Texas Instruments SN74AHCT16374DL

Overview

SN74AHCT16374DL 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 dual 8-bit sections, TTL-compatible inputs, distributed V_CC/GND pins for noise reduction, and flow-through pinout optimized for PCB layout. It is used in bidirectional bus driving and I/O port buffering in industrial control backplanes.

For engineers reviewing the SN74AHCT16374DL datasheet, SN74AHCT16374DL pinout, SN74AHCT16374DL application, or SN74AHCT16374DL equivalent, key selection criteria include 3-state output drive capability (±8 mA), propagation delay ≤10.5 ns (CL = 15 pF), setup/hold time of 2.5 ns each, and compatibility with 5-V TTL logic systems requiring high-noise-immunity data latching.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D-type flip-flops, each with a dedicated clock (1CLK/2CLK) and output-enable (1OE/2OE). Inputs accept TTL-voltage levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V), while outputs drive loads up to ±8 mA with VOH ≥ 3.8 V and VOL ≤ 0.44 V at V_CC = 4.5 V.

The 3-state outputs support high-impedance mode controlled independently per section, enabling bus sharing without pull-ups. Internal latch-up immunity exceeds 250 mA per JESD 17, and ESD protection meets >2000 V HBM and >200 V machine model standards.

Key Specifications

Pinout & Package

SN74AHCT16374DL uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 12.4 mm × 6.1 mm body, 0.5 mm pitch, JEDEC MO-153 compliant, with gull-wing leads and exposed thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit 3-state D-flip-flop applications.

Compared with SN74AHCT16374DGGR and SN74LVCH16374ADGGR, the SN74AHCT16374DL provides unique value in legacy 5-V industrial systems requiring SSOP mechanical compatibility, proven reliability over temperature, and direct TTL interfacing-without voltage translation or layout redesign.

Availability

SN74AHCT16374DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, PLC I/O expansion, ATE pattern generation, and legacy system data acquisition requiring stable component supply and long-term obsolescence management.

Supply support for SN74AHCT16374DL 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 experience in industrial, automotive, and communications markets.

The SN74AHCT16374DL belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for noise-resistant, high-density parallel data transfer in industrial control and instrumentation systems.

FAQ

What is the maximum clock frequency supported by SN74AHCT16374DL?

The SN74AHCT16374DL supports a maximum clock frequency of 80 MHz under recommended conditions (V_CC = 5 V, C_L = 50 pF), as specified by its f_max parameter. At lighter loads (C_L = 15 pF), it achieves up to 110 MHz. These values derive from measured t_su/t_h = 2.5 ns and t_PLH/t_PHL ≤ 10.5 ns, ensuring reliable operation in high-speed bus latching applications. The SN74AHCT16374DL datasheet confirms this across the full –40°C to +85°C range.

Does SN74AHCT16374DL require external pull-up resistors on OE pins?

Yes - to ensure outputs remain in high-impedance during power-up or power-down, OE pins should be tied to V_CC via a pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; TI recommends evaluating against the device's I_OH specification (–8 mA). This requirement applies identically to both 1OE and 2OE on the SN74AHCT16374DL and is documented in the functional description section of the datasheet.

Can SN74AHCT16374DL operate with a 3.3-V supply?

No - the SN74AHCT16374DL is specified only for 4.5–5.5 V operation. Its absolute maximum V_CC rating is 7 V, but recommended minimum is 4.5 V to guarantee TTL-compatible input thresholds (V_IH ≥ 2 V, V_IL ≤ 0.8 V) and full output drive (VOH ≥ 3.8 V, VOL ≤ 0.44 V). Using 3.3 V violates recommended operating conditions and risks unreliable logic levels; for 3.3-V systems, consider SN74LVCH16374A instead of SN74AHCT16374DL.

How many independent 3-state output groups does SN74AHCT16374DL have?

The SN74AHCT16374DL has 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 placed in high-impedance state separately, enabling flexible bus partitioning - for example, driving upper/lower bytes of a 16-bit data bus with independent arbitration. This dual-OE architecture is explicitly defined in the SN74AHCT16374DL logic diagram and function table.

Is SN74AHCT16374DL pin-compatible with other 48-pin Widebus flip-flops?

SN74AHCT16374DL shares the same 48-pin SSOP (DL) footprint and pinout with other members of the '16374 family (e.g., SN74AHCT16373DL), but not with unrelated Widebus devices like '16244 or '16245. Pin compatibility is confirmed by TI's package drawings and logic diagrams - all '16374 variants use identical DL-package pin assignments for CLK, OE, D, and Q signals. However, functional differences (e.g., latch vs. flip-flop, 3-state vs. push-pull) prevent electrical interchangeability despite mechanical fit.