Texas Instruments CY74FCT273ATQCT

Overview

CY74FCT273ATQCT from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with common clock (CP) and master-reset (MR) inputs, 7.2 ns maximum propagation delay, 64 mA sink / 32 mA source output drive, and I_off partial-power-down support. It operates across –40°C to +85°C and is used in synchronous data latching, bus interface buffering, and control-state storage in industrial logic systems.

For engineers reviewing the CY74FCT273ATQCT datasheet, CY74FCT273ATQCT pinout, CY74FCT273ATQCT application, or CY74FCT273ATQCT equivalent, key selection criteria include its QSOP-20 package, TTL-compatible input thresholds, matched rise/fall times, edge-rate controlled noise immunity, and compatibility with FCT-family timing and drive specifications.

Technical Context

This device implements eight independent D-type flip-flops sharing a single buffered clock and asynchronous master-reset. Each flip-flop captures the state of its D input one setup time before the low-to-high CP transition and holds it until the next valid clock edge or MR assertion.

It features I_off circuitry that disables outputs when V_CC = 0 V, preventing backflow current during partial power-down. Its edge-rate control architecture reduces simultaneous switching noise, and its input hysteresis (0.2 V) improves noise margin against slow or noisy signals.

Key Specifications

Pinout & Package

Package: SSOP-20 (DBQ), 0.65 mm pitch, body size 7.2 × 5.3 mm, moisture sensitivity level 2 (260°C reflow, 1 year floor life).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit register applications.

Compared with CY74FCT273ATQCT, CY74FCT273ATSOCT trades compactness for ease of assembly and slightly better thermal performance, while SN74FCT273ATQCT offers identical functionality under TI's standard naming-making it a drop-in alternative with no design or layout impact.

Availability

CY74FCT273ATQCT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface buffering, and motor control state registration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY74FCT273ATQCT 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, automotive, and communications markets.

The CY74FCT273ATQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible interfacing in industrial control and instrumentation systems where reliability and signal integrity are critical.

FAQ

What is the maximum clock frequency supported by CY74FCT273ATQCT?

CY74FCT273ATQCT has a maximum propagation delay of 7.2 ns, supporting reliable operation up to approximately 100 MHz in well-designed systems with adequate setup/hold margins. The actual usable frequency depends on board layout, load capacitance, and timing closure with surrounding logic; the device itself does not specify a hard maximum clock rate but guarantees timing parameters down to 7.2 ns t_PD and 2 ns t_su/t_h.

Does CY74FCT273ATQCT support hot-swap or partial-power-down operation?

Yes, CY74FCT273ATQCT includes I_off circuitry that disables outputs when V_CC = 0 V, limiting leakage to ±1 µA. This allows safe insertion into live backplanes or operation in multi-rail systems where other supplies remain active, making CY74FCT273ATQCT suitable for hot-swap-capable industrial modules and modular test equipment.

What is the pin 1 orientation for CY74FCT273ATQCT in tape-and-reel packaging?

CY74FCT273ATQCT is supplied in SSOP-20 (DBQ) tape-and-reel format with pin 1 located in quadrant Q1 per JEDEC standards. The carrier tape uses 8.0 mm pitch and 16.4 mm reel width, and the device marking "FCT273A" appears on the top surface adjacent to pin 1 for visual verification during automated placement.

How does CY74FCT273ATQCT differ from the 'C' and 'T' speed grades in the same family?

CY74FCT273ATQCT is the 'A' speed grade (7.2 ns max t_PD), positioned between the faster 'C' grade (5.8 ns) and slower 'T' grade (13 ns). All share identical pinout, I_off, noise control, and drive strength, but 'A' offers optimal balance of speed and power for industrial logic where extreme frequency isn't required but deterministic timing is essential - unlike CY74FCT273ATQCT, the 'C' grade consumes more dynamic current at high frequencies.

Can CY74FCT273ATQCT drive standard TTL loads directly?

Yes, CY74FCT273ATQCT is fully TTL-compatible: its inputs accept standard TTL voltage thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), and its outputs deliver 64 mA sink / 32 mA source - sufficient to drive up to 10 standard TTL unit loads (UL) per output. No external pull-ups or level shifters are needed when interfacing with legacy 5 V TTL devices, confirming CY74FCT273ATQCT's role as a drop-in logic interface component.