N8T14, SN55122, SN75122 TRIPLE LINE RECEIVERS SLLS075B – D1334, SEPTEMBER 1973 – REVISED FEBRUARY 1993 • • • • • • • • • • Designed for Digital Data Transmission Over Coaxial Cable, Strip Line, or Twisted Pair SN55122 . . . J PACKAGE N8T14, SN75122 . . . D OR N PACKAGE (TOP VIEW) Designed for Operation With 50-Ω to 500-Ω Transmission Lines 1A 1B 2R 2S 2A 2B 2Y GND TTL Compatible Single 5-V Supply Built-Input Threshold Hysteresis High-Speed . . . Typical Propagation Delay Time = 20 ns Independent Channel Strobes 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 1S 1R 1Y 3A 3S 3R 3Y SN55122 . . . FK PACKAGE Input Gating Increases Application Flexibility (TOP VIEW) 1B 1A NC VCC 1S • Fanout to 10 Series 54/74 Standard Loads Can Be Used With Dual Line Drivers SN55121 and SN75121 Interchangeable With Signetics N8T14 2R 2S NC 2A 2B The N8T14, SN55122, and SN75122 are triple line receivers that are designed for digital data transmission over lines having impedances from 50 Ω to 500 Ω. They are also compatible with standard TTL-logic and supply voltage levels. 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 1R 1Y NC 3A 3S 2Y GND NC 3Y 3R description 4 NC – No internal connection THE N8T14 AND SN75122 ARE NOT RECOMMENDED FOR NEW DESIGN The N8T14, SN55122, and SN75122 have receiver inputs with built-in hysteresis to provide increased noise margin for single-ended systems. The high impedance of this input presents a minimum load to the driver and allows termination of the transmission line in its characteristic impedance to minimize line reflection. An open line will affect the receiver input as would a low-level voltage. The receiver can withstand a level of – 0.15 V with power on or off. The other inputs are in TTL configuration. The S input must be high to enable the receiver input. Two of the line receivers have A and B inputs that, if both are high, will hold the output low. The third receiver has only an A input that, if high, will hold the output low. The SN55122 is characterized for operation over the full military temperature range of – 55°C to 125°C. The N8T14 and SN75122 are characterized for operation from 0°C to 70°C. Copyright 1993, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–1 N8T14, SN55122, SN75122 TRIPLE LINE RECEIVERS SLLS075B – D1334, SEPTEMBER 1973 – REVISED FEBRUARY 1993 logic symbol† 1R 1S 1A 1B 2R 2S 2A 2B 3R 3S 3A logic diagram 14 & ≥1 15 1 14 1R 13 1S 1Y & 2 3 2R 4 7 5 4 2S 2Y 7 5 6 2B & ≥1 9 10 3R 3Y 3S 12 3A † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages. 11 9 12 FUNCTION TABLE OUTPUT A INPUTS B‡ R S H H X X L X X L H L L X H X H L X X L H X L H X H X L X L H Y ‡ B input and last two lines of the function table are applicable to receivers 1 and 2 only. H = high level, L = low level, X = irrelevant 2–2 2Y 2A 6 11 1Y 1B 3 10 13 1 1A 2 15 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3Y N8T14, SN55122, SN75122 TRIPLE LINE RECEIVERS SLLS075B – D1334, SEPTEMBER 1973 – REVISED FEBRUARY 1993 schematic diagram (each receiver) VCC To Other Receiver 800 Ω 4 kΩ V 58 Ω R 13, 7, 9 Y V S 4 kΩ V GND A B† To Other Receivers V . . . VCC bus † B input is provided on receivers 1 and 2 only. Resistor values shown are nominal. absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V Input voltage: R input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V A, B, or S input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V Output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 100 mA Continuous total power dissipation (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range: SN55122 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C N8T14, SN75122 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C Case temperature for 60 seconds: FK package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . . . . . . . . . . . . . . . 300°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package . . . . . . . . . . . . . . . . 260°C NOTES: 1. Voltage values are with respect to network ground terminal. 2. The SN55122 chips are alloy mounted, and the SN75122 chips are glass mounted. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING TA = 125°C POWER RATING D 950 mW 7.6 mW/°C 608 mW – FK 1375 mW 11.0 mW/°C 880 mW 275 mW J 1375 mW 11.0 mW/°C 880 mW 275 mW N 1150 mW 9.2 mW/°C 736 mW – POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–3 N8T14, SN55122, SN75122 TRIPLE LINE RECEIVERS SLLS075B – D1334, SEPTEMBER 1973 – REVISED FEBRUARY 1993 recommended operating conditions Supply voltage, VCC High-level input voltage, VIH A, B, R, or S Low-level input voltage, VIL A, B, R, or S MIN NOM MAX UNIT 4.75 5 5.25 V 2 V 0.8 High-level output current, IOH Low-level output current, IOL Operating free-air free air temperature, temperature TA V – 500 µA 16 mA SN55122 – 55 125 SN75122 0 70 °C electrical characteristics over recommended operating free-air temperature, VCC = 4.75 V to 5.25 V (unless otherwise noted) PARAMETER TEST CONDITIONS Vhys VIK Hysteresis (VT+ – VT–) R Input clamp voltage A, B, or S VI(BR) Input breakdown voltage A, B, or S VCC = 5 V, VCC = 5 V, TA = 25°C, II = –12 mA VCC = 5 V, VIH = 2 V, II = 10 mA VIL = 0.8 V, See Figures 2 and 4 VOL Low-level output voltage VIH = 2 V, VI(A) = 0, VI(R) = 1.45 V, IIH High level input current High-level IIL IOS‡ Low-level input current A, B, or S R A, B, or S Short-circuit output current VI(B) = 0, IOL = 16 mA, 0.3 0.6 UNIT V V V 2.6 V 2.6 IOL = 16 mA VI(S) = 2 V, See Note 4 0.4 0.4 VI = 4.5 V VI = 3.8 V VI = 0.4 V, VCC = 5 V, MAX 5.5 High-level output voltage VIL = 0.8 V, TYP† –1.5 IOH = – 500 µA VI(A) = 0, VI(B) = 0, VI(S) = 2 V, VI(R) = 1.45 V, IOH = – 500 µA, See Note 3 VOH MIN 40 170 V µA VIR = 0.8 V – 0.1 –1.6 mA TA = 25°C All inputs at 0.8 V, – 50 –100 mA 72 mA 100 mA TYP MAX UNIT 20 30 20 30 ICCH High-level supply current VCC = MAX, Outputs open ICCL Low-level supply current VCC = MAX, All inputs at 2 V, Outputs open † All typical values are at VCC = 5 V and TA = 25°C. ‡ Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second. NOTES: 3. The receiver input is high immediately before being reduced to 1.45 V. 4. The receiver input is low immediately before being increased to 1.45 V. switching characteristics, VCC = 5 V, TA = 25°C PARAMETER tPLH tPHL 2–4 TEST CONDITIONS Propagation delay time, low-to-high-level output from R input Propagation delay time, high-to-low-level output from R input POST OFFICE BOX 655303 See Figure 1 • DALLAS, TEXAS 75265 MIN ns N8T14, SN55122, SN75122 TRIPLE LINE RECEIVERS SLLS075B – D1334, SEPTEMBER 1973 – REVISED FEBRUARY 1993 PARAMETER MEASUREMENT INFORMATION ≤ 5 ns 2.6 V VCC 84.5 Ω Pulse Generator (see Note A) 90% 1.5 V Input 2.6 V 90% 1.5 V 10% 10% 1N3064 0V tPLH Output CL = 30 pF ≤ 5 ns tPHL 5 kΩ VOH 1.5 V Output (see Note B) 1.5 V VOL TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: A. The pulse generator has the following characteristics: ZO = 50 Ω, tw = 200 ns, duty cycle = 50%, PRR ≤ 500 kHz. B. CL includes probe and jig capacitance. Figure 1. Test Circuit and Voltage Waveforms TYPICAL CHARACTERISTICS OUTPUT VOLTAGE vs INPUT VOLTAGE 4 VCC = 5 V No Load TA = 25_C VO VO – Output Voltage – V 3.5 3 2.5 2 VT – VT + 1.5 1 0.5 0 0 0.4 0.8 1 1.4 1.8 2 VVII – Input Voltage – V Figure 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–5 N8T14, SN55122, SN75122 TRIPLE LINE RECEIVERS SLLS075B – D1334, SEPTEMBER 1973 – REVISED FEBRUARY 1993 APPLICATION INFORMATION 1/3 SN55122 75-Ω Coaxial Cable 75-Ω Coaxial Cable 1/3 SN55122 75 Ω 75 Ω 1/2 SN55121 1/2 SN55121 75-Ω Coaxial Cable 75 Ω 1/3 SN55122 75 Ω 1/2 SN55121 1/2 SN55121 Figure 3. Single-Ended Party Line Circuits R Input VIH VT + VT – VIL VOH Output VOL NOTE: The high gain and built-in hysteresis of the SN55122 and SN75122 line receivers enable them to be used as Schmitt triggers in squaring pulses. Figure 4. Pulse Squaring 2–6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current and complete. TI warrants performance of its semiconductor products and related software 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”). 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