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NXP Semiconductors 74HCT574N,652
- Part No.:
- 74HCT574N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT574N,652.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,390
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Product details
Overview
74HCT574N,652 from NXP Semiconductors is an octal D-type positive-edge-triggered flip-flop with 3-state non-inverting outputs, designed for bus-oriented digital systems. It operates across −40 °C to +125 °C, features 20-pin DIP20 package, and provides 8-bit register functionality with common clock (CP) and output enable (OE) inputs. It is used in microcontroller I/O expansion, data latching in industrial control logic, and address/data bus isolation.
For engineers reviewing the 74HCT574N,652 datasheet, 74HCT574N,652 pinout, 74HCT574N,652 application, or 74HCT574N,652 equivalent, key selection criteria include its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), 3-state output control timing (ten = 19 ns typ, tdis = 16 ns typ at VCC = 4.5 V), and JEDEC-compliant DIP20 mechanical footprint.
Technical Context
The 74HCT574N,652 implements eight independent D-type latches synchronized to the LOW-to-HIGH transition of CP, with set-up time (tsu = 12 ns typ) and hold time (th = 5 ns min) defined relative to that edge. Its OE input controls all eight outputs simultaneously, enabling high-impedance OFF-state without affecting internal flip-flop states.
It belongs to the 74HCT family, ensuring compatibility with standard TTL logic levels while retaining CMOS power efficiency. Input clamping current exceeds ±20 mA, and ESD protection meets HBM JESD22-A114F (>2000 V) and MM JESD22-A115-A (>200 V) standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible CMOS with 4.5–5.5 V supply and standard TTL input thresholds |
| Function | Octal D-type positive-edge-triggered register with 3-state non-inverting outputs |
| Propagation Delay | 18 ns typical (CP to Qn, VCC = 4.5 V, CL = 50 pF) - determines maximum synchronous data throughput |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures interoperability with 5 V TTL and mixed-voltage systems |
| Operating Temperature | −40 °C to +125 °C - supports industrial and extended-temperature embedded applications |
| Package | DIP20 (SOT146-1), 300-mil width - through-hole mounting compatible with legacy PCBs and prototyping |
| Output Drive | ±6 mA at VOH/VOL (VCC = 4.5 V) - sufficient to drive multiple TTL loads or one CMOS load |
Pinout & Package
74HCT574N,652 uses a plastic dual in-line package (DIP20, SOT146-1) with 300-mil body width and through-hole leads. Pin spacing conforms to JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | 3-state output enable (active LOW) | Asserting LOW enables Q[0:7] outputs; HIGH places all outputs in high-impedance state without altering stored data |
| 2–9 (D0–D7) | Data inputs | Individual asynchronous inputs latched on rising edge of CP; accept TTL-level signals |
| 10 (GND) | Ground reference | 0 V return path for all internal circuitry and I/O; must be low-impedance for noise immunity |
| 11 (CP) | Clock input | Positive-edge-triggered control signal; data sampled only on LOW-to-HIGH transition |
| 12–19 (Q0–Q7) | 3-state non-inverting outputs | Reflect D-input values when OE = LOW; tri-stated when OE = HIGH for bus sharing |
| 20 (VCC) | Power supply | +4.5 V to +5.5 V supply rail; decoupling capacitor required near pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| 3-state non-inverting outputs | Enables bidirectional bus arbitration in shared-data-path systems without external direction control logic |
| JEDEC-standard pin compatibility | Direct replacement for LS-TTL 74LS374 in existing designs, simplifying upgrade paths |
| TTL-compatible input thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V allow seamless interfacing with legacy TTL outputs |
| High ESD robustness | HBM > 2000 V and MM > 200 V reduce risk of field failure during handling or board assembly |
| Extended temperature range | −40 °C to +125 °C rating supports deployment in motor drives, power supplies, and outdoor electronics |
Applications
| Microcontroller I/O Expansion | Industrial Bus Isolation |
|---|---|
Use Scenario: Expanding GPIO count of an 8-bit MCU by latching parallel data from port pins into 74HCT574N,652 before reading. IC Role / Device Role / Timing Role: Acts as an 8-bit input latch synchronized to MCU's read strobe, decoupling slow software polling from fast peripheral timing. Use Value: Enables reliable capture of transient sensor or encoder signals without requiring dedicated MCU hardware timers or interrupts. | Use Scenario: Isolating a shared address/data bus between two microcontrollers operating at different clock domains. IC Role / Device Role / Timing Role: Provides controlled, edge-triggered data staging with 3-state outputs managed via OE to prevent bus contention. Use Value: Eliminates need for complex arbitration logic or bus transceivers, reducing BOM cost and PCB area. |
| Legacy System Data Capture | PLC Input Module Buffering |
Use Scenario: Capturing parallel status bits from electromechanical relays or discrete sensors in retrofit industrial panels. IC Role / Device Role / Timing Role: Serves as a noise-immune, level-shifted interface between 24 V DC inputs (via optocouplers) and 5 V logic. Use Value: Tolerates slow input rise/fall times and provides clean, synchronized sampling aligned to system clock. | Use Scenario: Buffering 8-channel digital inputs in a modular PLC backplane where modules share a common data bus. IC Role / Device Role / Timing Role: Latches real-time field input states on a global scan clock edge, then presents them to the CPU via OE-controlled bus access. Use Value: Ensures deterministic input sampling across all channels within a single PLC scan cycle, improving control loop consistency. |
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 |
|---|---|---|---|
| 74HCT374N,652 | Different pinout: Q[0:7] and D[0:7] swapped; identical electrical specs and function | Requires PCB layout revision due to non-matching pin mapping; not drop-in | Select only if redesigning for optimized trace routing or if sourcing constraints require this variant |
| SN74HCT574N | Same function, pinout, and specs; manufactured by Texas Instruments instead of NXP | No functional or mechanical differences; qualified for same industrial temp range | Preferred when dual-sourcing or TI-based supply chain alignment is required |
Compared with 74HCT574N,652, the 74HCT374N,652 demands PCB rework due to incompatible pin assignment despite identical logic behavior, whereas SN74HCT574N offers full form-fit-function equivalence with alternate manufacturing origin.
Availability
74HCT574N,652 is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment upgrades, and microcontroller peripheral expansion requiring stable component supply over extended product lifecycles.
Supply support for 74HCT574N,652 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HCT574N,652 belongs to NXP's legacy logic portfolio, engineered for robust interoperability with TTL systems while delivering CMOS power efficiency and extended temperature reliability.
FAQ
What is the supply voltage range for the 74HCT574N,652?
The 74HCT574N,652 operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V TTL logic families and allows margin for ripple or droop in regulated supplies. Operation outside this window may cause undefined behavior or damage; the absolute maximum rating is 7 V.
Does the 74HCT574N,652 support hot insertion or live bus connection?
No, the 74HCT574N,652 does not support hot insertion. Its inputs lack live-insertion protection circuitry, and applying voltage to any pin before VCC is stable may violate absolute maximum ratings. Always power VCC and GND before asserting signals on CP, OE, or D[0:7] to prevent latch-up or permanent damage to the 74HCT574N,652.
How does the output enable (OE) pin affect internal flip-flop states in the 74HCT574N,652?
The OE pin has no effect on the internal flip-flop states of the 74HCT574N,652. When OE is HIGH, outputs go to high-impedance but stored data remains intact. Only the CP edge updates internal registers; OE solely controls output driver activation. This allows safe bus sharing without unintended data corruption during 74HCT574N,652 output disable periods.
Can the 74HCT574N,652 be used with a 3.3 V microcontroller interface?
No, the 74HCT574N,652 is not 3.3 V compatible. Its VIH minimum is 2.0 V at VCC = 4.5–5.5 V, but it requires VCC = 4.5–5.5 V to operate. Driving its inputs from a 3.3 V MCU violates the recommended operating conditions and risks unreliable switching. Use level-shifting circuitry or select a 74LVC574 variant for true 3.3 V operation.
What is the maximum clock frequency supported by the 74HCT574N,652 at 5 V supply?
At VCC = 5 V and CL = 15 pF, the 74HCT574N,652 supports up to 76 MHz maximum clock frequency. At standard test conditions (CL = 50 pF, VCC = 4.5 V), fmax is 69 MHz. These values assume proper decoupling, controlled trace impedance, and adherence to setup/hold timing - exceeding them risks metastability or data loss in the 74HCT574N,652.
74HCT574N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- 76 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT574N,652 FAQ
1.How can I place an order for 74HCT574N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT574N,652 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 74HCT574N,652 reliable?
The price and inventory of 74HCT574N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT574N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT574N,652?
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4.How is shipping managed for 74HCT574N,652?
74HCT574N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT574N,652 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 74HCT574N,652?
For technical support, including 74HCT574N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT574N,652 requirements.
6.How does Aetrix verify that 74HCT574N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT574N,652 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 74HCT574N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT574N,652?
All 74HCT574N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT574N,652, 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 74HCT574N,652 part is unused and in its original packaging.
Return procedure for 74HCT574N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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