HD26C31
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
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
Enables
A
G
G
Y
Z
H
H
X
H
L
L
H
X
L
H
H
X
L
H
L
L
X
L
L
H
X
L
H
Z
Z
H
L
X
Z
2
:
:
:
:
High level
Low level
Irrelevant
High impedance
Outputs
HD26C31
Absolute Maximum Ratings (Ta = 25°C)
Item
Symbol
Ratings
Unit
Supply Voltage*
VCC
–0.5 to 7.0
V
Input Voltage
VIN
–1.5 to VCC +1.5
V
Output Voltage
VOUT
–0.5 to VCC +0.5
V
Power Dissipation
PT
500
mW
Tstg
–65 to 150
°C
Tlead
260
°C
Output Current
I OUT
±150
mA
Supply Current
I CC
±150
mA
2
Storage Temperature Range
Lead Temperature*
3
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.
Recommended Operating Conditions (Ta = –40°C to +85°C)
Item
Symbol
Min
Typ
Max
Unit
Supply Voltage
VCC
4.5
5.0
5.5
V
Input Voltage
VIN
0
—
VCC
V
Output Voltage
VOUT
0
—
VCC
V
Ta
–40
25
85
°C
t r, t f
—
—
500
ns
Operating Temperature
1
Input Rise/Fall Time*
Note:
1. This guarantees maximum limit when one input switches.
3
HD26C31
Logic Diagram
1A
2A
1Y
1Z
2Y
2Z
3A
3Y
3Z
4A
Enable G
Enable G
4
4Y
4Z
HD26C31
Electrical Characteristics (Ta = –40°C to +85°C)
Item
Symbol
Min
Typ
Max
Unit
Input Voltage
VIH
2.0
—
—
V
VIL
—
—
0.8
V
VOH
2.4
3.4
—
V
VIN = VIH or VIL, IOH = –20 mA
VOL
—
0.2
0.4
V
VIN =VIH or VIL, I OL = 20 mA
VT
2.0
3.1
—
V
RL = 100 Ω
Output Voltage
Differential Output Voltage
Conditions
VT
50
Ω
50
Ω
VOS
Difference In Differential
Output
IV TI – IVTI
—
—
0.4
V
Common ModeOutput
Voltage
VOS
—
1.8
3.0
V
Difference In Output
Common Mode
IV OS – VOSI —
—
0.4
V
Input Current
I IN
—
—
±1.0
µA
VIN = VCC, GND, VIH or VIL
Supply Current
I CC
—
200
500
µA
I OUT = 0 µA, VIN = VCC or GND
—
0.8
2.0
mA
I OUT =0 µA, VIN = 2.4 V or 0.5 V
—
±0.5
±5.0
µA
VOUT = VCC or GND, G = VIL, G = VIH
–30
—
–150 mA
Output Current with Power I OFF
—
—
100
Off
—
—
–100 µA
I CC*
Off State Output Current
2
I OZ
Short Circuit Output Current I SC*
I OFF
3
µA
VIN = VCC or GND
VCC = 0 V, VOUT = 6 V
VCC = 0 V, VOUT = –0.25 V
Notes: 1. All typical values are at VCC = Ta = 25°C.
2. 1 input: V IN = 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.
5
HD26C31
Switching Characteristics (Ta = –40°C to +85°C, VCC = 5 V ± 10%)
Item
Symbol
Min
Typ
Max
Unit
Conditions
Propagation Delay Time
t PLH
2.0
6.0
11.0
ns
Test Circuit (1)
t PHL
2.0
6.0
11.0
ns
Output To Output Skew
Skew
—
0.5
2.0
ns
Differential Output Transition Time
t TLH
6.0
10.0
ns
t THL
6.0
10.0
ns
t ZL
11.0
19.0
ns
Output Enable Time
t ZH
—
13.0
21.0
ns
t LZ
—
5.0
9.0
ns
t HZ
—
7.0
11.0
ns
Power Dissipation Capacitance
CPD
—
50.0
—
pF
Input Capacitance
CIN
—
6.0
—
pF
Output Disable Time
Test Circuit (3)
Test Circuit (2)
Test Circuit 1
VCC
Input
Palse Generator
Output
A
Zout = 50 Ω
C2
Y
C1
Z
C3
VCC G
Output
G
Note:
6
1.
C1, C2 and C3 (40 pF) include probe and jig capacitance.
R1 = R2 = 50 Ω, R3 = 500 Ω
R1
R3
1.5 V
S1
OPEN
R2
HD26C31
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.
2.
t r ≤ 6 ns, tf ≤ 6 ns
Input waveforms: PRR = 1 MHz, duty cycle 50%
7
HD26C31
Test Circuit 2
VCC
VCC
Output
A
C2
Y
Input
C1
Z
G
Pulse Generater
Zout = 50 Ω
Notes:
1.
2.
C3
R1
R3
1.5 V
S1
CLOSED
R2
Output
G
t r ≤ 6 ns, tf ≤ 6 ns
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:
8
1.
2.
t f ≤ 6 ns, tf ≤ 6 ns
Input waveforms: PRR = 1 MHz, duty cycle 50%
HD26C31
Test Circuit 3
Input
Pulse Generator
A
Output
Zout = 50 Ω
R1
R3
C2
Y
C1
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)
1.
2.
0V
90 %
10 %
10 %
t TLH
Notes:
3V
90 %
t THL
t r ≤ 6 ns, tf ≤ 6 ns
Input waveforms: PRR = 1 MHz, duty cycle 50%
9
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
10
HD26C31
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. V OL Characteristics
When termination resistance R T 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 R T 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.
11
HD26C31
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 R T 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.
12
HD26C31
Output Voltage VOH(Y), VOL(Z) (V)
Output Voltage vs. Termination Resistance
10
VOH(Y)
1
0.1
RT
"H"
VOL(Z)
VOH
Z
0.01
0.001
10 20
VCC = 5 V
Ta = 25°C
Y
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
0.1
Y
VOL(Y)
0.001
10 20
"L"
VOL
Z
0.01
VCC = 5 V
Ta = 25°C
RT
RT
GND
VOH
50 100 200 500 1k 2k
5k 10k 20k 50k
Termination Resistance RT (Ω)
Figure 8 Termination Resistance vs. Output Voltage Characteristics
13
HD26C31
Package Dimensions
Unit: mm
19.20
20.00 Max
6.30
9
1
7.40 Max
16
8
1.3
0.48 ± 0.10
7.62
2.54 Min 5.06 Max
2.54 ± 0.25
0.51 Min
1.11 Max
+ 0.13
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
10.06
10.5 Max
9
1
8
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
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
*Dimension including the plating thickness
Base material dimension
14
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-16DA
—
Conforms
0.24 g
HD26C31
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received the latest product standards or specifications before final design, purchase or use.
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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
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Colophon 2.0
15