Texas Instruments SN74ABT377ADBR

Overview

SN74ABT377ADBR 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, 5-V operation, 150-MHz maximum clock frequency, –32-mA/64-mA high-drive outputs, and operates from –40°C to 85°C. It is used in buffer registers, shift registers, and pattern generators in industrial control and communications interface logic.

For engineers reviewing the SN74ABT377ADBR datasheet, SN74ABT377ADBR pinout, SN74ABT377ADBR application, or SN74ABT377ADBR equivalent, key selection criteria include clock-enable control timing (3-ns setup/1.2-ns hold), output drive strength, ground-bounce performance (<1 V VOLP), and SSOP-20 package compatibility with dense PCB layouts.

Technical Context

This device implements eight independent D-type latches synchronized to the rising edge of CLK when CLKEN is low. Its EPIC-II^B BiCMOS process enables low power dissipation while maintaining TTL-compatible input thresholds and high-current CMOS outputs.

Each flip-flop exhibits 2.2–6.5 ns propagation delay (t_PLH/t_PHL) at 5 V and CL = 50 pF, with setup time of 2.0 ns (data) and 3.0 ns (CLKEN), and hold time of 1.8 ns (data) and 1.2 ns (CLKEN). Latch-up immunity exceeds 500 mA per JEDEC JESD-17.

Key Specifications

Pinout & Package

SN74ABT377ADBR is housed in a 20-pin Shrink Small-Outline Package (SSOP-DB), 7.4 mm × 5.3 mm footprint, 2.0 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT377N and 74LVX374M, SN74ABT377ADBR uniquely combines 5-V tolerance, integrated clock enable, 150-MHz operation, and high-current drive - making it optimal for industrial 5-V systems requiring robust, gated register staging without external logic.

Availability

SN74ABT377ADBR is available at Aetrix Electronics and suitable for industrial PLCs, communications interface modules, automated test equipment, and legacy bus adapters requiring stable component supply and long-term manufacturability.

Supply support for SN74ABT377ADBR 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 logic families.

SN74ABT377ADBR belongs to the ABT-series advanced bi-directional bus transceivers and registers, engineered for high-speed, low-noise, 5-V industrial and instrumentation applications demanding precise timing and strong drive capability.

FAQ

What is the maximum clock frequency supported by SN74ABT377ADBR?

SN74ABT377ADBR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C, CL = 50 pF). This rating is confirmed across its full industrial temperature range (–40°C to +85°C), with timing parameters validated per the SCBS156E datasheet revision January 1997. The SN74ABT377ADBR achieves this using EPIC-II^B BiCMOS technology to minimize propagation delay (t_PLH/t_PHL = 2.2–6.5 ns).

Does SN74ABT377ADBR have a clock enable pin, and how does it function?

Yes, SN74ABT377ADBR includes an active-low clock enable (CLKEN) input (Pin 1). When CLKEN is high, the clock signal is blocked and Q outputs retain their previous state regardless of CLK transitions. Only when CLKEN is low does the rising edge of CLK transfer D-input data to Q outputs. This behavior is explicitly defined in the FUNCTION TABLE and prevents false clocking - a key design feature confirmed in the logic diagram and timing specifications of the SN74ABT377ADBR datasheet.

What package type is used for SN74ABT377ADBR, and what are its key mechanical dimensions?

SN74ABT377ADBR uses a 20-pin Shrink Small-Outline Package (SSOP-DB), per JEDEC MO-150. Its body measures 7.4 mm × 5.3 mm, height ≤2.0 mm, with 0.65 mm lead pitch and gull-wing leads. Pin 1 index area is marked on the top surface, and the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating. These dimensions are specified in TI's DB0020A package outline drawing and verified in the PACKAGE OPTION ADDENDUM.

What are the absolute maximum ratings for SN74ABT377ADBR supply voltage and output current?

The absolute maximum supply voltage (VCC) for SN74ABT377ADBR is –0.5 V to 7 V. Absolute maximum output sink current (IOL) is 128 mA per output, and maximum output source current (IOH) is –96 mA - though recommended operating conditions specify –32 mA IOH and 64 mA IOL for reliable long-term operation. These limits are documented in the "Absolute Maximum Ratings" table of the SN74ABT377ADBR datasheet (SCBS156E, p.3), and exceed JEDEC standards for latch-up immunity and ESD robustness.

Is SN74ABT377ADBR compatible with standard TTL input thresholds?

Yes, SN74ABT377ADBR is fully TTL-compatible: VIH = 2.0 V (min), VIL = 0.8 V (max) at VCC = 4.5–5.5 V. Its inputs meet standard TTL voltage thresholds and can be driven directly by 74LS, 74F, and other legacy 5-V logic families without level shifting. This compatibility is explicitly stated in the "Recommended Operating Conditions" table (p.4) and verified by input clamp current (IIK = –18 mA) and VIH/VIL test conditions in the SN74ABT377ADBR electrical characteristics section.