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Texas Instruments SN74HCT574DGSR
- Part No.:
- SN74HCT574DGSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74HCT574DGSR.pdf
- Description:
- OCTAL EDGE-TRIGGERED D-TYPE FLIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,385
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Product details
Overview
SN74HCT574DGSR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state noninverting outputs, designed for bus interfacing in 5V digital systems. It operates from 4.5V to 5.5V, delivers ±6mA output drive, features 22ns typical propagation delay (tpd), and draws ≤80μA ICC - enabling direct LSTTL bus driving in I/O ports and buffer registers.
For engineers reviewing the SN74HCT574DGSR datasheet, SN74HCT574DGSR pinout, SN74HCT574DGSR application, or SN74HCT574DGSR equivalent, key selection criteria include its VSSOP-20 package footprint, 3-state bus-hold capability, TTL-compatible inputs, 8-bit synchronous latch behavior, and industrial temperature range (–40°C to +125°C).
Technical Context
This device implements eight independent D-type latches triggered on the rising edge of CLK, with dual independent 3-state output enables (1OE and 2OE) controlling two groups of four outputs each. Its logic-level inputs are TTL-voltage compatible (VIH = 2V min, VIL = 0.8V max), and outputs maintain rail-to-rail swing under load.
The SN74HCT574DGSR uses CMOS HCT technology for TTL input compatibility while retaining low power consumption and high noise immunity. Its bus-structured pinout and high-current 3-state outputs eliminate need for external pull-ups or interface buffers in bidirectional data bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS logic rails and stable operation across industrial voltage tolerances. |
| Propagation Delay (tpd) | 22ns typical at VCC = 5V, CL = 50pF - supports reliable 20+ MHz clock rates in synchronous register applications. |
| Output Drive | ±6mA at VCC = 5V - directly drives up to 15 LSTTL loads without external buffers, reducing BOM count and board space. |
| Input Current | ≤1μA max - minimizes loading on upstream logic and enables fan-out scalability in dense bus architectures. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and extended-temperature embedded systems. |
| Quiescent Current (ICC) | ≤80μA max - enables low-static-power operation in always-on or battery-backed register storage functions. |
Pinout & Package
VSSOP-20 (DGS) package: 5.1mm × 4.9mm body size, 1.1mm max height, thermal pad exposed on underside for enhanced heat dissipation and PCB-level thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable inputs | Independently disable two 4-bit output groups into high-impedance state - enables time-multiplexed bus sharing and prevents contention. |
| CLK | Clock input | Rising-edge-triggered latch control - synchronizes all eight D inputs to Q outputs simultaneously for coherent register updates. |
| D1–D8 | Data inputs | Eight asynchronous parallel data inputs accepting TTL-level signals - accepts data prior to clock edge for setup-time compliance. |
| Q1–Q8 | 3-state outputs | Noninverting buffered outputs with rail-to-rail swing - drive buses directly or interface with downstream logic without level-shifting. |
| VCC, GND | Power supply pins | Single 5V supply with dedicated ground - requires local 0.1μF bypass capacitor per VCC pin for noise suppression and switching stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes trace crossovers and simplifies PCB layout for 8-bit data paths - reduces signal integrity risk in high-density routing. |
| TTL-compatible inputs | Accepts standard TTL voltage thresholds (VIH ≥ 2V, VIL ≤ 0.8V) - interoperates seamlessly with legacy 74LS/74ALS logic without level translators. |
| High-current 3-state outputs | ±6mA drive strength per output - eliminates need for external bus transceivers in medium-load industrial backplanes and control interfaces. |
| Low power consumption | 80μA max ICC - enables use in power-constrained subsystems such as sensor hubs and standby-mode I/O expanders. |
| Industrial temperature range | –40°C to +125°C operation - supports deployment in engine control units, motor drives, and factory automation equipment. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Latching sensor inputs and actuator command outputs in modular programmable logic controller racks. IC Role / Device Role / Timing Role: Octal D-flip-flop acting as synchronized input capture and output hold register with 3-state bus isolation. Use Value: Enables deterministic sampling of analog-to-digital converter results and safe updating of relay driver states without bus contention during reconfiguration. |
Use Scenario: Interfacing microcontroller GPIOs to distributed door lock, window lift, and lighting drivers via shared CAN/LIN sub-bus. IC Role / Device Role / Timing Role: Bidirectional bus driver and status register for peripheral control signals in multi-node vehicle networks. Use Value: Provides galvanic isolation between MCU and high-current loads while supporting hot-swap-safe 3-state control during firmware updates. |
| Test Equipment Digital Pattern Generator | Medical Diagnostic Data Acquisition |
Use Scenario: Generating precise, synchronized stimulus waveforms for IC functional testing and boundary-scan validation. IC Role / Device Role / Timing Role: High-speed parallel data latch delivering deterministic timing edges to DUT pins under FPGA control. Use Value: Delivers sub-25ns edge fidelity and low skew across all eight channels - critical for setup/hold margin verification in high-speed digital test fixtures. |
Use Scenario: Buffering real-time ADC sample streams from multi-channel ECG or EEG front-ends before DMA transfer to processor memory. IC Role / Device Role / Timing Role: Synchronous sample-and-hold register decoupling analog acquisition timing from digital processing latency. Use Value: Prevents metastability and data corruption during burst transfers by providing glitch-free, clock-aligned data staging with zero-latency enable control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374DGVR | Same HCT family, identical 3-state D-flip-flop function but with single OE pin (not dual OE); otherwise matching timing, drive, and voltage specs. | Lacks independent control of two 4-bit output groups - unsuitable where time-multiplexed bus arbitration is required. | Select when simplified enable logic suffices and PCB layout favors uniform pinout across multiple register types. |
| 74LVX574M | Lower-voltage LVX family (2.7–3.6V operation); 3.3V-only compatible; 5V-tolerant inputs but not 5V-output capable. | Requires level translation for 5V bus environments; incompatible with direct LSTTL loading due to reduced output drive (±12mA @ 3.3V vs ±6mA @ 5V). | Choose only for 3.3V-native systems needing lower power and higher speed - not a drop-in replacement for SN74HCT574DGSR in 5V designs. |
Compared with SN74HCT374DGVR and 74LVX574M, the SN74HCT574DGSR uniquely supports dual independent output enables in a 5V-tolerant, TTL-compatible bus interface - making it optimal for industrial backplane and automotive sub-systems requiring flexible bus arbitration and legacy logic interoperability.
Availability
SN74HCT574DGSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, test equipment pattern generators, and medical diagnostic data acquisition systems requiring stable component supply and long-term lifecycle support.
Supply support for SN74HCT574DGSR 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74HCT574DGSR belongs to TI's 74HCT logic family - engineered for TTL-compatible interfacing in 5V systems where robust noise immunity, predictable timing, and bus-driving capability are essential for industrial and automotive control applications.
FAQ
What is the maximum clock frequency supported by the SN74HCT574DGSR?
The SN74HCT574DGSR supports a maximum clock frequency of 24 MHz at VCC = 4.5V and TA = –40°C to +85°C, and up to 27 MHz at VCC = 5.5V under the same conditions. These values are specified in the timing requirements table and assume proper load capacitance (CL ≤ 50 pF) and signal integrity.
Does the SN74HCT574DGSR require external pull-up resistors on its outputs?
No, the SN74HCT574DGSR does not require external pull-up resistors. Its 3-state outputs provide active high/low drive (±6mA at 5V) and high-impedance off-state, enabling direct connection to shared buses without passive termination - a core design feature confirmed in the device description and electrical characteristics.
Can the SN74HCT574DGSR operate reliably at 125°C junction temperature?
Yes, the SN74HCT574DGSR is rated for operation from –40°C to +125°C ambient temperature, and its absolute maximum junction temperature is 150°C. With proper PCB thermal design - including use of the exposed thermal pad per TI's SLMA002 guidelines - sustained operation at +125°C ambient is fully supported.
How many output enable pins does the SN74HCT574DGSR have, and what is their function?
The SN74HCT574DGSR has two independent active-low output enable pins: 1OE (pin 1) controls Q1–Q4, and 2OE (pin 19) controls Q5–Q8. This dual-enable architecture allows time-multiplexed access to two 4-bit data segments on the same bus - a verified functional mode documented in the device's function table and detailed description.
Is the SN74HCT574DGSR pin-compatible with other packages of the same part number?
No - the SN74HCT574DGSR (VSSOP-20) is not pin-compatible with SN74HCT574DBR (SSOP-20), SN74HCT574DWR (SOIC-20), or other package variants. While all share identical logic functionality and pin *functions*, their physical pinouts differ significantly due to distinct package geometries and lead arrangements - confirmed by TI's mechanical drawings and package comparison tables.
SN74HCT574DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 47ns @ 5.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74HCT574DGSR FAQ
1.How can I place an order for SN74HCT574DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT574DGSR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74HCT574DGSR reliable?
The price and inventory of SN74HCT574DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT574DGSR is usually 5 days.
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SN74HCT574DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT574DGSR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74HCT574DGSR?
For technical support, including SN74HCT574DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT574DGSR requirements.
6.How does Aetrix verify that SN74HCT574DGSR is sourced from the original manufacturer or authorized distributors?
All SN74HCT574DGSR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74HCT574DGSR meets industry standards.
7.What is the process for return or replacement of SN74HCT574DGSR?
All SN74HCT574DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT574DGSR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74HCT574DGSR part is unused and in its original packaging.
Return procedure for SN74HCT574DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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