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LDHT245 Datasheet(PDF) 2 Page - Texas Instruments |
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LDHT245 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 15 page  www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) GQL OR ZQL PACKAGE (TOP VIEW) J H G F E D C B A 2 1 3 4 6 5 K SN74LVCH16T245 16-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS SCES635A – JULY 2005 – REVISED AUGUST 2005 Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. 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. The VCC isolation feature ensures that if either VCC input is at GND, then all outputs are in the high-impedance state. The bus-hold circuitry on the powered-up side always stays active. 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. TERMINAL ASSIGNMENTS(1) 1 2 3 4 5 6 A 1DIR NC NC NC NC 1OE B 1B2 1B1 GND GND 1A1 1A2 C 1B4 1B3 VCCB VCCA 1A3 1A4 D 1B6 1B5 GND GND 1A5 1A6 E 1B8 1B7 1A7 1A8 F 2B1 2B2 2A2 2A1 G 2B3 2B4 GND GND 2A4 2A3 H 2B5 2B6 VCCB VCCA 2A6 2A5 J 2B7 2B8 GND GND 2A8 2A7 K 2DIR NC NC NC NC 2OE (1) NC – No internal connection FUNCTION TABLE(1) (EACH 16-BIT SECTION) CONTROL INPUTS OUTPUT CIRCUITS OPERATION OE DIR A PORT B PORT L L Enabled Hi-Z B data to A bus L H Hi-Z Enabled A data to B bus H X Hi-Z Hi-Z Isolation (1) Input circuits of the data I/Os are always active. 2 |
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