DS9627
Dual Line Receiver
General Description
The DS9627 is a dual-line receiver which meets the electri-
cal
interface
specifications
of
EIA
RS-232C
and
MIL-STD-188C. The input circuitry accommodates
25V in-
put signals and the differential inputs allow user selection of
either inverting or non-inverting logic for the receiver opera-
tion. The DS9627 provides both a selectable hysteresis
range and selectable receiver input resistance. When pin 1
is tied to V
-
, the typical switching points are at 2.6V and
-2.6V, thus meeting RS-232-C requirements. When pin 1 is
open, the typical switching points are at 50 A and -50 A,
thus satisfying the requirements of MIL-STD-188C LOW
level interface. Connecting the RA and/or RB pins to the (-)
input yields an input impedance in the range of 3 k
to 7 k
and satisfies RS-232-C requirements; leaving RA and/or RB
pins unconnected, the input resistance will be greater than
6 k
to satisfy MIL-STD-188C.
The output circuitry is TTL/DTL compatible and will allow
"collector-dotting" to generate the wired-OR function. A TTL/
DTL strobe is also provided for each receiver.
Features
n
EIA RS-232-C input standards
n
MIL-STD-188C input standards
n
Variable hysteresis control
n
High common mode rejection
n
R control (5 k
or 10 k
)
n
Wired-OR capability
n
Choice of inverting and non-inverting inputs
n
Outputs and strobe TTL compatible
Connection Diagram
16-Lead DIP
DS009761-1
Top View
Order Number DS9627MJ/883
See NS Package Number J16A
For Complete Military 883 Specifications, see RETS Data Sheet.
February 1996
DS9627
Dual
Line
Receiver
1999 National Semiconductor Corporation
DS009761
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
-65C to +175C
Operating Temperature Range
-55C to +125C
Lead Temperature (Soldering, 60 sec.)
300C
Internal Power Dissipation (Note 5)
400 mW
V
+
to GND
0V to +15V
V
-
to GND
0V to -15V
Input Voltage Referred to GND
25V
Strobe to GND
-0.5V to +5.5V
Applied Output Voltage
-0.5V to +15V
Operating Conditions
Min
Max
Units
Supply Voltage (V
CC
)
4.5
5.5
V
Temperature (T
A
)
-55
+125
C
Electrical Characteristics
(Notes 2, 3)
Hysteresis, -IN A, -IN B, RA and RB Open for MIL-STD-188C, unless otherwise specified
Symbol
Characteristics
Conditions
Min
Max
Units
V
OL
Output Voltage LOW
V
+
= 10.8V, V
-
= -13.2V,
0.4
V
V
I
+
= 0.6V, I
OL
= 6.4 mA
V
OH
Output Voltage HIGH
V
+
= 10.8V, V
-
= -13.2V,
2.4
V
V
I
+
= 0.6V, I
OH
= -0.5 mA
I
OS
Output Short Circuit
V+ = 13.2V, V
-
= -10.8V,
-3.0
mA
Current (Note 4)
V
I+
= 0.6V, V
O
= 0V
I
IH
(ST)
Input Current HIGH
V
+
= 10.8V,
V
ST
= 2.4V
40
A
(Strobe)
V
-
= -13.2V, V
I
+
= 0.6V
V
ST
= 5.5V
1.0
mA
R
I
Input Resistance
V
+
= 13.2V, V
-
= -13.2V,
6.0
k
-3.0V
V
I
+
3.0V
I
TH+
Positive Threshold Current
10.8V
V
CC
13.2V,
100
A
V
O
= 2.4V
I
TH
-
Negative Threshold Current
10.8V
V
CC
13.2V,
-100
A
V
O
= 0.4V
V
IL
(ST)
Input Voltage LOW (Strobe)
V
I
+
= -0.6V
0.8
V
V
IH
(ST)
Input Voltage HIGH (Strobe)
V
+
= 13.2V, V
-
= -10.8V,
2.0
V
V
I
+
= -0.6V
I
+
Positive Supply Current
10.8V
V
CC
13.2V
18
mA
V
I
+
= -0.6V
I
-
Negative Supply Current
10.8V
V
CC
13.2V
-16
mA
V
I
+
= 0.6V
Electrical Characteristics
+IN A and -IN B connected to ground, RA and RB connected to -IN A and -IN B and Hysteresis connected to V
-
for
RS-232C, unless otherwise specified
Symbol
Characteristics
Conditions
Min
Max
Units
R
I
Input Resistance
3.0V
V
I
25V
3.0
7.0
k
-3.0V
V
I
-25V
3.0
7.0
k
V
I
Input Voltage
-2.0
2.0
V
V
TH+
Positive Threshold Voltage
3.0
V
V
TH-
Negative Threshold Voltage
-3.0
V
Note 1: "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 2: Unless otherwise specified Min/Max limits apply across the -55C to +125C temperature range.
Note 3: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified.
Note 4: Only one output at a time should be shorted.
Note 5: Rating applies to ambient temperatures up to +125C. Above 125C ambient, derate linearity at 120C/W.
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2
Electrical Characteristics
V
CC
=
12V for MIL-STD-188C and RS-232C, T
A
= 25C
Symbol
Characteristics
Conditions
Min
Max
Units
t
PLH
Propagation Delay to High Level
See
Figure 1
250
ns
t
PHL
Propagation Delay to Low Level
See
Figure 1
250
ns
DS009761-2
15 pF includes jig capacitance. All diodes are FD777 or equivalent.
DS009761-3
PRR = 10 kHz
PW = 50 s
t
r
= t
f
= 5 ns
FIGURE 1. Switching Time Test Circuit and Waveforms
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3
Equivalent Circuit
(
1
/
2
of Circuit)
DS009761-4
www.national.com
4
Physical Dimensions
inches (millimeters) unless otherwise noted
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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
Ceramic Dual-In-Line Package
Order Number DS9627MJ/883
NS Package Number J16A
DS9627
Dual
Line
Receiver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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