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SN54ALVTH16821 Datasheet(PDF) 2 Page - Texas Instruments |
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SN54ALVTH16821 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 11 page SN54ALVTH16821, SN74ALVTH16821 2.5-V/3.3-V 20-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS SCES078E – JULY 1996 – REVISED JANUARY 1999 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) A buffered output-enable (OE) input can be used to place the ten outputs in either a normal logic state (high or low level) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without need for interface or pullup components. OE does not 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. When VCC is between 0 and 1.2 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.2 V, 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 is provided to hold unused or floating data inputs at a valid logic level. The SN54ALVTH16821 is characterized for operation over the full military temperature range of –55 °C to 125 °C. The SN74ALVTH16821 is characterized for operation from –40°C to 85°C. FUNCTION TABLE (each 10-bit section) INPUTS OUTPUT OE CLK D Q L ↑ H H L ↑ LL L H or L X Q0 H X X Z |
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