NXP Semiconductors 74AVCH20T245DGV:11

Overview

74AVCH20T245DGV:11 from Nexperia is a 20-bit dual-supply voltage-level translating transceiver with independent VCC(A) and VCC(B) rails (0.8 V to 3.6 V), enabling bidirectional translation between mismatched logic domains such as 1.2 V ↔ 3.3 V or 1.8 V ↔ 2.5 V. It features two 10-bit I/O ports (1A/1B and 2A/2B), active bus hold, IOFF partial power-down, and operates across −40 °C to +125 °C - used in mixed-voltage SoC interconnects, FPGA I/O bridging, and industrial controller backplanes.

For engineers reviewing the 74AVCH20T245DGV:11 datasheet, 74AVCH20T245DGV:11 pinout, 74AVCH20T245DGV:11 application, or 74AVCH20T245DGV:11 equivalent, this page delivers verified electrical specs, TSSOP56 package mapping, suspend-mode behavior, bus-hold current values, and real-world translation timing data per JEDEC-compliant voltage combinations.

Technical Context

The 74AVCH20T245DGV:11 implements dual-rail CMOS transceiver architecture with separate input-referenced control logic (nDIR/nOE tied to VCC(A)) and output-referenced I/O banks (1B/2B referenced to VCC(B)). Its IOFF circuitry disables outputs and blocks backflow current when either supply drops to GND, enforcing safe partial power-down during system sleep states.

Bus hold circuitry actively sustains unused inputs at valid logic levels without external resistors - with confirmed IBHL ≥15 µA and IBHH ≤−15 µA at 1.4 V, eliminating floating node risks in high-impedance configurations. Translation direction is controlled per port via dedicated nDIR pins, supporting independent A→B or B→A flow on each 10-bit channel.

Key Specifications

Pinout & Package

TSSOP56 package (SOT481-2), 4.4 mm body width, 56-pin plastic thin shrink small outline; requires all GND pins (4, 11, 18, 25, 32, 39, 46, 53) to be connected to ground plane for signal integrity and thermal stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage translation applications.

Compared with SN74AVCH20T245RHLR and TXS0202DCUR, the 74AVCH20T245DGV:11 provides deterministic bidirectional control via explicit DIR/OE pins, full 20-bit parallel operation, and JEDEC-compliant timing - making it the sole option for high-speed synchronous memory and processor interconnects requiring guaranteed tpd and tdis.

Availability

74AVCH20T245DGV:11 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ECU gateways, FPGA-to-memory interfaces, and server memory subsystems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 74AVCH20T245DGV:11 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 leader in high-performance discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The 74AVCH20T245DGV:11 belongs to Nexperia's Advanced Voltage CMOS (AVC) logic family, engineered specifically for low-voltage, high-speed bidirectional level translation in mixed-domain digital systems where power efficiency and timing predictability are critical.

FAQ

What is the maximum allowable voltage difference between VCC(A) and VCC(B) for reliable operation of the 74AVCH20T245DGV:11?

The 74AVCH20T245DGV:11 supports any combination within 0.8 V to 3.6 V per rail - including 0.8 V vs. 3.6 V (2.8 V difference). Absolute maximum ratings allow VCC(A) and VCC(B) to differ up to 4.1 V (−0.5 V to +4.6 V), but recommended operation limits both to 0.8 V–3.6 V. The 74AVCH20T245DGV:11 maintains full functionality and timing spec compliance across the entire range without derating.

Does the 74AVCH20T245DGV:11 require external pull-up or pull-down resistors on its I/O pins?

No. The 74AVCH20T245DGV:11 integrates active bus hold circuitry on all 20 I/O pins (1A1–1A10, 1B1–1B10, 2A1–2A10, 2B1–2B10), providing sufficient sink/source current (≥15 µA / ≤−15 µA at 1.4 V) to maintain valid logic states on un-driven lines. This eliminates external biasing components, reducing BOM cost and PCB area. The 74AVCH20T245DGV:11 achieves full bus-hold compliance per JEDEC JESD8-12.

How does the 74AVCH20T245DGV:11 behave when only VCC(A) is powered and VCC(B) is grounded?

When VCC(B) = GND and VCC(A) is active, the 74AVCH20T245DGV:11 enters suspend mode: all B-side outputs (1B1–1B10, 2B1–2B10) go high-impedance, IOFF circuitry blocks reverse current, and bus hold remains active on the powered A-side. The 74AVCH20T245DGV:11 draws <5 µA total supply current in this state, satisfying low-power system wake-up requirements.

Can the 74AVCH20T245DGV:11 translate between 1.1 V and 1.2 V logic domains while maintaining timing specifications?

Yes. The 74AVCH20T245DGV:11 is characterized for 1.1 V to 1.2 V translation with 120 Mbit/s max data rate and 9.4 ns max propagation delay (−40 °C to +85 °C). Input thresholds scale with VCC(A), and static parameters (VIH/VIL) are guaranteed across overlapping JEDEC voltage classes (JESD8-11 and JESD8-12). The 74AVCH20T245DGV:11 meets all timing specs without derating in this configuration.

Is the 74AVCH20T245DGV:11 pin-compatible with other members of the 74AVCH20T245 family such as the DGG variant?

Yes. The 74AVCH20T245DGV:11 (SOT481-2, TSSOP56, 4.4 mm body) shares identical pinout, electrical characteristics, and functional behavior with the 74AVCH20T245DGG (SOT364-1, TSSOP56, 6.1 mm body). Both use the same 56-pin mapping per Table 2 of the datasheet. Mechanical differences affect PCB land pattern only - no schematic or firmware changes are needed when substituting the 74AVCH20T245DGV:11 for DGG in existing designs.