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SN74AVCH4T245DT Datasheet(PDF) 1 Page - Texas Instruments |
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SN74AVCH4T245DT Datasheet(HTML) 1 Page - Texas Instruments |
1 / 19 page www.ti.com FEATURES 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCCA 1DIR 2DIR 1A1 1A2 2A1 2A2 GND VCCB 1OE 2OE 1B1 1B2 2B1 2B2 GND D, DGV, OR PW PACKAGE (TOP VIEW) RGY PACKAGE (TOP VIEW) 1 16 8 9 2 3 4 5 6 7 15 14 13 12 11 10 1OE 2OE 1B1 1B2 2B1 2B2 1DIR 2DIR 1A1 1A2 2A1 2A2 DESCRIPTION/ORDERING INFORMATION SN74AVCH4T245 4-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS SCES577B – JUNE 2004 – REVISED FEBRUARY 2006 • Control Inputs V IH/VIL Levels Are Referenced • Latch-Up Performance Exceeds 100 mA Per to V CCA Voltage JESD 78, Class II • Fully Configurable Dual-Rail Design Allows • ESD Protection Exceeds JESD 22 Each Port to Operate Over the Full 1.2-V to – 8000-V Human-Body Model (A114-A) 3.6-V Power-Supply Range – 200-V Machine Model (A115-A) • I/Os Are 4.6-V Tolerant – 1000-V Charged-Device Model (C101) • I off Supports Partial Power-Down-Mode Operation • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors This 4-bit noninverting bus transceiver uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.2 V to 3.6 V. The SN74AVCH4T245 is optimized to operate with VCCA/VCCB set at 1.4 V to 3.6 V. It is operational with VCCA/VCCB as low as 1.2 V. This allows for universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes. The SN74AVCH4T245 is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the outputs so the buses are effectively isolated. The SN74AVCH4T245 is designed so that the control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by VCCA. 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 both ports are in the high-impedance state. The bus-hold circuitry on the powered-up side always stays active. 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. 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. 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. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2006, 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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