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74LVCH16245ADLRG4 データシート(PDF) 1 Page - Texas Instruments |
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74LVCH16245ADLRG4 データシート(HTML) 1 Page - Texas Instruments |
1 / 17 page www.ti.com FEATURES DESCRIPTION/ORDERING DGG, DGV, OR DL PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 1DIR 1B1 1B2 GND 1B3 1B4 VCC 1B5 1B6 GND 1B7 1B8 2B1 2B2 GND 2B3 2B4 VCC 2B5 2B6 GND 2B7 2B8 2DIR 1OE 1A1 1A2 GND 1A3 1A4 VCC 1A5 1A6 GND 1A7 1A8 2A1 2A2 GND 2A3 2A4 VCC 2A5 2A6 GND 2A7 2A8 2OE This device can be used as two 8-bit transceivers or one 16-bit transceiver. SN74LVCH16245A 16-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS SCES495B – OCTOBER 2003 – REVISED AUGUST 2006 • Member of the Texas Instruments Widebus™ Family • Operates From 1.65 V to 3.6 V • Inputs Accept Voltages to 5.5 V • Max tpd of 4 ns at 3.3 V • Typical VOLP (Output Ground Bounce) <0.8 V at VCC = 3.3 V, TA = 25°C • Typical VOHV (Output VOH Undershoot) >2 V at VCC = 3.3 V, TA = 25°C • Supports Mixed-Mode Signal Operation on All Ports (5-V Input/Output Voltage With 3.3-V VCC) • Ioff Supports Partial-Power-Down Mode Operation • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors • Latch-Up Performance Exceeds 250 mA Per JESD 17 • ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) INFORMATION This 16-bit (dual-octal) noninverting bus transceiver is designed for 1.65-V to 3.6-V VCC operation. The SN74LVCH16245A is designed for asynchronous communication between data buses. The logic levels of the direction-control (DIR) input and the output-enable (OE) input activate either the B-port outputs or the A-port outputs or place both output ports into the high-impedance mode. The device transmits data from the A bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputs are activated. The input circuitry on both A and B ports always is active and must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ. 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. The bus-hold circuitry is part of the input circuit and is not disabled by OE or DIR. 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 these devices as translators 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. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Widebus is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2003–2006, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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同様の説明 - 74LVCH16245ADLRG4 |
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