NXP Semiconductors 74AVCH16T245EV,518

Overview

74AVCH16T245EV,518 from Nexperia is a 16-bit dual-supply translating transceiver with bidirectional level-shifting, 3-state outputs, and independent VCC(A) and VCC(B) rails (0.8 V to 3.6 V). It functions as two independent 8-bit transceivers or one unified 16-bit unit, supports voltage translation between 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains, and integrates bus-hold circuitry and IOFF partial power-down protection. It is used in mixed-voltage SoC interconnects, FPGA I/O bridging, and DDR memory interface voltage adaptation.

For engineers reviewing the 74AVCH16T245EV,518 datasheet, 74AVCH16T245EV,518 pinout, 74AVCH16T245EV,518 application, or 74AVCH16T245EV,518 equivalent, this device delivers configurable direction control per port pair, suspend-mode high-impedance isolation when either supply is grounded, and JEDEC-compliant operation across six voltage standards - critical for low-power embedded systems requiring robust signal integrity across heterogeneous voltage domains.

Technical Context

The device implements two independent 8-bit transceiver blocks (Port A/B and Port C/D), each with dedicated nDIR (direction) and nOE (output enable) inputs referenced to VCC(A). Data paths are fully bidirectional: HIGH on nDIR enables transmission from nAn to nBn; LOW enables reverse flow. Bus-hold circuitry actively maintains valid logic states on floating A- or B-side inputs without external resistors.

IOFF circuitry disables outputs during partial power-down, preventing backflow current when either VCC(A) or VCC(B) is at GND. In suspend mode, both A and B outputs enter high-impedance OFF-state while bus-hold remains active on the powered side - ensuring deterministic behavior during power sequencing in multi-rail systems.

Key Specifications

Pinout & Package

TSSOP48 (SOT362-1) package: plastic thin shrink small outline, 48 leads, 6.1 mm body width, 0.5 mm pitch. RoHS-compliant, lead-free, and halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply translating transceiver applications.

Compared with SN74AVCH16T245DGGR and 74LVC16T245PW,118, the 74AVCH16T245EV,518 uniquely supports independent sub-1 V operation (down to 0.8 V), higher bus-hold current, and full suspend-mode isolation - making it the only option qualified for ultra-low-voltage SoC interconnects and asymmetric power-down architectures.

Availability

74AVCH16T245EV,518 is available at Aetrix Electronics and suitable for DDR memory interfaces, FPGA-to-MCU bridging, automotive ADAS domain controllers, and industrial PLC backplanes requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74AVCH16T245EV,518 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in consumer, industrial, and automotive markets.

The 74AVCH series targets low-voltage, high-speed digital interfacing - specifically engineered for mixed-supply systems requiring precise voltage translation, minimal power consumption, and robust signal integrity in space-constrained designs.

FAQ

Can 74AVCH16T245EV,518 translate between 0.8 V and 3.3 V simultaneously?

Yes. VCC(A) can be set to 0.8 V while VCC(B) operates at 3.3 V, enabling bidirectional translation between ultra-low-voltage logic and standard 3.3 V I/O. The device guarantees 380 Mbit/s data rate and maintains valid VIH/VIL thresholds per JEDEC JESD8-12 at 0.8 V, confirmed in Tables 5 and 7 of the datasheet.

What happens to outputs when VCC(A) = 0 V and VCC(B) = 3.3 V?

In this suspend condition, both A-side and B-side outputs enter high-impedance OFF-state (Z), regardless of nDIR/nOE states. Bus-hold remains active on the powered B-side, holding floating inputs at valid logic levels. IOFF leakage is limited to ±5 μA, preventing back-current into the unpowered A-side supply rail.

Is external termination required for 380 Mbit/s operation?

No external termination is required for basic functionality, but controlled-impedance PCB routing (e.g., 50 Ω traces) and load capacitance ≤15 pF are recommended to maintain signal integrity at 380 Mbit/s. Table 15 specifies test conditions using 2 kΩ RL and 15 pF CL; exceeding these values increases propagation delay and jitter.

How does bus-hold behave during voltage translation?

Bus-hold operates independently on each I/O bank: A-side inputs use VCC(A) as reference, B-side inputs use VCC(B). At 1.2 V supply, bus-hold sustains ±25 μA (Table 7), ensuring noise margins exceed 200 mV even with 10 cm unterminated traces - eliminating need for external biasing in most embedded applications.