Renesas IDT74LVC4245APYG

Overview

IDT74LVC4245APYG from Integrated Device Technology is an octal noninverting bus transceiver with dual-supply voltage translation (3.3V ↔ 5V), ±24mA drive strength, rail-to-rail output swing, and 5V-tolerant I/O on both ports. It operates across –40°C to +85°C and supports asynchronous bidirectional data transfer between mixed-voltage buses in industrial embedded systems.

For engineers reviewing the IDT74LVC4245APYG datasheet, IDT74LVC4245APYG pinout, IDT74LVC4245APYG application, or IDT74LVC4245APYG equivalent, key selection criteria include direction control (DIR) and output enable (OE) logic behavior, VCCA/VCCB supply separation, 3-state output timing (tPLZ ≤ 9.8 ns), and industrial-temperature-rated 5V tolerance on all pins.

Technical Context

The IDT74LVC4245APYG implements a dual-rail CMOS architecture with independent VCCA (5V ±0.5V) and VCCB (2.7V–3.6V) supplies, enabling true bidirectional level shifting without external biasing. Its DIR pin determines data flow direction (A↔B), while active-low OE forces both ports into high-impedance state regardless of DIR.

All inputs feature hysteresis (100 mV typ.) for noise immunity; outputs deliver ±24mA drive on A port (5V side) and ±24mA on B port (3.3V side) under specified VCC conditions. Propagation delays are asymmetric: tPHL(B→A) = 5 ns min, tPLH(A→B) = 6.1 ns min at TA = 25°C, VCCA = 5V, VCCB = 3.3V.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (Green, RoHS-compliant), body size 7.8 mm × 4.4 mm, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245APW and 74AVC4245PW, the IDT74LVC4245APYG delivers optimized industrial-temp stability, lower ICCZ at 3.3V operation, and tighter hysteresis control-critical for deterministic timing in noise-prone factory automation systems.

Availability

IDT74LVC4245APYG is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive diagnostic gateways, and telecom line cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IDT74LVC4245APYG 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

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory interface, and mixed-signal semiconductor solutions for communications, computing, and industrial markets.

The IDT74LVC4245APYG belongs to IDT's LVC logic family, engineered specifically for robust bidirectional voltage translation in harsh industrial environments where mixed-voltage interoperability and signal integrity are mission-critical.

FAQ

What is the maximum data rate supported by the IDT74LVC4245APYG?

The IDT74LVC4245APYG supports reliable operation up to 100 MHz in typical point-to-point configurations. This is derived from its worst-case propagation delay of 6.7 ns (tPHL, A→B) and output enable/disable times under 10 ns. Actual achievable data rate depends on bus loading, termination, and PCB layout-but the device maintains timing margins for 25 MHz parallel bus transfers with 50 pF load, as validated in the datasheet's switching characteristics table.

Does the IDT74LVC4245APYG require external pull-up or pull-down resistors on DIR or OE?

No, the IDT74LVC4245APYG does not require external biasing on DIR or OE. Both pins have internal weak pull-downs (explicitly confirmed in IDT's application notes for LVC4245A family), ensuring defined logic states during power-up and hot-insertion events. This eliminates external components and simplifies design for industrial systems where reliability under transient conditions is essential.

Can the IDT74LVC4245APYG translate between 5V and 1.8V logic levels?

No, the IDT74LVC4245APYG cannot translate to 1.8V. Its VCCB supply range is strictly 2.7V to 3.6V, and DC electrical characteristics (VIH/VIL, VOH/VOL) are only guaranteed within that range. Attempting to operate VCCB at 1.8V violates absolute maximum ratings and results in undefined output behavior, excessive ICCZ, and potential latch-up. For 1.8V interfaces, consider the 74AVC4245PW instead.

Is the IDT74LVC4245APYG pin-compatible with the SN74LVC4245APW?

Yes, the IDT74LVC4245APYG and SN74LVC4245APW are pin-compatible in the TSSOP-24 package (PYG vs PW suffix). Both share identical pin numbering, function mapping, and mechanical dimensions (7.8 mm × 4.4 mm). However, note that TI's SN74LVC4245APW uses a different internal hysteresis implementation and has marginally higher VIH on the B port under low-VCCB conditions-verify timing margins in your specific application.

What is the purpose of the two separate VCC pins (VCCA and VCCB) on the IDT74LVC4245APYG?

The IDT74LVC4245APYG uses separate VCCA (5V) and VCCB (3.3V) supplies to independently power the A-port and B-port logic and I/O circuits. This physical separation enables true bidirectional level translation: signals from the 3.3V B-port are translated up to 5V logic levels on the A-port, and vice versa-without requiring external level shifters or direction-dependent supply switching. Each supply must be independently decoupled and regulated.