The 'LVT16501 are 18-bit universal bus 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.
Data flow in each direction is controlled by output-enable (OEAB
and ), latch-enable
(LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data
flow, the devices operate in the transparent mode when LEAB is high.
When LEAB is low, the A data is latched if CLKAB is held at a high or
low logic level. If LEAB is low, the A-bus data is stored in the
latch/flip-flop on the low-to-high transition of CLKAB. When OEAB is
high, the outputs are active. When OEAB is low, the outputs are in
the high-impedance state.
Data flow for B to A is similar to that of A to B but uses , LEBA, and CLKBA. The output
enables are complementary (OEAB is active high and is active low).
Active bus-hold circuitry is provided to hold unused or floating
data inputs at a valid logic level.
To ensure the high-impedance state during power up or power down,
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. OE should be tied to GND through a pulldown resistor; the
minimum value of the resistor is determined by the current-sourcing
capability of the driver.
The SN74LVT16501 is available in TI's shrink small-outline (DL)
and thin shrink small-outline (DGG) packages, which provide twice the
input/output (I/O) pin count and functionality of standard
small-outline packages in the same printed circuit board area.
The SN54LVT16501 is characterized for operation over the full
military temperature range of -55°C to 125°C. The
SN74LVT16501 is characterized for operation from -40°C to
85°C.
The 'LVT16501 are 18-bit universal bus 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.
Data flow in each direction is controlled by output-enable (OEAB
and ), latch-enable
(LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data
flow, the devices operate in the transparent mode when LEAB is high.
When LEAB is low, the A data is latched if CLKAB is held at a high or
low logic level. If LEAB is low, the A-bus data is stored in the
latch/flip-flop on the low-to-high transition of CLKAB. When OEAB is
high, the outputs are active. When OEAB is low, the outputs are in
the high-impedance state.
Data flow for B to A is similar to that of A to B but uses , LEBA, and CLKBA. The output
enables are complementary (OEAB is active high and is active low).
Active bus-hold circuitry is provided to hold unused or floating
data inputs at a valid logic level.
To ensure the high-impedance state during power up or power down,
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. OE should be tied to GND through a pulldown resistor; the
minimum value of the resistor is determined by the current-sourcing
capability of the driver.
The SN74LVT16501 is available in TI's shrink small-outline (DL)
and thin shrink small-outline (DGG) packages, which provide twice the
input/output (I/O) pin count and functionality of standard
small-outline packages in the same printed circuit board area.
The SN54LVT16501 is characterized for operation over the full
military temperature range of -55°C to 125°C. The
SN74LVT16501 is characterized for operation from -40°C to
85°C.