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Texas Instruments SN74ALVC7803-40DL
- Part No.:
- SN74ALVC7803-40DL
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC7803-40DL.pdf
- Description:
- IC FIFO SYNC 512X18 20NS 56SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALVC7803-40DL from Texas Instruments is a 512 × 18 clocked first-in, first-out (FIFO) memory IC designed for asynchronous data buffering between independent clock domains. It operates at 3.0–3.6 V, supports up to 40 MHz read/write clocks, delivers 13 ns access time with 50-pF load, and features synchronized input-ready (IR) and output-ready (OR) flags. It is used in high-speed digital interface bridging, such as between DSPs and peripherals.
For engineers reviewing the SN74ALVC7803-40DL datasheet, SN74ALVC7803-40DL pinout, SN74ALVC7803-40DL application, or SN74ALVC7803-40DL equivalent, key selection considerations include its 56-pin DL package, programmable almost-full/almost-empty flag offsets, bidirectional configuration capability without external logic, and compatibility with 3.3-V systems requiring deterministic latency and full/half/empty status signaling.
Technical Context
The SN74ALVC7803-40DL implements a synchronous dual-clock FIFO architecture with independent write and read pointer control logic, status flag generation circuitry, and 512-word × 18-bit SRAM core. Its IR and OR flags are edge-synchronized to WRTCLK and RDCLK respectively, ensuring metastability-free handshaking across clock domains.
It supports programmable AF/AE flag thresholds via D0–D7 and PEN during reset initialization, with default X = Y = 64. The device requires four rising edges on both clocks during RESET assertion to initialize all flags and pointers, and mandates power-up reset for reliable operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 512 × 18 bits - provides 9.2-kbit buffer capacity for wide-data-path applications like video pixel streaming or parallel bus bridging. |
| Supply Voltage Range | 3.0 V to 3.6 V - optimized for 3.3-V system rails with ±0.3-V tolerance; not compatible with 5-V or 2.5-V logic families. |
| Max Clock Frequency | 40 MHz - verified maximum operational frequency for both read and write clocks under recommended conditions (CL = 50 pF). |
| Access Time | 13 ns - worst-case propagation delay from RDCLK↑ to valid Q0–Q17 output with all 18 bits switching simultaneously. |
| Flag Synchronization | IR and OR flags synchronized to WRTCLK↑ and RDCLK↑ - eliminates metastability in handshake signals across asynchronous clock domains. |
| Programmable AF/AE Offsets | X and Y programmable 0–255 (default 64) - enables custom buffer watermarking for flow control in real-time data pipelines. |
| Input/Output Drive | IOH = –8 mA / IOL = 16 mA at VCC = 3 V - sufficient drive strength for direct connection to standard 3.3-V CMOS loads without buffers. |
Pinout & Package
Packaged in a 56-pin shrink small-outline (DL) package with 25-mil center-to-center lead spacing and 300-mil body width, compliant with JEDEC MO-118. Pin count and layout match SN74ACT7803 for drop-in replacement in legacy 3.3-V upgrades.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET (1) | Asynchronous reset input | Must be held low for ≥4 WRTCLK↑ and ≥4 RDCLK↑ edges to initialize flags (IR/OR/HF low, AF/AE high) and clear memory pointers. |
| WRTCLK (25), RDCLK (32) | Free-running clock inputs | Independent, asynchronous or coincident clocks; rising-edge triggered for write/read operations; no duty-cycle restriction. |
| WRTEN1 (27), WRTEN2 (26), RDEN (31) | Enable controls | WRTEN1 high + WRTEN2 low + IR high enables write; RDEN low + OE1/OE2 low + OR high enables read. |
| D0–D17 (2–21, 12–14, 9–11) | 18-bit parallel data input | Inputs latched on WRTCLK↑ when write enable conditions met; D0–D7 also used to program AF/AE offsets when PEN is active. |
| Q0–Q17 (33–34, 36–38, 40–43, 45–49, 51, 53–55) | 18-bit parallel data output | Outputs driven on RDCLK↑ when read enabled; first word appears on Q0–Q17 after third RDCLK↑ following first write. |
| IR (28), OR (29), HF (22), AF/AE (24) | Status flag outputs | IR high = FIFO not full; OR high = valid data available; HF high = ≥256 words stored; AF/AE high = ≤64 or ≥448 words stored (default). |
| PEN (23), OE1 (56), OE2 (30) | Configuration/enable inputs | PEN low during reset enables AF/AE offset programming; OE1/OE2 control 3-state output drivers - both must be low for read output enable. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional data buffering | Two SN74ALVC7803-40DL devices can be interconnected without external logic to support full-duplex data flow between two clock domains. |
| Width expansion support | Multiple devices can be cascaded to implement 36-bit or wider FIFOs (e.g., 512 × 36) using shared clocks and enable signals. |
| Synchronized ready flags | IR and OR flags are registered to their respective clock edges, eliminating metastability and enabling safe inter-clock-domain handshaking. |
| Programmable watermarks | AF/AE flag thresholds (X/Y) are user-programmable via D0–D7 and PEN, allowing custom buffer occupancy signaling for adaptive flow control. |
| Low-power advanced CMOS | Quiescent ICC ≈ 40 µA; dynamic current scales with clock frequency and switching activity - suitable for power-constrained embedded systems. |
Applications
| High-Speed DSP Interface | Parallel Bus Bridging |
|---|---|
Use Scenario: Buffering data between a 40-MHz DSP core and a slower 20-MHz peripheral controller with mismatched clock domains. IC Role / Device Role / Timing Role: SN74ALVC7803-40DL acts as a clock-domain crossing FIFO, absorbing burst writes from the DSP and releasing data at the peripheral's pace using independent RDCLK. Use Value: Eliminates need for complex handshake logic or PLL-based clock synchronization; 13-ns access ensures minimal latency overhead in real-time signal processing loops. |
Use Scenario: Interfacing an FPGA-configured 18-bit address/data multiplexed bus to a microcontroller with separate 18-bit data bus. IC Role / Device Role / Timing Role: SN74ALVC7803-40DL serves as a decoupling FIFO, accepting burst transfers from the FPGA and presenting steady data to the MCU via its RDCLK domain. Use Value: Prevents bus contention and timing violations; half-full (HF) and AF/AE flags allow the MCU to throttle reads before overflow or underflow occurs. |
| Video Pixel Stream Buffering | Industrial PLC Data Aggregation |
Use Scenario: Temporarily storing 18-bit RGB pixel data from a camera sensor running at 33 MHz before transfer to a frame buffer operating at 25 MHz. IC Role / Device Role / Timing Role: SN74ALVC7803-40DL functions as a line-buffer FIFO, absorbing pixel bursts and smoothing delivery to downstream memory controllers. Use Value: Maintains uninterrupted pixel stream integrity; programmable AF/AE offsets let designers set early warning thresholds (e.g., X=32) to trigger DMA pre-fetch before buffer starvation. |
Use Scenario: Consolidating sensor readings from multiple 18-bit ADC channels into a single serial stream for transmission over RS-485. IC Role / Device Role / Timing Role: SN74ALVC7803-40DL aggregates parallel ADC outputs into a depth-managed queue, synchronized to a master controller's RDCLK for deterministic packetization. Use Value: Enables deterministic jitter-free data packaging; IR flag signals when space is available for next ADC sample, preventing sample loss during communication bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT7803-40DL | 5-V TTL-compatible version; higher drive (IOH = –24 mA / IOL = 24 mA); 12 ns access time; same pinout and functionality. | Requires 4.5–5.5 V supply; incompatible with 3.3-V-only systems; higher power consumption. | Select SN74ACT7803-40DL only for existing 5-V designs needing identical timing and footprint; not suitable for mixed-voltage or low-power 3.3-V systems. |
| 72V255L15TF | 3.3-V LVDS FIFO; 512 × 18; 15 ns access; different pinout (64-pin TQFP); supports LVDS I/O and built-in PLL for clock multiplication. | Designed for high-noise industrial environments; requires LVDS termination; no IR/OR flag synchronization to clocks. | Choose 72V255L15TF for noise-immune, long-cable applications where LVDS signaling is mandated; avoid if board space or 56-pin DL footprint is fixed. |
Compared with SN74ACT7803-40DL and 72V255L15TF, the SN74ALVC7803-40DL uniquely balances 3.3-V compatibility, pin-for-pin upgrade path from 5-V predecessors, and clock-synchronized ready flags - making it optimal for cost-sensitive, space-constrained 3.3-V embedded interfaces requiring deterministic handshaking.
Availability
SN74ALVC7803-40DL is available at Aetrix Electronics and suitable for high-speed digital interface bridging, clock-domain crossing in DSP/FPGA systems, video pixel buffering, and industrial data aggregation requiring stable component supply and long-term lifecycle support.
Supply support for SN74ALVC7803-40DL 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALVC7803-40DL belongs to TI's ALVC advanced low-voltage CMOS logic family, engineered specifically for 3.3-V systems requiring high-speed, low-power, and robust clock-domain crossing capabilities in space-constrained designs.
FAQ
What is the maximum supported clock frequency for SN74ALVC7803-40DL?
The SN74ALVC7803-40DL is characterized for operation up to 40 MHz on both WRTCLK and RDCLK under recommended conditions (VCC = 3.3 V ±0.3 V, CL = 50 pF, TA = 0°C to 70°C). This 40-MHz rating is confirmed in the switching characteristics table of the SDAS274 datasheet and reflects worst-case timing across voltage and temperature.
Does SN74ALVC7803-40DL require a power-on reset?
Yes, SN74ALVC7803-40DL must be reset upon power-up. The FIFO must undergo a valid reset sequence - asserting RESET low while at least four rising edges occur on both WRTCLK and RDCLK - to initialize IR, OR, and HF flags and clear internal pointers. Failure to do so may result in undefined flag states and unpredictable data output.
How is the AF/AE flag programmed on SN74ALVC7803-40DL?
The AF/AE flag offsets (X for almost-empty, Y for almost-full) are programmed on SN74ALVC7803-40DL by holding PEN low during the second WRTCLK↑ after reset, which latches D0–D7 as X; a subsequent PEN low on the next WRTCLK↑ latches D0–D7 as Y. Programming occurs before the first write and disables writes until complete.
Can SN74ALVC7803-40DL be used in bidirectional configurations?
Yes, SN74ALVC7803-40DL supports bidirectional data buffering without additional logic. Two devices can be interconnected - one handling forward direction (WRTCLK = system A, RDCLK = system B), the other reverse (WRTCLK = system B, RDCLK = system A) - enabling full-duplex asynchronous communication between clock domains.
What package type does SN74ALVC7803-40DL use?
SN74ALVC7803-40DL uses a 56-pin shrink small-outline (DL) package with 300-mil body width and 25-mil lead pitch, per JEDEC MO-118. This surface-mount package offers 40% smaller PCB area than standard SOIC and is pin-compatible with SN74ACT7803-40DL for drop-in 3.3-V upgrades.
SN74ALVC7803-40DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 9K (512 x 18)
- Function:
- Synchronous
- Data Rate:
- 25MHz
- Access Time:
- 20ns
- Voltage - Supply:
- 3 V ~ 3.6 V
- Current - Supply (Max):
- 40µA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ALVC7803-40DL FAQ
1.How can I place an order for SN74ALVC7803-40DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC7803-40DL 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 SN74ALVC7803-40DL reliable?
The price and inventory of SN74ALVC7803-40DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC7803-40DL is usually 5 days.
3.What payment methods are accepted for SN74ALVC7803-40DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC7803-40DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC7803-40DL?
SN74ALVC7803-40DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC7803-40DL 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 SN74ALVC7803-40DL?
For technical support, including SN74ALVC7803-40DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC7803-40DL requirements.
6.How does Aetrix verify that SN74ALVC7803-40DL is sourced from the original manufacturer or authorized distributors?
All SN74ALVC7803-40DL 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 SN74ALVC7803-40DL meets industry standards.
7.What is the process for return or replacement of SN74ALVC7803-40DL?
All SN74ALVC7803-40DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC7803-40DL, 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 SN74ALVC7803-40DL part is unused and in its original packaging.
Return procedure for SN74ALVC7803-40DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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