Texas Instruments SN74AHCT16374DLR

Overview

SN74AHCT16374DLR 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 –40°C to 85°C at 4.5–5.5 V supply. It features TTL-compatible inputs, ±8 mA output drive, 2.5 ns data setup/hold times, and supports dual 8-bit or single 16-bit register operation in high-capacitance bus interfacing applications.

For engineers reviewing the SN74AHCT16374DLR datasheet, SN74AHCT16374DLR pinout, SN74AHCT16374DLR application, or SN74AHCT16374DLR equivalent, key selection considerations include 3-state bus driving capability, propagation delay under 10.5 ns at 15 pF load, thermal impedance of 63°C/W, input transition rate tolerance of 20 ns/V, and compatibility with 5-V logic systems requiring latch-up immunity >250 mA.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D flip-flops with separate clock (CLK) and output-enable (OE) controls per section. Each section drives eight 3-state outputs with rail-to-rail VOH/VOL performance (3.8 V/0.44 V at –8/+8 mA), enabling direct connection to shared data buses without pull-ups or interface logic.

The DL-package variant uses distributed VCC/GND pins to suppress high-speed switching noise, employs EPIC™ CMOS process for enhanced speed-power trade-off, and maintains functional integrity during power sequencing via OE pull-up recommendation-OE does not affect internal state retention or data loading while outputs are tri-stated.

Key Specifications

Pinout & Package

SN74AHCT16374DLR uses a 48-pin Shrink Small-Outline Package (SSOP-DL) with 0.5-mm pitch, 12.6 mm × 6.2 mm body size, and 1.2-mm max height. Pin 1 located at top-left corner with notch marking; gage plane defined per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT16374DLR, SN74AHCT162244DLR provides identical physical interface and drive but lacks storage-making it unsuitable for timing-critical register functions-while SN74LVCH16374ADGGR delivers faster performance at lower voltage but introduces level-shifting complexity in 5-V environments.

Availability

SN74AHCT16374DLR is available at Aetrix Electronics and suitable for industrial I/O expansion, memory interface buffering, test equipment signal conditioning, and legacy system bus bridging requiring stable component supply across extended temperature ranges.

Supply support for SN74AHCT16374DLR 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The SN74AHCT16374DLR belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for robust 16-bit data path management in noise-sensitive industrial and instrumentation systems.

FAQ

What is the maximum clock frequency supported by SN74AHCT16374DLR?

The SN74AHCT16374DLR supports up to 110 MHz operation with 15-pF load and 5-V supply, as specified in its switching characteristics table. At 50-pF load, maximum frequency drops to 75 MHz. These values assume clean power delivery and proper PCB layout per TI's recommended guidelines-actual system-level frequency depends on trace capacitance, termination, and driver strength.

Does SN74AHCT16374DLR require external pull-up resistors on OE pins?

Yes-TI recommends tying OE pins to VCC through a pull-up resistor during power-up/down to guarantee high-impedance outputs before internal logic stabilizes. The minimum resistor value depends on the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ for standard logic drivers. OE remains functional after power stabilization and does not affect internal flip-flop operation.

Can SN74AHCT16374DLR operate with a 3.3-V supply?

No-SN74AHCT16374DLR is specified only for 4.5–5.5 V operation. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V systems. Using 3.3 V violates recommended operating conditions and may result in unreliable logic levels, increased propagation delay, or failure to meet AC timing specs. For 3.3-V applications, consider SN74LVCH16374ADGGR instead.

How many independent 3-state output groups does SN74AHCT16374DLR provide?

SN74AHCT16374DLR provides two independent 3-state output groups: one for bits 1Q1–1Q8 controlled by 1OE, and another for 2Q1–2Q8 controlled by 2OE. Each group can be enabled or disabled separately while maintaining internal state, enabling flexible bus partitioning-for example, using one section for address latching and the other for data staging without shared control logic.

Is SN74AHCT16374DLR pin-compatible with other 48-pin Widebus™ devices?

SN74AHCT16374DLR shares the same 48-pin DL package footprint and pinout with other members of the '16374 family (e.g., SN74AHCT16373), but is not pin-compatible with unrelated Widebus™ devices like '16244 or '16245 due to differing functional assignments (e.g., clock vs. enable-only inputs). Always verify pin mapping against the specific device's datasheet before board reuse.