SN75178BPSR

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The SN75178BPSR is an integrated circuit (IC) from Texas Instruments that provides a low-cost interface buffer and switches to local area networks using the Manchester code. It has a typical operating voltage range of 6 to 15 volts and a power consumption of 8.3 mW. The SN75178BPSR is a 4-bit parallel bus transceiver, capable of driving and receiving four unidirectional data lines. Its output drive current is 35 mA and it has a low delay time of 15 nsec. The SN75178BPSR is used in computer networking applications and Ethernet protocol communication.

Application field

The SN75178BPSR is an ideal interface buffer for local area networks utilizing Manchester code. It is used typically in computer networking applications where data must be transmitted in parallel over Cat5 or Cat6 Ethernet cables. It is also used for communication in Enhanced Network Adaptation (ENQ) systems. Applications of the SN75178BPSR include point-of-sale (POS) terminals and remote access to security system networks.

Working Principle

The SN75178BPSR operates as a two-port data transceiver and utilizes a low-cost, 4-bit parallel bus. As a transceiver, it functions as a link between two buses. The device supports operation in unidirectional and bidirectional modes which can be configured through the DE and RE pins that enable the device to be used in a half-duplex, full-duplex or multi-drop data transceiver system. The DE and RE lines are configurable by a high or low level depending on the desired data flow.

The SN75178BPSR has two data ports: an input port and an output port. The input port is used to receive data from the bus, while the output port is used to transmit data to the bus. The two ports can be used together to perform half-duplex or full-duplex communication, or they can be used separately for unidirectional data transmission. The Clock (not the DE or RE pins) of the device must be at a High level when the data lines are valid. The data outputs of the SN75178BPSR will remain Fall Until Clock (FTC) when the Clock is Low and the data is valid, but will immediately latch and drive the bus the moment the Clock is High. This will ensure that valid data is read from the bus. The bus transceivers will also maintain valid data at the data lines for longer than 20 ns when the Clock has returned to the low level.

When transmitting data from the SN75178BPSR, the output of the device is connected to the data lines of the local area network. The output data will be transmitted serially via Manchester code. When transmitting data from the SN75178BPSR, the device must first be enabled by the DE or RE pins. When enabled, the output signals will be transmitted serially via the local area network. When disabled, the output signals will be held in the high-level state.

The SN75178BPSR is a very powerful "data switching" device. It is ideal for applications that require bidirectional communication over a local area network, as well as for applications that require the transmission of data in the Manchester code. Its ability to latch valid data quickly and keep it valid for a longer period when the Clock is low ensures reliable communication. Its ability to seamlessly switch states between Input and Output ports allows it to be used in both unidirectional and bidirectional communication. With its low power consumption and wide operating voltage range, the SN75178BPSR is an ideal alternative to high-cost transceivers.

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