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NXP Semiconductors 74HCT7403D,512
- Part No.:
- 74HCT7403D,512
- Manufacturer:
- NXP Semiconductors
- Category:
- FIFOs Memory
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT7403D,512.pdf
- Description:
- IC FIFO ASYNC/SYNC 64X4 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,720
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Product details
Overview
74HCT7403D,512 from NXP Semiconductors is a 4-bit × 64-word asynchronous/synchronous FIFO register with TTL-compatible inputs, 3-state outputs, and dual independent shift-in (SI) / shift-out (SO) controls. It delivers guaranteed 15 MHz data rate (up to 30 MHz typical in burst mode), operates from −40 °C to +125 °C, and features DIR/DOR status flags for handshaking-used in high-speed disc/tape controllers and communications buffers.
For engineers reviewing the 74HCT7403D,512 datasheet, 74HCT7403D,512 pinout, 74HCT7403D,512 application, or 74HCT7403D,512 equivalent, this device supports cascaded expansion (serial/parallel), offers 16-pin SO package with input clamping diodes, and provides precise timing control via SI/SO pulse widths, recovery times, and flag propagation delays critical for deterministic data buffering.
Technical Context
This FIFO implements a two-stage pipeline architecture: an input stage accepting parallel 4-bit data (D0–D3) on SI assertion, and an output stage delivering data (Q0–Q3) on SO assertion. DIR and DOR flags reflect real-time readiness of input and output stages respectively, enabling synchronous or asynchronous operation without external arbitration logic.
It uses standard CMOS process with TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), supports 3-state output control via OE (active LOW), and includes asynchronous master reset (MR) that clears FIFO contents and resets flags-ensuring deterministic startup and error recovery in embedded control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory depth | 64 words × 4 bits - provides fixed-depth buffering for bursty data streams without dynamic memory management. |
| Max clock/data rate | 30 MHz typical (burst mode, no flag monitoring); 15 MHz guaranteed with DIR/DOR handshaking - enables high-throughput serial interfaces. |
| Supply voltage range | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems and industrial 5 V rails. |
| Operating temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial motor control environments. |
| Propagation delay (DOR to Qn) | 7 ns typical (VCC = 4.5 V) - ensures low-latency output availability after flag assertion, critical for real-time response. |
| Input transition rate | 1.67 ns/V (VCC = 4.5 V) - defines minimum allowable edge slew rate to prevent metastability in asynchronous transfers. |
| Power dissipation capacitance | 490 pF - used to calculate dynamic power (PD = CPD × VCC² × fi × N), essential for thermal design in dense PCB layouts. |
Pinout & Package
74HCT7403D,512 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width, optimized for surface-mount assembly and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-LOW control for 3-state Q0–Q3 outputs; allows bus sharing without external tri-state logic. |
| 2 (DIR) | Data-in-ready flag | HIGH = input stage empty and ready to accept new word; LOW = full/busy - enables flow-controlled write operations. |
| 3 (SI) | Shift-in control | Active-HIGH signal triggering parallel load into input stage; initiates ripple-through to output stage when LOW. |
| 4–7 (D0–D3) | Parallel data inputs | 4-bit wide data bus accepting word-aligned input; clamped diodes permit safe interfacing to voltages > VCC. |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; requires low-impedance PCB plane for noise immunity. |
| 9 (MR) | Master reset input | Asynchronous active-LOW signal clearing FIFO contents and resetting DIR/DOR flags to known state. |
| 10–13 (Q0–Q3) | Data outputs | 4-bit parallel output bus with 3-state capability; driven only when OE = LOW and DOR = HIGH. |
| 14 (DOR) | Data-out-ready flag | HIGH = valid data present at Q0–Q3; LOW = output stage empty/busy - enables handshake-driven read cycles. |
| 15 (SO) | Shift-out control | Active-LOW signal unloading data from output stage; triggers "bubble-up" of next word when asserted. |
| 16 (VCC) | Supply voltage | +4.5 V to +5.5 V power rail; decoupling capacitor (100 nF ceramic) required within 5 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous or asynchronous operation | Independent SI/SO controls allow fully asynchronous data transfer or synchronized operation using DIR/DOR flags - eliminates need for external clock domain crossing logic. |
| 30 MHz typical shift-in/out rate | Enables >120 MB/s effective throughput (30 MHz × 4 bits) in burst mode - suitable for high-speed serial link bridging. |
| Readily expandable in word and bit dimensions | Parallel expansion via ANDed DIR/DOR signals; serial cascade by connecting Qn→Dn and DOR→SI - scales capacity without redesigning controller firmware. |
| Pinning arranged for easy board layout | Input pins (D0–D3, SI, MR, OE) on left side; outputs (Q0–Q3, SO, DOR) on right - minimizes trace crosstalk and simplifies routing in 4-layer PCBs. |
| TTL-level input compatibility | VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V - ensures direct interfacing with legacy 5 V microcontrollers and FPGAs without level shifters. |
Applications
| High-Speed Disc/Tape Controller | Communications Buffer |
|---|---|
|
Use Scenario: Buffering sector data between rotating media interface and host processor during variable-speed read/write operations. IC Role / Device Role / Timing Role: FIFO acts as elastic buffer absorbing jitter between mechanical latency and fixed-rate host bus transfers. Use Value: 64-word depth accommodates worst-case rotational latency; DIR/DOR flags prevent overrun/underrun without CPU polling overhead. |
Use Scenario: Isolating UART, SPI, or CAN transceivers from host MCU during packetized data transmission. IC Role / Device Role / Timing Role: Decouples transmitter/receiver timing domains while maintaining data integrity across clock boundaries. Use Value: 30 MHz burst rate handles 120 Mbps serial streams; 3-state outputs enable shared bus access in multi-peripheral systems. |
| Industrial PLC I/O Module | Test Equipment Data Acquisition |
|
Use Scenario: Aggregating sensor readings from multiple analog/digital I/O channels before batch upload to central controller. IC Role / Device Role / Timing Role: Synchronizes asynchronous sensor events into time-ordered stream using SI-triggered capture and SO-driven readout. Use Value: −40 °C to +125 °C rating ensures reliability in cabinet-mounted automation hardware; MR pin enables clean reset on power-up or fault recovery. |
Use Scenario: Capturing high-frequency waveform samples from ADC front-end before processing or storage. IC Role / Device Role / Timing Role: Provides deterministic latency window for sample buffering, allowing host to service FIFO at its own pace. Use Value: Low 7 ns DOR→Qn propagation delay enables tight timing closure in 100+ MSPS acquisition systems; SO pulse width spec ensures reliable trigger alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC7403D,512 | CMOS-level inputs (VIH = 3.15 V min), wider VCC range (2.0–6.0 V), lower ICC (50 µA typ) | Better suited for mixed-voltage systems (e.g., 3.3 V logic with 5 V peripherals) and ultra-low-power standby modes | Select when interfacing with HC-family logic or requiring extended supply flexibility beyond 5 V. |
| SN74ACT2227N | 5 V only, higher drive strength (±24 mA), faster tpd (5 ns DOR→Qn), but no DIR/DOR flags | Requires external handshaking logic; better for fixed-rate streaming where flag overhead is unnecessary | Choose when maximum speed and drive capability outweigh handshaking convenience and temperature range. |
Compared with 74HCT7403D,512, the 74HC7403D,512 offers broader supply tolerance and lower static current but lacks TTL input compatibility, while the SN74ACT2227N delivers superior speed and drive at the cost of integrated status signaling and extended temperature support.
Availability
74HCT7403D,512 is available at Aetrix Electronics and suitable for high-speed disc/tape controllers, communications buffers, industrial PLC I/O modules, and test equipment data acquisition systems requiring stable component supply across automotive and industrial temperature ranges.
Supply support for 74HCT7403D,512 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in logic, interface, and timing devices.
The 74HCT7403D,512 belongs to NXP's legacy 74HCT logic family, designed specifically for robust 5 V system interfacing with TTL-compatible inputs and industrial-grade reliability across extended temperature ranges.
FAQ
What is the guaranteed maximum operating frequency of the 74HCT7403D,512 when using DIR/DOR handshaking?
The 74HCT7403D,512 guarantees 15 MHz data rate under full handshaking (DIR/DOR monitored). At VCC = 4.5 V and −40 °C to +125 °C, the maximum frequency drops to 12 MHz per datasheet Table 6. This ensures deterministic timing margins for safety-critical buffering where flag-based flow control is mandatory. The 74HCT7403D,512 maintains this specification across its full industrial temperature range.
How does the master reset (MR) pin affect FIFO contents and status flags in the 74HCT7403D,512?
The MR pin is asynchronous and active LOW: asserting MR clears all 64 words of stored data, forces DIR HIGH (indicating input stage ready), sets DOR LOW (indicating output stage empty), and drives Q0–Q3 LOW. After MR release, the 74HCT7403D,512 enters a known idle state-critical for predictable initialization in power-on-reset sequences and fault recovery routines.
Can the 74HCT7403D,512 be used in a 3.3 V system?
No-the 74HCT7403D,512 is specified only for VCC = 4.5 V to 5.5 V. Its TTL-compatible inputs require VIH ≥ 2.0 V, but operation below 4.5 V violates recommended conditions and risks undefined behavior. For 3.3 V systems, use the 74LVC7403 or similar LVCMOS FIFO; the 74HCT7403D,512 must be powered from a regulated 5 V rail.
What is the purpose of the input clamping diodes in the 74HCT7403D,512?
The built-in clamp diodes on all inputs (D0–D3, SI, SO, MR, OE) allow safe connection to signal sources exceeding VCC-such as 12 V control lines-when used with current-limiting resistors. This protects the 74HCT7403D,512 from overvoltage damage without external components, simplifying interface design in mixed-voltage industrial control panels.
How does serial cascading work between two 74HCT7403D,512 devices?
Serial cascading connects Q0–Q3 of FIFO-A to D0–D3 of FIFO-B, ties DOR-A to SI-B, and links SO-A to DIR-B. When FIFO-A's output stage empties, DOR-A goes HIGH, triggering SI-B to load the next word into FIFO-B's input stage. This extends capacity to 128 × 4 bits while preserving flag-based handshaking-enabling seamless expansion without controller modification. The 74HCT7403D,512 supports this topology per Figure 21 in the datasheet.
74HCT7403D,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 256 (64 x 4)
- Function:
- Asynchronous, Synchronous
- Data Rate:
- 30MHz
- Access Time:
- 61ns
- Voltage - Supply:
- 4.5 V ~ 5.5 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
74HCT7403D,512 FAQ
1.How can I place an order for 74HCT7403D,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT7403D,512 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 74HCT7403D,512 reliable?
The price and inventory of 74HCT7403D,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT7403D,512 is usually 5 days.
3.What payment methods are accepted for 74HCT7403D,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT7403D,512 transactions.
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4.How is shipping managed for 74HCT7403D,512?
74HCT7403D,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT7403D,512 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 74HCT7403D,512?
For technical support, including 74HCT7403D,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT7403D,512 requirements.
6.How does Aetrix verify that 74HCT7403D,512 is sourced from the original manufacturer or authorized distributors?
All 74HCT7403D,512 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 74HCT7403D,512 meets industry standards.
7.What is the process for return or replacement of 74HCT7403D,512?
All 74HCT7403D,512 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT7403D,512, 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 74HCT7403D,512 part is unused and in its original packaging.
Return procedure for 74HCT7403D,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT7403D,512 Tags
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