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NXP Semiconductors N74F273AD,623
- Part No.:
- N74F273AD,623
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F273AD,623.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,503
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Product details
Overview
N74F273AD,623 from Philips Semiconductors is an octal D-type flip-flop IC with edge-triggered operation, 170 MHz maximum clock frequency, 25 mA typical supply current, and 20-pin SOIC (SOT163-1) package. It features buffered common clock (CP) and asynchronous master reset (MR), eight independent D inputs and Q outputs, and is used in synchronous register applications requiring true-level output storage in microprocessor data paths.
For engineers reviewing the N74F273AD,623 datasheet, N74F273AD,623 pinout, N74F273AD,623 application, or N74F273AD,623 equivalent, key selection criteria include setup/hold timing (ts = 2.5 ns, th = 1.0 ns), propagation delay (tPLH/tPHL ≤ 10.0 ns), MR-to-CP recovery time (tREC = 5.0 ns), and compatibility with 5 V ±10% TTL systems operating from 0°C to +70°C.
Technical Context
The N74F273AD,623 implements eight fully edge-triggered D flip-flops sharing a single rising-edge–sensitive clock (CP) and active-low asynchronous master reset (MR). All Q outputs are forced low independently of CP or D inputs when MR is asserted.
It operates strictly under TTL-compatible voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max), delivers 20 mA sink current per output (IOL), and maintains high-impedance inputs (±20 µA) to minimize loading on upstream drivers - making it suitable for buffering MOS microprocessor address/data buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 170 MHz typical - supports high-speed synchronous register transfer in 5 V TTL systems. |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V ±10% logic rails and tolerant of transient droop. |
| tPLH / tPHL | ≤10.0 ns max - ensures predictable timing margins in 125 MHz system clocks with 50 pF load. |
| ts / th | 2.5 ns setup / 1.0 ns hold - defines minimum D-stability window before/after CP rising edge. |
| IOL / IOH | 20 mA / –1 mA - drives standard TTL loads directly without external buffers. |
| ICC (total) | 24–43 mA - enables accurate power budgeting for multi-register control logic blocks. |
| tREC (MR→CP) | 5.0 ns min - mandates minimum delay between MR deassertion and next valid clock edge. |
Pinout & Package
Package: 20-lead plastic small outline (SO20), body width 7.5 mm, SOT163-1 footprint - surface-mount compatible with standard reflow profiles and IPC-7351B SOIC-20 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Active-low asynchronous master reset - forces all Qn to Low regardless of CP or Dn state. |
| 2–9 | Q0–Q7 | True-level registered outputs - no inversion; each reflects corresponding Dn sampled at CP↑. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling. |
| 11–18 | D0–D7 | Data inputs - sampled one setup time before CP rising edge; high-impedance (±20 µA). |
| 19 | CP | Buffered clock input - edge-triggered on Low-to-High transition; drives internal register array synchronously. |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered register architecture | Ensures deterministic sampling of D inputs only at CP rising edge - eliminates metastability risk from asynchronous data changes. |
| Buffered CP and MR inputs | Reduces fan-out loading on clock/reset distribution networks - supports direct drive from single TTL gate output. |
| High-impedance inputs (±20 µA) | Minimizes DC loading on preceding logic stages - critical for cascaded bus interfaces and memory address latching. |
| True-output-only design | Eliminates need for complementary outputs - simplifies PCB routing and reduces component count in unidirectional data paths. |
| Commercial temperature range (0°C to +70°C) | Validated for industrial control panels, test equipment, and embedded computing environments without extended thermal management. |
Applications
| Microprocessor Data Latching | Address Register Buffering |
|---|---|
|
Use Scenario: Capturing 8-bit parallel data from a microprocessor data bus during write cycles. IC Role / Device Role / Timing Role: Edge-triggered register holding data stable for peripheral interface timing windows. Use Value: Eliminates need for external gating logic by providing synchronized, glitch-free output capture aligned to CPU clock edges. |
Use Scenario: Holding 8-bit segment or offset address bits for memory-mapped I/O decoding. IC Role / Device Role / Timing Role: Address latch ensuring stable address presentation during full memory access cycle. Use Value: Prevents address skew between adjacent bits - critical for reliable decoding of 8-bit peripheral address spaces. |
| State Machine Control Register | Test Pattern Generator Storage |
|
Use Scenario: Storing current state bits in a finite-state machine implemented with discrete logic. IC Role / Device Role / Timing Role: Synchronous state register updated only on clock edge with global reset capability. Use Value: Enables deterministic state transitions and safe power-up initialization via MR pin. |
Use Scenario: Holding fixed 8-bit test vectors applied to digital circuit under test (DUT). IC Role / Device Role / Timing Role: Static pattern register driven by bench controller or pattern generator. Use Value: Provides repeatable, jitter-free stimulus with precise timing alignment to DUT clock domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F273N | 20-pin PDIP package (SOT146-1); identical AC/DC specs and pinout. | Through-hole assembly; requires wave solder or hand-solder process instead of reflow. | Select when legacy board assembly, prototyping, or socket-based testing is required. |
| 74F377A | Includes clock enable (CE) input; otherwise identical register function and timing. | Enables gated clocking - useful where selective register update is needed without MR assertion. | Select when dynamic clock gating is required; note CE adds one input pin and modifies logic flow. |
Compared with SN74F273N and 74F377A, the N74F273AD,623 provides identical core functionality in a surface-mount SOIC package optimized for automated production, while 74F377A adds clock enable flexibility at the cost of increased control complexity.
Availability
N74F273AD,623 is available at Aetrix Electronics and suitable for microprocessor data latching, address register buffering, and state machine control applications requiring stable component supply across industrial and embedded product lifecycles.
Supply support for N74F273AD,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 foundational European semiconductor manufacturer known for pioneering TTL, CMOS, and logic families with rigorous industrial qualification.
The 74F273A family was designed for high-speed, low-power synchronous register functions in 5 V digital systems - targeting microprocessor support logic, memory interfacing, and programmable logic control.
FAQ
What is the maximum clock frequency supported by N74F273AD,623?
The N74F273AD,623 supports a maximum clock frequency of 170 MHz under typical conditions (VCC = 5.0 V, Tamb = 25°C, CL = 50 pF). At full commercial temperature range (0°C to +70°C) and VCC = 5.0 V ±10%, the guaranteed minimum fMAX is 125 MHz - sufficient for most 8-bit microcontroller and peripheral interface timing requirements.
Does N74F273AD,623 have 3-state outputs?
No, the N74F273AD,623 does not feature 3-state outputs. It provides true-level (non-inverting) push-pull outputs only. For 3-state functionality, Philips specifies the 74F374 as the functional counterpart - which shares the same pinout but adds output-enable control and tri-state capability.
What is the purpose of the Master Reset (MR) pin on N74F273AD,623?
The MR pin on N74F273AD,623 is an active-low asynchronous reset that forces all eight Q outputs to Low immediately, independent of the clock (CP) or data (Dn) inputs. This allows deterministic initialization of the register at power-up or system fault recovery without waiting for a clock edge.
Can N74F273AD,623 operate with a 3.3 V supply?
No, the N74F273AD,623 is specified only for 4.5–5.5 V operation. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive strength are optimized for 5 V TTL systems. Using 3.3 V violates recommended operating conditions and may result in unreliable switching or excessive ICC.
Is N74F273AD,623 pin-compatible with other 74F-series octal flip-flops?
Yes, the N74F273AD,623 shares identical pinout with SN74F273N (PDIP) and matches the 20-pin SOIC layout of 74F377A and 74F374 - enabling direct PCB footprint reuse across these variants when package type permits. However, functional differences (e.g., CE input on 74F377A) require logic-level verification.
N74F273AD,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:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 170 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 1mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 38 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
N74F273AD,623 FAQ
1.How can I place an order for N74F273AD,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F273AD,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 N74F273AD,623 reliable?
The price and inventory of N74F273AD,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F273AD,623 is usually 5 days.
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Once your N74F273AD,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 N74F273AD,623?
For technical support, including N74F273AD,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F273AD,623 requirements.
6.How does Aetrix verify that N74F273AD,623 is sourced from the original manufacturer or authorized distributors?
All N74F273AD,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 N74F273AD,623 meets industry standards.
7.What is the process for return or replacement of N74F273AD,623?
All N74F273AD,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F273AD,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 N74F273AD,623 part is unused and in its original packaging.
Return procedure for N74F273AD,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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