Texas Instruments SN74AHC16374DGGR

Overview

SN74AHC16374 from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for high-speed bus interfacing in industrial and embedded systems. It operates from 2 V to 5.5 V, supports 160 MHz maximum clock frequency at 5 V, features dual 8-bit sections with independent clocks and output enables, and delivers ±8 mA output drive at 5 V - enabling direct connection to capacitive or low-impedance buses without external pull-ups.

For engineers reviewing the SN74AHC16374 datasheet, SN74AHC16374 pinout, SN74AHC16374 application, or SN74AHC16374 equivalent, key selection considerations include its 48-pin TSSOP (DGG) package, flow-through pin architecture for optimized PCB layout, distributed V_CC/GND pins minimizing switching noise, and guaranteed operation from –40°C to 85°C.

Technical Context

The SN74AHC16374 implements two independent 8-bit positive-edge-triggered D-type flip-flop banks, each with dedicated CLK and OE inputs. Internal latching occurs on the rising edge of CLK, while OE controls high-impedance state independently per bank without affecting internal register operation.

Its EPIC™ CMOS process ensures latch-up immunity >250 mA (JESD 17), ESD protection >2 kV (MIL-STD-883), and rail-to-rail input voltage tolerance (–0.5 V to V_CC + 0.5 V). The flow-through pinout places inputs on one side and outputs on the opposite, reducing trace crossovers in dense bus designs.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 12.5 mm × 6.2 mm body, 0.5 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant. Gull-wing leads with NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16374ADGGR and 74AC16374PCB, the SN74AHC16374 provides optimal balance of 2–5.5 V operation, 130 MHz speed, and TSSOP-48 footprint - making it the preferred choice for modern industrial PCBs requiring mixed-voltage bus buffering with minimal board area.

Availability

SN74AHC16374 is available at Aetrix Electronics and suitable for industrial automation controllers, embedded communication gateways, and test equipment requiring stable component supply and long-term manufacturability.

Supply support for SN74AHC16374 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 for industrial, automotive, and communications markets.

The SN74AHC16374 belongs to the Widebus™ family of high-speed CMOS logic devices, engineered specifically for low-noise, high-drive bus interfacing in space-constrained industrial systems.

FAQ

What is the maximum clock frequency supported by the SN74AHC16374 at 3.3 V operation?

The SN74AHC16374 supports a maximum clock frequency of 110 MHz at V_CC = 3.3 V with a 15-pF load, as specified in the switching characteristics table. This allows reliable use in 3.3 V digital subsystems such as FPGA I/O expansion or ARM-based peripheral interfaces where timing margins must accommodate propagation delays and setup/hold constraints.

How does the SN74AHC16374 handle power-up sequencing to avoid bus contention?

The SN74AHC16374 requires OE to be tied to V_CC via a pullup resistor at power-up to ensure outputs enter high-impedance state before internal logic stabilizes. This prevents unintended driving of shared bus lines during voltage ramp-up. The minimum resistor value depends on the current-sinking capability of the driver controlling OE, typically 10 kΩ for standard CMOS drivers.

Can the SN74AHC16374 be used as two independent 8-bit registers?

Yes, the SN74AHC16374 contains two functionally independent 8-bit sections - 1Q1–1Q8 with 1CLK/1OE and 2Q1–2Q8 with 2CLK/2OE. Each section operates autonomously: data on 1D1–1D8 is latched only on 1CLK edges, and outputs are enabled only by 1OE. This enables split-bus architectures or staggered sampling in multi-channel systems.

What is the recommended PCB layout practice for minimizing noise with the SN74AHC16374?

To minimize high-speed switching noise, place 0.1 µF ceramic decoupling capacitors within 3 mm of each V_CC pin, route V_CC and GND traces as wide low-inductance planes, and leverage the device's distributed power pins (four V_CC, six GND) to reduce ground bounce. Avoid routing sensitive analog traces beneath the SN74AHC16374 footprint.

Does the SN74AHC16374 support hot insertion into a live bus?

The SN74AHC16374 is not hot-plug rated per industry standards. While its absolute maximum ratings tolerate –0.5 V to 7 V on inputs/outputs, and OE can force high-Z before power stabilization, TI does not guarantee safe insertion into powered buses. System-level protection (e.g., series resistors, bus isolators) is required for true hot-swap operation.