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April 1st, 2010
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Rev.2.00, Jul.16.2004, page 1 of 14
HD26LS32
Quadruple Differential Line Receivers With 3 State Outputs
REJ03D0295–0200Z
(Previous ADE-205-577 (Z))
Rev.2.00
Jul.16.2004
Description
The HD26LS32 features quadruple line receivers designed to meet the specs of EIA standard RS-422A and RS-423.
This device operates from a single 5 V power supply. The enable function is common to all four receivers and offers a
choice of active high or active low input. Fail safe design ensures that if the inputs are open, the outputs will always be
high.
Features
• Ordering Infor mation
Part Name Package Type Package Code Package
Abbreviation Taping Abbreviation
(Quantity)
HD26LS32P DILP-16 pin (JEITA) DP-16E, -16FV P —
HD26LS32FPEL SOP-16 pin (JEITA) FP-16DAV FP EL (2,000 pcs/reel)
Note: Please consults the sales office for the above package availability.
Logic Diagram
1Y
2Y
3Y
4Y
1A
1B
2A
2B
3A
3B
4A
4B
Enable G
Enable G
HD26LS32
Rev.2.00, Jul.16.2004, page 2 of 14
Pin Arrangement
(Top view)
1
2
3
4
5
6
7
1B
GND
1A
1Y
2Y
8
Enable G
2A
2B
13
14
15
10
11
12
9
16 VCC
4B
4A
4Y
Enable G
3Y
3A
3B
Function Table
Differential Input Enable Output
A – B G G
GG
GY
VID ≥ V TH HXH
XLH
VTL < VID < VTH HX?
XL?
VID ≤ V TL HXL
XLL
XLHZ
H : High level
L : Low level
X : Immaterial
? : Irrelevant
Z : High impedance
HD26LS32
Rev.2.00, Jul.16.2004, page 3 of 14
Absolute Maximum Ratings
Item Symbol Ratings Unit
Supply Voltage VCC*17.0 V
In Phase Input Voltage VIC ±25 V
Differential Input Voltage VID*2±25 V
Enable Input Voltage VIN 7V
Output Sink Current Iout 50 mA
Continuous Total Dissipation PT1W
Operating Temperature Range Topr 0 to +70 °C
Storage Temperature Range Tstg –65 to 150 °C
Notes: 1. All voltage values except for differential input voltage are with respect to network ground terminal.
2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting
onput.
3. 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.
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply Voltage VCC 4.75 5.00 5.25 V
In Phase Input Voltage VIC ——±7.0V
Output Current IOH — — –440 µA
IOL ——8 mA
Operating Temperature Topr 0 — 70 °C
HD26LS32
Rev.2.00, Jul.16.2004, page 4 of 14
Electrical Characteristics (Ta = 0 to +70°C)
Item Symbol Min Typ*1Max Unit Conditions
Differential Input High
Threshold Voltage
VTH ——0.2VV
IC = –7 to +7 V VOH = 2.7 V, IOH = –440 µA
Differential Input Low VTL — — –0.2 VOL = 0.4 V, IOL = 4 mA
Threshold Voltage — — –0.2 VOL = 0.45 V, IOL = 8 mA
Input Hysteresis*2VTH – VTL —30—mV
Enable Input Voltage VIH 2.0——V
VIL ——0.8
Enable Input Clamp
Voltage
VIK ——1.5 V
CC = 4.75 V, IIN = –18 mA
Output Voltage VOH 2.7 — — VCC = 4.75 V VID = 1 V, IOH = –440 µA
VOL ——0.4 V
IL (G) = 0.8 V VID = –1 V, IOL = 4 mA
— — 0.45 VID = –1 V, IOL = 8 mA
Off State (High IOZ ——20µAV
CC = 5.25 V VO = 2.4 V
Impedance) Output
Current
— — –20 VO = 0.4 V
Line Input Current II—
—
—
—
2.3
2.8
mA VI = 15 V, Other Inputs –10 to +15 V
VI = –15 V, Other Inputs –15 to +10 V
Enable Input Current II (EN) — — 100 µA VI = 5.5 V
IIH ——20 V
I = 2.7 V
IIL — — –0.36 mA VI = 0.4 V
Input Resistance ri 6 9.8 — kΩVIC = –15 to +15 V (Other Inputs AC GND)
Short Circuit Output
Current
IOS*3–15 — –85 mA VCC = 5.25 V
Supply Current ICC —5270 V
CC = 5.25 V, VI = 0 V (All Outputs Disable)
Notes: 1. All typical values are at VCC = 5 V, Ta = 25°C,VIC = 0.
2. Hysteresis is the differential between the positive going input threshold voltage and the negative going input
threshold voltage.
3. Not more than one output should be shorted at a time.
Switching Characteristics (VCC = 5 V, Ta = 25°C)
TItem Symbol Min typ Max Unit Conditions
Propagation Delay Time tPLH, tPHL —1725nsC
L = 15 pF
Output Enable Time tZH, tZL —1522
Output Disable Time tHZ —1522 C
L = 5 pF
tLZ —2030
HD26LS32
Rev.2.00, Jul.16.2004, page 5 of 14
1. tPLH, tPHL
Test circuit
Pulse
Generator
Input
CL
Output
Ω2 k
VCC
Ω5 k
2 V
*1
*2
*3
Waveforms
Input A 0 V 0 V
0 V 0 V
tPLH
OH
VOL
V
1.3 V
2.5 V
–2.5 V
2.5 V
–2.5 V
tPHL
1.3 V
Input B
Output
HD26LS32
Rev.2.00, Jul.16.2004, page 6 of 14
2. tHZ, tZH
Test circuit
Input
Pulse
Generator
2.5 V
2 V
CL
Output Ω2 k
VCC
Ω5 k
S1
*1
*2
*3
*4
Waveforms
Enable G 1.3 V 1.3 V
1.3 V 1.3 V
tZH
OH
V
1.3 V
3 V
0 V
3 V
0 V
tHZ
0.5 V
Output
Enable G
S1 : Open
0 V
1.4 V
S1 : Closed
HD26LS32
Rev.2.00, Jul.16.2004, page 7 of 14
3. tLZ, tZL
Test circuit
Input
Pulse
Generator
–2.5 V
2 V
CL
Output Ω2 k
VCC
Ω5 k
S2
Waveforms
Enable 1.3 V 1.3 V
1.3 V 1.3 V
tZL
OH
VOL
V
1.3 V
3 V
0 V
3 V
0 V
tLZ
0.5 V
Output
Enable G
S2 : Open S2 : Closed
1.4 V
Notes: 1. The pulse generator has the following characteristics :
PRR = 1 MHz, 50 % duty cycle, tr ≤ 15 ns, t f ≤ 6 ns, Zout = 50 Ω.
2. CL includes probe and jig capacitance.
3. All diodes are 1S2074 (H)
4. To test G input,ground G input and apply an inverted input waveform.
HD26LS32
Rev.2.00, Jul.16.2004, page 8 of 14
HD26LS32 Line Receiver Applications
The HD26LS32 is a line receiver that meets the EIA RS-422A and RS-423A conditions. It has a high in-phase input
voltage range, both positive and negative, enabling highly reliable transmission to be performed even in noisy
environments.
Its main features are listed belo w.
• Operates on a single 5 V power supply.
• Three-state output
• On-c hip fai l -sa fe cir cu i t
• ±7 V in-phase input voltage range
• ±200 mV input sensitivity
• Minimum 6 kΩ input r e sistance
A block diagram is shown in figure 1. The enable function is common to all four drivers, and either active-high or
active-low input can be selected .
When exchange is carried out using a party line system, it is better to keep the receiver input bias current constituting
the driver load small, as this allows more receivers to be connected.
Consequently, whereas an input resistance of 4 kΩ or above is stipulated in RS-422A and RS-423A, the HD26LS32 has
been designed to allow a greater margin, with a minimum resistance of 6 kΩ.
Figure 2 shows the input current characteristics of the HD26LS32.
The shaded areas in the graph indicate the input current allowable range stipulated in RS-422A and RS-423A.
HD26LS32 output is LS-TTL compatible and has a three-state function, enabling the output to be placed in the high-
impedance state, and so making the device suitable for bus line type applications.
With an in-phase input voltage range of ±7 V and a ±200 mV input sensitivity, the HD26LS32 can withstand use in
noisy envi ronments.
Also, since signals sent over a long-distance transmission line require a long transition time, it also takes a long time to
cross the receiver’s input threshold level.
Therefore, the input is provided with hysteresis of around 30 mV to prevent receiver output misoperation due to noise.
An example of input hysteresis is shown in figure 3.
The fail-safe function consists of resistances R connecting input A to VCC and input B to GND, as shown in figure 4.
This circuit provides for the receiver input section to be pulled up or down by a high resistance that prevents it from
becoming a driver load so that the output goes high in the event of a transmission line breakage or connector
detachment.
When the input pin is placed in the open state by the pull-up/pull-down resistance, the differential input voltage VID is
as follows:
VID: (VIA – VIB) ≥ 0.2 V
and t he output is fixed high.
However, if the receiver-side termination resistance remains connected despite a line breakage or connector detachment,
the output will be undetermined (figure 5).
HD26LS32
Rev.2.00, Jul.16.2004, page 9 of 14
1Y
2Y
3Y
4Y
1A
1B
2A
2B
3A
3B
4A
4B
Enable G
Enable G
Figure 1 HD26LS32 Block Diagram
5
4
3
2
1
0
–1
–2
–3
–4
–5
–25 –20 –15 –10 –5 0 5 10152025
Input Voltage Vin (V)
Input Current Iin (mA)
Ta = 25°C+3.25 mA
V
CC
= 0 V
V
CC
= 5.25 V
–3.25 mA
–10 V –3 V
+3 V +10 V
Figure 2 Input Voltage vs. Input Current Characteristics
5
4
3
2
1
0
–100 – 80 –60 –40 –20 0 20 40 60 80 100
Differential Input Voltage VID (mV)
Output Voltage Vout (V)
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
HD26LS32
Rev.2.00, Jul.16.2004, page 10 of 14
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 VID comes within the range
VID: –0.2 V < VIA – VIB < 0.2 V
and the outp ut beco mes undetermined.
To prevent this, resistance R1 is inserted in series with the transmission line as shown in figure 6, minimizing the effect
of the termination resistance. Resistance R2 is added to increase the current flowing between the termination resistance
and R1, enabling the value of R1 to be kept small.
Inserting resistances R1 and R2 in this way provides for the differential input volta ge VID to become 200 mV or higher,
but the following points must be noted.
• Smallest possible R1 va lue
If this value is large, the receiver input sensitivit y will fall.
• Largest possible R2 val ue
If this value is small, the load on the driver will be large.
Figure 7 shows experimental differential input voltages for variations in R1 and R2.
"H"
R
T
R
T
Undetermined
Figure 5 Examples of Transmission Line Disconnection
Receive
r
V
CC
R
2
R
2
R
1
R
1
R
T
Driver
Figure 6 Method of Enhancing Fail-Safe Function
0.6
0.5
0.4
0.3
0.2
0.1
0 5 10 15
R1 (kΩ)
Differential Input Voltage VID (V)
R
2
= 30 kΩ
50 kΩ
100 kΩ
300 kΩ
R
2
= ∞
VCC = 5 V
Ta = 25°C
VCC
R2
VID
R2
R1
R1
100 Ω
Figure 7 R1, R2 vs. Differential Input Voltage
HD26LS32
Rev.2.00, Jul.16.2004, page 11 of 14
RS-442A Interface Standard Applications
Figure 9 shows sample operation waveforms at various points with 1200 m and 12 m cable lengths.
1. Unidirection al Transmission (1 : 1 Configuratio n)
Receiver
Data
output
F
D
E
Driver B
C
AData
input R
T
Figure 8 1 : 1 Unidirectional Transmission
: 1200 m
: 100 kHz
Line
Frequency
: 5 µs/div
: 2 V/div
H
V
: 50%
: 100 Ω
Duty
R
T
: 12 m
: 10 MHz
Line
Frequency
: 50 ns/div
: 2 V/div
H
V
: 50%
: 100 Ω
Duty
R
T
A
GND
C
GND
B
GND
D
GND
F
GND
E
GND
A
GND
C
GND
B
GND
D
GND
F
GND
E
GND
Figure 9 Sample Transmission Waveforms
HD26LS32
Rev.2.00, Jul.16.2004, page 12 of 14
2. Unidirectional Transmission (1 : n Configuration)
Driver
Data
input R
T
Data
output
Data
output
Receiver
R
T
Data
output
Enable
Data
output
Figure 10 1 : n Unidirectional Transmission
With this connection method, n receivers are connected for one driver. In the RS-422A standard, ten receivers can be
connected simultaneously for one driver.
Conversely, it is also possible to connect one receiver for n drivers.
3. Bidirectional Tr ans mission
Driver Receiver
Data I/O
Enable
DriverReceiver
Data I/O
Enable
R
T
R
T
Figure 11 Bidirectional Transmission
When bidirectional data exchange is performed using a combination of the HD26LS31 and HD26LS32, since either
high or low output control is possible, using complementary enable inputs for the driver and receiver makes it easy to
configure the kind of combination illustrated in figure 11 .
Extending this combination makes it possible to exchange n-bit data simultaneously, and handle a party line system.
HD26LS32
Rev.2.00, Jul.16.2004, page 13 of 14
Package Dimensions
16
18
9
19.2
20.32 Max
6.3
7.4 Max
5.06 Max2.54 Min
0.51 Min
Package Code
JEDEC
JEITA
Mass
(reference value)
DP-16E
Conforms
Conforms
1.05 g
2.54 ± 0.25 0.48 ± 0.1
0.89 1.3 7.62
0.25+ 0.1
– 0.05
0˚ – 15˚
As of January, 2003
Unit: mm
16
18
9
19.2
20.32 Max
6.3
7.4 Max
5.06 Max2.54 Min
0.51 Min
Package Code
JEDEC
JEITA
Mass
(reference value)
DP-16FV
Conforms
Conforms
1.05 g
2.54 ± 0.25
*NI/Pd/AU Plating
*0.48 ± 0.08
0.89 1.3 7.62
*0.25
± 0.06
0˚ – 15˚
Unit: mm
HD26LS32
Rev.2.00, Jul.16.2004, page 14 of 14
Package Code
JEDEC
JEITA
Mass
(reference value)
FP-16DAV
—
Conforms
0.24 g
*Ni/Pd/Au plating
*0.20 ± 0.05
*0.40 ± 0.06
0.12
0.15
M
2.20 Max
5.5
10.06
0.80 Max
16 9
18
10.5 Max
+ 0.20
– 0.30
7.80
0.70 ± 0.20
0˚ – 8˚
0.10 ± 0.10
1.15
1.27
As of January, 2003
Unit: mm
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