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SNJ55107AJ Datasheet(PDF) 10 Page - Texas Instruments |
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SNJ55107AJ Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page SN55107A, SN75107A, SN75107B, SN75108A DUAL LINE RECEIVERS SLLS069D – JANUARY 1977 – REVISED APRIL 1998 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION basic balanced-line transmission system The ’107A, SN75107B, and SN75108A dual line devices are designed specifically for use in high-speed data-transmission systems that utilize balanced terminated transmission lines, such as twisted-pair lines. The system operates in the balanced mode, so noise induced on one line is also induced on the other. The noise appears common mode at the receiver input terminals, where it is rejected. The ground connection between the line driver and receiver is not part of the signal circuit; therefore, system performance is not affected by circulating ground currents. The unique driver-output circuit allows terminated transmission lines to be driven at normal line impedances. High-speed system operation is ensured because line reflections are virtually eliminated when terminated lines are used. Crosstalk is minimized by low signal amplitudes and low line impedances. The typical data delay in a system is approximately 30 + 1.3 L ns, where L is the distance in feet separating the driver and receiver. This delay includes one gate delay in both the driver and receiver. Data is impressed on the balanced-line system by unbalancing the line voltages with the driver output current. The driven line is selected by appropriate driver-input logic levels. The voltage difference is approximately: VDIFF ≈ 1/2IO(on) • RT High series line resistance causes degradation of the signal. However, the receivers detect signals as low as 25 mV. For normal line resistances, data can be recovered from lines of several thousand feet in length. Line-termination resistors (RT) are required only at the extreme ends of the line. For short lines, termination resistors at the receiver only may be adequate. The signal amplitude is then approximately: VDIFF ≈ IO(on) • RT Transmission Line Having Characteristic Impedance ZO RT = ZO/2 L RT RT A B C D Strobes RT RT Y Receiver ‘107A, SN75107B, SN75108A Driver SN55110A, SN75110A, SN75112 Data Input Inhibit Figure 11. Typical Differential Data Line data-bus or party-line system The strobe feature of the receivers and the inhibit feature of the drivers allow these dual line devices to be used in data-bus or party-line systems. In these applications, several drivers and receivers can share a common transmission line. An enabled driver transmits data to all enabled receivers on the line while other drivers and receivers are disabled. Data is time multiplexed on the transmission line. The device specifications allow widely varying thermal and electrical environments at the various driver and receiver locations. The data-bus system offers maximum performance at minimum cost. |
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