Texas Instruments CY74FCT16245ATPACT

Overview

CY74FCT16245ATPACT from Texas Instruments is a 16-bit non-inverting bus transceiver with direction control (DIR) and three-state output enable (OE), designed for bidirectional synchronous communication between two buses. It delivers 64 mA sink / 32 mA source drive capability, supports partial-power-down via I_off, operates at 5V ±10%, and achieves 4.5 ns max propagation delay (A↔B) over –40°C to +85°C - ideal for high-capacitance backplane driving in industrial control systems.

For engineers reviewing the CY74FCT16245ATPACT datasheet, CY74FCT16245ATPACT pinout, CY74FCT16245ATPACT application, or CY74FCT16245ATPACT equivalent, key selection criteria include its 48-pin TSSOP package, 4.5 ns speed grade, I_off-enabled power-down safety, ground-bounce-limited VOLP <1.0 V, and compatibility with TTL/CMOS logic levels in noise-sensitive data-path isolation.

Technical Context

This device implements dual 8-bit transceiver blocks (1A/1B and 2A/2B), each controlled independently by dedicated DIR and OE pins. Data flow direction is determined solely by DIR state: LOW enables B→A transfer, HIGH enables A→B transfer, while OE=HIGH forces all outputs into high-impedance isolation.

The CY74FCT16245ATPACT uses FCT logic family architecture with edge-rate-controlled outputs to minimize switching noise and ground bounce. Its I_off circuitry actively disables outputs when V_CC = 0 V, preventing backflow current during partial power-down - a critical requirement for hot-swap and mixed-voltage system designs.

Key Specifications

Pinout & Package

Package: 48-pin TSSOP (DGG), 19.6-mil pitch, 12.6 mm × 6.2 mm × 1.2 mm max height, JEDEC MO-153 compliant. Pin 1 marked with corner chamfer; gage plane defined per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit transceiver applications.

Compared with CY74FCT16245CTPACT, the CY74FCT16245ATPACT trades 0.4 ns of speed margin for broader availability and cost efficiency; versus CY74FCT162245ATPACT, it offers higher sink current for legacy load compatibility but less noise optimization for high-speed interconnects.

Availability

CY74FCT16245ATPACT is available at Aetrix Electronics and suitable for industrial backplane interfaces, programmable logic controller (PLC) I/O expansion, and automated test equipment (ATE) signal routing requiring stable component supply across extended product lifecycles.

Supply support for CY74FCT16245ATPACT 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 specializing in analog, embedded processing, and logic solutions, with decades of experience in industrial-grade interface ICs.

The CY74FCT16245ATPACT belongs to TI's FCT logic family, engineered specifically for high-reliability, noise-resilient bidirectional bus interfacing in industrial automation and infrastructure equipment.

FAQ

What is the maximum operating frequency supported by CY74FCT16245ATPACT?

CY74FCT16245ATPACT does not specify a maximum clock frequency directly, but its 4.5 ns max propagation delay and 5.0 ns max output enable/disable times allow reliable use in bus systems with cycle times ≥10 ns - corresponding to effective data rates up to 100 MHz for synchronous transfers. Actual achievable frequency depends on trace length, loading, and system-level timing margins.

Does CY74FCT16245ATPACT support mixed-voltage operation between 3.3V and 5V domains?

CY74FCT16245ATPACT is a 5V-only device with TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V) and 5V ±10% supply requirement. It does not support 3.3V I/O directly; interfacing with 3.3V logic requires external level-shifting circuitry or a dual-supply transceiver such as the TXB0304.

How does the I_off feature protect CY74FCT16245ATPACT during partial power-down?

The I_off circuitry in CY74FCT16245ATPACT automatically disables all outputs when V_CC drops to 0 V, blocking current flow from live bus lines (e.g., 5V A/B ports) into the unpowered IC. This prevents latch-up, overheating, and damage during hot-swap or staggered power sequencing - a key requirement for modular industrial systems.

Can CY74FCT16245ATPACT be used as two independent 8-bit transceivers?

Yes - CY74FCT16245ATPACT contains two fully independent 8-bit transceiver sections (1A/1B and 2A/2B), each with dedicated DIR and OE controls. This allows simultaneous bidirectional data transfer between different bus pairs, such as isolating memory and peripheral interfaces within a single controller design.

What is the thermal performance of CY74FCT16245ATPACT in continuous operation?

CY74FCT16245ATPACT has a maximum power dissipation rating of 1.0 W and operates across –40°C to +85°C ambient. Under typical conditions (V_CC = 5 V, 50% toggle rate, one bit switching), total supply current remains below 1.5 mA - resulting in negligible self-heating. For high-density layouts, maintaining ≥1 mm clearance around the TSSOP body ensures adequate convection cooling.