UC5170C Octal Line Driver FEATURES DESCRIPTION • Eight Single Ended Line Drivers in One Package • Meets EIA Standards EIA232E/V.28, EIA423A and CCITT V.10/X.26 The UC5170C 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 eight drivers is controlled by a single external resistor. The slew rate and output levels in Low Mode are independent of the power variations. • Single External Resistor Controls Slew Rate • Wide Supply Voltage Range • Tri-State Outputs • Output Short-Circuit Protection Mode selection is easily accomplished by taking the select pins (MS+ and MS-) to ground for low output mode (EIA232E/V.28 and EIA423A/V.10) or to their respective supplies for high mode (EIA232E/V.28). High mode should only by used to drive adapters that take power from the control lines, or applications using high threshold receivers. ABSOLUTE MAXIMUM RATINGS (Note 1) V+ (Pin 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V V- (Pin 11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −15V PLCC Power Dissipation, TA = 25°C (Note 2) . . . . . . 1000 mW DIP Power Dissipation, TA = 25°C (Note 2) . . . . . . . . 1250 mW Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . −1.5V to +7V Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . −12V to +12V Slew Rate Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . 2k to 10kΩ 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 packages. FUNCTIONAL TABLE INPUTS EN 0 0 1 DATA 0 1 X OUTPUTS HIGH EIA-232E(2) (V+)-3V (V-)-3V High Z Note 2: Minimum output swings. CONNECTION DIAGRAMS N PACKAGE (TOP VIEW) 7/95 Powered by ICminer.com Electronic-Library Service CopyRight 2003 Q PACKAGE (TOP VIEW) LOW EIA423A+EIA232E 5V to 6V −5V to -6V High Z UC5170C DC ELECTRICAL CHARACTERISTICS: Unless otherwise stated these specifications hold for | V+ | = | V - | = 10V, 0 < TA < +70°C, MS+ = MS− = 0V, RSRA = +10k, TA =TJ. PARAMETERS SYMBOL TEST CONDITIONS MIN TYP MAX UNITS POWER SUPPLY REQUIREMENTS V+ Range 9 V- Range 15 -9 V+ Supply Current I+ RL = Infinite En = 0V V- Supply Current I- RL = Infinite En = 0V 25 -23 V -15 V 42 -42 mA mA INPUTS High Level Input Voltage VIH Low Level Input Voltage VIL 2.0 V 0.8 V Input Clamp Voltage VIK II = -15 mA -1.1 -1.8 V High Level Input Current IIH VIH = 2.4V 0.25 40 µA Low Level Input Current IIL VIL = 0.4V VOH VIN = 0.8V En = 0.8V 4.5 VIN = 2.0V RL = Inf. -5.0 En = 0.8V RL = 3k OUTPUTS High Level (Low Mode) Output Voltage (EIA423A/V.10, EIA232E/V.28) -8.0 RL = Inf. 5.0 5.3 6.0 V RL = 3k 5.0 5.3 6.0 V 5.2 6.0 V -5.3 -6.0 V RL = 450 Low Level (Low Mode) Output Voltage VOL (EIA423A/V.10,EIA232E/V.28) µA -200 RL = 450 -5.0 -5.3 -6.0 V -4.5 -5.2 -6.0 V Output Balance (EIA423A/V.10) VBAL RL = 450 VOH - VOL = VBAL 0.2 0.4 V High Level (High Mode) Output Voltage VOH VIN = 0.8V RL = Inf., MS+ = V+, MS- = VEn = 0.8V RL = 3k, MS+ = V+, MS- = V- 7.0 7.0 7.6 7.6 10 10 V V VOL VIN = 2.0V RL = Inf., MS+ = V+, MS- =V- -7.0 -7.7 -10 V En = 0.8V -7.0 -7.7 -10 V (EIA232E/V.28) Low Level (High Mode) Output Voltage (EIA232E, V.28) Off-State Output Current IOZ RL = 3k, MS+ = V+, MS- = VEn = 2.0V, VO = ±6V, V+ = 15V, V- = -15V Short-Circuit Current IOS VIN = 0V, En = 0V 25 50 mA VIN = 5V, En = 0V 25 40 mA AC ELECTRICAL CHARACTERISTICS: PARAMETERS -100 µA at | V+ | = | V - | = 10V, 0 < TA < +70°C, MS+ = MS− = 0V, TA =TJ. SYMBOL TEST CONDITIONS MIN TYP 6.65 9.5 Output Slew Rate tR RSRA = 2k tF RL = 450, CL = 50pF 6.65 Output Slew Rate tR RSRA = 10k 1.33 tF RL = 450, CL = 50pF 1.33 Propagation Output to tHz RSRA = 10k High Impedance tLz Propagation High Impedance to tzH Output tzL Powered by ICminer.com Electronic-Library Service CopyRight 2003 100 MAX UNITS 12.3 V/µs 10 12.3 V/µs 1.9 2.45 V/µs 2.2 2.45 V/µs 0.3 1.0 µs RL = 450, CL = 50pF 0.5 1.0 µs RSRA = 10k 6.0 15 µs RL = 450, CL = 50pF 7.0 15 µs 2 UC5170C AC PARAMETER TEST CIRCUIT AND WAVEFORMS AC CHARACTERISTICS Low Output Driver tR & tF (10-90%) EIA232E + EIA423A Mode Driver Slew Rate APPLICATION INFORMATION Slew Rate Programming Max. Data Rate = 300/t (For data rates 1k to 100k bit/s) Slew rate for the UC5170C is set up by a single external resistor connected between the SRA pin and ground. Slew rate adjustments can be approximated by using the following formula: Max. Cable Length (feet) = 100 x t (Max. length 4000 feet) V ⁄ µs = where t is the transition time from 10% to 90% of the output swing in microseconds. For data rates below 1k bit/s t may be up to 300 microseconds. 20 (RSRA in k Ω) RSRA Output Voltage Programming The UC5170C has two programmable output modes, either a low voltage mode which meets EIA423A, EIA232E/V.28/V.10 specifications, or the high output mode which meets the EIA232E, V.28 specifications. The slew rate resistor can vary between 2k and 10k which allows slew rates between 10 to 2.2V/µs, respectively. The relationship between slew rate and RSRA is shown in the typical characteristics. The high output mode provides greater output swings, minimum of 3V below and supply rails for driving higher, attenuated lines. This mode is selected by connecting the mode select pins to their respected supplies, MS+ to V+ and MS- to V-. 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 recommended output characteristics for cable length and data rates can be found in EIA standard EIA423A +V.10. Approximations of these standards are given by the following equations: Powered by ICminer.com Electronic-Library Service CopyRight 2003 The low output mode provides a controlled output swing and is accomplished by connecting both mode select pins to ground. 3 UC5170C APPLICATIONS 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 25,00 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 capacitor, and the device clamps the ESD and EOS pulses which would pass through the capacitor and destroy the devices. The recommended transzorb for the UC5170C is P6KEIOCA. SPECIFIC LAYOUT NOTES The UC5170C 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 UC5170C 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 UC5170C 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. *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 Powered by ICminer.com Electronic-Library Service CopyRight 2003 4 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 Powered by ICminer.com Electronic-Library Service CopyRight 2003