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Building Automation? Electronic Point of Sale? Factory Automation and Control? Test and Measurement 3 Description These octal bus transceivers are designed for asynchronous two-way communication between data buses.
The control-function implementation minimizes external timing requirements. The output-enable OE input can disable the device so that the buses are effectively isolated. On all other products, production processing does not necessarily include testing of all parameters. UNIT V 7.
A —? CL includes probe and jig capacitance. All diodes are 1N or equivalent. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
Phase relationships between inputs and outputs have been chosen arbitrarily for these examples. The outputs are measured one at a time with one input transition per measurement.
Figure 2. Load Circuits and Voltage Waveforms Copyright? This standard logic function has a common pinout, direction select pin, and active-low output enable. When the outputs are disabled, the A and B sides of the device are effectively isolated.
Logic Diagram Positive Logic 9. All outputs can be put into high impedance mode through the OE pin. Schematics of Inputs and Outputs Copyright? Customers should validate and test their design implementation to confirm system functionality. It allows isolation from the bus when necessary, and increases drive strength on the bus. Take care to avoid bus contention because it can drive currents that would exceed maximum limits. The high drive creates fast edges into light loads, so routing and load conditions must be considered to prevent ringing.
Power Supply — Each device must maintain a supply voltage between 4. See Electrical Characteristics for details. Figure 6 shows a simplified simulation of a ribbon cable from a 5-V, MHz low-drive strength source. By adding a high-current drive transceiver before the cable, the signal strength can be significantly improved, and subsequently the cable can be longer.
Both signals are measured at the distant end of the ribbon cable. Input signal is not shown. Figure 6. Each VCC pin must have a good bypass capacitor to prevent power disturbance. For devices with a single supply, TI recommends a 0. F bypass capacitor. F bypass capacitors for each power pin. It is acceptable to parallel multiple bypass capacitors to reject different frequencies of noise.
Two bypass capacitors of value 0. F and 1? F are commonly used in parallel. For best results, install the bypass capacitor s as close to the power pin as possible.
In many applications, some channels of the SNx4LS are unused, and thus must be terminated properly. Because each transceiver channel pin can be either an input or an output, they must be treated as both when being terminated.
Ground or VCC whichever is more convenient can be used to terminate unused inputs; however, each unused channel should be terminated to the same logic level on both the A and B side.
For example, in Figure 7 unused channels 4, 5, 6, and 7 are terminated correctly with both sides connected to the same voltage, while channel 8 is terminated incorrectly with each side being tied to a different voltage.
The OE input is also unused in this example, and is terminated directly to ground to permanently enable all outputs. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy.
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The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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For browser-based versions of this data sheet, refer to the left-hand navigation. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
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TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Military: SN54LS? Space - Radiation tolerant, ceramic packaging and qualified for use in Space-based application 1-Sep Addendum-Page 3 www. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. This drawing is subject to change without notice.
This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0. This dimension does not include interlead flash. Interlead flash shall not exceed 0. Publication IPC may have alternate designs.
Solder mask tolerances between and around signal pads can vary based on board fabrication site. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC may have alternate design recommendations.
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74LS245 TTL Octal Bus Transceiver
Logic - Buffers, Drivers, Receivers, Transceivers
Stock/Availability for: SN74LS245N