Texas Instruments CY74FCT163245CPACT

Overview

CY74FCT163245CPACT from Texas Instruments is a 16-bit non-inverting bidirectional transceiver with 5V-tolerant inputs/outputs, 4.1 ns propagation delay (t_PLH/t_PHL), 24 mA balanced drive capability, and power-off high-impedance outputs. It operates across V_CC = 2.7 V to 3.6 V and –40°C to +85°C, enabling use in mixed-voltage bus translation between 3.3 V logic and legacy 5 V systems.

For engineers reviewing the CY74FCT163245CPACT datasheet, CY74FCT163245CPACT pinout, CY74FCT163245CPACT application, or CY74FCT163245CPACT equivalent, key selection considerations include its 48-pin TSSOP package, direction-controlled bidirectional data flow, live-insertion support via power-off disable, and compatibility with FCT-C speed grade timing requirements in industrial backplane and memory interface designs.

Technical Context

The CY74FCT163245CPACT implements dual 8-bit bidirectional data paths controlled by independent DIR and OE signals per port pair. Direction control is synchronous and level-sensitive: when OE is LOW, data flows from A-to-B if DIR is HIGH, or B-to-A if DIR is LOW - no internal latching or clocking is involved.

Its I/O structure features 5V-tolerant CMOS inputs and outputs with current-limited 24 mA drivers, edge-rate control circuitry to suppress ground bounce (<250 ps typical output skew), and IOFF functionality that forces outputs into high-Z when V_CC = 0 V - critical for hot-swap and partial-power-down system architectures.

Key Specifications

Pinout & Package

Package: 48-pin TSSOP (DGG), 240-mil body width, 0.5 mm pitch, JEDEC MO-153 compliant. Moisture Sensitivity Level (MSL) 1 - unlimited floor life at ≤30°C/60% RH.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245A and 74ALVC16245, the CY74FCT163245CPACT uniquely delivers full 5 V tolerance on both inputs and outputs within a single device, enabling true bidirectional mixed-voltage translation without external components - a requirement not met by either alternative in industrial backplane or memory subsystem designs.

Availability

CY74FCT163245CPACT is available at Aetrix Electronics and suitable for industrial control systems, FPGA-based prototyping platforms, and telecom infrastructure requiring stable component supply with long-term lifecycle assurance.

Supply support for CY74FCT163245CPACT 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CY74FCT163245CPACT belongs to TI's FCT logic family, engineered specifically for high-speed, low-noise bidirectional bus interfacing in mixed-voltage industrial and telecom systems - emphasizing robustness, timing precision, and power-aware operation.

FAQ

What is the maximum operating frequency supported by the CY74FCT163245CPACT?

The CY74FCT163245CPACT supports data rates up to approximately 240 MHz, derived from its 4.1 ns maximum propagation delay (t_PLH/t_PHL) under industrial conditions (V_CC = 3.0–3.6 V, T_A = –40°C to +85°C). This enables reliable use in high-speed memory buffers and FPGA I/O expansion where timing margins must accommodate worst-case voltage and temperature variation. The CY74FCT163245CPACT does not include internal clocks or PLLs - its frequency limit is determined solely by external signal slew rate and board-level timing constraints.

Does the CY74FCT163245CPACT support live insertion, and how is this implemented?

Yes, the CY74FCT163245CPACT supports live insertion through its IOFF (power-off disable) feature: when V_CC = 0 V, outputs enter a high-impedance state with leakage ≤ ±100 µA, preventing back-driving of powered bus segments. This behavior is guaranteed across the full industrial temperature range and is independent of DIR or OE states. The CY74FCT163245CPACT achieves this via internal circuitry that actively disables output drivers during undervoltage conditions - a key requirement for hot-swap telecom line cards and modular industrial controllers.

How does the CY74FCT163245CPACT differ from the CY74FCT163H245 variant?

The CY74FCT163245CPACT lacks bus-hold circuitry on its data inputs, unlike the CY74FCT163H245 which integrates bus-hold to retain last valid logic state during high-impedance input conditions. As a result, the CY74FCT163245CPACT requires external pull-up or pull-down resistors on unused or floating inputs to prevent metastability. This makes the CY74FCT163245CPACT preferable in applications where deterministic input biasing is required - such as FPGA configuration buses or test-access ports - whereas the CY74FCT163H245 suits systems needing reduced external component count on general-purpose I/O.

What package type and footprint does the CY74FCT163245CPACT use?

The CY74FCT163245CPACT uses a 48-pin TSSOP (Thin Shrunk Small Outline Package) with JEDEC MO-153 compliance, designated DGG package drawing, 0.5 mm lead pitch, and 12.6 mm × 6.1 mm body dimensions. Its gull-wing leads are compatible with standard SMT reflow profiles (MSL Level 1), and the pinout matches TI's Z48 ordering code designation. This package provides superior thermal performance and lower parasitic inductance compared to SSOP alternatives - critical for maintaining signal integrity in high-speed bidirectional bus applications using the CY74FCT163245CPACT.

Can the CY74FCT163245CPACT be used for level translation between 3.3 V and 5 V logic domains?

Yes, the CY74FCT163245CPACT is explicitly designed for bidirectional level translation: its inputs and outputs are 5 V tolerant while operating from a 2.7–3.6 V V_CC supply. This allows it to accept 5 V logic signals on either A or B ports and drive 5 V-compatible loads without external components. Unlike unidirectional translators, the CY74FCT163245CPACT maintains full timing symmetry in both directions - making it suitable for memory-mapped I/O, shared bus arbitration, and other applications where signal integrity and timing predictability across voltage domains are essential.