Texas Instruments CY74FCT163646CPVCT

Overview

CY74FCT163646CPVCT from Texas Instruments is a 16-bit registered transceiver with dual 8-bit registers, 5.4 ns propagation delay at 3.3 V, 24 mA balanced output drive, and 5 V-tolerant I/O for mixed-voltage system interfacing. It operates across –40°C to +85°C and supports real-time or registered data transfer between two 16-bit buses in industrial control backplanes.

For engineers reviewing the CY74FCT163646CPVCT datasheet, CY74FCT163646CPVCT pinout, CY74FCT163646CPVCT application, or CY74FCT163646CPVCT equivalent, key selection criteria include its 24 mA drive strength, power-off disable capability for live insertion, edge-rate controlled outputs to reduce ground bounce, and support for both transparent and registered data paths via DIR, OE, CLKAB/CLKBA, and SAB/SBA controls.

Technical Context

The CY74FCT163646CPVCT implements two independent 8-bit D-type register banks (A and B), each with separate clock inputs (CLKAB for A→B, CLKBA for B→A) and direction-controlled three-state outputs. Its dual-register architecture enables simultaneous storage of data from either bus while maintaining isolation during OE HIGH.

It features 5 V-tolerant inputs/outputs compatible with TTL-level signaling, current-limiting output drivers eliminating need for external termination, and edge-rate control circuitry that limits di/dt to suppress switching noise and ground bounce-critical for high-density PCBs operating at >10 MHz toggle rates.

Key Specifications

Pinout & Package

Package: 56-pin SSOP (O56), 300-mil body width, JEDEC MO-118 compliant, 0.025-inch pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT163646CPVG4, CY74FCT163646CPVCT offers identical functionality but lacks Pb-free certification; versus 74ALVC163646PW, it provides essential 5 V I/O tolerance and industrial temperature support-making it irreplaceable in legacy backplane upgrades requiring robust mixed-voltage interoperability.

Availability

CY74FCT163646CPVCT is available at Aetrix Electronics and suitable for industrial backplane interface, telecom line card buffering, automotive diagnostic gateway, and test equipment data mux applications requiring stable component supply despite TI's OBSOLETE status.

Supply support for CY74FCT163646CPVCT 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 company delivering analog and embedded processing solutions, with leadership in logic, interface, and timing products since the 1960s.

The CY74FCT163646CPVCT belongs to TI's FCT-C logic family, designed specifically for high-speed, low-noise, mixed-voltage bus interfacing in industrial and telecom infrastructure where reliability under thermal stress and live-insertion capability are critical.

FAQ

What is the maximum clock frequency supported by the CY74FCT163646CPVCT in registered mode?

The CY74FCT163646CPVCT supports a minimum clock pulse width of 5.0 ns (HIGH or LOW), implying a theoretical maximum clock frequency of 100 MHz in registered mode. Real-world operation depends on board layout, load capacitance, and signal integrity-but the 5.4 ns propagation delay and <500 ps output skew ensure reliable operation up to 80 MHz in typical industrial backplane implementations using the CY74FCT163646CPVCT.

Does the CY74FCT163646CPVCT support true bidirectional data flow on the same bus pair?

No-the CY74FCT163646CPVCT does not support simultaneous bidirectional transfer on the same physical bus pair. Its architecture separates A and B ports: data flows unidirectionally from A to B or B to A based on DIR state, with OE controlling output enable. The function table confirms that real-time transfer occurs only in one direction per cycle, and storage from both buses requires OE HIGH (isolation mode). This design prevents bus contention and ensures deterministic timing in the CY74FCT163646CPVCT.

Can the CY74FCT163646CPVCT be used without external pull-up or pull-down resistors on control pins?

Yes-the CY74FCT163646CPVCT has CMOS-compatible inputs with ±1 µA leakage (IIH/IIL), and its DIR, OE, CLKAB, CLKBA, SAB, and SBA pins do not require external biasing for valid logic levels. However, for robust noise immunity in electrically noisy environments (e.g., industrial motor drives), TI recommends adding 10 kΩ pull-downs to OE and DIR when those signals originate from open-drain or high-impedance sources. This guidance applies specifically to the CY74FCT163646CPVCT and is confirmed in its functional description and DC characteristics table.

What is the purpose of the SAB and SBA pins on the CY74FCT163646CPVCT?

The SAB (Source A/B) and SBA (Source B/A) pins on the CY74FCT163646CPVCT select the data source for each output port: SAB determines whether A-port outputs deliver real-time B-bus data or stored B-register data; SBA selects between real-time A-bus or stored A-register data for B-port outputs. This multiplexing enables flexible data routing-such as forwarding live sensor data while holding configuration words in registers-without additional logic. The CY74FCT163646CPVCT uses these pins to decouple timing-critical transfers from register updates.

Is the CY74FCT163646CPVCT pin-compatible with earlier CY74FCT163646 variants like CPAC or CPVC?

Yes-the CY74FCT163646CPVCT shares identical pinout and electrical specifications with CY74FCT163646CPAC (TSSOP) and CY74FCT163646CPVC (SSOP); all use the same 56-pin footprint and function table. The only differences are package type (SSOP vs. TSSOP), thermal characteristics, and RoHS status. Therefore, the CY74FCT163646CPVCT can replace CPVC in existing SSOP layouts without PCB modification, though thermal derating may apply due to differing package dissipation.