NXP Semiconductors 74LV174N,112

Overview

74LV174N,112 from Philips Semiconductors is a low-voltage CMOS hex D-type flip-flop with asynchronous master reset and positive-edge clock triggering, operating from 1.0 V to 5.5 V supply, delivering 77 MHz max clock frequency at VCC = 3.3 V, 16 ns CP-to-Q propagation delay, and TTL-input compatibility at 2.7–3.6 V - used in synchronous logic control, data latching, and register staging in industrial microcontroller interfaces.

For engineers reviewing the 74LV174N,112 datasheet, 74LV174N,112 pinout, 74LV174N,112 application, or 74LV174N,112 equivalent, this device supports voltage-flexible digital system design where edge-triggered storage with common clock/reset is required across mixed-supply domains including 1.8 V, 2.5 V, 3.3 V, and 5 V logic families.

Technical Context

The 74LV174N,112 implements six independent edge-triggered D flip-flops sharing one LOW-to-HIGH clock (CP) input and one active-LOW asynchronous master reset (MR), with all outputs synchronized to the same clock edge. Its Si-gate CMOS architecture ensures rail-to-rail output swing and low static current draw.

It is functionally and pin-compatible with the 74HC/HCT174 but optimized for lower supply voltages (1.0–3.6 V), featuring input thresholds compliant with TTL levels at VCC ≥ 2.7 V and guaranteed operation down to 1.0 V with reduced DC specs starting at 1.2 V.

Key Specifications

Pinout & Package

74LV174N,112 is supplied in a 16-pin plastic dual in-line package (DIP), 300 mil width, SOT38-4 footprint, rated for –40°C to +125°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC174N and SN74LV174AD, the 74LV174N,112 uniquely supports 1.0 V operation and DIP packaging while maintaining full pin/function equivalence - making it the only option for through-hole prototyping or legacy 1.8 V/2.5 V systems requiring manual assembly.

Availability

74LV174N,112 is available at Aetrix Electronics and suitable for industrial automation, embedded control, and test equipment applications requiring stable component supply, long-term obsolescence management, and through-hole manufacturability.

Supply support for 74LV174N,112 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

Philips Semiconductors (now NXP Semiconductors) is a pioneer in logic IC development, delivering high-reliability, industry-standard digital components since the 1970s.

The 74LV174N,112 belongs to the LV (Low-Voltage) logic family designed specifically for mixed-voltage system integration, bridging legacy TTL and modern low-power CMOS domains with robust noise immunity and wide supply tolerance.

FAQ

What is the minimum supply voltage at which 74LV174N,112 guarantees correct operation?

The 74LV174N,112 is guaranteed to function down to VCC = 1.0 V when input levels are referenced to GND or VCC, though DC electrical characteristics are fully specified only from VCC = 1.2 V onward. At 1.0 V, functionality is maintained but parameters like VIH/VIL and propagation delay are not characterized - use 1.2 V or higher for production-critical designs requiring full spec compliance. The 74LV174N,112 remains operational across its entire 1.0–5.5 V range.

Is 74LV174N,112 pin-compatible with the standard 74HC174?

Yes, the 74LV174N,112 is pin and function compatible with the 74HC174 and 74HCT174, sharing identical pin configuration (MR, D0–D5, Q0–Q5, CP, GND, VCC) and truth table behavior. This allows direct substitution in existing HC/HCT designs, provided the lower-voltage operation and updated timing specs of the LV family are accounted for in timing analysis. The 74LV174N,112 retains the same DIP-16 mechanical footprint as the 74HC174N.

Does 74LV174N,112 support TTL-level inputs at 3.3 V supply?

Yes, the 74LV174N,112 accepts TTL input levels when VCC is between 2.7 V and 3.6 V: VIH = 2.0 V (minimum) and VIL = 0.8 V (maximum) - both within standard TTL output ranges (VOH ≥ 2.4 V, VOL ≤ 0.4 V). This enables direct connection to 5 V TTL outputs without level shifters, making the 74LV174N,112 ideal for mixed-voltage interface applications where 5 V logic drives a 3.3 V domain.

What is the maximum clock frequency supported by 74LV174N,112 at 2.5 V supply?

At VCC = 2.5 V, the 74LV174N,112 supports a maximum clock frequency of 34 MHz (typical) and 27 MHz (guaranteed minimum) over the –40°C to +85°C temperature range, per AC characteristics table. This value is derived from measured tPHL/tPLH delays and setup/hold timing margins. For reliable operation at 2.5 V, ensure input rise/fall times meet tr/tf ≤ 200 ns/V and load capacitance stays ≤ 50 pF, as specified in the 74LV174N,112 datasheet.

Can the master reset (MR) input of 74LV174N,112 be left unconnected in normal operation?

No, the MR input of the 74LV174N,112 must not be left floating: it is an active-LOW asynchronous input with no internal pull-up. An unconnected MR may float to an indeterminate voltage, causing unintended resets or metastable output states. Always tie MR to VCC via a pull-up resistor (e.g., 10 kΩ) or drive it actively. In systems requiring default-reset behavior, connect MR to a controlled reset generator. This requirement applies strictly to the 74LV174N,112 and is documented in Philips' recommended operating conditions.