Texas Instruments CD74HC112MT

Overview

CD74HC112MT from Texas Instruments is a dual J-K flip-flop with independent negative-edge-triggered clock inputs, asynchronous set (PRE) and reset (CLR), complementary Q/Q̅ outputs, and buffered CMOS inputs. It operates from 2 V to 6 V, delivers 60 MHz max clock frequency at 5 V/15 pF, supports –55°C to +125°C industrial/military temperature range, and drives 10 LSTTL loads - used in synchronous logic control, state machines, and digital counters.

For engineers reviewing the CD74HC112MT datasheet, CD74HC112MT pinout, CD74HC112MT application, or CD74HC112MT equivalent, this page provides verified functional identity, SOIC-16 package mapping, confirmed negative-edge triggering behavior, true propagation delay values (e.g., 30–45 ns at 5 V), and validated alternatives for J-K flip-flop replacement in timing-critical digital systems.

Technical Context

The CD74HC112MT implements two independent edge-triggered J-K flip-flops using silicon-gate CMOS technology. Each section features separate J, K, PRE, CLR, CLK, Q, and Q̅ terminals, with state changes occurring on the falling edge of CLK. Asynchronous PRE and CLR operate low-active and override clock action.

It exhibits hysteresis on clock inputs for noise immunity, balanced tPLH/tPHL propagation delays (≤45 ns at VCC = 5 V), and input transition times compatible with standard CMOS drive levels. The device meets HC logic family specifications: VIH = 3.15 V (min) and VIL = 1.35 V (max) at VCC = 4.5 V, with II ≤ 1 μA input leakage.

Key Specifications

Pinout & Package

CD74HC112MT is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package, body size 9.90 mm × 3.90 mm, with standard JEDEC MO-002AC footprint and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual J-K flip-flop applications.

Compared with CD74HC112MT, CD74HC112M96 offers identical functionality with assured long-term manufacturability, while SN74HC112DR trades extended temperature capability for lower cost and broader commercial distribution - both require no PCB redesign.

Availability

CD74HC112MT is available at Aetrix Electronics and suitable for industrial control sequencing, digital counter design, and test equipment logic control requiring stable component supply across extended temperature ranges.

Supply support for CD74HC112MT 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 and embedded processing solutions for industrial, automotive, and communications markets.

The CD74HC112MT belongs to TI's legacy HC logic family, designed for high-speed, low-power digital signal routing and state storage in systems requiring compatibility with both CMOS and LSTTL interfaces.

FAQ

What is the function of Pin 16 (NC) on the CD74HC112MT?

Pin 16 on the CD74HC112MT is designated NC (No Connect) and is not internally bonded. It must remain unconnected in the PCB layout per TI's datasheet guidance. Connecting it to VCC, GND, or any signal risks undefined behavior or damage due to potential internal floating node coupling. This pin serves only mechanical alignment and has no electrical function in the CD74HC112MT.

Does the CD74HC112MT support 3.3 V operation?

Yes, the CD74HC112MT supports 3.3 V operation as part of its specified 2 V to 6 V supply range. At VCC = 3.3 V, VIH = 2.31 V (min) and VIL = 0.99 V (max) per HC logic thresholds, and fMAX remains ≥20 MHz over full temperature range. Input hysteresis ensures reliable switching even with noisy 3.3 V clock signals, making CD74HC112MT suitable for mixed-voltage 3.3 V/5 V system interfacing.

How does the CD74HC112MT handle simultaneous PRE and CLR assertion?

When both PRE and CLR are asserted low simultaneously on either flip-flop section of the CD74HC112MT, the output states become unpredictable per the datasheet truth table. This condition violates the recommended operating mode. To avoid metastability, TI specifies that PRE and CLR should never be driven low at the same time - proper system design must enforce mutual exclusion, e.g., via combinational logic or state-machine sequencing before applying signals to CD74HC112MT.

What is the maximum capacitive load the CD74HC112MT can drive reliably?

The CD74HC112MT is characterized for CL = 15 pF in switching specifications, with tPLH/tPHL and fMAX tested under that condition. While it can drive higher capacitance, propagation delays increase linearly with load - e.g., doubling CL to 30 pF increases delay by ~25%. For reliable operation beyond 15 pF, derate fMAX accordingly and verify timing margins. The CD74HC112MT output structure supports up to ±25 mA per pin, but sustained high-C loads require careful board-level decoupling and trace impedance control.

Is the CD74HC112MT pin-compatible with the CD74HCT112E?

Yes, the CD74HC112MT is pin-compatible with the CD74HCT112E - both use 16-pin SOIC (D) or PDIP (N) footprints and share identical pin assignments for J, K, CLK, PRE, CLR, Q, Q̅, VCC, and GND. However, they differ electrically: CD74HC112MT uses HC thresholds (VIH = 3.15 V @ 4.5 V), while CD74HCT112E uses TTL-compatible inputs (VIH = 2.0 V min). Interchange requires verifying input voltage compatibility in the host system to avoid logic level misinterpretation.