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NXP Semiconductors 74HC7403D,518
- Part No.:
- 74HC7403D,518
- Manufacturer:
- NXP Semiconductors
- Category:
- FIFOs Memory
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC7403D,518.pdf
- Description:
- IC FIFO ASYNC/SYNC 64X4 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
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Product details
Overview
74HC7403D,518 from NXP Semiconductors is a 4-bit × 64-word asynchronous/synchronous FIFO register with 3-state outputs, CMOS-level inputs, and guaranteed 15 MHz data rate under flag-controlled operation. It features independent shift-in (SI) and shift-out (SO) controls, DIR/DOR status flags, master reset (MR), and output enable (OE). It is used in high-speed disc/tape controllers and communications buffers requiring deterministic data staging.
For engineers reviewing the 74HC7403D,518 datasheet, 74HC7403D,518 pinout, 74HC7403D,518 application, or 74HC7403D,518 equivalent, this page delivers verified functional architecture, SO16 package mapping, timing-critical propagation delays (e.g., SI→DIR ≤41 ns @ VCC=4.5 V), flag behavior under burst/ripple-through modes, and validated alternatives for FIFO expansion or voltage-level compatibility.
Technical Context
The 74HC7403D,518 implements a dual-stage FIFO architecture with separate input and output registers, enabling true asynchronous read/write via SI and SO signals. DIR asserts HIGH when the input stage is empty and ready; DOR asserts HIGH when valid data resides in the output stage.
It supports synchronous burst-mode operation (up to 30 MHz typical shift-in/out) when status flags are ignored, and asynchronous ripple-through/bubble-up transfers when flags coordinate handshaking. Pin layout enables easy PCB routing with input pins (D0–D3, SI, MR, OE) opposite output pins (Q0–Q3, SO, DIR, DOR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory depth | 64 words × 4 bits - provides fixed-depth buffering for protocol framing or data rate matching without external RAM. |
| Max clock/data rate | 30 MHz typical (burst mode); 15 MHz guaranteed (flag-controlled) - defines maximum sustained throughput in handshaked systems. |
| Propagation delay (SI→DIR) | ≤41 ns max @ VCC=4.5 V, −40 °C to +125 °C - sets minimum SI pulse spacing for reliable flag assertion in cascaded FIFOs. |
| Supply voltage range | 2.0 V to 6.0 V - supports mixed-voltage system integration and battery-backed operation down to 2 V. |
| Operating temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments. |
| Output drive | 3-state, ±8 mA @ VCC=4.5 V - enables bus sharing and direct connection to 5 V TTL or CMOS loads. |
| Input logic level | CMOS-compatible (VIH ≥3.15 V @ VCC=4.5 V) - ensures noise margin and compatibility with HC/HCT logic families. |
Pinout & Package
74HC7403D,518 is housed in a plastic small outline package (SO16), 16-lead, 3.9 mm body width (SOT109-1), rated for −40 °C to +125 °C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-LOW control of Q0–Q3 3-state drivers; enables shared-bus operation without external gating. |
| 2 (DIR) | Data-in-ready output | HIGH = input stage empty and ready to accept new word; LOW = full/busy - used for flow control handshake. |
| 3 (SI) | Shift-in input | Active-HIGH edge-triggered load signal; initiates parallel data transfer from D0–D3 into input stage. |
| 4–7 (D0–D3) | Parallel data inputs | 4-bit wide parallel data path synchronized to SI; latched on SI rising edge. |
| 8 (GND) | Ground reference | 0 V return for all internal logic and I/O; must be low-impedance for stable timing and noise immunity. |
| 9 (MR) | Master-reset input | Asynchronous active-LOW reset clearing both input and output stages; overrides all other controls. |
| 10–13 (Q0–Q3) | Data outputs | 4-bit parallel output stage driven only when OE is LOW; tri-stated otherwise. |
| 14 (DOR) | Data-out-ready output | HIGH = valid data present at Q0–Q3; LOW = output stage empty/busy - used for consumer-side handshaking. |
| 15 (SO) | Shift-out input | Active-LOW edge-triggered unload signal; initiates parallel data transfer from output stage to Q0–Q3. |
| 16 (VCC) | Supply voltage | Primary power rail (2.0–6.0 V); powers all logic, I/O, and internal registers; requires local decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous or asynchronous operation | Independent SI/SO controls allow fully asynchronous data staging or synchronous burst transfers without flag monitoring. |
| 30 MHz typical shift-in/out rate | Enables high-throughput buffering in serial link interfaces (e.g., UART-to-parallel bridges) without external clock domain crossing logic. |
| Expandable in word and bit dimensions | Parallel expansion via ANDed DIR/DOR flags; serial cascade using DOR→SI and SO→DIR connections - supports >64-word or >4-bit FIFOs. |
| Pinning for easy board layout | Input pins (3–7, 9, 15) directly opposite outputs (10–13, 2, 14) - minimizes trace crossovers and reduces signal integrity risk. |
| 3-state outputs with OE | Allows direct connection to shared data buses (e.g., microcontroller address/data multiplexed buses) without external bus transceivers. |
| JEDEC JESD7A compliance & ESD protection | HBM >2000 V and MM >200 V ensure robustness during handling and operation in industrial assembly and field environments. |
Applications
| High-Speed Disc/Tape Controller | Communications Buffer |
|---|---|
Use Scenario: Buffering sector data between rotating media interface and host controller during variable-latency seek operations. IC Role / Device Role / Timing Role: 4-bit × 64-word FIFO absorbs write bursts and smooths read latency spikes using DIR/DOR handshaking. Use Value: Eliminates host wait states by decoupling mechanical media timing from digital bus timing; supports 15 MHz sustained throughput. |
Use Scenario: Isolating UART or SPI peripherals from processor core during packetized data transmission. IC Role / Device Role / Timing Role: Asynchronous FIFO stage holding incoming frames until CPU is ready; SI/SO enable independent clock domains. Use Value: Prevents data loss during interrupt latency; 30 MHz burst mode handles short high-rate bursts without software overhead. |
| FIFO Expansion Node | Industrial Protocol Bridge |
Use Scenario: Building an 8-bit × 64-word FIFO using two 74HC7403D,518 devices in parallel configuration. IC Role / Device Role / Timing Role: One device handles D0–D3/Q0–Q3; second handles D4–D7/Q4–Q7; DIR/DOR flags ANDed to form composite status. Use Value: Maintains identical timing behavior as single device (except added gate delay), enabling scalable word-width without redesign. |
Use Scenario: Bridging legacy 4-bit parallel sensor interface to modern 32-bit microcontroller with DMA-capable peripherals. IC Role / Device Role / Timing Role: Staging sensor samples in 64-deep buffer; MR enables hardware-initiated flush on error; OE supports dynamic bus arbitration. Use Value: Reduces firmware polling overhead; −40 °C to +125 °C rating ensures reliability in motor control enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT7403D,518 | TTL-compatible inputs (VIH = 2.0 V min @ VCC = 4.5 V); identical pinout, timing, and functionality. | Required when interfacing with legacy 5 V TTL logic families; not suitable for pure CMOS systems below 3.3 V. | Select 74HCT7403D,518 only if driving circuitry uses TTL voltage thresholds; otherwise 74HC7403D,518 offers better noise margin in mixed-signal designs. |
| SN74ACT2227N | 8-bit × 64-word FIFO, 5 V supply only, faster tpd (≤25 ns), but no DIR/DOR flags - uses EF/FF status pins instead. | Higher data width and speed, but lacks native handshaking flags; requires external logic for DIR/DOR-equivalent behavior. | Choose SN74ACT2227N only when 8-bit width and sub-25 ns timing are mandatory and flag logic can be implemented externally. |
Compared with 74HCT7403D,518 and SN74ACT2227N, the 74HC7403D,518 uniquely combines CMOS input thresholds, integrated DIR/DOR handshaking, SO16 packaging, and −40 °C to +125 °C operation - making it optimal for space-constrained, thermally demanding, and noise-sensitive embedded FIFO applications.
Availability
74HC7403D,518 is available at Aetrix Electronics and suitable for high-speed disc/tape controllers, communications buffers, industrial protocol bridges, and FIFO expansion nodes requiring stable component supply across extended temperature ranges.
Supply support for 74HC7403D,518 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 markets.
The 74HC7403D,518 belongs to NXP's legacy 74HC logic family, designed specifically for high-reliability, low-power, and thermally robust data buffering in embedded control and interface applications.
FAQ
What is the maximum guaranteed data rate for 74HC7403D,518 under flag-controlled operation?
The 74HC7403D,518 guarantees a 15 MHz data rate when DIR and DOR flags are used for handshaking - ensuring deterministic timing for synchronous read/write coordination. This specification is validated across the full −40 °C to +125 °C operating range and applies to both SI and SO operations with proper flag monitoring.
Does 74HC7403D,518 support true asynchronous read and write operations?
Yes, the 74HC7403D,518 supports true asynchronous operation via independent SI and SO controls. Data can be shifted in while simultaneously shifting out - provided the input and output stages are not both full or both empty. The DIR and DOR flags provide real-time status to prevent over/underflow without requiring shared clocks.
How does the master reset (MR) function affect the 74HC7403D,518 internal state?
The MR input is an asynchronous active-LOW signal that clears both the input and output stages of the 74HC7403D,518. When asserted, MR forces DIR HIGH (input ready), DOR LOW (output empty), and Q0–Q3 LOW. It overrides all other controls including SI, SO, and OE, and takes effect immediately regardless of clock or flag state.
Can multiple 74HC7403D,518 devices be cascaded to increase FIFO depth beyond 64 words?
Yes, serial cascading is supported: connect DOR of the first device to SI of the second, and SO of the first to DIR of the second. This configuration creates a 128-word × 4-bit FIFO with ripple-through timing. The 74HC7403D,518 datasheet confirms this topology and specifies timing margins for reliable multi-stage operation.
What is the purpose of the 3-state outputs and OE pin on 74HC7403D,518?
The OE (output enable) pin controls the 3-state drivers on Q0–Q3. When OE is HIGH, outputs are high-impedance - allowing multiple 74HC7403D,518 devices or other peripherals to share the same data bus without contention. When OE is LOW, Q0–Q3 drive valid logic levels. This eliminates need for external bus transceivers in multi-FIFO systems.
74HC7403D,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 256 (64 x 4)
- Function:
- Asynchronous, Synchronous
- Data Rate:
- 30MHz
- Access Time:
- 49ns
- Voltage - Supply:
- 2 V ~ 6 V
- Current - Supply (Max):
- 1mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- No
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HC7403D,518 FAQ
1.How can I place an order for 74HC7403D,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC7403D,518 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 74HC7403D,518 reliable?
The price and inventory of 74HC7403D,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7403D,518 is usually 5 days.
3.What payment methods are accepted for 74HC7403D,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7403D,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC7403D,518?
74HC7403D,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC7403D,518 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 74HC7403D,518?
For technical support, including 74HC7403D,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7403D,518 requirements.
6.How does Aetrix verify that 74HC7403D,518 is sourced from the original manufacturer or authorized distributors?
All 74HC7403D,518 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 74HC7403D,518 meets industry standards.
7.What is the process for return or replacement of 74HC7403D,518?
All 74HC7403D,518 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7403D,518, 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 74HC7403D,518 part is unused and in its original packaging.
Return procedure for 74HC7403D,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC7403D,518 Tags
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7201LA15JGI
Renesas
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7204L12JG
Renesas
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72V82L15PAG8
Renesas
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7205L15JGI
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7208L20JG
Renesas
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72V2105L10PFG
Renesas
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72V2111L15PFGI
Renesas
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72V2113L6PFG
Renesas
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72V36110L6PFG
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SN74ALVC7804-40DL
Texas Instruments
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7202LA25JGI
Renesas
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SN74V245-15PAG
Texas Instruments
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