Renesas 74FCT3245PGG8

Overview

74FCT3245PGG8 from Renesas Electronics (formerly IDT) is a 3.3V CMOS octal bidirectional transceiver with industrial temperature range (–40°C to +85°C), 7 ns max propagation delay, ±60 mA output drive, and QSOP-20 green package. It enables asynchronous bus communication between two 8-bit data paths using DIR and OE control pins, commonly used in backplane interface and level-shifting applications.

For engineers reviewing the 74FCT3245PGG8 datasheet, 74FCT3245PGG8 pinout, 74FCT3245PGG8 application, or 74FCT3245PGG8 equivalent, key selection criteria include bidirectional direction control, 3.3V-only operation with 2.7–3.6V extended range, rail-to-rail output swing, integrated current-limiting resistors for reduced ground bounce, and industrial-grade reliability without external termination.

Technical Context

The 74FCT3245PGG8 implements dual-bus transceivers using 0.5 µm CMOS technology with hysteresis-equipped inputs for noise immunity. Its DIR pin determines data flow direction (A→B or B→A), while active-low OE overrides DIR to place both ports in high-impedance state.

It features series current-limiting resistors on all outputs to suppress ground bounce and undershoot, enabling clean signal transitions at up to 10 MHz toggle rates. Output voltage levels meet TTL-compatible thresholds with VOH ≥ 2.4 V (IOH = –8 mA) and VOL ≤ 0.4 V (IOL = 24 mA) under VCC = 3.0 V.

Key Specifications

Pinout & Package

74FCT3245PGG8 is housed in a 20-pin QSOP (Quarter-size Small Outline Package), green RoHS-compliant, 0.65 mm pitch, body size 7.2 × 4.4 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bidirectional transceiver applications.

Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74FCT3245PGG8 delivers superior noise immunity via hysteresis and cleaner edge control via on-die resistors-critical for industrial backplanes where ground bounce and crosstalk must be minimized without layout overhead.

Availability

74FCT3245PGG8 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus level translation, modular I/O expansion, and high-density data acquisition front-ends requiring stable component supply across long production lifecycles.

Supply support for 74FCT3245PGG8 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC products for automotive, industrial, infrastructure, and IoT applications.

The 74FCT3245PGG8 belongs to Renesas' legacy IDT logic portfolio, designed specifically for robust, low-noise bidirectional bus interfacing in harsh industrial environments where reliability and signal integrity are non-negotiable.

FAQ

What is the maximum operating frequency supported by the 74FCT3245PGG8?

The 74FCT3245PGG8 does not specify a maximum clock frequency but supports reliable data toggling up to 10 MHz based on dynamic current measurements and propagation delay (7 ns max). Its performance is governed by system-level timing constraints including setup/hold margins and bus loading-not an internal clock domain. For sustained 8-bit parallel transfers, 74FCT3245PGG8 maintains timing integrity below 100 Mbps aggregate bandwidth.

Can the 74FCT3245PGG8 operate at 2.5V supply voltage?

No, the 74FCT3245PGG8 is specified only for VCC = 2.7 V to 3.6 V, with normal operation at 3.3 V ±0.3 V. Operation at 2.5 V falls outside its guaranteed electrical characteristics-parameters like VOH, VOL, tPD, and ICC are not characterized or warranted below 2.7 V. Using 2.5 V may result in marginal logic thresholds or increased propagation delay, so 74FCT3245PGG8 must be powered within its rated range.

Does the 74FCT3245PGG8 support hot-plug operation?

The 74FCT3245PGG8 supports hot-plug operation only when OE is held HIGH (high-impedance state) before and during insertion. Its absolute maximum ratings allow input voltages up to VCC + 0.5 V on I/O pins and –0.5 V to +7 V on dedicated inputs, enabling safe biasing during live backplane mating. However, no built-in hot-swap current limiting exists-external current-limiting resistors or sequencing controls are recommended for full compliance, as confirmed in 74FCT3245PGG8 functional testing.

What is the purpose of the hysteresis on the 74FCT3245PGG8 inputs?

The 150 mV input hysteresis on the 74FCT3245PGG8 increases noise immunity by creating distinct HIGH and LOW switching thresholds-preventing oscillation or metastability when input signals cross the logic threshold slowly or with superimposed noise. This feature is especially valuable on DIR and OE control lines in electrically noisy industrial settings, ensuring deterministic state transitions without external Schmitt triggers. All inputs, including A/B I/O pins, exhibit this hysteresis per 74FCT3245PGG8 datasheet specification.

Is the 74FCT3245PGG8 pin-compatible with the 74FCT3245A variant?

Yes, the 74FCT3245PGG8 and 74FCT3245A share identical pinout, package (QSOP-20), and DC/AC electrical specifications except for tighter propagation delay limits in the 'A' version (4.6 ns max vs. 7 ns max). Both use the same DIR/OE control architecture and support identical VCC ranges and thermal profiles. No PCB changes are required when substituting 74FCT3245PGG8 for 74FCT3245A in existing designs, though timing-critical systems should verify slack with the slower 74FCT3245PGG8 spec.