Texas Instruments CD74HC112PW

Overview

CD74HC112PW 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 clock-domain synchronization circuits.

For engineers reviewing the CD74HC112PW datasheet, CD74HC112PW pinout, CD74HC112PW application, or CD74HC112PW equivalent, key selection considerations include its TSSOP-16 package footprint, HC-family voltage flexibility (2–6 V), negative-edge triggering behavior, asynchronous PRE/CLR assertion timing, and compatibility with legacy LSTTL load requirements.

Technical Context

The CD74HC112PW 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 change occurring on the falling edge of CLK. Asynchronous PRE and CLR are active-low and override clocked operation.

It exhibits hysteresis on clock inputs for noise immunity, balanced propagation delays (tPLH/tPHL ≤ 46 ns at 6 V), and low dynamic power dissipation (CPD = 12 pF). Input leakage remains ≤ ±1 μA across temperature, and fanout capability is specified as 10 LSTTL loads under recommended operating conditions.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body, 1.2 mm max height), lead finish NIPDAU, moisture sensitivity level 1 (260°C peak reflow), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC112PW, SN74HC112PWR offers identical functionality with guaranteed active production status, while CD74HCT112PWR trades voltage flexibility for guaranteed TTL input compatibility - making the former ideal for new designs and the latter suitable only for strict 5 V legacy integration.

Availability

CD74HC112PW is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and high-reliability embedded control applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HC112PW 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 over 90 years of innovation in industrial, automotive, and aerospace markets.

The CD74HC112PW belongs to TI's legacy HC logic portfolio designed for robust, low-power, wide-temperature sequential logic in mission-critical systems where reliability and longevity outweigh cutting-edge speed.

FAQ

What is the maximum operating frequency of the CD74HC112PW?

The CD74HC112PW achieves a maximum clock frequency of 60 MHz under test conditions of VCC = 5 V, CL = 15 pF, and TA = 25°C. At full temperature range (–55°C to +125°C) and VCC = 6 V, fMAX is rated at 23 MHz - design margins must account for worst-case propagation delay (46 ns) and setup/hold timing constraints.

Does the CD74HC112PW support 3.3 V operation?

Yes, the CD74HC112PW fully supports 3.3 V operation as part of its 2 V to 6 V supply range. At VCC = 3.3 V, it maintains valid VIH (≥ 2.31 V) and VIL (≤ 1.1 V) thresholds, delivers ≥ 3.2 V VOH at 20 μA, and retains full functionality across –55°C to +125°C - making it suitable for mixed-voltage industrial systems.

How does the CD74HC112PW handle asynchronous reset and set?

The CD74HC112PW implements true asynchronous PRE (set) and CLR (reset) inputs that force Q to logic high or low regardless of clock state. Both are active-low and override all clocked J-K behavior. When both PRE and CLR are low simultaneously, outputs enter an undefined state - proper design requires ensuring they are never asserted together.

Is the CD74HC112PW pin-compatible with the CD74HCT112PW?

Yes, the CD74HC112PW and CD74HCT112PW share identical TSSOP-16 pinouts and functional assignments. However, they differ electrically: HC supports 2–6 V with CMOS input thresholds, while HCT mandates 4.5–5.5 V and accepts TTL-level inputs. Swapping them requires verifying supply voltage and driver compatibility.

What is the thermal resistance (RθJA) of the CD74HC112PW package?

The CD74HC112PW in TSSOP-16 package has a junction-to-ambient thermal resistance (RθJA) of 137.5°C/W, per TI's October 2022 datasheet revision. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance depends on PCB copper area, airflow, and nearby heat sources - derating is required above 85°C ambient.