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NXP Semiconductors 74HCT534N,652
- Part No.:
- 74HCT534N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT534N,652.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
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Product details
Overview
74HCT534N,652 from NXP Semiconductors (formerly Philips) is an octal D-type flip-flop with positive-edge clock triggering, inverting 3-state outputs, and common output enable. It operates at 5 V, delivers 40 MHz maximum clock frequency, exhibits 13 ns typical propagation delay (CP to Qn), and supports −40 °C to +125 °C ambient operation for bus-oriented digital logic interfacing.
For engineers reviewing the 74HCT534N,652 datasheet, 74HCT534N,652 pinout, 74HCT534N,652 application, or 74HCT534N,652 equivalent, key selection criteria include its inverted output polarity versus 74HCT374, 3-state bus drive capability, TTL-compatible input thresholds, and DIP20 package suitability for legacy PCB layouts and test fixtures.
Technical Context
The 74HCT534N,652 implements eight independent D-type latches synchronized by a shared LOW-to-HIGH clock edge, with each output inverted relative to its corresponding D-input. Its 3-state control is managed solely by the active-low OE pin, which places outputs in high-impedance without affecting internal flip-flop states.
It complies with JEDEC standard no. 7A and matches LSTTL voltage levels while delivering CMOS power efficiency. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V, ensuring robust noise immunity in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-voltage logic buses |
| Max Clock Frequency | 40 MHz at VCC = 5 V, CL = 15 pF - supports high-speed data latching in address/data buffers |
| Propagation Delay | 13 ns typical (CP to Qn) - enables precise timing alignment in synchronous bus architectures |
| Output Drive | ±6 mA sink/source at VOL ≤ 0.26 V / VOH ≥ 3.98 V - sufficient for driving multiple LSTTL loads |
| Input Capacitance | 3.5 pF - minimizes loading on upstream drivers and preserves signal integrity |
| Operating Temperature | −40 °C to +125 °C - qualified for industrial and automotive under-hood applications |
| 3-State Enable Time | 16 ns typical (OE to Qn) - allows fast bus arbitration and multiplexing cycles |
Pinout & Package
74HCT534N,652 uses a plastic dual in-line package (DIP20, SOT146-1) with 300-mil lead spacing, suitable for through-hole prototyping, socket-based testing, and legacy industrial control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state enable | Controls all eight outputs simultaneously; HIGH disables outputs to high-Z without altering stored data |
| 2–9, 12, 15–19 (Q0–Q7) | Inverting 3-state outputs | Each reflects logical NOT of corresponding D-input after clock edge; tri-statable for bus sharing |
| 3–4, 7–8, 13–14, 17–18 (D0–D7) | Data inputs | Independent parallel data paths; sampled on LOW-to-HIGH CP transition meeting setup/hold requirements |
| 10 (GND) | Ground reference | 0 V return path for logic and output current; must be low-impedance for noise control |
| 11 (CP) | Positive-edge clock | Edge-triggered control signal; latches all D-inputs synchronously on rising edge |
| 20 (VCC) | Power supply | +5 V nominal supply; decoupling capacitor required near pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct replacement of non-inverting registers where signal inversion is acceptable or required in bus topology |
| Common output enable | Simplifies system-level bus control with single OE line managing all eight outputs-no per-bit gating logic needed |
| TTL-compatible input thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V supply ensure reliable interfacing with legacy 74LS and 74F families |
| High-temperature operation | Rated up to +125 °C ambient allows use in motor control, power supply monitoring, and industrial PLC modules |
| JEDEC 7A compliance | Guarantees interoperability with industry-standard LSTTL logic families in mixed-signal board designs |
Applications
| Microcontroller Address Latching | Industrial Bus Interface |
|---|---|
Use Scenario: Latching 8-bit address or status bus from an 8051 or similar microcontroller during memory read/write cycles. IC Role / Device Role / Timing Role: Octal D-type register capturing parallel data on rising clock edge; inverted outputs feed directly to external memory or peripheral address lines. Use Value: Eliminates need for discrete inverters when downstream logic expects active-low addressing or complements existing bus polarity. | Use Scenario: Isolating and buffering sensor data lines in a programmable logic controller backplane with shared I/O slots. IC Role / Device Role / Timing Role: 3-state bus transceiver providing controlled bidirectional data flow between CPU and modular I/O cards. Use Value: Enables hot-swappable module support via OE-controlled high-Z state, preventing bus contention during insertion/removal. |
| Digital Test Fixture Control | Legacy System Upgrade |
Use Scenario: Generating synchronized stimulus patterns for boundary-scan or functional testing of PCB assemblies using pattern generators. IC Role / Device Role / Timing Role: Parallel data latch holding test vector bits; clocked by pattern generator's master clock for deterministic timing. Use Value: 13 ns propagation delay and 40 MHz max frequency allow sub-25 ns timing resolution in automated test equipment. | Use Scenario: Replacing obsolete 74LS534 in aging instrumentation or telecom line cards requiring drop-in logic upgrades. IC Role / Device Role / Timing Role: Pin-compatible CMOS upgrade offering lower power, higher noise immunity, and extended temperature range. Use Value: Maintains identical DIP20 footprint and pinout while improving reliability and reducing thermal load in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT374N,652 | Identical pinout and timing, but non-inverting outputs | Used where bus polarity must match upstream logic without inversion | Select when output inversion is undesirable and external inverters are not feasible |
| SN74HCT534N | Same function and pinout; TI-manufactured with identical electrical specs per datasheet | No functional difference; used in TI-centric BOMs or dual-sourcing strategies | Choose for second-source assurance without design or layout changes |
Compared with 74HCT374N,652, the 74HCT534N,652 provides inverted outputs enabling direct interface to active-low peripherals; compared with SN74HCT534N, it offers identical performance with NXP qualification and traceability for European industrial programs.
Availability
74HCT534N,652 is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment upgrades, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT534N,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 formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The 74HCT534N,652 belongs to NXP's HCT logic family, designed specifically to provide TTL-compatible CMOS devices with enhanced noise immunity, wide operating temperature range, and pin-for-pin replacements for legacy 74LS logic in industrial and automotive applications.
FAQ
What is the primary functional difference between 74HCT534N,652 and 74HCT374N,652?
The 74HCT534N,652 features inverting 3-state outputs, whereas the 74HCT374N,652 has non-inverting outputs. Both share identical pinout, clocking behavior, and electrical specifications. This inversion means that when D0 = HIGH, Q0 = LOW on the 74HCT534N,652 - a critical distinction when interfacing with downstream logic expecting complementary polarity. Designers must verify signal polarity requirements before substituting either device.
Does 74HCT534N,652 support 3.3 V operation?
No, the 74HCT534N,652 is specified only for 4.5 V to 5.5 V supply operation and is not guaranteed to function correctly at 3.3 V. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive characteristics are optimized for 5 V TTL compatibility. For 3.3 V systems, consider the 74LVC534A or similar LVCMOS-compatible octal flip-flops instead of the 74HCT534N,652.
What is the minimum clock pulse width required for reliable operation of 74HCT534N,652?
The 74HCT534N,652 requires a minimum clock pulse width of 23 ns HIGH and 23 ns LOW at Tamb = 25 °C and VCC = 5 V. At full temperature range (−40 °C to +125 °C) and VCC = 4.5 V, the minimum HIGH/LOW pulse width increases to 35 ns. These values ensure proper metastability avoidance and reliable edge detection - violating them may cause missed clocks or inconsistent latching in the 74HCT534N,652.
Can the 74HCT534N,652 outputs drive multiple LSTTL inputs directly?
Yes, the 74HCT534N,652 can drive up to 10 LSTTL inputs per output, based on its ±6 mA output drive capability at VOH ≥ 3.98 V and VOL ≤ 0.26 V (VCC = 4.5 V). This meets the LSTTL fan-out requirement of 20 µA HIGH-level input current and 0.4 mA LOW-level input current. However, total capacitive load should remain ≤ 50 pF to maintain timing integrity in the 74HCT534N,652.
Is 74HCT534N,652 RoHS compliant and halogen-free?
Yes, the 74HCT534N,652 manufactured by NXP conforms to RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The DIP20 package (SOT146-1) uses lead-free matte tin plating and environmentally compliant molding compound. Full compliance documentation, including substance declarations and test reports, is available upon request for the 74HCT534N,652.
74HCT534N,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, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 30ns @ 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
74HCT534N,652 FAQ
1.How can I place an order for 74HCT534N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT534N,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 74HCT534N,652 reliable?
The price and inventory of 74HCT534N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT534N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT534N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT534N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT534N,652?
74HCT534N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT534N,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 74HCT534N,652?
For technical support, including 74HCT534N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT534N,652 requirements.
6.How does Aetrix verify that 74HCT534N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT534N,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 74HCT534N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT534N,652?
All 74HCT534N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT534N,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 74HCT534N,652 part is unused and in its original packaging.
Return procedure for 74HCT534N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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