.0
V
Unit
Input Voltage
Output Voltage
VIN
VOUT
–1.5 to VCC +1.5
–0.5 to VCC +0.5
V
V
Power Dissipation
Storage Temperature Range
PT
Tstg
500
–65 to 150
mW
°C
Lead Temperature*3
Output Current
Tlead
IOUT
260
±150
°C
mA
Supply Current
ICC
±150
mA
Notes: 1. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two
of which may be realized at the same time.
2. The values is defined as of ground terminal.
3. The values at 1.6 mm away from the package within 10 second, when soldering.
Rev.2.00, Jul.16.2004, page 2 of 11
HD26C31
Recommended Operating Conditions (Ta = –40°C to +85°C)
Item
Symbol
Min
Typ
Max
Unit
Supply Voltage
Input Voltage
VCC
VIN
4.5
0
5.0
—
5.5
VCC
V
V
Output Voltage
Operating Temperature
VOUT
Ta
0
–40
—
25
VCC
85
V
°C
Input Rise/Fall Time*1
tr, tf
—
—
500
ns
Note:
1. This guarantees maximum limit when one input switches.
Logic Diagram
1A
2A
1Y
1Z
2Y
2Z
3A
3Y
3Z
4A
Enable G
Enable G
Rev.2.00, Jul.16.2004, page 3 of 11
4Y
4Z
HD26C31
Electrical Characteristics (Ta = –40°C to +85°C)
Item
Symbol
Min
Typ
Max
Unit
Conditions
Input Voltage
VIH
VIL
2.0
—
—
—
—
0.8
V
V
Output Voltage
VOH
VOL
2.4
—
3.4
0.2
—
0.4
V
V
VIN = VIH or VIL, IOH = –20 mA
VIN =VIH or VIL, IOL = 20 mA
Differential Output Voltage
VT
2.0
3.1
—
V
RL = 100 Ω
VT
50
Ω
50
Ω
Difference In Differential
Output
Common ModeOutput
Voltage
Difference In Output
Common Mode
IVTI – IVTI
—
—
0.4
V
VOS
—
1.8
3.0
V
IVOS – VOSI —
—
0.4
V
Input Current
Supply Current
IIN
ICC
—
—
—
200
±1.0
500
µA
µA
VIN = VCC, GND, VIH or VIL
IOUT = 0 µA, VIN = VCC or GND
Off State Output Current
ICC*2
IOZ
—
—
0.8
±0.5
2.0
±5.0
mA
µA
IOUT=0 µA, VIN = 2.4 V or 0.5 V
VOUT = VCC or GND, G = VIL, G = VIH
–30
—
—
—
–150 mA
100 µA
Short Circuit Output Current ISC*3
Output Current with Power IOFF
VOS
VIN = VCC or GND
VCC = 0 V, VOUT = 6 V
Off
IOFF
—
—
–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.
Switching Characteristics (Ta = –40°C to +85°C, VCC = 5 V ± 10%)
Item
Symbol
Min
Typ
Max
Unit
Conditions
Propagation Delay Time
tPLH
tPHL
2.0
2.0
6.0
6.0
11.0
11.0
ns
ns
Output To Output Skew
Differential Output Transition Time
Skew
tTLH
—
0.5
6.0
2.0
10.0
ns
ns
Test Circuit (3)
Output Enable Time
tTHL
tZL
6.0
11.0
10.0
19.0
ns
ns
Test Circuit (2)
Output Disable Time
tZH
tLZ
—
—
13.0
5.0
21.0
9.0
ns
ns
Power Dissipation Capacitance
tHZ
CPD
—
—
7.0
50.0
11.0
—
ns
pF
Input Capacitance
CIN
—
6.0
—
pF
Rev.2.00, Jul.16.2004, page 4 of 11
Test Circuit (1)
HD26C31
Test Circuit 1
VCC
Input
Output
Palse Generator
C2
Y
A
C1
Zout = 50 Ω
Z
C3
VCC G
R1
R3
1.5 V
S1
OPEN
R2
Output
G
Note:
1. C1, C2 and C3 (40 pF) include probe and jig capacitance.
R1 = R2 = 50 Ω, R3 = 500 Ω
Waveforms 1
tr
tf
90 %
1.3 V
Input A
3V
90 %
1.3 V
10 %
10 %
t PLH
0V
t PHL
VOH
Output Y
1.3 V
1.3 V
VOL
t PHL
t PLH
VOH
1.3 V
Output Z
1.3 V
VOL
VOH
Output Y
50 %
50 %
VOL
Skew
Skew
VOH
Output Z
50 %
50 %
VOL
Notes:
1. tr≤ 6 ns, t f≤ 6 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
Rev.2.00, Jul.16.2004, page 5 of 11
HD26C31
Test Circuit 2
VCC
VCC
Output
A
C2
Y
Input
C1
Z
Pulse Generater
Zout = 50 Ω
Notes:
C3
G
R1
R3
1.5 V
S1
CLOSED
R2
Output
G
1. tr≤ 6 ns, t f≤ 6 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
Waveforms 2
tr
Enable G
Enable G
tf
90 %
1.3 V
3V
90 %
1.3 V
10 %
10 %
t LZ
0V
t ZL
1.5 V
Output Y
VOL + 0.3 V
0.8 V
VOL
t HZ
t ZH
VOH
Output Z
VOH – 0.3 V
2.0 V
1.5 V
Notes:
1. tf≤ 6 ns, t f≤ 6 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
Rev.2.00, Jul.16.2004, page 6 of 11
HD26C31
Test Circuit 3
Input
Pulse Generator
A
C1
Output
Zout = 50 Ω
R1
R3
C2
Y
Z
1.5 V
S1
OPEN
C3
R2
VCC G
G
Ach
Bch
Oscilloscope
Bch Invert
Ach Add Bch
Note:
1. C1, C2 and C3 (40 pF) include probe and jig capacitance.
R1 = R2 = 50 Ω, R3 = 500 Ω
Waveforms 3
tr
tf
90 %
Input A
10 %
10 %
90 %
Output
(Differential)
90 %
10 %
1. tr≤ 6 ns, t f≤ 6 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
Rev.2.00, Jul.16.2004, page 7 of 11
0V
10 %
t TLH
Notes:
3V
90 %
t THL
HD26C31
HD26C31 Line Driver Applications
The HD26C31 is a line driver that meets the EIA RS-422A conditions, and has been designed to supply a high current
for differential signals to a bus line. Its features are listed below.
•
•
•
•
Operates on a single 5 V power supply.
High output impedance when power is off
Sink current and source current both 20 mA
On-chip power up/down protection circuit
As shown by the logic diagram, the enable function is common to all four drivers, and either active-high or active-low
can be selected.
The output section consists of two output stages (the Y side and Z side), each of which has the same sink current and
source current capacity.
Connection of a termination resistance when the HD26C31 is used as a balanced differential type driver is shown.
Output Characteristics ("H" Level)
Output Voltage VOH (V)
5.0
Ta = 25°C
4.0
3.0
VCC = 5.5 V
VCC = 5.0 V
2.0
1.0
0
VCC = 4.5 V
–20
–40
–60
–80
Output Current IOH (mA)
–100
Figure 1 IOH vs. VOH Characteristics
Output Characteristics ("L" Level)
Output Voltage VOL (V)
0.5
0.4
0.3
0.2
Ta = 25°C
VCC = 4.5 V
VCC = 5.0 V
VCC = 5.5 V
0.1
0
20
40
60
80
Output Current IOL (mA)
100
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.
Rev.2.00, Jul.16.2004, page 8 of 11
HD26C31
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.
Y
"H"
IOH
RT
"L"
Z
IOL
IIN (Receiver)
Figure 3 Example of Driver Use-1
Y
"H"
IOH
RT
"L"
RT
Z
IIN (Receiver)
Figure 4 Example of Driver Use-2
Output Voltage VOH(Y), VOL(Z) (V)
Output Voltage vs. Termination Resistance
10
VOH(Y)
1
Y
RT
"H"
0.1
RT
Z
0.01
0.001
10 20
VOH
GND
VOL
VOL(Z)
50 100 200 500 1k 2k
5k 10k 20k 50k
Termination Resistance RT (Ω)
Figure 5 Termination Resistance vs. Output Voltage Characteristics
A feature of termination implemented as shown in figure 7 is that power dissipation is low when the duty of the
transmitted signal is high.
However, care is required, since if RT is sufficiently small, when the output on the pulled-up side goes high, a large
current will flow and the output low level will rise.
Figure 8 shows the output characteristics when termination resistance RT is varied.
Rev.2.00, Jul.16.2004, page 9 of 11
HD26C31
Output Voltage VOH(Y), VOL(Z) (V)
Output Voltage vs. Termination Resistance
10
VOH(Y)
1
VCC = 5 V
Ta = 25°C
Y
RT
"H"
0.1
VOL(Z)
VOH
Z
0.01
0.001
10 20
GND
VOL
50 100 200 500 1k 2k
5k 10k 20k 50k
Termination Resistance RT (Ω)
Figure 6 Termination Resistance vs. Output Voltage Characteristics
VCC
Y
RT
Data input
Z
RT
Figure 7 Example of Driver Use-3
Output Voltage VOH(Z), VOL(Y) (V)
Output Voltage vs. Termination Resistance
10
VOH(Z)
1
Y
0.1
VOL(Y)
0.001
10 20
VCC = 5 V
Ta = 25°C
"L"
VOL
Z
0.01
RT
RT
GND
50 100 200 500 1k 2k
5k 10k 20k 50k
Termination Resistance RT (Ω)
Figure 8 Termination Resistance vs. Output Voltage Characteristics
Rev.2.00, Jul.16.2004, page 10 of 11
VOH
HD26C31
Package Dimensions
As of January, 2003
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.20 ± 0.05
2.20 Max
5.5
16
0.20
7.80 +– 0.30
1.15
0 ˚ – 8˚
0.70 ± 0.20
0.15
0.12 M
*Ni/Pd/Au plating
Rev.2.00, Jul.16.2004, page 11 of 11
Package Code
JEDEC
JEITA
Mass (reference value)
FP-16DAV
—
Conforms
0.24 g
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