Texas Instruments 8405601CA

Overview

8405601CA from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with asynchronous preset and clear inputs per channel, operating across 2 V to 6 V supply voltage and -40°C to +85°C temperature range. It delivers 39 ns max propagation delay (VCC = 6 V), supports fanout of up to 10 LSTTL loads, and enables clock division by 2 or 4 in digital logic systems.

For engineers reviewing the 8405601CA datasheet, 8405601CA pinout, 8405601CA application, or 8405601CA equivalent, this device serves as a foundational building block for synchronous state machines, debounced switch interfaces, and frequency division circuits where precise edge-triggered storage and low-power CMOS operation are required.

Technical Context

The 8405601CA implements two independent CMOS-based D flip-flops sharing no internal coupling-each with dedicated CLK, D, PRE, CLR, Q, and Q̅ terminals. Its asynchronous preset and clear operate at active-low logic levels and override clocked data behavior regardless of CLK state.

It uses standard CMOS input structure with ≤10 pF input capacitance and balanced push-pull outputs capable of sourcing/sinking ±4 mA (VCC = 4.5 V) while maintaining VOH ≥ 3.98 V and VOL ≤ 0.33 V under load-enabling direct interfacing with TTL and other HC-series logic without level-shifting.

Key Specifications

Pinout & Package

8405601CA is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package measuring 8.70 mm × 3.90 mm, with standard 1.27 mm pitch and surface-mount footprint compatible with IPC-7351B SOIC-14 density A land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC74D and MC74HC74ADTR2G, 8405601CA offers identical industrial-grade performance in the widely adopted SOIC-14 package-making it optimal for cost-sensitive, volume-manufactured industrial electronics where layout stability and procurement simplicity are prioritized.

Availability

8405601CA is available at Aetrix Electronics and suitable for industrial control logic, digital signal conditioning, test equipment sequencing, and legacy system interfacing requiring stable component supply across long production lifecycles.

Supply support for 8405601CA 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 communications markets.

The 8405601CA belongs to TI's 74HC logic family-designed specifically for low-power, high-noise-immunity digital control in resource-constrained embedded systems where reliability and interoperability with legacy TTL infrastructure are essential.

FAQ

What is the maximum clock frequency supported by the 8405601CA?

The 8405601CA supports a maximum clock frequency of 29 MHz when operated at VCC = 6 V and TA = –40°C to +85°C. At lower supply voltages, the limit decreases to 25 MHz at 4.5 V and 5 MHz at 2 V. These values are guaranteed under recommended operating conditions and include margin for process variation and temperature drift.

Does the 8405601CA require external pull-up resistors on PRE and CLR pins?

Yes - the 8405601CA PRE and CLR pins are active-low asynchronous inputs and must be held HIGH during normal operation to prevent unintended reset or preset. A 10-kΩ pull-up resistor to VCC is recommended for unused or statically controlled PRE/CLR lines to ensure defined logic states and avoid floating inputs.

Can the 8405601CA drive LED indicators directly?

No - the 8405601CA is not designed for direct LED drive. Its outputs source/sink only ±4 mA (VCC = 4.5 V), insufficient for typical indicator LEDs requiring 5–20 mA. Driving an LED directly risks violating absolute maximum ratings and degrading VOL/VOH performance. Use a discrete transistor or dedicated LED driver stage instead.

How does the 8405601CA handle unused inputs?

All unused inputs on the 8405601CA must be terminated to a valid logic level - either VCC or GND - to prevent floating states that cause excessive current draw, oscillation, or undefined outputs. Direct connection is acceptable for permanently unused pins; pull-up/pull-down resistors (e.g., 10 kΩ) are preferred when flexibility for future reconfiguration is needed.

Is the 8405601CA pin-compatible with older 74LS74 devices?

No - although functionally similar, the 8405601CA (74HC logic) is not pin-compatible with 74LS74 (TTL logic). While both use 14-pin packages, their electrical characteristics differ significantly: 74LS74 draws higher quiescent current, has different input thresholds, and lacks the wide 2–6 V supply range of the 8405601CA. Direct replacement requires verification of voltage levels, timing, and loading.