Texas Instruments CY74FCT163H245CPVC

Overview

CY74FCT163H245 from Texas Instruments is a 16-bit non-inverting bus transceiver with bus-hold inputs, designed for bidirectional synchronous data transfer between two 3.3V buses. It features 24 mA balanced drive outputs, 4.1 ns propagation delay (t_PLH/t_PHL), power-off high-impedance outputs, and operates across –40°C to +85°C industrial temperature range.

For engineers reviewing the CY74FCT163H245 datasheet, CY74FCT163H245 pinout, CY74FCT163H245 application, or CY74FCT163H245 equivalent, key selection considerations include bus-hold functionality eliminating external pull resistors, 5V-tolerant I/O compatibility in mixed-voltage systems, low ground bounce (<250 ps output skew), and SSOP-48 packaging for space-constrained board layouts.

Technical Context

This device implements dual 8-bit transceiver channels (A↔B) controlled by independent DIR and OE signals per side, enabling flexible bidirectional flow control in memory-mapped or peripheral interconnect applications. Each channel supports true three-state outputs with current-limiting drivers and edge-rate control circuitry to suppress switching noise.

The CY74FCT163H245 integrates bus-hold circuitry on all A- and B-side data inputs, retaining the last valid logic state during high-impedance conditions-eliminating floating inputs without external biasing. Its V_CC range of 2.7V–3.6V and 5V-tolerant I/O allow interoperability with legacy 5V TTL/CMOS while powering from modern 3.3V rails.

Key Specifications

Pinout & Package

Package: 48-pin SSOP (O48), 300-mil body width, JEDEC MO-118 compliant, lead-free (RoHS) finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245A and 74ALVC16245, the CY74FCT163H245 uniquely combines bus-hold, 5V-tolerant I/O, and power-off disable-making it irreplaceable in mixed-voltage, hot-plug, or resistor-free design contexts.

Availability

CY74FCT163H245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-memory interfaces, test equipment I/O modules, and embedded controller bus expansion requiring stable component supply and long-term lifecycle support.

Supply support for CY74FCT163H245 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 heritage in high-reliability interface and timing products.

The CY74FCT163H245 belongs to TI's FCT logic family-designed specifically for low-noise, high-speed 3.3V bus interfacing in industrial, telecom, and computing infrastructure where signal integrity and mixed-voltage compatibility are critical.

FAQ

What is the function of the DIR and OE pins on the CY74FCT163H245?

The CY74FCT163H245 uses two DIR pins (1DIR and 2DIR) and two OE pins (1OE and 2OE) to independently control direction and enable/disable for its dual 8-bit banks. When 1OE is LOW and 1DIR is LOW, data flows from Port B to Port A; when 1DIR is HIGH, data flows from Port A to Port B. Setting either OE HIGH places that bank's outputs in high-impedance state. This granular control allows flexible bus arbitration in complex multi-master systems.

Does the CY74FCT163H245 support live insertion, and how is this implemented?

Yes, the CY74FCT163H245 supports live insertion via its power-off disable feature. When V_CC = 0 V, the outputs enter a high-impedance state with leakage current ≤ ±100 µA (IOFF), preventing back-driving of powered buses. This behavior is guaranteed across the full industrial temperature range and is intrinsic to the device's output stage design-not dependent on external circuitry-making the CY74FCT163H245 suitable for hot-pluggable backplane applications.

How does the bus-hold feature on the CY74FCT163H245 eliminate external resistors?

The CY74FCT163H245 integrates active bus-hold circuitry on all 32 data I/O pins (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8). When an input floats, internal feedback sustains the last valid logic level using ±50 µA of holding current. This eliminates the need for discrete pull-up or pull-down resistors-reducing BOM cost, PCB area, and potential noise coupling-while ensuring deterministic logic states during signal transitions or disconnection events.

What is the maximum operating frequency supported by the CY74FCT163H245 in a data path?

The CY74FCT163H245 has a maximum propagation delay of 4.1 ns (t_PLH/t_PHL) under industrial conditions (V_CC = 3.0–3.6 V, T_A = –40°C to +85°C). This corresponds to a theoretical maximum toggle rate of approximately 240 MHz in a single-direction path. However, practical system-level bandwidth depends on bus loading, trace length, and timing margins-designers typically target ≤150 MHz for robust 16-bit parallel interfaces using the CY74FCT163H245.

Is the CY74FCT163H245 pin-compatible with the CY74FCT163245, and what are the key functional differences?

Yes, the CY74FCT163H245 is pin-compatible with the CY74FCT163245 in identical packages (SSOP-48 and TSSOP-48). The primary difference is bus-hold: the CY74FCT163H245 includes bus-hold on all data inputs, while the CY74FCT163245 does not. Both share identical timing, drive strength, 5V tolerance, and power-off disable. Therefore, the CY74FCT163H245 can directly replace the CY74FCT163245 where bus-hold is required-but not vice versa without adding external biasing.