UM3304 Datasheet, PDF (9/15 Pages) ShenZhen XinDeYi Electronics Co., Ltd. – N-Ch and P-Ch 30V Fast Switching MOSFETs

UM3304/UM3304Q/UM3304QT
Applications Information
UM3304/UM3304Q/UM3304QT ESD protected level translator provides level shifting necessary
to allow data transfer in a multi-voltage system. Externally applied voltages, V_CCA and V_CCB set
the logic levels on either side of device. A low voltage signal present on V_CCA side of the device
appears as a high voltage logic signal on the V_CCB side of the device, and vice-versa.
Block Diagram
The UM3304/UM3304Q/UM3304QT (block diagram see Figure 1) does not require a
direction-control signal to control the direction of data flow from A to B or from B to A. In a dc
state, the output drivers of the UM3304/UM3304Q/UM3304QT can maintain a high or low, but
are designed to be weak, so that they can be overdriven by an external driver when data on the bus
starts flowing the opposite direction.
The output one shot detects rising or falling edges on the A or B ports. During a rising edge, the
one shot turns on the PMOS transistors (T1, T3) for a short duration, which speeds up the
low-to-high transition. Similarly, during a falling edge, the one shot turns on the NMOS
transistors (T2, T4) for a short duration, which speeds up the high-to-low transition.
Figure 1 Block Diagram of UM3304/UM3304Q/UM3304QT I/O Cell
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http://www.union-ic.com Rev.11 Sep.2013
9/15