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SN74LVCH16543ADLR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVCH16543ADLR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 18 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) GQL OR ZQL PACKAGE (TOP VIEW) 1 2 3 4 A B C D E F G H J K 5 6 SN74LVCH16543A 16-BIT REGISTERED TRANSCEIVER WITH 3-STATE OUTPUTS SCAS317M – NOVEMBER 1993 – REVISED MARCH 2005 The A-to-B enable (CEAB) input must be low to enter data from A or to output data from B. If CEAB is low and LEAB is low, the A-to-B latches are transparent; a subsequent low-to-high transition of LEAB puts the A latches in the storage mode. With CEAB and OEAB both low, the 3-state B outputs are active and reflect the data present at the output of the A latches. Data flow from B to A is similar, but requires using the CEBA, LEBA, and OEBA inputs. 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. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V/5-V system environment. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input circuit and is not disabled by OE or DIR. TERMINAL ASSIGNMENTS 1 2 3 4 5 6 A 1CEAB 1LEAB 1OEAB 1OEBA 1LEBA 1CEBA B 1A2 1A1 GND GND 1B1 1B2 C 1A4 1A3 VCC VCC 1B3 1B4 D 1A6 1A5 GND GND 1B5 1B6 E 1A8 1A7 1B7 1B8 F 2A1 2A2 2B2 2B1 G 2A3 2A4 GND GND 2B4 2B3 H 2A5 2A6 VCC VCC 2B6 2B5 J 2A7 2A8 GND GND 2B8 2B7 K 2CEAB 2LEAB 2OEAB 2OEBA 2LEBA 2CEBA 2 |
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