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• Logic - Signal Switches, Multiplexers, Decoders

The SN74CBT3125PWRE4 is an octal buffer/line driver and bus-hold with 3-State bus output transmision gates manufactured by Texas Instruments. It is designed to be used with respective TTL logic family. The device integrates eight octal inverters having quad two-input signal switches, multiplexers, decoders and a bus hold circuit used to retain data present at the device inputs when the select signal sthe SN74CBT3125PWRE4 application field and working principle. The low-power Schottky transistor reduces power dissipation over the 74S C-MOS device. This device is a 3-State Buffer, with bus-hold, specifically designed for 1.8 V operation. It is fabricated using TI\'s advanced low-power CMOS process.

The SN74CBT3125PWRE4 features a dual 3-State OCTAL Buffer and Line Driver with a pair of two-input signal switchers, multiplexers, and decoders, and a bus hold circuit. The device controls the data (Data Inputs) present at the eight outputs when the select signal is asserted. In other words, the device provides a logic "Level shifter"? between various logic families integrated in a database, communications, servers, personal computers and other peripherals. The device is capable of providing a rail-to-rail output swing for a wide range of input values.

The SN74CBT3125PWRE4 features a voltage range from 1.8 V to 5.5 V which is compliant with LVTTL, LVCMOS, and SSTL. The input voltage range depends on the VCC voltage. The device has a high-impedance when the output is disabled (in "high-Z" state) and in this state, it is also possible to disconnect the device from the bus by setting the Select Signal to "high". A bus hold circuit prevents indeterminate bus conditions caused due to externally applied noise. The device also has slew rate control feature that essentially increases the output rise and fall times.

The SN74CBT3125PWRE4 device has two general application fields, namely, System buses and multi-drop local area networks. In system buses application areas, it is used to connect two low-voltage logic families. In systems such as LANs and GPIBs, it is used as a level shifter for logic families operating at different voltage levels. This device provides high speed data transmission between two buses operated at different voltage level without any loss of data due to leakage. The device also provides bidirectional data transmission by multiplexing one of the data inputs at a time. In order to interface two buses, the device should be connected in oppositely oriented pairs.

The SN74CBT3125PWRE4 is also able to drive high loads, as in multiple drop applications, and is also suitable for use in Hot-Swapping circuits, by having the enable output indicative of the voltage that is being applied to the device. Moreover, the device is quite robust and supports higher levels of noise immunity than standard CMOS or TTL devices, due to its increased noise margin.

To summarize, the SN74CBT3125PWRE4 is an octal buffer/line driver and bus-hold with 3-state bus output, which is specifically designed for 1.8 V operation. The device is able to provide a logic "level shifter" between various logic families and can drive high loads, as in multiple drop applications. The device features a voltage range from 1.8 V to 5.5 V and is compliant with LVTTL, LVCMOS, and SSTL. In addition, the device also has a slew rate control, which increases the output rise and fall times and supports higher levels of noise immunity than other devices. Therefore, the SN74CBT3125PWRE4 is an ideal solution for interfacing two logic families, system buses and multi-drop local area networks.

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