74AXP8T245集成電路（IC）的緩沖器驅(qū)動(dòng)器接收器收發(fā)器規(guī)格書PDF中文資料

1. General description

The 74AXP8T245 is an 8-bit dual supply translating transceiver with 3-state outputs that enable

bidirectional level translation. It features two data input-output ports (pins An and Bn), a direction

control input (DIR), an output enable input (OE) 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 An, OE and DIR are referenced to VCC(A) and pins Bn are referenced to VCC(B). A HIGH on

DIR allows transmission from An to Bn and a LOW on DIR allows transmission from Bn to An. The

output enable input (OE) can be used to disable the outputs so the buses are effectively isolated.

The devices are 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 An and Bn

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 = 1.5 pF (typical)

? Low output capacitance; CO = 3.8 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