Texas Instruments SN74LVCZ240AN

Overview

SN74LVCZ240AN from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 2.7-V to 3.6-V VCC operation. It features two independent 4-bit channels, separate output-enable (1OE and 2OE) controls, 5.5-V-tolerant inputs, 6.5-ns max propagation delay at 3.3 V, and Ioff support for hot insertion-used in memory address buffering, clock distribution, and mixed-voltage bus interfacing.

For engineers reviewing the SN74LVCZ240AN datasheet, SN74LVCZ240AN pinout, SN74LVCZ240AN application, or SN74LVCZ240AN equivalent, key selection criteria include 3-state timing (ten/tdis), 5-V input compatibility with 3.3-V supply, ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2 V) performance, and thermal impedance (69°C/W for PDIP package).

Technical Context

The SN74LVCZ240AN implements dual 4-bit noninverting buffers with independent 3-state control per group. Each channel passes data from A inputs to Y outputs when its OE is low; outputs enter high-impedance state when OE is high. Input logic thresholds are referenced to VCC (VIH = 2 V min, VIL = 0.8 V max at 2.7–3.6 V), enabling reliable interfacing across 3.3-V and 5-V domains.

Its Ioff circuitry disables outputs during power-down to prevent backflow current, while power-up 3-state ensures outputs remain high-Z until VCC exceeds 1.5 V. Latch-up immunity (>100 mA per JESD 78 Class II) and ESD protection (2000-V HBM, 200-V MM, 1000-V CDM) support robust operation in industrial and hot-swap environments.

Key Specifications

Pinout & Package

SN74LVCZ240AN uses a 20-pin plastic dual in-line package (PDIP-N), 6.35 mm pitch, 24.2 mm body length, 6.35 mm width, and 4.57 mm max height per JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer/driver applications.

Compared with SN74LVCZ240AN, SN74LVC240APW offers identical functionality in a smaller footprint but requires SMT capability, while SN74LVCH240APW adds bus-hold for input robustness at minor capacitive cost-neither is pin-compatible with the PDIP package of SN74LVCZ240AN.

Availability

SN74LVCZ240AN is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and mixed-voltage bus interfacing requiring stable component supply, long-term industrial availability, and through-hole assembly compatibility.

Supply support for SN74LVCZ240AN 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, power management, and signal chain technologies.

The SN74LVCZ240AN belongs to TI's LVCZ advanced low-voltage CMOS logic family, engineered specifically to improve density and performance of 3-state memory address drivers, clock drivers, and bus-oriented transceivers in 3.3-V systems.

FAQ

What is the maximum input voltage rating for SN74LVCZ240AN?

The SN74LVCZ240AN accepts input voltages up to 5.5 V regardless of VCC level, enabling direct interfacing with 5-V logic families while operating from a 3.3-V supply. This specification is guaranteed across the full operating temperature range (–40°C to 85°C) and is validated per absolute maximum ratings in the official datasheet SCES273H.

Does SN74LVCZ240AN support hot insertion?

Yes, SN74LVCZ240AN supports hot insertion via integrated Ioff and power-up 3-state circuitry. When unpowered, Ioff disables outputs to block damaging backflow current; during power-up/down, outputs remain in high-impedance state until VCC exceeds 1.5 V. These features are explicitly verified per JESD 78 Class II latch-up and JESD 22 ESD standards.

What is the propagation delay of SN74LVCZ240AN at 3.3 V?

The maximum propagation delay (tpd) of SN74LVCZ240AN is 6.5 ns at VCC = 3.3 V and TA = 25°C, measured from input transition to output crossing VCC/2. This value is specified under standard load conditions (CL = 30 pF) and applies to both rising and falling edges per the switching characteristics table in SCES273H.

Can SN74LVCZ240AN be used in mixed 3.3-V and 5-V systems?

Yes, SN74LVCZ240AN is explicitly designed for mixed-mode operation: its inputs tolerate 0–5.5 V, allowing connection to 5-V drivers, while its outputs swing rail-to-rail between GND and VCC (2.7–3.6 V). This enables bidirectional voltage translation without external components, as confirmed in the device description and functional specifications of SCES273H.

What package type does SN74LVCZ240AN use?

SN74LVCZ240AN uses a 20-pin plastic dual in-line package (PDIP-N) per JEDEC MS-001, with 2.54-mm lead pitch, 24.2-mm body length, 6.35-mm body width, and 4.57-mm maximum height. Pin 1 identifier is a molded notch; the package is RoHS-compliant and rated for –40°C to 85°C operation.