Texas Instruments CD74HC112PWT

Overview

CD74HC112PWT from Texas Instruments is a dual J-K flip-flop with asynchronous set and reset, negative-edge clock triggering, complementary Q/Q outputs, and buffered 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 CD74HC112PWT datasheet, CD74HC112PWT pinout, CD74HC112PWT application, or CD74HC112PWT equivalent, key selection criteria include negative-edge triggering behavior, wide VCC range compatibility, guaranteed propagation delay (≤45 ns at 6 V), thermal robustness across extreme temperatures, and direct replacement capability for legacy LS112 in CMOS-based timing and control circuits.

Technical Context

The CD74HC112PWT implements two independent edge-triggered J-K flip-flops using silicon-gate CMOS technology, achieving LSTTL-equivalent speed with CMOS power efficiency. Each section features separate J, K, PRE (asynchronous set), CLR (asynchronous reset), CLK, Q, and Q̅ terminals, with state change occurring exclusively on the falling edge of CLK.

Hysteresis on clock inputs improves noise immunity and accommodates slower rise/fall times; input leakage remains ≤1 μA over temperature; and propagation delays are balanced between rising and falling edges (tPLH ≈ tPHL) to minimize duty-cycle distortion in clocked systems.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC112DR and CD74HCT112PWR, the CD74HC112PWT offers superior voltage flexibility (2–6 V), smaller PCB footprint (TSSOP-16), and broader temperature resilience (–55°C to +125°C), making it optimal for space-constrained, multi-rail, or harsh-environment deployments where pin compatibility and functional equivalence are maintained.

Availability

CD74HC112PWT is available at Aetrix Electronics and suitable for industrial PLC control logic, automotive body electronics, military data acquisition systems, and digital counter circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC112PWT 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, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CD74HC112PWT belongs to TI's 74HC logic family - designed for high-speed, low-power, wide-supply-voltage digital control and sequencing in mission-critical systems where reliability and temperature resilience are paramount.

FAQ

What is the maximum clock frequency supported by CD74HC112PWT?

The CD74HC112PWT supports a maximum clock frequency of 60 MHz under specified conditions: VCC = 5 V, CL = 15 pF, TA = 25°C. At 6 V supply, fMAX drops to 35 MHz (–55°C to +125°C), and at 2 V, it is limited to 6 MHz. These values are measured with 50% duty cycle input and reflect guaranteed performance across temperature and voltage ranges per TI's SCHS141J datasheet.

Does CD74HC112PWT support 3.3 V operation?

Yes, CD74HC112PWT 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 logic thresholds (VIH ≈ 2.31 V, VIL ≈ 0.99 V), delivers typical propagation delay <55 ns, and drives up to 10 LSTTL loads - making it suitable for direct interface with 3.3 V microcontrollers and FPGAs without level shifting.

What is the function of Pin 1 and Pin 16 on CD74HC112PWT?

Pin 1 is CLR1 (asynchronous clear for Flip-Flop 1), and Pin 16 is CLR2 (asynchronous clear for Flip-Flop 2). Both are active-low inputs: asserting either pin LOW forces the corresponding Q output LOW and Q̅ HIGH, independent of clock or J/K states. These pins require pull-up resistors if left undriven to prevent unintended reset during power-up or idle states.

Is CD74HC112PWT pin-compatible with CD74HCT112PWR?

Yes, CD74HC112PWT and CD74HCT112PWR share identical TSSOP-16 pinout and terminal assignments. However, they are not functionally interchangeable without circuit review: CD74HC112PWT operates from 2–6 V with CMOS input thresholds, while CD74HCT112PWR requires 4.5–5.5 V and accepts TTL-level inputs. Voltage domain mismatch may cause logic failure if substituted blindly.

How does the hysteresis on CD74HC112PWT clock inputs improve system reliability?

The hysteresis on CD74HC112PWT clock inputs increases noise immunity by widening the voltage difference between VIH and VIL thresholds - typically ~30% of VCC. This prevents multiple clock toggles from a single noisy edge, suppresses false triggering from EMI or crosstalk, and allows reliable operation with slower-rising clock signals (e.g., from RC networks or long traces), directly enhancing timing integrity in electrically noisy industrial or automotive environments.