DS26F32M
Quad Differential Line Receivers
General Description
The DS26F32 is a quad differential line receiver designed to
meet the requirements of EIA Standards RS-422 and
RS-423, and Federal Standards 1020 and 1030 for balanced
and unbalanced digital data transmission.
The DS26F32 offers improved performance due to the use
of state-of-the-art L-FAST bipolar technology. The L-FAST
technology allows for higher speeds and lower currents by
utilizing extremely short gate delay times. Thus, the
DS26F32 features lower power, extended temperature
range, and improved specifications.
The device features an input sensitivity of 200 mV over the
input common mode range of
7.0V. The DS26F32 provides
an enable function common to all four receivers and
TRI-STATE
outputs with 8.0 mA sink capability. Also, a
fail-safe input/output relationship keeps the outputs high
when the inputs are open.
The DS26F32 offers optimum performance when used with
the DS26F31 Quad Differential Line Driver.
Features
n
Military temperature range
n
Input voltage range of
7.0V (differential or common
mode)
0.2V sensitivity over the input voltage range
n
Meets all the requirements of EIA standards RS-422 and
RS-423
n
High input impedance (18k typical)
n
30 mV input hysteresis
n
Operation from single +5.0V supply
n
Input pull-down resistor prevents output oscillation on
unused channels
n
TRI-STATE outputs, with choice of complementary
enables, for receiving directly onto a data bus
n
Propagation delay 15 ns typical
Connection Diagrams
Function Table
(Each Receiver)
Differential Inputs
Enables
Outputs
V
ID
= (V
IN
+) - (V
IN
-)
E
E
OUT
V
ID
0.2V
H
X
H
X
L
H
V
ID
-0.2V
H
X
L
X
L
L
X
L
H
Z
H = High Level
L = Low Level
X = Immaterial
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
16-Lead DIP
DS009615-1
Top View
See NS Package Number J16A
For Complete Military Product Specifications,
refer to the appropriate SMD or MDS.
Order Number DS26F32ME/883,
DS26F32MJ/883 or DS26F32MW/883
See NS Package Number E20A, J16A or W16A
20-Lead Ceramic Leadless Chip Carrier
DS009615-7
May 1999
DS26F32MQuad
Differential
Line
Receivers
1999 National Semiconductor Corporation
DS009615
www.national.com
Absolute Maximum Ratings
(Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Ceramic DIP
-65C + to 175C
Operating Temperature Range
DS26F32M
-55C to +125C
DS26F32C
0C to +70C
Lead Temperature
Ceramic DIP (soldering, 60
sec)
300C
Maximum Power Dissipation (Note 1) at 25C
Cavity Package
1500 mW
Supply Voltage
7.0V
Common Mode Voltage Range
25V
Differential Input Voltage
25V
Enable Voltage
7.0V
Output Sink Current
50 mA
Operating Range
DS26F32M
Temperature
-55C to +125C
Supply Voltage
4.5V to 5.5V
Note 1: Derate cavity package 10 mW/C above 25C.
Electrical Characteristics
(Notes 3, 4)
Over operating range, unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
TH
Differential Input Voltage
-7.0V
V
CM
+7.0V,
-0.2
0.06
+0.2
V
V
O
= V
OL
or V
OH
R
I
Input Resistance
-15V
V
CM
+15V,
14
18
k
One Input AC Ground
I
I
Input Current (under Test)
V
I
= +15V,
2.3
Other Input -15V
V
I
+15V
mA
V
I
= -15V,
-2.8
Other Input -15V
V
I
+15V
V
OH
Output Voltage HIGH
V
CC
= Min,
0C to +70C
2.8
3.4
V
I
= +1.0V,
V
V
ENABLE
= 0.8V,
-55C to +125C
2.5
3.4
I
OH
= -440 A
V
OL
Output Voltage LOW
V
CC
= Min,
I
OL
= 4.0 mA
0.4
V
I
= -1.0V,
I
OL
= 8.0 mA
0.45
V
V
ENABLE
= 0.8V
V
IL
Enable Voltage LOW
0.8
V
V
IH
Enable Voltage HIGH
2.0
V
V
IC
Enable Clamp Voltage
V
CC
= Min, I
I
= -18 mA
-1.5
V
I
OZ
Off State (High Impedance)
V
CC
= Max
V
O
= 2.4V
20
A
Output Current
V
O
= 0.4V
-20
I
IL
Enable Current LOW
V
I
= 0.4V
-0.2
-0.36
mA
I
IH
Enable Current HIGH
V
I
= 2.7V
0.5
10
A
I
I
Enable Input High Current
V
I
= 5.5V
1.0
50
A
I
OS
Output Short Circuit Current
V
O
= 0V, V
CC
= Max, (Note 5)
-15
-50
-85
mA
V
I
= +1.0V
I
CC
Supply Current
V
CC
= Max, All V
I
= GND,
30
50
mA
Outputs Disabled
V
HYST
Input Hysteresis
T
A
= 25C, V
CC
= 5.0V, V
CM
= 0V
30
mV
Note 2: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of "Electrical Characteristics" provide conditions for actual device operation.
Note 3: Unless otherwise specified min/max limits apply across the -55C to +125C temperature range for the DS26F32M and across the 0C to +70C range for
the DS26F32C. All typicals are given for V
CC
= 5V and T
A
= 25C.
Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are reference to ground unless otherwise specified.
Note 5: Only one output at a time should be shorted.
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2
Switching Characteristics
(Continued)
Typical Application
DS009615-5
Note 6: Diagram shown for ENABLE Low.
Note 7: S1 and S2 of Load Circuit are closed except where shown.
Note 8: Pulse Generator of all Pulses: Rate
1.0 MHz, Z
O
= 50
, t
r
6.0 ns, t
f
6.0 ns.
Note 9: All diodes are IN916 or IN3064.
Note 10: C
L
includes probe and jig capacitance.
FIGURE 4. Enable and Disable Times (Notes 6, 7, 8)
DS009615-6
FIGURE 5.
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4
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