Texas Instruments SN74AHC16374DLG4

Overview

SN74AHC16374DLG4 from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs in a 48-pin SSOP (DL) package, operating from 2 V to 5.5 V, featuring ±25 mA output drive, 110 MHz max clock frequency at 5 V, and distributed V_CC/GND pins for noise reduction. It serves as a bus-interface register in high-speed digital systems requiring bidirectional data latching and bus isolation.

For engineers reviewing the SN74AHC16374DLG4 datasheet, SN74AHC16374DLG4 pinout, SN74AHC16374DLG4 application, or SN74AHC16374DLG4 equivalent, key selection considerations include its dual 8-bit latch architecture, 3-state enable timing (t_PZH/t_PLZ ≤ 10.5 ns at 5 V), flow-through pinout for PCB layout optimization, and compatibility with 3.3 V/5 V mixed-signal buses.

Technical Context

The SN74AHC16374DLG4 implements two independent 8-bit positive-edge-triggered D flip-flops sharing separate clock (1CLK/2CLK) and output-enable (1OE/2OE) controls. Each section latches D inputs on CLK↑ and drives Q outputs with rail-to-rail CMOS logic levels while supporting high-impedance tri-state operation via OE.

Its EPIC™ process enables low dynamic power (C_pd = 32 pF), latch-up immunity >250 mA per JESD 17, and ESD protection >2 kV HBM. The flow-through architecture places inputs on one side and outputs on the opposite side of the 48-pin DL package, minimizing trace crossovers in dense bus routing.

Key Specifications

Pinout & Package

SN74AHC16374DLG4 uses a 48-pin Plastic Shrink Small-Outline Package (SSOP, DL) with 0.5 mm pitch, 12.4 mm × 6.2 mm body, and 1.2 mm max height. Pin 1 is located at top-left corner (Q1 quadrant), with gage plane defined per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus register applications.

Compared with SN74AHC16373DLR and 74LVCH16374ADGG, the SN74AHC16374DLG4 uniquely balances 2–5.5 V operation, edge-triggered reliability, and SSOP-48 compatibility - making it optimal for legacy 5 V industrial designs requiring upgrade path flexibility.

Availability

SN74AHC16374DLG4 is available at Aetrix Electronics and suitable for industrial I/O expansion, memory interface buffering, high-speed test equipment bus, and automotive diagnostic interface requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for SN74AHC16374DLG4 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 over 90 years of innovation in high-reliability digital interfaces and timing products.

The SN74AHC16374DLG4 belongs to TI's Widebus™ family of high-speed bus interface ICs, designed specifically for noise-immune, high-density PCB layouts in industrial automation, test instrumentation, and automotive electronics.

FAQ

What is the maximum clock frequency supported by the SN74AHC16374DLG4?

The SN74AHC16374DLG4 supports a maximum clock frequency of 110 MHz when operated at V_CC = 5 V with a 15-pF load. At 50-pF load, f_max drops to 75 MHz. These values are specified in the switching characteristics table of the official datasheet (SCLS330G, Rev. January 2000) and reflect guaranteed performance across the full operating temperature range (–40°C to 85°C). The SN74AHC16374DLG4 achieves this speed through its EPIC™ CMOS process and optimized internal gate design.

Does the SN74AHC16374DLG4 support mixed-voltage operation between 3.3 V and 5 V domains?

Yes, the SN74AHC16374DLG4 supports true mixed-voltage operation: its 2-V to 5.5-V V_CC range allows direct interfacing with both 3.3 V and 5 V logic families. Input thresholds scale with V_CC (e.g., V_IH = 2.1 V at 3 V), and outputs swing rail-to-rail. When used as a bus translator, external level-shifting is unnecessary - but care must be taken to ensure all inputs remain within absolute max ratings (–0.5 V to V_CC + 0.5 V). The SN74AHC16374DLG4 maintains full timing compliance across this range.

How does the flow-through pinout of the SN74AHC16374DLG4 improve PCB layout?

The SN74AHC16374DLG4 features a flow-through pinout where all 16 D inputs occupy pins 1–8 and 25–32 on the left side, and all 16 Q outputs occupy pins 13–20 and 33–40 on the right side - enabling straight-line bus routing without layer changes or vias. This architecture reduces trace length mismatch, minimizes crosstalk, and simplifies escape routing in dense 2-layer designs. The SN74AHC16374DLG4's pin mapping is documented in Figure 1 (top view) of the SCLS330G datasheet.

What is the recommended power-up sequence for the SN74AHC16374DLG4 to ensure outputs remain in high-impedance state?

To guarantee high-impedance outputs during power-up and power-down, OE pins (1OE and 2OE) must be held high via external pull-up resistors to V_CC. TI recommends a minimum resistor value determined by the driver's current-sinking capability - typically 10 kΩ for standard CMOS drivers. OE has no effect on internal flip-flop operation, so data can be latched while outputs remain tri-stated. This behavior is explicitly described in the "description" section of the SN74AHC16374DLG4 datasheet (SCLS330G).

Is the SN74AHC16374DLG4 pin-compatible with other Widebus™ 16-bit registers?

Yes, the SN74AHC16374DLG4 shares identical pinout and function with SN74AHC16373DLR (latch version) and SN74AHC16244DLR (buffer version) in the DL package - all conform to JEDEC MO-153 and use the same 48-pin SSOP footprint. However, functional differences exist: SN74AHC16374DLG4 is edge-triggered, while SN74AHC16373DLR is transparent. Pin compatibility is confirmed in TI's Widebus™ family documentation and verified in the SCLS330G datasheet pin diagrams.