1. General description

The 74LVT16500A is a high-performance BiCMOS product designed for VCC operation at

3.3 V.

This device is an 18-bit universal transceiver featuring non-inverting 3-state bus

compatible outputs in both send and receive directions. Data flow in each direction is

controlled by output enable (OEAB and OEBA), latch enable (LEAB and LEBA), and clock

(CPAB and CPBA) inputs. For A-to-B data flow, the device operates in the transparent

mode when LEAB is HIGH. When LEAB is LOW, the A data is latched if CPAB 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 HIGH-to-LOW transition of CPAB. 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 OEBA, LEBA and CPBA. The

output enables are complimentary (OEAB is active HIGH, and OEBA is active LOW).

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic

level.

2. Features

n 18-bit bidirectional bus interface

n 3-state buffers

n Output capability: +64 mA and -32 mA

n TTL input and output switching levels

n Input and output interface capability to systems at 5 V supply

n Bus-hold data inputs eliminate the need for external pull-up resistors to hold unused

inputs

n Live insertion/extraction permitted

n Power-up reset

n Power-up 3-state

n No bus current loading when output is tied to 5 V bus

n Negative edge-triggered clock inputs

n Latch-up protection:

u JESD78: exceeds 500 mA

n ESD protection:

u MIL STD 883 Method 3015: exceeds 2000 V

u CDM JESD22-C101-C exceeds 1000 V