Texas Instruments SN74ALVCH162374DLR

Overview

SN74ALVCH162374DLR from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features bus-hold circuitry on data inputs, integrated 26-Ω series output resistors, and dual 8-bit or single 16-bit configuration capability. It is used in I/O port buffering, bidirectional bus driving, and working register applications in industrial and embedded digital systems.

For engineers reviewing the SN74ALVCH162374DLR datasheet, SN74ALVCH162374DLR pinout, SN74ALVCH162374DLR application, or SN74ALVCH162374DLR equivalent, key selection criteria include its wide V_CC range (1.65–3.6 V), 150-MHz maximum clock frequency, bus-hold input retention, 3-state output control per group, and SSOP-48 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D-type flip-flop banks, each with dedicated clock (1CLK/2CLK) and output-enable (1OE/2OE) controls. Data propagation occurs on the rising edge of CLK, with setup time as low as 1.9 ns (at V_CC = 2.7 V) and hold time down to 0.5 ns.

Each output supports 3-state operation with ±12 mA drive strength and built-in 26-Ω series termination to suppress overshoot/undershoot. Bus-hold circuitry actively maintains valid logic states on undriven D inputs without external resistors, eliminating floating-input risk in hot-swap or partial-bus scenarios.

Key Specifications

Pinout & Package

SN74ALVCH162374DLR is housed in a 48-pin SSOP (DL) package measuring 12.6 mm × 6.2 mm × 2.4 mm (max height), with 0.5-mm lead pitch and RoHS-compliant NiPdAu finish. The package is moisture-sensitive Level-1 (260°C peak reflow) and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit D-type flip-flop applications.

Compared with SN74LVC16374ADLR and 74AVC16374DGGR, SN74ALVCH162374DLR uniquely combines bus-hold, integrated output termination, and 150-MHz performance in a single SSOP-48 package - making it optimal for space-constrained, noise-sensitive I/O buffer applications without design compromises.

Availability

SN74ALVCH162374DLR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control module I/O expansion, and test equipment digital pattern generators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ALVCH162374DLR 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 expertise in high-reliability interface and timing ICs.

The SN74ALVCH162374DLR belongs to TI's Widebus™ family of advanced logic devices, engineered specifically for high-speed, low-voltage, bus-interface applications demanding robust signal integrity and minimal external component count.

FAQ

What is the recommended power-up sequence for SN74ALVCH162374DLR to ensure reliable 3-state initialization?

To guarantee high-impedance outputs at power-up, tie both 1OE and 2OE to V_CC through a pullup resistor (minimum value determined by driver sink capability). This prevents bus contention during V_CC ramp-up. The SN74ALVCH162374DLR does not require specific sequencing between V_CC and OE, but OE must be high before CLK becomes active. Internal bus-hold circuitry stabilizes D inputs independently of OE state.

Does SN74ALVCH162374DLR support mixed-voltage operation where D inputs are driven at 1.8 V while V_CC is 3.3 V?

Yes. SN74ALVCH162374DLR accepts input voltages from 0 V to V_CC, and its VIH/VIL thresholds scale with V_CC (e.g., VIH = 0.65×V_CC at 1.65 V). At V_CC = 3.3 V, a 1.8-V input exceeds the 2.0-V minimum VIH, ensuring reliable logic-high recognition. No level-shifting circuitry is needed for this common mixed-supply scenario.

Can SN74ALVCH162374DLR be used as a single 16-bit register, and how are the clock and enable signals configured?

Yes. SN74ALVCH162374DLR can operate as one 16-bit register by tying 1CLK and 2CLK together, and connecting 1OE and 2OE to the same control line. All 16 D inputs (1D1–1D8, 2D1–2D8) are sampled simultaneously on the rising clock edge, and all 16 Q outputs update in unison. This configuration preserves full 16-bit coherence with matched propagation delays across channels.

What is the maximum capacitive load SN74ALVCH162374DLR can drive while maintaining specified timing parameters?

Timing specifications (t_su, t_h, t_pd) in the SN74ALVCH162374DLR datasheet are characterized with CL = 30 pF (V_CC = 2.5 V) or 50 pF (V_CC = 3.3 V). Driving loads beyond 50 pF increases propagation delay and may violate setup/hold windows at 150 MHz. For >50-pF nets, use the integrated 26-Ω series resistor in conjunction with controlled-impedance routing to maintain signal integrity.

How does the bus-hold feature of SN74ALVCH162374DLR interact with externally pulled inputs?

TI explicitly advises against using external pullup/pulldown resistors with SN74ALVCH162374DLR's bus-hold inputs. The internal circuitry provides ~50-µA weak hold current; adding external resistors creates conflicting bias paths, potentially causing excessive current draw or logic instability. Bus-hold alone suffices for floating-input prevention - no external components are needed or recommended.