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Texas Instruments SN74HCT574DWG4
- Part No.:
- SN74HCT574DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT574DWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,502
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Product details
Overview
SN74HCT574DWG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state noninverting outputs, designed for bus interface and data latching in 5V TTL-compatible digital systems. It operates from 4.5V to 5.5V, delivers ±6mA output drive, features 22ns typical propagation delay, and supports 24MHz maximum clock frequency at 5V. It is used in I/O port expansion and bidirectional bus driving applications.
For engineers reviewing the SN74HCT574DWG4 datasheet, SN74HCT574DWG4 pinout, SN74HCT574DWG4 application, or SN74HCT574DWG4 equivalent, key selection criteria include its 3-state bus-driving capability, TTL-compatible inputs, 20-pin SOIC (DW) package, and guaranteed operation across −40°C to +85°C industrial temperature range.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the low-to-high transition of CLK. Data is latched synchronously, and outputs are controlled via two independent 3-state enable inputs (1OE and 2OE), allowing selective bus isolation per half-bank.
The logic architecture supports high-impedance output states without affecting internal register retention, enabling concurrent data loading and bus release. Its input thresholds (VIH = 2V, VIL = 0.8V) and output drive (VOH ≥ 3.7V at −6mA, VOL ≤ 0.33V at 6mA) ensure robust noise margin and direct compatibility with LSTTL loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - Ensures stable operation in standard 5V digital rails with ±10% tolerance. |
| Propagation Delay (tpd) | 22ns typical at VCC = 5V, CL = 50pF - Enables reliable timing in 24MHz synchronous bus interfaces. |
| Output Drive | ±6mA at VCC = 5V - Directly drives up to 15 LSTTL loads without external buffers. |
| Input Compatibility | TTL-voltage compatible (VIH = 2V, VIL = 0.8V) - Interoperates seamlessly with legacy TTL and CMOS logic families. |
| Quiescent Current (ICC) | 80μA max - Minimizes static power in always-on control and interface circuits. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded and automation applications. |
| 3-State Enable Logic | Active-low OE (1OE, 2OE) - Allows independent control of two 4-bit output groups for flexible bus partitioning. |
Pinout & Package
SN74HCT574DWG4 is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.80mm × 7.50mm), with gull-wing leads and standard JEDEC MS-013 footprint. The pinout follows a bus-structured layout optimized for PCB routing efficiency in parallel data paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable inputs | Independently disable lower/upper 4-bit output banks; no effect on internal latch state. |
| CLK | Clock input (Pin 11) | Edge-sensitive input triggering all eight flip-flops simultaneously on rising edge. |
| D1–D8 | Data inputs (Pins 2,4,6,8,13,15,17,19) | Asynchronous data inputs aligned to internal D-latch structure; TTL-compatible voltage thresholds. |
| Q1–Q8 | 3-state outputs (Pins 3,5,7,9,12,14,16,18) | Noninverting buffered outputs capable of high-impedance state when OE asserted. |
| VCC (Pin 20), GND (Pin 10) | Power supply terminals | Requires local 0.1μF bypass capacitor at VCC to suppress switching noise and ensure timing stability. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latching with edge-triggered clock | Synchronizes eight parallel data bits on single CLK↑ edge-ideal for register file and pipeline stage capture. |
| Independent dual 3-state output enables | 1OE controls Q1–Q4; 2OE controls Q5–Q8-enables split-bus arbitration and memory-mapped I/O segmentation. |
| High-current 3-state outputs | ±6mA drive strength ensures clean signal integrity into loaded buses without external drivers or pull-ups. |
| TTL-compatible input thresholds | VIH = 2V / VIL = 0.8V guarantees interoperability with 74LS, 74F, and other legacy TTL families. |
| Low quiescent power | 80μA max ICC reduces standby current in battery-backed or energy-constrained control modules. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Parallel Bus Interface |
|---|---|
Use Scenario: Adding 8-bit parallel input/output capability to a microcontroller with limited GPIO resources in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer, isolating MCU pins from field-side transients while synchronizing data transfers on system clock edges. Use Value: Enables deterministic read/write timing with 22ns tpd and eliminates need for discrete level-shifting or buffering components. |
Use Scenario: Connecting an 8-bit microprocessor data bus to peripheral devices such as LCD controllers or ADCs requiring synchronized data capture. IC Role / Device Role / Timing Role: Serves as a transparent data latch that holds bus values during address decoding delays and peripheral setup times. Use Value: Provides glitch-free data hold with 5ns minimum hold time (th) and supports 24MHz bus clock rates under industrial conditions. |
| Legacy System Bus Buffering | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing modern FPGA-based controllers to legacy 5V TTL backplanes or ISA-style expansion slots. IC Role / Device Role / Timing Role: Functions as a bidirectional bus driver with 3-state control, allowing shared bus arbitration between master and slave devices. Use Value: Delivers ±6mA drive and TTL-compatible thresholds to maintain signal fidelity across long traces and multiple loads. |
Use Scenario: Generating precise, synchronized 8-bit digital stimulus patterns in automated test equipment for IC validation. IC Role / Device Role / Timing Role: Latches pattern data from a shift register or memory block on each CLK edge, then presents stable outputs to DUT pins. Use Value: Guarantees 22ns tpd and 5ns th to meet tight setup/hold windows required for high-speed digital testing. |
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 |
|---|---|---|---|
| SN74HCT374DW | Identical pinout and function but uses single OE input instead of dual OE (1OE/2OE); same 20-pin SOIC package. | Lacks independent half-bank control-requires external gating if segmented bus enable is needed. | Select SN74HCT374DW only when unified output enable suffices and board layout rework is acceptable. |
| 74ACT574PC | Higher speed (tpd ≈ 9ns), wider VCC range (4.5V–5.5V), but higher ICC (2mA typical) and not TTL-input compatible (CMOS thresholds). | Better for high-frequency designs where timing margin is critical, but requires level translation if interfacing with TTL sources. | Choose 74ACT574PC when >24MHz operation is required and input sources are CMOS-compatible. |
Compared with SN74HCT374DW and 74ACT574PC, SN74HCT574DWG4 uniquely balances TTL compatibility, dual 3-state control, and industrial temperature support-making it optimal for retrofitting legacy systems and mixed-signal industrial interfaces where predictability and interoperability outweigh raw speed.
Availability
SN74HCT574DWG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller parallel bus interface, and legacy system bus buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCT574DWG4 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 90 years of innovation in industrial, automotive, and communications markets.
SN74HCT574DWG4 belongs to TI's HCT logic family-designed specifically for TTL-compatible 5V systems requiring low power, robust noise immunity, and seamless integration with legacy digital infrastructure.
FAQ
What is the operating voltage range for SN74HCT574DWG4?
The SN74HCT574DWG4 operates from 4.5V to 5.5V. This range ensures compatibility with standard 5V digital supply rails while accommodating typical line regulation tolerances. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings table of the official datasheet.
Does SN74HCT574DWG4 support independent control of its output banks?
Yes, SN74HCT574DWG4 provides two independent active-low output enables: 1OE controls outputs Q1–Q4, and 2OE controls Q5–Q8. This allows segmented bus access-critical for memory-mapped I/O or multi-peripheral arbitration-without affecting internal latch states or requiring additional logic.
What is the maximum clock frequency supported by SN74HCT574DWG4?
SN74HCT574DWG4 supports up to 24MHz maximum clock frequency at VCC = 5V and TA = 85°C. At 25°C and VCC = 5.5V, fmax reaches 27MHz. These values are validated under CL = 50pF load conditions and assume proper PCB layout and decoupling per TI's application guidelines.
Can SN74HCT574DWG4 directly drive LSTTL loads?
Yes, SN74HCT574DWG4 can directly drive up to 15 LSTTL loads due to its ±6mA output drive capability at 5V. Its VOH ≥ 3.7V (at −6mA) and VOL ≤ 0.33V (at 6mA) meet LSTTL VIH/VIL margins with sufficient noise immunity, eliminating need for external buffer stages in most bus applications.
Is SN74HCT574DWG4 pin-compatible with other 20-pin SOIC octal latches?
SN74HCT574DWG4 shares the same 20-pin SOIC (DW) footprint and core pin functions (CLK, D/Q, OE, VCC, GND) with SN74HCT374DW, but differs in OE configuration: SN74HCT574DWG4 uses dual OE (1OE/2OE), whereas SN74HCT374DW uses a single OE. Pin mapping matches JEDEC MS-013, but functional equivalence requires verification of enable logic requirements.
SN74HCT574DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT574DWG4 FAQ
1.How can I place an order for SN74HCT574DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT574DWG4 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 SN74HCT574DWG4 reliable?
The price and inventory of SN74HCT574DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT574DWG4 is usually 5 days.
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4.How is shipping managed for SN74HCT574DWG4?
SN74HCT574DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT574DWG4 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 SN74HCT574DWG4?
For technical support, including SN74HCT574DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT574DWG4 requirements.
6.How does Aetrix verify that SN74HCT574DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT574DWG4 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 SN74HCT574DWG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT574DWG4?
All SN74HCT574DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT574DWG4, 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 SN74HCT574DWG4 part is unused and in its original packaging.
Return procedure for SN74HCT574DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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