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Home > Products > Integrated Circuits (ICs) > Logic > FIFOs Memory

Texas Instruments SN74ALVC7803-20DL

Name: SN74ALVC7803-20DL
Brand: Texas Instruments
SKU: SN74ALVC7803-20DL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALVC7803-20DL

Manufacturer:: Texas Instruments

Category:: FIFOs Memory

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: SN74ALVC7803-20DL.pdf

Description:: IC FIFO SYNC 512X18 13NS 56SSOP

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Product details

Overview

SN74ALVC7803-20DL 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 50 MHz read/write clocks, delivers 13 ns access time with 50-pF load, and features synchronized input-ready (IR) and output-ready (OR) flags - used in high-speed serial interface bridging and protocol translation.

For engineers reviewing the SN74ALVC7803-20DL datasheet, SN74ALVC7803-20DL pinout, SN74ALVC7803-20DL application, or SN74ALVC7803-20DL equivalent, key selection criteria include its dual-clock synchronization capability, programmable almost-full/almost-empty flag offsets, bidirectional configuration support without external logic, and compatibility with 3.3-V system interfaces requiring deterministic latency and depth-controlled flow control.

Technical Context

The SN74ALVC7803-20DL implements a synchronous dual-port RAM-based FIFO with independent write and read pointer logic, status-flag generation circuitry, and output-enable-controlled 3-state outputs. Its architecture separates write enable (WRTEN1/WRTEN2), read enable (RDEN/OE1/OE2), and clock domains (WRTCLK/RDCLK), enabling true asynchronous operation across clock boundaries.

Flag logic includes half-full (HF), input-ready (IR), output-ready (OR), and programmable almost-full/almost-empty (AF/AE) signals - all edge-synchronized to their respective clocks. The AF/AE offset values (X/Y) are latched via D0–D7 during reset using PEN, supporting configurable buffer thresholding without firmware intervention.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width	512 × 18 bits - provides 9.2-kbit buffering capacity for wide parallel data paths, sufficient for multi-cycle burst transfers in video or packetized communication systems.
Supply Voltage Range	3.0 V to 3.6 V - compatible with standard 3.3-V logic families and LDO-regulated embedded power rails.
Max Clock Frequency	50 MHz - enables real-time buffering of high-speed serial-to-parallel conversion streams (e.g., USB 2.0 PHY interface, LVDS deserialization).
Access Time	13 ns (CL = 50 pF, all outputs switching) - ensures sub-20-ns latency from clock edge to valid output, critical for timing-critical handshake protocols.
Input/Output Flags	IR (synchronized to WRTCLK), OR (synchronized to RDCLK), HF, AF/AE - provide deterministic, glitch-free handshaking signals aligned to local clock domains.
Programmable AF/AE Offsets	X/Y default = 64 words; programmable via D0–D7 and PEN - allows runtime-tunable buffer occupancy thresholds for adaptive flow control in variable-rate systems.
Reset Requirement	Asynchronous RESET requiring ≥4 rising edges on both WRTCLK and RDCLK - guarantees full internal register initialization before first use, preventing undefined flag states at power-up.

Pinout & Package

Packaged in a 56-pin shrink small-outline (DL) package with 25-mil center-to-center lead spacing, the SN74ALVC7803-20DL occupies significantly less PCB area than DIP, PLCC, or standard SOIC alternatives while maintaining mechanical robustness for industrial assembly.

Pin/Terminal	Circuit Role	Design Meaning
RESET (1)	Asynchronous reset input	Must be held low while ≥4 rising edges occur on both WRTCLK and RDCLK to initialize IR, OR, HF low and AF/AE high.
WRTCLK (25), RDCLK (32)	Free-running write/read clocks	Independent, asynchronous or coincident clocks; rising-edge triggered for write/read operations and flag synchronization.
WRTEN1 (27), WRTEN2 (26), RDEN (31), OE1 (56), OE2 (30)	Enable controls	WRTEN1 high + WRTEN2 low + IR high enables write; RDEN/OE1/OE2 low + OR high enables read and output drive.
D0–D17 (2–21, 11–14, 9–12)	18-bit parallel data input	Accepts 18-bit word on WRTCLK↑ when write conditions met; D0–D7 also used to program AF/AE offsets during reset.
Q0–Q17 (33–34, 36–38, 40–43, 45–49, 51, 53–55)	18-bit parallel data output	Drives 18-bit word on RDCLK↑ when read conditions met; outputs enter high-Z when OE1 or OE2 is high.
IR (28), OR (29), HF (22), AF/AE (24)	Status flags	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)	Program enable	Latches D0–D7 as AF/AE offset value on next WRTCLK↑ after reset; must be high to retain default X=Y=64.

Key Features

Feature	Design Value
Bidirectional data buffering	Two SN74ALVC7803-20DL devices can be interconnected without additional logic to implement full-duplex 18-bit channel with independent read/write clocks on each side.
Width expansion support	Multiple SN74ALVC7803-20DL units can be stacked to form 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 WRTCLK and RDCLK respectively, eliminating metastability risk and enabling direct connection to flip-flop inputs in synchronous logic.
Low-power advanced CMOS	Quiescent ICC ≈ 40 µA; dynamic current scales with clock frequency and switching activity - suitable for battery-backed or thermally constrained applications.
Pin compatibility	Pin-for-pin compatible with SN74ACT7803, enabling drop-in upgrade from 5-V TTL to 3.3-V CMOS operation without PCB redesign.

Applications

High-Speed Serial Interface Bridging	Protocol Translation Buffering
Use Scenario: Bridging between a 50-MHz LVDS serializer and a 33-MHz parallel microcontroller bus where clocks are unrelated and data bursts require depth-controlled buffering. IC Role / Device Role / Timing Role: SN74ALVC7803-20DL acts as a clock-domain crossing FIFO, absorbing jitter and rate mismatches while providing IR/OR handshaking to coordinate transfers. Use Value: Eliminates need for custom state-machine arbitration logic; 512-word depth prevents overflow under worst-case burst conditions; 13-ns access ensures minimal latency insertion.	Use Scenario: Converting UART-based command streams (asynchronous, variable bit rate) into fixed-width packets for DSP processing with deterministic timing constraints. IC Role / Device Role / Timing Role: SN74ALVC7803-20DL buffers incoming byte-aligned data and presents it as 18-bit words synchronized to the DSP's system clock, using OR flag for ready detection. Use Value: Enables seamless integration of legacy serial peripherals into synchronous processing pipelines; programmable AF/AE supports adaptive backpressure signaling to upstream UART controller.
Video Data Pipeline Synchronization	Industrial Fieldbus Gateway Buffering
Use Scenario: Aligning pixel data from a 72-MHz image sensor interface with a 60-MHz display controller clock domain in an embedded vision system. IC Role / Device Role / Timing Role: SN74ALVC7803-20DL serves as a line-buffer FIFO, accepting 18-bit RGB+sync data on sensor clock and releasing it on display clock with HF flag triggering line-start interrupts. Use Value: Prevents frame tearing or dropped lines due to clock skew; half-full flag provides precise mid-buffer interrupt point for DMA reload coordination.	Use Scenario: Isolating Modbus RTU master polling cycles from CANopen slave response timing in an industrial gateway, where message lengths and response latencies vary widely. IC Role / Device Role / Timing Role: SN74ALVC7803-20DL decouples the deterministic polling schedule of the master CPU from the variable-latency responses of fieldbus slaves using independent read/write clocks. Use Value: Guarantees no message loss during transient bus congestion; AF/AE flag triggers software throttling before FIFO underflow/overflow occurs.

High-Speed Serial Interface Bridging

Protocol Translation Buffering

Use Scenario: Bridging between a 50-MHz LVDS serializer and a 33-MHz parallel microcontroller bus where clocks are unrelated and data bursts require depth-controlled buffering.

IC Role / Device Role / Timing Role: SN74ALVC7803-20DL acts as a clock-domain crossing FIFO, absorbing jitter and rate mismatches while providing IR/OR handshaking to coordinate transfers.

Use Value: Eliminates need for custom state-machine arbitration logic; 512-word depth prevents overflow under worst-case burst conditions; 13-ns access ensures minimal latency insertion.

Use Scenario: Converting UART-based command streams (asynchronous, variable bit rate) into fixed-width packets for DSP processing with deterministic timing constraints.

IC Role / Device Role / Timing Role: SN74ALVC7803-20DL buffers incoming byte-aligned data and presents it as 18-bit words synchronized to the DSP's system clock, using OR flag for ready detection.

Use Value: Enables seamless integration of legacy serial peripherals into synchronous processing pipelines; programmable AF/AE supports adaptive backpressure signaling to upstream UART controller.

Video Data Pipeline Synchronization

Industrial Fieldbus Gateway Buffering

Use Scenario: Aligning pixel data from a 72-MHz image sensor interface with a 60-MHz display controller clock domain in an embedded vision system.

IC Role / Device Role / Timing Role: SN74ALVC7803-20DL serves as a line-buffer FIFO, accepting 18-bit RGB+sync data on sensor clock and releasing it on display clock with HF flag triggering line-start interrupts.

Use Value: Prevents frame tearing or dropped lines due to clock skew; half-full flag provides precise mid-buffer interrupt point for DMA reload coordination.

Use Scenario: Isolating Modbus RTU master polling cycles from CANopen slave response timing in an industrial gateway, where message lengths and response latencies vary widely.

IC Role / Device Role / Timing Role: SN74ALVC7803-20DL decouples the deterministic polling schedule of the master CPU from the variable-latency responses of fieldbus slaves using independent read/write clocks.

Use Value: Guarantees no message loss during transient bus congestion; AF/AE flag triggers software throttling before FIFO underflow/overflow occurs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT7803	5-V TTL-compatible; higher ICC (≈10 mA typical), slower access (20 ns), same pinout and functional behavior.	Requires 5-V supply rail and drives heavier loads; unsuitable for mixed-voltage 3.3-V systems without level shifting.	Select SN74ACT7803 only when legacy 5-V infrastructure mandates TTL-level compatibility and power budget permits higher static draw.
IDT72V251L15TPG	3.3-V, 512 × 18, 15-ns access, JTAG-configurable flags, different pinout (64-pin TQFP), supports auto-retransmit mode.	Offers enhanced diagnostics and programmable timing modes but requires PCB redesign and new layout due to non-pin-compatible footprint.	Choose IDT72V251L15TPG when advanced debug visibility, retransmission capability, or tighter timing margin (15 ns vs. 13 ns) is required and board revision is feasible.

Compared with SN74ACT7803 and IDT72V251L15TPG, the SN74ALVC7803-20DL delivers optimal balance of low-voltage operation, proven pin compatibility, and deterministic 13-ns latency - making it ideal for cost-sensitive, space-constrained upgrades from 5-V FIFOs or drop-in replacements where layout reuse is mandatory.

Availability

SN74ALVC7803-20DL is available at Aetrix Electronics and suitable for high-speed serial interface bridging, protocol translation buffering, video pipeline synchronization, and industrial fieldbus gateway applications requiring stable component supply and long-term manufacturing continuity.

Supply support for SN74ALVC7803-20DL 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 leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface and memory products.

The SN74ALVC7803-20DL belongs to TI's ALVC advanced low-voltage CMOS logic family, engineered specifically for 3.3-V system interfacing with emphasis on low power, high speed, and robust noise immunity in mixed-signal environments.

FAQ

What is the minimum number of clock edges required to properly reset the SN74ALVC7803-20DL?

The SN74ALVC7803-20DL requires at least four rising edges on both WRTCLK and RDCLK while RESET is asserted low to fully initialize internal synchronizers and flags. This ensures IR, OR, and HF go low and AF/AE goes high. Failure to meet this condition may leave the FIFO in an undefined state, risking incorrect flag behavior or data corruption during initial operation of the SN74ALVC7803-20DL.

How does the AF/AE flag behave by default, and how is it programmed on the SN74ALVC7803-20DL?

By default, the AF/AE flag on the SN74ALVC7803-20DL uses X = Y = 64, meaning it asserts high when the FIFO contains ≤64 words (almost empty) or ≥448 words (almost full). Programming occurs after reset and before the first write: set PEN low, then apply desired 8-bit offset value on D0–D7 and pulse WRTCLK↑ once to latch X, then pulse again to latch Y. The SN74ALVC7803-20DL retains these values until next reset.

Can the SN74ALVC7803-20DL operate with coincident read and write clocks, and what timing constraints apply?

Yes, the SN74ALVC7803-20DL explicitly supports coincident WRTCLK and RDCLK - both clocks may share the same source or be phase-aligned. However, setup/hold times must still be met: WRTEN1/WRTEN2 must be stable ≥5 ns before WRTCLK↑, and OE1/OE2/RDEN ≥5 ns before RDCLK↑. The SN74ALVC7803-20DL's dual-clock architecture ensures correct operation regardless of relative clock phase, provided timing margins are observed.

What is the function of the PEN pin on the SN74ALVC7803-20DL, and when must it be used?

The PEN (Program Enable) pin on the SN74ALVC7803-20DL controls latching of AF/AE offset values from D0–D7 into internal registers. It must be driven low only after RESET deassertion and before the first write cycle - holding PEN high retains the default X=Y=64. During programming, each WRTCLK↑ edge captures one byte: first for X (almost-empty), second for Y (almost-full). PEN has no function once the FIFO begins normal operation, and misuse can lock the SN74ALVC7803-20DL into unintended flag thresholds.

Is the SN74ALVC7803-20DL pin-compatible with any other FIFO devices, and what does that mean for design reuse?

Yes, the SN74ALVC7803-20DL is pin-compatible with the SN74ACT7803, sharing identical pin count, pinout, and functional mapping. This allows direct replacement in existing 5-V designs upgraded to 3.3-V operation without PCB changes - provided voltage translation is handled externally or the system supports mixed-supply I/O. The SN74ALVC7803-20DL maintains full functional equivalence, including flag behavior, reset sequence, and width expansion capability.

SN74ALVC7803-20DL 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:: 50MHz

Access Time:: 13ns

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

SN74ALVC7803-20DL FAQ

1.How can I place an order for SN74ALVC7803-20DL through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVC7803-20DL 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 SN74ALVC7803-20DL reliable?

The price and inventory of SN74ALVC7803-20DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC7803-20DL is usually 5 days.

3.What payment methods are accepted for SN74ALVC7803-20DL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC7803-20DL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALVC7803-20DL?

SN74ALVC7803-20DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVC7803-20DL 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 SN74ALVC7803-20DL?

For technical support, including SN74ALVC7803-20DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC7803-20DL requirements.

6.How does Aetrix verify that SN74ALVC7803-20DL is sourced from the original manufacturer or authorized distributors?

All SN74ALVC7803-20DL 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 SN74ALVC7803-20DL meets industry standards.

7.What is the process for return or replacement of SN74ALVC7803-20DL?

All SN74ALVC7803-20DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC7803-20DL, 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 SN74ALVC7803-20DL part is unused and in its original packaging.

Return procedure for SN74ALVC7803-20DL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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