Texas Instruments SN74ABT377ADWR

Overview

SN74ABT377ADWR from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with clock enable, designed for synchronous data latching in high-speed digital systems. It features 8-bit parallel storage, ±32-mA/64-mA high-drive outputs, 150-MHz maximum clock frequency, and operates over –40°C to 85°C. It is used in buffer/register implementations within industrial control logic and data acquisition subsystems.

For engineers reviewing the SN74ABT377ADWR datasheet, SN74ABT377ADWR pinout, SN74ABT377ADWR application, or SN74ABT377ADWR equivalent, key selection considerations include clock-enable timing (3-ns setup/1.2-ns hold), output drive capability (–32 mA IOH / 64 mA IOL), latch-up immunity (>500 mA per JESD-17), and SOIC-20 package compatibility with standard 0.65-mm lead pitch PCB layouts.

Technical Context

This device implements eight independent D-type flip-flops sharing a common clock (CLK) and clock-enable (CLKEN) input. Each stage triggers on the positive edge of CLK only when CLKEN is low, preventing spurious updates during enable transitions. The EPIC-II^B BiCMOS process enables TTL-compatible input thresholds while delivering CMOS-level power efficiency and noise immunity.

Output stages use high-current push-pull drivers capable of sourcing –32 mA and sinking 64 mA at VCC = 5 V, supporting direct interface with multiple TTL loads or bus termination. Ground bounce (VOLP) remains below 1 V under switching conditions, ensuring signal integrity in dense logic arrays.

Key Specifications

Pinout & Package

SN74ABT377ADWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm, with 0.65-mm lead pitch and RoHS-compliant NiPdAu plating. It adheres to JEDEC MS-013 and is rated MSL Level-1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT573ADWR and SN74LVC574APW, SN74ABT377ADWR uniquely provides edge-triggered operation with 5-V robustness and industrial temperature range - making it irreplaceable in legacy 5-V control systems requiring precise clock-domain synchronization.

Availability

SN74ABT377ADWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, test equipment pattern generation, communications backplane buffering, and legacy bus interface adapter applications requiring stable component supply and long-term production continuity.

Supply support for SN74ABT377ADWR 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 decades of heritage in high-reliability industrial and automotive-grade components.

SN74ABT377ADWR belongs to the ABT logic family - engineered for 5-V systems demanding high speed, strong drive, and robust noise immunity in factory automation and instrumentation applications.

FAQ

What is the maximum clock frequency supported by SN74ABT377ADWR?

The SN74ABT377ADWR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating is validated across the full industrial temperature range (–40°C to +85°C), with timing parameters including 3.3-ns minimum pulse width and 2.0-ns data setup time relative to the rising clock edge. The device maintains this performance using its EPIC-II^B BiCMOS architecture, which balances speed and power efficiency.

Does SN74ABT377ADWR support 3.3-V operation?

No, SN74ABT377ADWR is specified only for 4.5 V to 5.5 V supply operation and is not guaranteed to function correctly at 3.3 V. Its input thresholds, output drive strength, and timing parameters are optimized for 5-V TTL/CMOS systems. For 3.3-V applications, consider the pin-compatible SN74LVC574APW, though it lacks 5-V tolerance and requires level shifting when interfacing with legacy 5-V circuitry.

What is the purpose of the CLKEN pin on SN74ABT377ADWR?

The CLKEN pin on SN74ABT377ADWR is an active-low clock enable that gates all eight flip-flop updates: data transfers to Q outputs occur only on the rising edge of CLK when CLKEN is low. When CLKEN is high, the outputs retain their previous state regardless of CLK activity. This feature allows precise control over data capture windows and prevents unintended state changes during system initialization or fault recovery sequences in the SN74ABT377ADWR.

Is SN74ABT377ADWR RoHS compliant?

Yes, SN74ABT377ADWR is RoHS compliant, with NiPdAu lead finish and compliance verified per EU Directive 2011/65/EU. It carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for lead-free reflow up to 260°C peak temperature. The part marking "ABT377A" and packaging in 2000-piece large tape-and-reel (reel width 24.4 mm) further confirm its production-grade RoHS status.

How does SN74ABT377ADWR handle unused inputs?

Unused inputs on SN74ABT377ADWR must be held static - either tied to VCC or GND - to prevent floating nodes that could cause excessive supply current, oscillation, or ESD susceptibility. This requirement applies to all inputs including CLKEN, CLK, and any unconnected D inputs. The datasheet explicitly states this in Note 3 under Recommended Operating Conditions, and failure to comply may degrade noise immunity or increase ICC in the SN74ABT377ADWR.