1. General description

The 74AXP4T245 is an 4-bit dual supply translating transceiver with 3-state outputs that enable

bidirectional level translation. The device can be used as two 2-bit transceivers or as a 4-bit

transceiver. It features four 2-bit input-output ports (nAn and nBn), a direction control input (nDIR),

a output enable input (nOE) and dual supply pins (VCC(A) and VCC(B)). Both VCC(A) and VCC(B) can

be supplied at any voltage between 0.9 V and 5.5 V making the device suitable for translating

between any of the low voltage nodes (0.9 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5.0 V). No power

supply sequencing is required and output glitches during power supply transitions are prevented

using patented circuitry. As a result glitches will not appear on the outputs for supply transitions

during power-up/down between 20 mV/μs and 5.5 V/s.

Pins nAn, nOE and nDIR are referenced to VCC(A) and pins nBn are referenced to VCC(B). A HIGH

on nDIR allows transmission from nAn to nBn and a LOW on nDIR allows transmission from nBn to

nAn. The output enable input (nOE) can be used to disable the outputs so the buses are effectively

isolated.

The device is fully specified for partial power-down applications using IOFF. The IOFF circuitry

disables the output, preventing any damaging backflow current through the device when it is

powered down. In suspend mode when either VCC(A) or VCC(B) are at GND level, both nAn and nBn

are in the high-impedance OFF-state.

2. Features and benefits

? Wide supply voltage range:

? VCC(A): 0.9 V to 5.5 V

? VCC(B): 0.9 V to 5.5 V

? Low input capacitance; CI = 1.2 pF (typical)

? Low output capacitance; CO = 3.6 pF (typical)

? Low dynamic power consumption; CPD = 10 pF (typical)

? Low static power consumption; ICC = 2 μA (25 °C maximum)

? High noise immunity

? Complies with JEDEC standard:

? JESD8-12 (1.1 V to 1.3 V; inputs)

? JESD8-11 (1.4 V to 1.6 V)

? JESD8-7 (1.65 V to 1.95 V)

? JESD8-5 (2.3 V to 2.7 V)

? JESD8C (2.7 V to 3.6 V)

? JESD12-6 (4.5 V to 5.5 V)

? ESD protection:

? HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2 kV

? CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1 kV

? Latch-up performance exceeds 100 mA per JESD78D Class II

? Inputs accept voltages up to 5.5 V

? Low noise overshoot and undershoot < 10 of VCCO

? IOFF circuitry provides partial power-down mode operation

? Specified from -40 °C to +125 °C