SN74LVC126APWRG4

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The SN74LVC126APWRG4 is a 3-state octal buffer/line driver used for a variety of applications. This review is divided into two sections, first covering the fields of application, and secondly the operating principle.

Application fields

The SN74LVC126APWRG4 is a low-voltage interface between 5V TTL circuits and 3.3V CMOS systems. It can be used to drive up to 8 bidirectional address lines and provides a low-current logic level output, while dissipating far less current than an FET bus driver. In addition, its very small package size allows it to be mounted on a small PCB and makes it suitable for use in portable devices that require low-voltage logic interface.

The IC is also suitable for applications relying on numerous digital signal lines, especially when support for wide temperature ranges and wide supply-voltage ranges is needed. Common uses for this device include serial-data buses, memory (SRAM, ROM, EEPROM, FIFO, video RAM) interface applications, high-speed microprocessor and coprocessor buses, and interfacing with 3.3V CMOS logic systems.

The device features parallel bus I/O, with buffering that can be easily programmed as needed. It can be used in TTL-level or ECL-level logic systems and in high-speed clock lines, having a signal frequency of up to 200 MHz. In addition, the SN74LVC126APWRG4 has a high standby current and is compliant with the low power standby voltage requirements of the European RoHS directive.

Operating Principle

The SN74LVC126APWRG4\'s function follows from its logic diagram as 8-channel, 3-state buffer/line driver. This means that it acts as an output device, with a maximum output voltage of 5V, and a minimum voltage of 1V. The power input of the device is indicated by a Vcc symbol, and ranges from 1.65V to 5.5V.

The device contains 8 independent channels, each made up of a two-inverter balanced latch that was designed to operate at low power supply voltages while still utilizing full-logic swing. Additionally, each channel has an output enable (OE) control pin. When OE is high, the outputs of each channel are in the high-impedance state.

The SN74LVC126APWRG4 has open-drain outputs, which means that the output is high-impedance when inactive and isolates the device from the load circuit. Input pins of each channel have TTL/CMOS-compatible threshold levels and can be used to control either TTL- or CMOS-type logic circuits. Furthermore, the outputs have a pullup which helps to ensure that data is transferred correctly.

The device is designed for use in high-speed systems. Each channel is specified to operate up to a maximum frequency of 200 MHz, allowing systems to be clocked at the required rate without significant data loss. Lastly, the SN74LVC126APWRG4 is designed to operate at very low power levels, reducing the overall power consumption of the system.

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