Texas Instruments CY74FCT2541TQCTG4

Overview

CY74FCT2541TQCTG4 from Texas Instruments is an octal 3-state noninverting buffer/line driver with 25-Ω output series resistors, designed for memory address driving, clock distribution, and bus transceiver applications in 5-V TTL/CMOS systems. It features I_off partial-power-down support, matched rise/fall times (1.5–8 ns), 12-mA sink / 15-mA source drive strength, and reduced transmission-line reflection noise.

For engineers reviewing the CY74FCT2541TQCTG4 datasheet, CY74FCT2541TQCTG4 pinout, CY74FCT2541TQCTG4 application, or CY74FCT2541TQCTG4 equivalent, key selection criteria include its 20-pin SSOP (DBQ) package, 8 ns max propagation delay (t_PLH/t_PHL), 25-Ω integrated output termination, I_off protection at V_CC = 0 V, and compatibility with TTL input logic levels.

Technical Context

The CY74FCT2541TQCTG4 implements dual 3-state enable control (OEA and OEB) to independently gate eight noninverting outputs, supporting bidirectional bus operation and flexible signal routing. Its edge-rate control circuitry shapes output transitions to suppress ringing without external components, while on-die 25-Ω series resistors damp reflections on PCB traces up to 15 cm.

This device operates within 4.75–5.25 V supply range and maintains full TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_VIH ≥ 2.0 V) and output swing (V_OL ≤ 0.55 V at 12 mA, V_OH ≥ 2.4 V at –15 mA). The I_off feature disables outputs and limits reverse current to ±1 µA when V_CC = 0 V, enabling safe hot-insertion and partial power-down in mixed-supply systems.

Key Specifications

Pinout & Package

Package: 20-pin SSOP (DBQ), 0.65-mm pitch, 7.4–7.6 mm width, 12.6–13.0 mm length, 2.65 mm max height per JEDEC MS-013.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with CY74FCT2541ATQCT and SN74FCT2541CTSOCT, the CY74FCT2541TQCTG4 offers the longest propagation delay but retains identical I_off, termination, and voltage specs - making it optimal for cost-sensitive industrial designs where 8 ns timing margin is sufficient and SSOP packaging is preferred for density.

Availability

CY74FCT2541TQCTG4 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, and clock distribution networks requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant SSOP packaging.

Supply support for CY74FCT2541TQCTG4 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 CY74FCT2541TQCTG4 belongs to TI's FCT logic family, engineered for noise-immune 5-V digital interfacing in harsh industrial environments where signal integrity and power-down safety are critical.

FAQ

What is the maximum operating frequency supported by CY74FCT2541TQCTG4?

The CY74FCT2541TQCTG4 does not specify a maximum clock frequency in its datasheet; instead, it defines propagation delays (1.5–8 ns) and transition times. For reliable operation, system timing must satisfy setup/hold requirements using worst-case t_PLH/t_PHL = 8 ns and t_PZL/t_PZH = 10 ns. In practice, CY74FCT2541TQCTG4 supports clean signal transmission up to approximately 125 MHz on well-terminated traces.

Does CY74FCT2541TQCTG4 require external pull-up or pull-down resistors on its enable pins?

No. The CY74FCT2541TQCTG4 has TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_VIH ≥ 2.0 V), so OEA and OEB can be driven directly from standard logic outputs. However, per TI's recommended operating conditions, all unused inputs-including OEA and OEB-must be tied to V_CC or GND to prevent floating states and ensure predictable 3-state behavior.

Can CY74FCT2541TQCTG4 interface directly with 3.3-V CMOS logic?

Yes - the CY74FCT2541TQCTG4 accepts 3.3-V logic-high inputs safely: its V_VIH min is 2.0 V, and absolute max input voltage is 7 V. However, its outputs swing to 5-V TTL levels (V_OH ≥ 2.4 V at –15 mA), so direct connection to 3.3-V CMOS inputs requires verification of the receiving device's 5-V-tolerant input specification or use of a level translator if not supported.

What is the thermal resistance (θ_JA) of the CY74FCT2541TQCTG4 in its SSOP package?

The CY74FCT2541TQCTG4 uses the DBQ (SSOP-20) package, which has a specified junction-to-ambient thermal resistance (θ_JA) of 68°C/W under standard JEDEC test conditions. This value assumes a two-layer PCB with minimal copper; actual performance improves with added thermal vias and ground/power planes.

Is CY74FCT2541TQCTG4 pin-compatible with CY74FCT541T?

Yes - the CY74FCT2541TQCTG4 is explicitly described in its datasheet as "function and pinout compatible with FCT and F Logic", and specifically states it "can replace the CY74FCT541T to reduce noise in an existing design." Both share identical 20-pin SSOP/SOIC pin assignments, electrical interface, and 3-state control architecture.