This 1-bit to 4-bit address register/driver is designed for 1.65-V to 3.6-V VCC operation. This device is ideal for use in applications in which a single address bus is driving four separate memory locations. The SN74ALVCH16832 can be used as a buffer or a register, depending on the logic level of the select (SEL)\ input.
When SEL\ is a logic high, the device is in the buffer mode. The outputs follow the inputs and are controlled by the two output-enable (OE)\ inputs. Each OE\ controls two groups of seven outputs.
When SEL\ is a logic low, the device is in the register mode. The register is an edge-triggered D-type flip-flop. On the positive transition of the clock (CLK) input, data at the A inputs is stored in the internal registers. OE\ operates the same as in the buffer mode.
When OE\ is a logic low, the outputs are in a normal logic state (high or low logic level). When OE\ is a logic high, the outputs are in the high-impedance state.
Neither SEL\ nor OE\ affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.
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