74AXP2T45屬于集成電路（IC）的轉(zhuǎn)換器電平移位器。由安世半導(dǎo)體(中國)有限公司制造生產(chǎn)的74AXP2T45轉(zhuǎn)換器，電平移位器邏輯轉(zhuǎn)換器或電平移位器 IC 可用于在數(shù)字邏輯設(shè)備之間傳遞信息，這些設(shè)備可在不同/不兼容的供電電壓下工作，或可實(shí)現(xiàn)不同的信令方式。例如，可以將需要 5 V 電源的數(shù)字輸出傳感器連接到具有 3.3 V I/O 電源的 FPGA，或者在 CMOS 或 TTL 等單端信令方式與 PECL 或 LVDS 等差分技術(shù)之間進(jìn)行轉(zhuǎn)換。

1. General description

The 74AXP2T45 is a 2-bit, dual supply transceiver with 3-state outputs that enables bidirectional

level translation. It features two 2-bit input-output ports (nA and nB), a direction control input

(DIR) 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 A and DIR are referenced to VCC(A) and pin B is referenced

to VCC(B). A HIGH on DIR allows transmission from A to B and a LOW on DIR allows transmission

from B to A.

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 A and B 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 = 1.4 pF (typical)

? Low output capacitance; CO = 4.4 pF (typical)

? Low dynamic power consumption; CPD = 11 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