Texas Instruments SN74LV174ANS

Overview

SN74LV174ANS from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, designed for 2-V to 5.5-V supply operation and characterized for –40°C to 85°C industrial temperature range. It features six independent D-flip-flop channels, direct active-low CLR input, and mixed-mode voltage interface support across all I/O ports. Used in digital control logic, state machines, and data synchronization circuits requiring deterministic edge-triggered storage.

For engineers reviewing the SN74LV174ANS datasheet, SN74LV174ANS pinout, SN74LV174ANS application, or SN74LV174ANS equivalent, key selection criteria include setup/hold timing at 3.3 V (tsu = 3 ns, th = 0 ns), propagation delay (tpd = 5.8–13 ns depending on VCC and load), output drive capability (±6 mA at 3.3 V), and compatibility with 2.5 V/3.3 V/5 V logic systems.

Technical Context

The SN74LV174ANS implements six identical D-type latches synchronized to the rising edge of CLK, with a shared asynchronous active-low CLR that forces all Q outputs low regardless of clock state. Each channel operates independently, with no internal feedback or inter-channel coupling beyond shared control signals.

Its EPIC™ (Enhanced-Performance Implanted CMOS) process enables robust noise immunity, including ground bounce (VOLP < 0.8 V) and VOH undershoot (VOHV > 2.3 V) specifications at 3.3 V, alongside latch-up immunity exceeding 250 mA per JESD17 and ESD protection >2000 V HBM.

Key Specifications

Pinout & Package

SN74LV174ANS is supplied in a 16-pin plastic small-outline (NS) package, measuring 9.9 mm × 3.91 mm × 1.45 mm (JEDEC MS-012). The NS package is lead-free and RoHS-compliant, with gull-wing leads optimized for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC174APWR and 74HC174D,653, the SN74LV174ANS delivers superior noise immunity at 3.3 V, lower quiescent current, and guaranteed industrial temperature operation - making it optimal for noise-sensitive, power-constrained, and thermally demanding applications where deterministic timing and robustness are prioritized over absolute maximum speed.

Availability

SN74LV174ANS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and digital power supply sequencing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74LV174ANS 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 ICs, with decades of experience in high-reliability industrial and automotive components.

The SN74LV174ANS belongs to TI's LV logic family, engineered for low-voltage, high-noise-immunity digital interfacing in mixed-signal systems where signal integrity and thermal stability are critical design constraints.

FAQ

What is the maximum clock frequency supported by the SN74LV174ANS at 3.3 V?

The SN74LV174ANS supports a maximum clock frequency of 170 MHz under CL = 15 pF load at 3.3 V (typical), with guaranteed minimum f_max of 80 MHz. This allows reliable operation in high-speed digital control loops and test equipment pattern generators where precise edge-aligned sampling is required. The actual usable frequency depends on board layout, load capacitance, and signal integrity margins.

Does the SN74LV174ANS support mixed-voltage operation between 2.5 V and 3.3 V domains?

Yes, the SN74LV174ANS supports mixed-mode voltage operation on all ports: inputs accept voltages from 0 V to VCC + 0.5 V, and outputs swing rail-to-rail within the VCC range (2 V to 5.5 V). This enables direct interfacing between 2.5 V microcontrollers and 3.3 V peripheral logic without external level shifters, provided VCC is set to the higher domain voltage.

What is the purpose of the EPIC™ process used in the SN74LV174ANS?

The EPIC™ (Enhanced-Performance Implanted CMOS) process in the SN74LV174ANS delivers improved noise immunity, specifically reducing output ground bounce (VOLP < 0.8 V) and VOH undershoot (VOHV > 2.3 V) at 3.3 V. This process also contributes to latch-up immunity exceeding 250 mA and ESD robustness >2000 V HBM - essential for stable operation in electrically noisy industrial and automotive environments.

Can unused inputs on the SN74LV174ANS be left floating?

No, all unused inputs on the SN74LV174ANS must be tied to VCC or GND to prevent undefined logic states, increased ICC, and potential oscillation. TI's application report SCBA004 explicitly warns against floating CMOS inputs due to risk of shoot-through current and erratic behavior. For example, unconnected D inputs should be pulled high or low via 10-kΩ resistors depending on desired default state.

How does the asynchronous CLR input behave relative to the clock in the SN74LV174ANS?

The asynchronous CLR input in the SN74LV174ANS overrides all clock activity: when asserted low, it forces all six Q outputs to logic low within 5 ns, regardless of CLK state or timing. This behavior is immediate and edge-independent, enabling system-wide reset, fault recovery, or initialization sequences without waiting for a clock edge - a critical feature for safety-critical and deterministic control applications.