Datasheet UC5171QTR, UC5171Q, UC5171N Datasheet (Texas Instruments)

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 .
N PACKAGE (TOP VIEW)
Q PACKAGE (TOP VIEW)
V+ (Pin 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
V- (Pin 11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15V
PLCC Power Dissipation , TA = 25°C ( Not e 2) . . . . . . . . . . . . . . . . . . 1000 mW
DIP Power Dissipat ion, TA = 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 respec t to ground, pin 18. Note 2: Consult Packaging section of Data book for thermal limitat ions and
consideration s of packa ge.
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 applicati ons (EIA423A/V.10/X.26). The slew rate for all 8 drivers is controlled by a single external resistor. The slew rat e and output lev ­els in Low Mode are independent of t he 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 Prot ect ion
Low Power Consumption
2kV ESD Protection on all Pins
FEATURES
ABSOLUTE MAXI MUM RATING S (Not e 1)
FUNCTIONAL TABLE
7/95
DESCRIPTION
UC5171
AC ELECTRICAL CHARACTERIST ICS :
DC ELECTRICAL CHARACTERIST ICS :
PARAMETERS SYMBO L TEST CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY REQUIREMENTS
V+ Range 915V 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 Volta ge V
IK II = -15 mA -1.8 -1.1 V
High Level Input Current I
IH VIH = 2.4V 0.25 40 µA
Low Level Input Current I
IL VIL
= 0.4V -200 -8.0 µA
OUTPUTS
High Level V
OH VIN = 0.8V RL = Inf. 5. 0 5.3 6. 0 V
Output Voltage EIA232E
En = 0.8V RL = 3k 5.0 5.3 6.0 V (EIA42 3A ) RL = 450 4.5 5.2 6.0 V Low Level V
OL VIN = 2.0V RL = Inf. -6.0 -5.3 -5.0 V
Output Voltage EIA232E
En = 0.8V RL = 3k -6.0 -5.3 -5.0 V (EIA423A) R
L = 450 -6.0 -5.2 -4.5 V
Output Balance (EIA423A) V
BAL RL = 450 VOH + V OL = VBAL 0.2 0.4 V
High Level V
OH VIN = 0.8V, MS = 2.0V RL = Inf. 7.0 7.6 10 V
Output Voltage ( EIA232E)
En = 0.8V RL = 3k 7.0 7.6 10 V Low Level Output Volta ge V
OL VIN = 2.0V, MS = 2.0 V RL = Inf. -10 -7.7 -7. 0 V
(EIA232E) En = 0.8V RL = 3k -1 0 -7.7 -7. 0 V Off-Stat e O utput Current I
OZ En = 2.0V, VO =
±±
6V, MS = 2.0V -100 100 µA
Short-Circuit Cur re nt I
OS En = 0V VIN = 0V 25 50 mA
V
IN = 5V 25 40 mA
PARAMETERS SYMBO L TEST CONDITIONS MIN TYP MAX UNITS
Output Slew Rate t
R RSRA = 2k 6.65 9 .5 12.3 V/µs
t
F RL = 450, CL = 50pF 6.65 10 12.3 V/µs
Output Slew Rate t
R RSRA = 10k 1.33 1 .9 2.45 V/µs
t
F RL = 450, CL = 50pF 1.33 2.2 2.45 V/µs
Propagation Output to t
Hz RSRA = 10k 0.3 1.0 µs
High Impedance t
Lz RL = 450, CL = 50pF 0.5 1.0 µs
Propagation High Impedance to t
zH RSRA = 10k 6.0 15 µs
Output t
zL RL = 450, CL = 50pF 7.0 15 µs
Unless otherwise stated these sp ecif icatio ns hold for | V+ | = | V - | = +10V, 0 < TA < +70°C, MS 0.8V, R SRA = +1 0k, TA =TJ.
at | V+ | = | V - | = +10V, 0 < T A < +70°C, MS ≤ 0.8V, TA =TJ.
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AC PARAMETER TEST CIRCUIT AND WAVEFORMS
UC5171
Slew Rate Programming
Slew rate for the UC5171 is set up by a single ex ternal re­sistor connected between the SRA pin and ground. Slew rate adjustments can be approximated by using the fol­lowing formula:
V
⁄ µs =
20
R
SRA
(
R
SRA
in kΩ )
The slew rate resistor can vary between 2k and 10k which allows slew rates betwe en 10 to 2.2V/µs, respec­tively. The relationship between slew rate and RSRA is shown in the typical characteristics.
Waveshaping of the output l ets the user control the level of interference (near-end crosstalk) that may be coupled to adjacent circuits in an interconnection. The recom­mended output characteristics for cable length and data rates can be found in EIA standard EIA-423A. Approxima­tions of these standards are given by the following equa­tions:
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 out­put swing in microsecon ds. For d ata rates below 1k bit/s, t may be up to 300 microseconds.
Output Voltage Programming
The UC5171 has t wo 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 ac­complished by connecting the mode select pin, (M
S), to a
TTL “low level.” EIA Stan d ards
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 tR & tF (10-90%) EIA-423A Mode
APPLICATIONS INFORMATION
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UC5171 Specific Layout Note s
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 bypass­ing 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 oscilla tion at 100kHz if the +10V supply is a pplied 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 Layou t Note s
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 acro ss a carpet and connected to a system can easily be charged to over 25,000 volts. This is a metal-to­metal 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 capaci tance inherently acts a s a filter capaci­tor, and the device clamps the ESD and EOS pulses which would pass through the cap acitor 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
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