0
ACTIVE
Supply voltage (min) (V) |
2.7 |
Supply voltage (max) (V) |
3.6 |
Number of channels |
16 |
IOL (max) (mA) |
48 |
IOH (max) (mA) |
-48 |
Input type |
TTL/CMOS |
Output type |
LVTTL |
Features |
Balanced outputs, Bus-hold, Damping resistors, Over-voltage tolerant inputs, Partial power down (Ioff), Ultra high speed (tpd <5ns) |
Technology family |
LVT |
Rating |
Space |
Operating temperature range (°C) |
-55 to 125 |
CFP (WD)-48-153.4008 mm² 15.88 x 9.66
Series Resistors, So No External Resistors Are RequiredWidebus is a trademark of Texas Instruments.
The 'LVTH162245 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 can be used as two 8-bit transceivers or one 16-bit transceiver. The devices allow data transmission 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 device so that the buses are effectively isolated.
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.
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.
The A-port outputs, which are designed to source or sink up to 12 mA, include equivalent 22- series resistors to reduce overshoot and undershoot.
When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, 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.
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