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NXP Semiconductors N74F534D,623
- Part No.:
- N74F534D,623
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F534D,623.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
N74F534D,623 from Philips Semiconductors is an octal D-type flip-flop with inverting 3-state outputs, designed for high-speed bus interface and data latching in TTL-compatible systems. It features positive-edge clock triggering, independent register and output-enable control, 165 MHz maximum clock frequency, 24 mA low-level output drive, and operates at 5 V ±10% over 0°C to +70°C.
For engineers reviewing the N74F534D,623 datasheet, N74F534D,623 pinout, N74F534D,623 application, or N74F534D,623 equivalent, this device supports synchronous data capture with precise setup/hold timing (2.5 ns ts, 0 ns th), fast 3-state enable/disable (2.0–8.5 ns), and robust bus driving capability in industrial control, memory address latching, and microprocessor peripheral interfacing.
Technical Context
The N74F534D,623 implements a fully edge-triggered 8-bit register where each D input transfers to its Q output on the Low-to-High clock transition, with 2.5 ns minimum setup time and zero hold time required. Its dual-control architecture separates register operation (via CP) from output state (via active-Low OE), enabling transparent data flow or high-impedance isolation without affecting internal latch states.
Each of the eight inverting 3-state outputs delivers 24 mA sink current and supports 150-unit-load fan-out in the Low state. The device meets FAST TTL electrical standards with VOH ≥ 2.7 V, VOL ≤ 0.5 V, and ICC = 51 mA typical at VCC = 5 V, ensuring compatibility with legacy 74F and 74AS logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74F FAST TTL - ensures interoperability with 74F/74AS systems and higher noise immunity than standard TTL |
| Max Clock Frequency | 165 MHz - enables high-throughput data sampling in real-time control and communication interfaces |
| Output Drive (IOL) | 24 mA - sufficient to drive heavy capacitive loads and multiple TTL inputs on shared buses |
| Propagation Delay (tPLH/tPHL) | 7.5 ns max - guarantees deterministic timing in synchronous digital pipelines |
| 3-State Enable Time (tPZH/tPZL) | 8.5 ns max - minimizes bus contention windows during output switching |
| Supply Voltage Range | 4.5 V to 5.5 V - accommodates nominal 5 V rails with ±10% tolerance for industrial power variation |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded and computing applications |
Pinout & Package
Package: 20-pin plastic small outline (SO20), SOT163-1, 7.5 mm body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (active Low) | Global 3-state enable - drives all Q outputs to high-Z when High, regardless of register state |
| 2 | Q0 | Inverted latched output - reflects complement of D0 sampled at prior CP rising edge |
| 3 | D0 | Data input - sampled on CP rising edge; determines Q0 after inversion |
| 4 | D1 | Data input - sampled on CP rising edge; determines Q1 after inversion |
| 5 | Q1 | Inverted latched output - complements D1 state captured at prior CP edge |
| 6 | Q2 | Inverted latched output - complements D2 state captured at prior CP edge |
| 7 | D2 | Data input - sampled on CP rising edge; determines Q2 after inversion |
| 8 | D3 | Data input - sampled on CP rising edge; determines Q3 after inversion |
| 9 | Q3 | Inverted latched output - complements D3 state captured at prior CP edge |
| 10 | Q4 | Inverted latched output - complements D4 state captured at prior CP edge |
| 11 | GND | Ground reference - common return for all signals and supply current |
| 12 | D4 | Data input - sampled on CP rising edge; determines Q4 after inversion |
| 13 | D5 | Data input - sampled on CP rising edge; determines Q5 after inversion |
| 14 | Q5 | Inverted latched output - complements D5 state captured at prior CP edge |
| 15 | Q6 | Inverted latched output - complements D6 state captured at prior CP edge |
| 16 | D6 | Data input - sampled on CP rising edge; determines Q6 after inversion |
| 17 | D7 | Data input - sampled on CP rising edge; determines Q7 after inversion |
| 18 | Q7 | Inverted latched output - complements D7 state captured at prior CP edge |
| 19 | VCC | +5 V supply - powers internal logic and output buffers; decoupling required near pin |
| 20 | CP | Clock input - rising-edge sensitive; triggers simultaneous sampling of all Dn inputs |
Key Features
| Feature | Design Value |
|---|---|
| Independent register and 3-state control | Enables dynamic bus sharing: data can be latched while outputs remain disabled, or outputs enabled without altering stored data |
| Inverting 3-state outputs | Provides direct compatibility with inverted-bus architectures (e.g., address/data strobes) and eliminates need for external inverters |
| Zero hold time requirement | Simplifies PCB routing and timing closure by removing constraint on D-input stability after clock edge |
| 150-unit-load fan-out (Low) | Supports connection to up to 150 standard TTL inputs without buffering, reducing component count in dense logic designs |
| Fast 3-state disable (tPLZ/tPHZ ≤ 7.5 ns) | Minimizes bus turnaround latency in bidirectional data transfer protocols such as IEEE 1149.1 JTAG or local bus arbitration |
Applications
| Microprocessor Address Latching | Industrial Bus Interface |
|---|---|
Use Scenario: Capturing and holding 8-bit address segments from multiplexed CPU buses (e.g., Z80, 8085) before decoding. IC Role / Device Role / Timing Role: Edge-triggered latch synchronizing address transitions with CPU clock; 3-state outputs isolate latched data from bus during refresh cycles. Use Value: Eliminates address glitches during bus contention and enables clean separation of address and data phases using single-cycle OE control. |
Use Scenario: Interfacing programmable logic controllers (PLCs) with sensor arrays or actuator drivers via shared parallel I/O backplanes. IC Role / Device Role / Timing Role: Bidirectional bus buffer providing controlled data direction and timing alignment between controller and field devices. Use Value: 24 mA output drive sustains signal integrity across long traces; fast 3-state switching prevents bus lock-up during mode changes. |
| Memory Data Register | Digital Test Equipment |
Use Scenario: Holding write data for static RAM or EPROM during programming cycles where address and data must be stable. IC Role / Device Role / Timing Role: Synchronous data register isolating host processor from memory timing constraints; OE allows safe read-back without disturbing write state. Use Value: Inverting outputs match common memory data bus polarity conventions, reducing external logic and board space. |
Use Scenario: Generating precise stimulus patterns and capturing response waveforms in automated test systems with parallel digital I/O cards. IC Role / Device Role / Timing Role: High-speed pattern register feeding test vectors to DUT; 165 MHz fMAX supports multi-MHz test clock rates. Use Value: Sub-10 ns propagation delay and zero hold time ensure tight timing margins for high-speed functional testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D flip-flop with 3-state outputs applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F534N | Dual-in-line package (DIP20, SOT146-1); identical AC/DC specs and pinout | Through-hole mounting only; no surface-mount option | Select for prototyping, manual assembly, or legacy DIP-based systems requiring same logic behavior |
| 74ACT534PC | Advanced CMOS (ACT) family; 5 V supply, 3-state, but non-inverting outputs and 125 MHz fMAX | Requires level-shifting or logic inversion if replacing inverting functionality; lower power (ICC ≈ 4 mA) | Select when lower static power and CMOS input compatibility are prioritized over strict 74F timing and output polarity |
Compared with SN74F534N and 74ACT534PC, the N74F534D,623 uniquely combines SO20 surface-mount packaging, inverting 3-state outputs, and 165 MHz performance-making it optimal for space-constrained, high-speed TTL-compatible bus interfaces where output polarity and package form factor are critical.
Availability
N74F534D,623 is available at Aetrix Electronics and suitable for microprocessor address latching, industrial bus interface, and memory data register applications requiring stable component supply, long-term obsolescence management, and verified legacy logic compatibility.
Supply support for N74F534D,623 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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator founded in the Netherlands, specializing in logic, analog, and mixed-signal ICs for industrial, computing, and communications markets.
The 74F logic family-including the N74F534D,623-was engineered for high-speed, low-power TTL-compatible operation in commercial-grade embedded systems, targeting applications demanding predictable timing, robust noise immunity, and backward compatibility with legacy 74-series designs.
FAQ
What is the logic polarity of the N74F534D,623 outputs?
The N74F534D,623 provides inverting 3-state outputs: each Qn terminal delivers the logical complement of its corresponding Dn input sampled at the preceding clock rising edge. This polarity is fixed and inherent to the device architecture-no configuration or external circuitry alters it. The inverting behavior is documented in the logic diagram, function table, and truth table of the Philips datasheet, and applies identically across all eight channels of the N74F534D,623.
Does the N74F534D,623 require external pull-up resistors on its 3-state outputs?
No, the N74F534D,623 does not require external pull-up resistors on its Q0–Q7 outputs. Its 3-state outputs are actively driven High or Low when enabled (OE = Low), and present true high-impedance (Z) when disabled (OE = High). Pull-ups would interfere with valid Low-state drive capability (24 mA sink) and violate the specified DC output characteristics. External termination is only needed if interfacing with open-drain or specific bus standards-not for standard TTL bus operation with the N74F534D,623.
Can the N74F534D,623 operate reliably at 5.5 V supply voltage?
Yes, the N74F534D,623 is rated for VCC = 4.5 V to 5.5 V per its Recommended Operating Conditions, and absolute maximum rating of +7.0 V confirms safe operation at 5.5 V. Electrical characteristics-including VOH ≥ 2.7 V, VOL ≤ 0.5 V, and fMAX ≥ 135 MHz-are guaranteed across this full range. However, ICC increases with VCC (86 mA max at VCC = 5.5 V), so thermal design must account for higher power dissipation when operating at the upper limit of the N74F534D,623's supply range.
What is the minimum clock pulse width required for reliable operation of the N74F534D,623?
The N74F534D,623 requires a minimum clock pulse width (tw(H) and tw(L)) of 3.5 ns at VCC = 5.0 V and Tamb = +25°C, and 4.0 ns across the full 0°C to +70°C temperature range. This specification ensures the internal flip-flop circuitry achieves proper metastability resolution and state capture. Violating this minimum width risks setup/hold violation, incomplete triggering, or erratic output behavior-particularly under worst-case process/voltage/temperature corners. The N74F534D,623's clock input is strictly edge-sensitive; pulse width compliance is mandatory for deterministic operation.
Is the N74F534D,623 pin-compatible with the SN74F574N?
No, the N74F534D,623 is not pin-compatible with the SN74F574N. Although both are octal D flip-flops with 3-state outputs, their pinouts differ significantly: the SN74F574N places CP on pin 11 and OE on pin 1, whereas the N74F534D,623 places CP on pin 20 and OE on pin 1. Additionally, output and input ordering differs across pins 2–19. Substituting one for the other without PCB redesign will result in incorrect signal routing, functional failure, and potential bus contention. Always verify pin mapping against the respective datasheets before interchange.
N74F534D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 165 MHz
- Max Propagation Delay @ V, Max CL:
- 7ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 3mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 86 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
N74F534D,623 FAQ
1.How can I place an order for N74F534D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F534D,623 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 N74F534D,623 reliable?
The price and inventory of N74F534D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F534D,623 is usually 5 days.
3.What payment methods are accepted for N74F534D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F534D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F534D,623?
N74F534D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F534D,623 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 N74F534D,623?
For technical support, including N74F534D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F534D,623 requirements.
6.How does Aetrix verify that N74F534D,623 is sourced from the original manufacturer or authorized distributors?
All N74F534D,623 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 N74F534D,623 meets industry standards.
7.What is the process for return or replacement of N74F534D,623?
All N74F534D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F534D,623, 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 N74F534D,623 part is unused and in its original packaging.
Return procedure for N74F534D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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