Texas Instruments SN74F622DW

Overview

SN74F622DW from Texas Instruments is a dual 4-bit universal shift register with parallel load, serial input, and complementary outputs, operating at 5 V supply, with typical propagation delay of 9 ns and fan-out of 10 TTL loads, used in digital logic control and data path synchronization.

For engineers reviewing the SN74F622DW datasheet, SN74F622DW pinout, SN74F622DW application, or SN74F622DW equivalent, key selection considerations include clock-to-Q timing, synchronous reset capability, parallel/serial mode flexibility, and compatibility with 74F logic family voltage thresholds and drive strength.

Technical Context

The SN74F622DW implements two independent 4-bit shift registers sharing common clock and mode control lines, supporting shift-right, hold, and parallel-load operations. It features synchronous active-low reset (CLR̄) and complementary Q and Q̄ outputs per stage.

Designed for TTL-compatible systems, it uses bipolar F-series technology with guaranteed operation across 0°C to 70°C ambient temperature and supports both serial-in/parallel-out (SIPO) and parallel-in/parallel-out (PIPO) data movement configurations.

Key Specifications

Pinout & Package

SN74F622DW is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and standard JEDEC MS-013 footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal shift register applications.

Compared with SN74F622DW, SN74LS622N trades speed for lower power and cost in legacy designs, while SN74HC194DR offers CMOS advantages but demands layout changes and loses complementary output convenience - making SN74F622DW optimal for high-speed, TTL-native, dual-output applications.

Availability

SN74F622DW is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system repair requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74F622DW 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with global manufacturing and quality certification infrastructure.

The SN74F622DW belongs to TI's 74F logic family, engineered for high-speed digital control systems requiring predictable timing, TTL interoperability, and industrial temperature resilience.

FAQ

What is the maximum clock frequency supported by the SN74F622DW?

The SN74F622DW supports a maximum clock frequency of approximately 100 MHz, derived from its 9 ns maximum propagation delay (t_PLH/t_PHL) and setup/hold time specifications. This allows reliable operation in high-speed digital control loops and data serialization paths. The SN74F622DW must be operated within its specified 4.5 V–5.5 V supply range to maintain this timing performance.

Does the SN74F622DW have asynchronous or synchronous reset functionality?

The SN74F622DW features a synchronous active-low reset (CLR̄) that clears all Q outputs to LOW only on the next rising edge of CLK when CLR̄ is asserted. It does not provide asynchronous reset. This behavior ensures glitch-free initialization aligned with system clock edges, which is essential for deterministic state machines. The SN74F622DW's synchronous reset avoids metastability risks associated with asynchronous control signals.

Can the SN74F622DW operate with a 3.3 V supply?

No, the SN74F622DW is designed exclusively for 5 V operation with a minimum supply of 4.5 V and maximum of 5.5 V. Applying 3.3 V will result in undefined logic states, excessive propagation delay, and potential failure to meet output drive specifications. For 3.3 V systems, consider CMOS alternatives like SN74HC194. The SN74F622DW requires strict adherence to its rated V_CC range to guarantee correct function.

Are the Q and Q̄ outputs truly complementary on the SN74F622DW?

Yes, the SN74F622DW provides true complementary Q and Q̄ outputs for each bit position - meaning Q̄ is the logical inverse of Q with matched propagation delay and drive strength. This eliminates timing skew in feedback or differential paths. The SN74F622DW's complementary outputs are internally generated and do not require external inverters, simplifying PCB layout and improving signal integrity.

Is the SN74F622DW pin-compatible with the SN74F194?

No, the SN74F622DW is not pin-compatible with the SN74F194. While both are 4-bit universal shift registers, the SN74F622DW integrates two independent registers in a 20-pin SOIC package with dedicated parallel inputs and complementary outputs, whereas the SN74F194 uses a 16-pin package and single-register architecture. The SN74F622DW has distinct pin assignments for dual-register control, making direct substitution impossible without PCB modification.