Octal Line Receiver
FEATURES
Meets EIA232E/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--35mA Max
Internal Hysteresis
DESCRIPTION
The UC5181C is an octal line receiver designed to meet a wide range
of digital communications requirements as outlined in EIA standards
EIA232E, EIA422A, EIA423A and CCITT V.10, V.11, V.28, X.26, and
X.27. The UC5181C is similar to the UC5180C, but without the input
filtering. Thus, it covers the entire range of data rates up to 10MBPS. 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
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 in,
negative out of the specified terminal.
Note 2: Consult packaging section of Databook for thermal limitations and
considerations of package.
CONNECTION DIAGRAMS
UC5181C
DIL-28 (TOP VIEW)
PLCC-28 (TOP VIEW)
1/94
DC ELECTRICAL CHARACTERISTICS
:
PARAMETER
SYMBOL
TEST CONDITIONS
UC5181C
UNITS
MIN
MAX
DC Input Resistance
R
IN
3V
|V
IN
|
25V
3
7
k
Failsafe Output Voltage
V
OFS
Inputs Open or Shorted
Together, or One Input Open
and One Grounded
0
I
OUT
8mAV
FAILSAFE
=0V
0.45
V
0
I
OUT
-400
A, V
FAILSAFE
=V
CC
2.7
Differential Input High
Threshold
V
TL
V
OUT
= 0.45V, I
OUT
= -440
A (See Figure
1)
R
S
= 0 (Note3)
50
200
mV
R
S
= 500 (Note 3)
400
Differential Input Low
Threshold
V
TL
V
OUT
= 0.45V, I
OUT
= 8 mA (See Figure
1)
R
S
= 0 (Note 3)
-200
-50
mV
R
S
= 500 (Note 3)
-400
Hysteresis
V
H
F
S
=0V or V
CC
(See Figure 1)
45
140
mV
Open Circuit Input Voltage
V
IOC
75
mV
Input Capacitance
C
I
20
pF
High Level Output Voltage
V
OH
V
ID
= 1V, I
OUT
= -440
A
2.7
V
Low Level Output Voltage
V
OL
V
ID
= -1V (Note 4)
I
OUT
= 4 mA
0.4
V
I
OUT
= 8 mA
0.45
Short Circuit Output
Current
I
OS
Note 5
20
100
mA
Supply current
I
CC
4.75V
V
CC
5.25V
35
mA
Input Current
I
IN
Other Inputs Grounded
V
IN
= +10V
3.25
mA
V
IH
= -10V
-3.25
PARAMETER
SYMBOL
TEST CONDITIONS
UC5181C
UNITS
MIN
MAX
Propagation DelayLow to High
t
PLH
C
L
=50pF, V
IN
=
500 mV (Note 6)
120
ns
Propagation DelayHigh to Low
t
PHL
C
L
=50pF, V
IN
=
500 mV (Note 6)
120
ns
Acceptable Input frequency
f
A
Unused Input Grounded, V
IN
=
200 mV
5.0
MHz
Note 3: R
S
is a resistor in series with each input.
Note 4: Measure after 100 ms warm up (at 0
C).
Note 5: Only 1 output may be shorted at a time and then only for a
maximum of 1 sec.
Note 6: The delays, either t
PLH
or t
PHL
, shall not vary from receiver to
receiver by more than 35ns.
Figure 2.
AC Test Circuit
AC ELECTRICAL CHARACTERISTICS:
Figure 1.
V
TL
, V
TH
,V
H
Definition
UC5181C
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.
V
CC
=5V
5%. T
A
=0
C to +70
C, Figure 2 T
A
=T
J.
2
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 conditions are (1) driver
in power-off condition, (2) receiver not interconnected
with driver, (3) open-circuited interconnecting 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 programmed by connecting the fail-
safe input to V
CC
or ground. A connection to V
CC
provides
a logic "1" output under fault conditions, while a connec-
tion to ground provides a logic "0". There are two failsafe
pins (F
S1
and F
S2
) on the UC5181C where each provides
common failsafe control for four receivers.
EIA232E/V.28 / EIA423A/V.10 DATA TRANSMISSION
EIA422A/V.11 DATA TRANSMISSION
UC5181C
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX (603) 424-3460
GENERAL LAYOUT NOTES
The drivers and receivers should be mounted close to the
system common ground point, with the ground reference
tied to the common point to reduce RFI/EMI.
Filter connectors or transzorbs should be used to reduce
the RFI/EMI, and protecting the system from static (ESD),
and electrical overstress (EOS). A filter connector or ca-
pacitor will reduce the ESD pulse by 90% typically. A ca-
ble dragged across a carpet and connected to a system
can easily be charged to over 25,000 volts. This is a met-
al to metal contact when the cable is connected to the
system (no resistance), currents exceed 80 amps with
less than a nanosecond rise time. A transzorb provides
two functions, the device capacitance inherently acts as a
filter capacitor, and the device clamps the ESD and EOS
pulses which would pass through the capacitor and de-
stroy the devices. The recommended transzorb for the
UC5180C and the UC5181C is P6KE22CA.
* Transzorb is a trademark of General Semiconductor
Industries.
EIA423A/V.10
3
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL
APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER'S RISK.
In order to minimize risks associated with the customer's applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI's publication of information regarding any third
party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright
1999, Texas Instruments Incorporated
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL
APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER'S RISK.
In order to minimize risks associated with the customer's applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI's publication of information regarding any third
party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright
2000, Texas Instruments Incorporated
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