UC5181C Octal Line Receiver FEATURES DESCRIPTION • 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 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. • Reduced Supply Current—35mA Max • Internal Hysteresis ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 VCC PLCC Power Dissipation, TA=25° C (Note 2) . . . . . . . . . . . . . . . . . . . 1000 mW DIP Power Dissipation, TA=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 DIL-28 (TOP VIEW) SLUS261 - JANUARY 1994 PLCC-28 (TOP VIEW) UC5181C DC ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0°C to +70°C; VCC = 5V ±5%, Input Common Mode Range ±7V, TA=TJ. PARAMETER SYMBOL DC Input Resistance Failsafe Output Voltage RIN VOFS Differential Input High Threshold VTL Differential Input Low Threshold VTL Hysteresis Open Circuit Input Voltage Input Capacitance High Level Output Voltage Low Level Output Voltage VH VIOC CI VOH VOL Short Circuit Output Current Supply current Input Current TEST CONDITIONS 3V ≤ |VIN|≤25V Inputs Open or Shorted Together, or One Input Open and One Grounded 0≥IOUT≤8mAVFAILSAFE=0V 0≥IOUT≥-400µA, VFAILSAFE=VCC VOUT= 0.45V, IOUT = -440µA (See Figure RS = 0 (Note3) 1) RS = 500 (Note 3) VOUT = 0.45V, IOUT = 8 mA (See Figure RS = 0 (Note 3) 1) RS = 500 (Note 3) FS=0V or VCC (See Figure 1) UC5181C MIN MAX 3 7 0.45 2.7 50 -200 -400 45 VID = 1V, IOUT = -440 µA IOS Note 5 ICC IIN 4.75V ≤VCC≤5.25V 20 Other Inputs Grounded VIN = +10V VIH = -10V kΩ V 200 400 -50 mV 140 75 20 mV mV pF V V 2.7 IOUT = 4 mA IOUT = 8 mA VID = -1V (Note 4) UNITS 0.4 0.45 100 35 3.25 mV mA mA mA -3.25 Note 3: RS 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 tPLH or tPHL, shall not vary from receiver to receiver by more than 35ns. Figure 1. VTL, VTH,VH Definition AC ELECTRICAL CHARACTERISTICS: VCC=5V ±5%. TA=0°C to +70°C, Figure 2 TA=TJ. PARAMETER Propagation Delay–Low to High Propagation Delay–High to Low Acceptable Input frequency SYMBOL tPLH tPHL fA TEST CONDITIONS CL=50pF, VIN= ±500 mV (Note 6) CL=50pF, VIN= ±500 mV (Note 6) Unused Input Grounded, VIN= ±200 mV Figure 2. AC Test Circuit 2 UC5181C UNITS MIN MAX 120 ns 120 ns 5.0 MHz UC5181C APPLICATIONS INFORMATION then the output of that receiver is driven to a known logic level. The receiver is programmed by connecting the failsafe input to VCC or ground. A connection to VCC provides a logic “1" output under fault conditions, while a connection to ground provides a logic ”0". There are two failsafe pins (FS1 and FS2) on the UC5181C where each provides common failsafe control for four receivers. 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, EIA232E/V.28 / EIA423A/V.10 DATA TRANSMISSION EIA423A/V.10 EIA422A/V.11 DATA TRANSMISSION GENERAL LAYOUT NOTES 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 UC5180C and the UC5181C is P6KE22CA. 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 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 * Transzorb is a trademark of General Semiconductor Industries. UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. 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