NXP Semiconductors 74LVT2952DB,112

Overview

74LVT2952DB,112 from NXP Semiconductors is a 3.3 V octal registered transceiver in SSOP24 package, featuring independent A/B bus registers, 3-state outputs, TTL-compatible I/O, and ±64 mA/−32 mA drive capability. It enables bidirectional data latching between two 8-bit buses in high-speed digital systems such as memory interfaces and bus isolation circuits.

For engineers reviewing the 74LVT2952DB,112 datasheet, 74LVT2952DB,112 pinout, 74LVT2952DB,112 application, or 74LVT2952DB,112 equivalent, key selection criteria include clocked register behavior, 5 V-tolerant inputs, bus-hold functionality, and propagation delays under 6.5 ns at 3.3 V.

Technical Context

The 74LVT2952DB,112 implements dual 8-bit edge-triggered D-type registers with separate clock (CPAB/CPBA), clock enable (CEAB/CEBA), and output enable (OEAB/OEBA) controls for each direction. Its BiCMOS architecture delivers low static power while sustaining 200 MHz maximum clock frequency and sub-7 ns propagation delays.

It supports live insertion/extraction and power-up 3-state behavior, with bus-hold circuitry eliminating external pull-ups on unused I/O pins. Input voltage tolerance up to 5.5 V allows interoperability with 5 V logic systems while operating from a 3.3 V supply.

Key Specifications

Pinout & Package

74LVT2952DB,112 uses the SSOP24 (SOT340-1) package: plastic shrink small outline, 24 leads, 5.3 mm body width, 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT2952DB,112, the 74LVT245DB,112 lacks clocked register storage and requires external timing control, while SN74LVC8T245RHLR omits 5 V input tolerance and uses a physically incompatible package-making 74LVT2952DB,112 uniquely suited for synchronized, mixed-voltage bus bridging in SSOP24 layouts.

Availability

74LVT2952DB,112 is available at Aetrix Electronics and suitable for memory interface buffering, processor bus isolation, FPGA I/O expansion, and legacy system interfacing requiring stable component supply and long-term industrial availability.

Supply support for 74LVT2952DB,112 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

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in high-performance logic and interface ICs.

The 74LVT2952DB,112 belongs to NXP's LVT (Low-Voltage TTL) family, designed specifically for high-speed, low-power bidirectional data transfer between mixed-voltage digital subsystems in industrial and communications equipment.

FAQ

What is the function of CEAB and CEBA pins on the 74LVT2952DB,112?

The CEAB (Clock Enable A-to-B) and CEBA (Clock Enable B-to-A) pins are active-LOW inputs that gate the respective CPAB and CPBA clock signals. When CEAB = LOW, rising edges on CPAB load data from A-side inputs into the A→B register; when CEAB = HIGH, the register holds its previous state regardless of CPAB activity. The same behavior applies to CEBA/CPBA for B→A data flow. This enables precise control over data capture timing without requiring clock gating at the system level, and is explicitly defined in Table 3 of the 74LVT2952DB,112 datasheet.

Does the 74LVT2952DB,112 support live insertion and extraction?

Yes, the 74LVT2952DB,112 supports live insertion and extraction as stated in Section 2 ("Features and benefits") of its datasheet. This capability is enabled by its power-up 3-state behavior and bus-hold circuitry, which prevent bus contention and maintain valid logic states during hot-swap events. The device remains electrically benign during partial power application, making it suitable for modular backplane and field-replaceable unit designs where the 74LVT2952DB,112 serves as a bus interface component.

What is the maximum output current specification for the 74LVT2952DB,112?

The 74LVT2952DB,112 specifies +64 mA source current (IOH) and −32 mA sink current (IOL) per output pin under recommended operating conditions. These values are confirmed in Section 2 ("Features and benefits") and Table 6 ("Recommended operating conditions") of the official NXP datasheet. This asymmetric drive strength is optimized for driving TTL loads and high-capacitance buses, and directly impacts design decisions involving fan-out, trace length, and termination in systems using the 74LVT2952DB,112.

Can the 74LVT2952DB,112 operate with a 2.5 V supply?

No, the 74LVT2952DB,112 is not rated for 2.5 V operation. Its recommended supply voltage range is strictly 2.7 V to 3.6 V, as specified in Table 6 of the datasheet. Operation below 2.7 V may result in degraded timing margins, increased propagation delay, unreliable register behavior, or failure to meet output voltage specifications (VOH/VOL). For 2.5 V systems, alternative families such as LVC or ALVC should be evaluated instead of the 74LVT2952DB,112.

How does bus-hold functionality work on the 74LVT2952DB,112?

The 74LVT2952DB,112 integrates bus-hold circuitry on all A0–A7 and B0–B7 I/O pins, with typical hold currents of ±75 µA to ±150 µA (Table 7). This feature actively maintains the last-valid logic state on floating inputs without external resistors. When an input voltage drifts toward the opposite logic threshold, the bus-hold circuit sources or sinks current to reinforce the existing state-ensuring noise immunity and deterministic behavior in unconnected or unterminated stubs. This is a verified characteristic of the 74LVT2952DB,112, not inferred or generalized.