UC5180C
Octal Line Receiver
FEATURES
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Meets EIA 232E/423A/422A and CCITT
V.10,V.11, V.28, X.26, X.27
Single +5V Supply--TTL Compatible
Outputs
Differential Inputs Withstand
±
25V
Low Open Circuit Voltage for Improved
Failsafe Characteristic
Reduced Supply Current--35 mA Max
Input Noise Filter
Internal Hysteresis
DESCRIPTION
The UC5180C is an octal line receiver designed to meet a wide range
of digital communications requirements as outlined in EIA standards
EIA232E, EIA423A, EIA422A, and CCITT V.10, V.11, V.28, X.26, and
X.27. The UC5180C includes an input noise filter and is intended for
applications employing data rates up to 200 KBPS. A failsafe function
allows these devices to "fail" to a known state under a wide variety of
fault conditions at the inputs.
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Output Sink Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
Output Short Circuit Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Sec
Common Mode Input Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Differential Input Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V
Failsafe Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to V
CC
PLCC Power Dissipation, T
A
= 25°C (Note 2). . . . . . . . . . . . . . . . . . . 1000 mW
DIP Power Dissipation, T
A
= 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . 1200 mW
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . . . . . . . . . -300°C
Note 1: All voltages are with respect to ground, pin 14. Currents are positive
into, negative out of the specified terminal
Note 2: Consult Packaging Section of Databook for thermal limitations and
considerations of package.
CONNECTION DIAGRAMS
DIL-28 (TOP VIEW)
PLCC-28 (TOP VIEW)
1/94
UC5180C
DC ELECTRICAL CHARACTERISTICS:
Unless otherwise stated these specifications apply for T
A
= 0°C to +70°C, V
CC
= 5V
±
5%, Input Common Mode Range
±
7V, T
A
=T
J
TEST CONDITIONS
3V
≤ |
V
IN
| ≤
25V
Inputs Open or Shorted
Together, or One Input
Open and One Grounded
PARAMETERS
DC Input Resistance
Failsafe Output Voltage
SYMBOL
R
IN
V
OFS
UC5180C
MIN
MAX
3
7
0.45
2.7
50
-200
-400
50
200
400
-50
140
75
20
UNITS
kΩ
V
Differential Input High
Threshold
Differential Input Low
Threshold
Hysteresis
Open Circuit Input Voltage
Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Short Circuit Output
Current
Supply Current
Input Current
V
TH
V
TL
V
H
V
ICC
C
I
V
CH
V
OL
I
OS
I
CC
I
IN
0
≤
I
OUT
≤
8mA, V
FAILSAFE
= 0V
0
≥
I
OUT
≥
- 400
µA,
V
FAILSAFE
= V
CC
V
OUT
= 2.7V, I
OUT
= 440
µA
R
S
= 0 (Note 2)
(See Figure 1)
R
S
= 500 (Note 2)
V
OUT
= 0.45V, I
OUT
= 440 mA
R
S
= 0 (Note 2)
(See Figure 1)
R
S
= 500 (Note 2)
F
S
= 0V or V
CC
(See Figure 1)
mV
mV
mV
mV
pF
V
V
mA
mA
mA
V
ID
= 1V, I
OUT
= - 440µA
V
ID
= -1V
(Note 3)
Note 4
4.75V
≤
V
CC
≤
5.25V
Other Inputs Grounded
2.7
I
OUT
= 4 mA
I
OUT
= 8 mA
20
0.4
0.45
100
35
3.25
-3.25
V
IN
= +10V
V
IN
= -10V
Note 2: R
S
is a resistor in series with each input.
Note 3: Measured after 100ms warm up (at 0°C)
Note 4: Only 1 output may be shorted at one time
and then only for a maximum of 1 sec.
Figure 1.
V
tL
, V
tH
, V
H
Definition
AC ELECTRICAL CHARACTERISTICS:
V
CC
= 5V
±
5%, T
A
= 0°C to + 70°C, Figure 2, T
A
= T
J.
PARAMETERS
Propagation Delay - Low to High
Propagation Delay - High to Low
Acceptance Input Frequency
Rejectable Input Frequency
SYMBOL
t
PLH
t
PHL
f
A
f
R
TEST CONDITIONS
C
L
= 50pF, V
IN
=
±
500mV
C
L
= 50pF, V
IN
=
±
500mV
Unused Input Grounded, V
IN
=
±
200mV
Unused Input Grounded, V
IN
=
±
500mV
UC5180C
MIN
MAX
550
550
0.1
5.5
UNITS
ns
ns
MHz
MHz
2
UC5180C
Figure 2.
AC Test Circuit
APPLICATIONS INFORMATION
Failsafe Operation
These devices provide a failsafe operating mode to
guard against input fault conditions as defined in
EIA422A and EIA423A standards. These fault condi-
tions are (1) drive in power-off condition, (2) receiver not
interconnected with driver, (3) open-circuited intercon-
necting cable, and (4) short-circuited interconnecting
cable. If one of these four fault conditions occurs at the
inputs of a receiver, then the output of that receiver is
driven to a known logic level. The receiver is pro-
grammed by connecting the failsafe input to V
CC
or
ground. A connection to V
CC
provides a logic "1" output
EIA232E/V.28 / EIA423A/V.10 DATA TRANSMISSION
under fault conditions, while a connection to ground
provides a logic "0". There are two failsafe pins (F
S1
and F
S2
) on the UC5180C where each provides com-
mon failsafe control for four receivers.
Input Filtering (UC5180C)
The UC5180C has input filtering for additional noise re-
jection. This filtering is a function of both signal level
and frequency. For the specified input (5.5 MHz at
±500
mV) the input stage filter attenuates the signal such that
the output stage threshold levels are not exceeded and
no change of state occurs at the output.
EIA422A/V.11 DATA TRANSMISSION
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
•
MERRIMACK, NH 03054
TEL. (603) 424-2410
•
FAX (603) 424-3410
3
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Copyright
©
1999, Texas Instruments Incorporated
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