Octal Line Driver
INPUTS
OUTPUTS
EN
DATA
EIA-232E(3)
EIA-232E/EIA-423A
0
0
(V+)-3V
5V to 6V
0
1
(V-)+3V
-5V to -6V
1
X
High Z
High Z
Note 3: Minimum output swings.
CONNECTION DIAGRAMS
N PACKAGE (TOP VIEW)
Q PACKAGE (TOP VIEW)
V+ (Pin 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
V- (Pin 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15V
PLCC Power Dissipation, T
A
= 25
C (Note 2) . . . . . . . . . . . . . . . . . . 1000 mW
DIP Power Dissipation, T
A
= 25
C (Note 2) . . . . . . . . . . . . . . . . . . . . 1250 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.5V to +7V
Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12V to +12V
Slew Rate Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2k to 10k
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65
C to +150
C
Note 1: All voltages are with respect to ground, pin 18.
Note 2: Consult Packaging section of Databook for thermal limitations and
considerations of package.
UC5171
The UC5171 is a single-ended octal line driver designed to meet both
standard modem control applications (EIA232E/V.28), and long line
drive applications (EIA423A/V.10/X.26). The slew rate for all 8 drivers
is controlled by a single external resistor. The slew rate and output lev-
els in Low Mode are independent of the power variations.
Mode selection is accomplished by the select pin Ms logic "low" for low
output mode (EIA232E/V.28 & EIA423A/V.10) or pin Ms logic "high" for
high mode (EIA232E/V.28). High mode should only be used to drive
adapters that take power from the control lines, or applications using
high threshold receivers.
Eight Single-Ended Line Drivers in One
Package
Digital Selection of High Mode
EIA232E/CCITT V.28 only, and Low
Mode EIA232E/V.28 & EIA423A/CCITT
V.10/X.26
Single External Resistor Controls Slew
Rate
Wide Supply Voltage Range
Tri-State Outputs
Output Short-Circuit Protection
Low Power Consumption
2kV ESD Protection on all Pins
FEATURES
ABSOLUTE MAXIMUM RATINGS (Note 1)
FUNCTIONAL TABLE
7/95
DESCRIPTION
UC5171
AC ELECTRICAL CHARACTERISTICS:
DC ELECTRICAL CHARACTERISTICS:
PARAMETERS
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY REQUIREMENTS
V+ Range
9
15
V
V- Range
-15
-9
V
V+ Supply Current
I+
R
L
= Infinite En = 0V
25
42
mA
V- Supply Current
I-
R
L
= Infinite En = 0V
-42
-23
mA
INPUTS
High Level Input Voltage
V
IH
2.0
V
Low Level Input Voltage
V
IL
0.8
V
Input Clamp Voltage
V
IK
I
I
= -15 mA
-1.8
-1.1
V
High Level Input Current
I
IH
V
IH
= 2.4V
0.25
40
A
Low Level Input Current
I
IL
V
IL
= 0.4V
-200
-8.0
A
OUTPUTS
High Level
V
OH
V
IN
= 0.8V
R
L
= Inf.
5.0
5.3
6.0
V
Output Voltage EIA232E
En = 0.8V
R
L
= 3k
5.0
5.3
6.0
V
(EIA423A)
R
L
= 450
4.5
5.2
6.0
V
Low Level
V
OL
V
IN
= 2.0V
R
L
= Inf.
-6.0
-5.3
-5.0
V
Output Voltage EIA232E
En = 0.8V
R
L
= 3k
-6.0
-5.3
-5.0
V
(EIA423A)
R
L
= 450
-6.0
-5.2
-4.5
V
Output Balance (EIA423A)
V
BAL
R
L
= 450
V
OH
+ V
OL
= V
BAL
0.2
0.4
V
High Level
V
OH
V
IN
= 0.8V, M
S
= 2.0V
R
L
= Inf.
7.0
7.6
10
V
Output Voltage (EIA232E)
En = 0.8V
R
L
= 3k
7.0
7.6
10
V
Low Level Output Voltage
V
OL
V
IN
= 2.0V, M
S
= 2.0V
R
L
= Inf.
-10
-7.7
-7.0
V
(EIA232E)
En = 0.8V
R
L
= 3k
-10
-7.7
-7.0
V
Off-State Output Current
I
OZ
En = 2.0V, V
O
=
6V, M
S
= 2.0V
-100
100
A
Short-Circuit Current
I
OS
En = 0V
V
IN
= 0V
25
50
mA
V
IN
= 5V
25
40
mA
PARAMETERS
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Output Slew Rate
t
R
R
SRA
= 2k
6.65
9.5
12.3
V/
s
t
F
R
L
= 450, C
L
= 50pF
6.65
10
12.3
V/
s
Output Slew Rate
t
R
R
SRA
= 10k
1.33
1.9
2.45
V/
s
t
F
R
L
= 450, C
L
= 50pF
1.33
2.2
2.45
V/
s
Propagation Output to
t
Hz
R
SRA
= 10k
0.3
1.0
s
High Impedance
t
Lz
R
L
= 450, C
L
= 50pF
0.5
1.0
s
Propagation High Impedance to
t
zH
R
SRA
= 10k
6.0
15
s
Output
t
zL
R
L
= 450, C
L
= 50pF
7.0
15
s
Unless otherwise stated these specifications hold for
|
V+
|
=
|
V
-
|
= +10V,
0 < T
A
< +70C, M
S
0.8V, R
SRA
= +10k, T
A
=T
J
.
at
|
V+
|
=
|
V
-
|
= +10V, 0 < T
A
< +70C, M
S
0.8V, T
A
=T
J
.
2
AC PARAMETER TEST CIRCUIT AND WAVEFORMS
UC5171
Slew Rate Programming
Slew rate for the UC5171 is set up by a single external re-
sistor connected between the SRA pin and ground. Slew
rate adjustments can be approximated by using the fol-
lowing formula:
V
/
s
=
20
R
SRA
(
R
SRA
in k
)
The slew rate resistor can vary between 2k and 10k
which allows slew rates between 10 to 2.2V/
s, respec-
tively. The relationship between slew rate and R
SRA
is
shown in the typical characteristics.
Waveshaping of the output lets the user control the level
of interference (near-end crosstalk) that may be coupled
to adjacent circuits in an interconnection. The recom-
mended output characteristics for cable length and data
rates can be found in EIA standard EIA-423A. Approxima-
tions of these standards are given by the following equa-
tions:
Max. Data Rate=300/t (For data rates 1k to 100k bit/s)
Max. Cable Length (feet)=100 x t (Max. length 4000
feet)
where t is the transition time from 10% to 90% of the out-
put swing in microseconds. For data rates below 1k bit/s,
t may be up to 300 microseconds.
Output Voltage Programming
The UC5171 has two programmable output modes, either
a low voltage mode which meets EIA-423A operational
specifications, or the high output voltage mode which
meets the EIA-232E specifications.
The high output mode provides greater output swings,
minimum of 3V below the supply rails, for driving higher,
attenuated lines. This mode is selected by connecting the
modes select pin, (M
S
), to a TTL "high" level. The low out-
put mode provides a controlled output swing and is ac-
complished by connecting the mode select pin, (M
S
), to a
TTL "low level."
EIA Standards
The UC5171 meets or exceeds the EIA Standards for
EIA-232E and EIA-423A modes of operation except under
power down conditions. When powered down with the
output attached to an active buss, the UC5171 has the
potential to load the bus under transient conditions.
AC CHARACTERISTICS
Driver Slew Rate
Driver t
R
& t
F
(10-90%) EIA-423A Mode
APPLICATIONS INFORMATION
3
UC5171 Specific Layout Notes
The UC5171 layout must have bulk bypassing close to
the device. Peak slew current is greater than 500mA
when all eight drivers slew at once in the same direction.
Some applications mount the UC5171 on a bulkhead or
isolated plane for RFI/FCC/VDE reasons. If bulk bypass-
ing is not used, the -10V supply may go above -8.5 volts,
causing the slew rate control circuit to become unstable.
The UC5171 can have output oscillation at 100kHz if the
+10V supply is applied before the -10V supply. This has
been a problem in some terminal designs where the +10V
was developed from the flyback, which can result in a
500ms difference in the application of the supplies at
power up.
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.
UC5171
Filter connectors or transzorbs should be used to reduce
the RFI/EMI, protecting the system from static (ESD), and
electrical overstress (EOS). A filter connector or capacitor
will reduce the ESD pulse by 90% typically. A cable
dragged across a carpet and connected to a system can
easily be charged to over 25,000 volts. This is a metal-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 capaci-
tor, and the device clamps the ESD and EOS pulses
which would pass through the capacitor and destroy the
devices. The recommended transzorb for the UC5171 is
P6KEIOCA
*Transzorb is a trademark of General Semiconductor
Industries.
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX 603) 424-3460
APPLICATIONS
4
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Copyright
1999, Texas Instruments Incorporated
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