SN74LVT162245ADGGR

The 'LVT162245A devices are 16-bit (dual-octal) noninverting 3-state transceivers designed for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment. These devices are designed for asynchronous communication between two 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 is always active and must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ. The A-port outputs, which are designed to source or sink up to 12mA, include equivalent 22-Ω series resistors to reduce overshoot and undershoot. When VCC is between 0 and 1.5V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5V, 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. These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.

Applications

• Asynchronous communication between two data buses
• Hot-plug applications

Key features

• A-Port Outputs Have Equivalent 22-Ω Series Resistors, So No External Resistors Are Required
• Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V Vcc)
• Support Unregulated Battery Operation Down to 2.7 V
• Typical Volp (Output Ground Bounce) < 0.8V at VCC = 3.3V, TA = 25℃
• Ioff and Power-Up 3-State Support Hot Insertion
• Distributed Vcc and GND Pins Minimize High-Speed Switching Noise
• Flow-Through Architecture Optimizes PCB Layout
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) 200-V Machine Model (A115-A) 1000-V Charged-Device Model (C101)