Texas Instruments SN74BCT574DWR

Overview

SN74BCT574DWR from Texas Instruments is an octal transparent D-type flip-flop with 3-state outputs, designed for bus interface and data latching in 5-V digital systems. It operates across 4.5 V to 5.5 V, features edge-triggered clocking on CLK↑, supports 77 MHz maximum clock frequency, delivers ±64 mA output drive, and uses BiCMOS technology to minimize ICCZ quiescent current.

For engineers reviewing the SN74BCT574DWR datasheet, SN74BCT574DWR pinout, SN74BCT574DWR application, or SN74BCT574DWR equivalent, this device is selected for high-drive, low-impedance bus buffering, I/O port expansion, and bidirectional data path control where timing-critical parallel register loading and output isolation are required.

Technical Context

The SN74BCT574DWR implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with each Q output reflecting the corresponding D input state at clock transition. Its 3-state outputs are controlled by a dedicated OE input that does not affect internal latch operation - enabling data retention or new loading while outputs remain high-impedance.

This BiCMOS device combines bipolar output drivers for high current (±64 mA) and CMOS input logic for low power consumption and ESD robustness (2000-V HBM). Propagation delays are tightly specified: tPLH/tPHL ≤ 10 ns, tPZH/tPZL ≤ 10.4 ns, and tPHZ/tPLZ ≤ 7.5 ns at VCC = 5 V and CL = 50 pF.

Key Specifications

Pinout & Package

SN74BCT574DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, with 1.27 mm pitch and 2.65 mm max height. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Compared with SN74LS574N and SN74ACT574DW, the SN74BCT574DWR uniquely balances high-current drive, industrial ESD resilience, and 77 MHz performance - making it optimal for demanding bus-buffering roles where signal integrity and load-driving capability are critical.

Availability

SN74BCT574DWR is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller I/O expansion, memory address latching, and digital test equipment data capture requiring stable component supply and long-term production continuity.

Supply support for SN74BCT574DWR 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 experience in high-reliability industrial and automotive ICs.

The SN74BCT574DWR belongs to TI's BCT logic family, engineered specifically for high-drive, low-noise 5-V bus interfacing - combining bipolar output strength with CMOS input efficiency to replace discrete buffer solutions.

FAQ

What is the operating voltage range for SN74BCT574DWR?

The SN74BCT574DWR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL and CMOS logic families while maintaining sufficient noise margin and stable output drive performance. Operation outside this range may cause functional failure or damage, as absolute maximum ratings specify −0.5 V to 7 V for VCC but do not guarantee operation.

How does the OE pin function on SN74BCT574DWR?

The OE (output enable) pin on SN74BCT574DWR is an active-low control that places all eight Q outputs into high-impedance state when asserted high, regardless of CLK or D input states. It does not affect internal flip-flop operation - data can be latched or retained while outputs are disabled. For reliable power-up high-Z behavior, TI recommends tying OE to VCC via a pullup resistor.

What is the maximum clock frequency supported by SN74BCT574DWR?

The SN74BCT574DWR supports a maximum clock frequency of 77 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification is validated by timing parameters including tw ≥ 6.5 ns (minimum pulse width) and tsu ≥ 4.5 ns (setup time), ensuring reliable edge-triggered latching in high-speed synchronous systems.

Does SN74BCT574DWR have ESD protection, and what levels are specified?

Yes, SN74BCT574DWR exceeds JESD22 ESD standards: 2000-V Human-Body Model (HBM), 200-V Machine Model (MM), and 1000-V Charged-Device Model (CDM). These ratings reflect its BiCMOS process design and make it suitable for industrial environments where handling and board-level electrostatic stress are concerns - no external protection diodes are required for typical assembly workflows.

What package type is used for SN74BCT574DWR, and what are its key mechanical features?

SN74BCT574DWR uses a 20-pin SOIC (DW) package: 7.5 mm body width, 12.83 mm length, 2.65 mm max height, 1.27 mm lead pitch, and NiPdAu lead finish. It is RoHS-compliant, rated MSL Level-1 (unlimited floor life), and designed for standard reflow profiles up to 260°C peak. The package drawing is documented as DW0020A per JEDEC MS-013.