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TXB0104-Q1: Operating process

Kevin SHIN
Prodigy 495 points
Part Number: TXB0104-Q1

Hello I'm Kevin.

Customer wondered about operating process of TXB0104-Q1.

 

There are inverting buffers and one shot circuitry.

1. Why do we need inverting buffer?

2. How are one-shot circuits active upper one and lower one?

  • 0
    Guru 243820 points

    All CMOS buffers are inverters; a non-inverting buffer would require two inverters in series.

    A Guide to Voltage Translation With TXB-Type Translators says:

    The TXB translators incorporate a weak buffer with one-shot (O.S.) circuitry to improve switching speeds for rising and falling edges. When the A-port is connected to a system driver and driven high, the weak 4-kΩ buffer drives the B-port high in conjunction with the upper one shot, which becomes active when it senses a rising edge. The B-port is driven high by both the buffer and the T1 PMOS, which lowers the output impedance seen on the B-port while the O.S. circuit is active. On the falling edge, the lower O.S. is triggered and the buffer, along with the T2 NMOS, lowers the output impedance seen on the B-port while the O.S. circuit is operating and the output is driven low.