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Texas Instruments SN74ALVC7804-25DLR
- Part No.:
- SN74ALVC7804-25DLR
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC7804-25DLR.pdf
- Description:
- IC FIFO ASYNC 512X18 56SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALVC7804-25DLR from Texas Instruments is a 512 × 18-bit asynchronous FIFO memory IC designed for high-speed data buffering in mixed-clock-domain interfaces. It operates at 3.0–3.6 V, delivers 18 ns access time with 50-pF load, supports up to 40 MHz clock rates, and features programmable almost-full/almost-empty flags. It is used in digital video frame buffering, serial-to-parallel protocol bridging, and real-time data acquisition systems where write/read clocks are independent.
For engineers reviewing the SN74ALVC7804-25DLR datasheet, SN74ALVC7804-25DLR pinout, SN74ALVC7804-25DLR application, or SN74ALVC7804-25DLR equivalent, key selection criteria include its 56-pin SSOP (DL) package, 3-state outputs with OE control, full/empty/half-full status flags, and programmable AF/AE offset values via D0–D7 during reset sequence.
Technical Context
The SN74ALVC7804-25DLR implements a dual-pointer RAM-based FIFO architecture with independent load clock (LDCK) and unload clock (UNCK), enabling true asynchronous operation between write and read domains. Its status logic generates FULL, EMPTY, HF, and programmable AF/AE flags based on internal word count comparisons against fixed (256) or user-defined thresholds (X/Y).
It uses low-power advanced CMOS technology with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 3.3 V), 3-state output drivers capable of ±16 mA sink/source, and supports simultaneous switching of all 18 Q outputs with guaranteed 18 ns access under 50-pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 512 × 18-bit - provides 9,216 bits of buffer storage for bit-parallel data streams |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3-V system rails and tolerant of typical board-level noise margins |
| Max Clock Frequency | 40 MHz - enables sustained data throughput of 720 Mbps (40 MHz × 18 bits) |
| Access Time | 18 ns - ensures deterministic latency for time-critical buffering in video/audio pipelines |
| Status Flags | FULL, EMPTY, HF, AF/AE - enable hardware handshaking without CPU polling overhead |
| Programmable AF/AE | X/Y offsets set via D0–D7 at reset - allows custom flow-control thresholds for application-specific backpressure |
| Output Drive | ±16 mA (IOL/IOH) - drives standard 50-pF loads and multiple CMOS inputs without external buffers |
Pinout & Package
Packaged in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil center-to-center lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET (1) | Asynchronous reset input | Drives FULL high, EMPTY low, HF low, AF/AE high; required at power-up to initialize pointers |
| LDCK (25) | Load clock input | Rising-edge-triggered write strobe; data latched from D0–D17 only when FULL = high |
| UNCK (32) | Unload clock input | Rising-edge-triggered read strobe; data appears on Q0–Q17 only when EMPTY = high |
| OE (56) | Output enable input | Active-low control: Q outputs enter high-Z when OE = high; enables bus sharing |
| PEN (23) | Program enable input | Low during reset enables loading of AF/AE offset values X/Y from D0–D7 on next LDCK↑ |
| D0–D17 (2–21, 11–12, 9–2) | Data input bus | 18-bit parallel input port; D0–D7 also carry X/Y programming data when PEN is active |
| Q0–Q17 (33–34, 36–38, 40–43, 45–49, 51, 53–55) | Data output bus | 18-bit parallel output port with 3-state control; outputs retain last valid word until next UNCK↑ |
| FULL (28), EMPTY (29), HF (22), AF/AE (24) | Status flag outputs | Open-drain-compatible active-low (FULL/EMPTY) or programmable logic-level flags for real-time buffer monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous dual-clock interface | Enables seamless bridging between independent clock domains (e.g., USB host clock ↔ FPGA logic clock) |
| Programmable AF/AE thresholds | Allows fine-grained flow control tuning-e.g., set X=16/Y=32 to trigger backpressure before overflow or underflow |
| Hardware status flags | Eliminates software polling: FULL/EMPTY/HF provide immediate visibility into buffer occupancy without CPU cycles |
| 18 ns access with 50-pF load | Meets timing closure in 25-MHz+ systems with minimal board-level trace length constraints |
| Pin compatibility with SN74ACT7804 | Permits drop-in upgrade from 5-V TTL-based FIFOs to 3.3-V low-power operation without PCB redesign |
Applications
| Video Frame Buffering | Serial-to-Parallel Protocol Bridge |
|---|---|
Use Scenario: Buffering uncompressed YUV422 video lines between a camera sensor running at 74.25 MHz and a baseband processor operating at 100 MHz. IC Role / Device Role / Timing Role: Asynchronous FIFO decouples pixel clock domain from processing clock domain while preserving line integrity and minimizing jitter. Use Value: Prevents frame tearing or dropped lines by absorbing clock skew; 512-word depth accommodates one full HD line (1920 pixels × 2 bytes). | Use Scenario: Converting UART-sourced telemetry data (8-N-1, 115.2 kbps) into parallel 16-bit words for DSP ingestion. IC Role / Device Role / Timing Role: Serial receiver fills FIFO on UART RX clock; DSP reads burst-aligned 16-bit words on its own clock, using EMPTY/FULL flags for flow control. Use Value: Eliminates UART overrun errors and DSP wait states; programmable AF/AE enables early warning before buffer exhaustion. |
| Real-Time Data Acquisition | Industrial Fieldbus Gateway |
Use Scenario: Capturing synchronized analog channel samples from a 1 MSPS ADC array feeding an FPGA for FFT analysis. IC Role / Device Role / Timing Role: FIFO absorbs bursty ADC sampling clock (1 MHz) and presents steady 50-MHz parallel stream to FPGA fabric. Use Value: Guarantees no sample loss during FPGA reconfiguration or DMA arbitration; HF flag triggers DMA request at 50% fill level. | Use Scenario: Interfacing Modbus RTU (RS-485) master to CAN FD controller in a factory automation gateway. IC Role / Device Role / Timing Role: Stores incoming Modbus frames in FIFO until CAN FD controller is ready; FULL flag halts RS-485 reception to prevent overrun. Use Value: Enables deterministic inter-protocol translation without software intervention; 3-state outputs allow shared data bus with other peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVC7804-40DLR | Same 512×18 architecture but rated for 40 MHz max clock (vs. 25 MHz for -25 variant); identical pinout and voltage specs | Suitable for higher-throughput systems requiring >25 MHz operation; shares same layout and firmware interface | Select when clock frequency exceeds 25 MHz; otherwise -25DLR offers better power efficiency at lower speeds |
| 72V225L15TF | 3.3-V 512×18 FIFO from IDT; 15 ns access, LVCMOS I/O, different pin assignment (e.g., OE on Pin 1, not 56) | Requires PCB redesign due to non-pin-compatible layout; supports lower supply noise sensitivity (±50 mV) | Choose only if 15 ns access or tighter supply tolerance is critical; not a drop-in replacement |
Compared with SN74ALVC7804-40DLR, the SN74ALVC7804-25DLR trades 15 MHz of maximum clock headroom for lower dynamic power and reduced timing margin pressure; compared with 72V225L15TF, it offers direct pin compatibility with legacy TI designs but requires careful attention to OE placement and reset timing sequencing.
Availability
SN74ALVC7804-25DLR is available at Aetrix Electronics and suitable for industrial fieldbus gateways, real-time data acquisition systems, and video frame buffering applications requiring stable component supply across multi-year production cycles.
Supply support for SN74ALVC7804-25DLR 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 90 years of innovation in high-reliability components.
The SN74ALVC7804-25DLR belongs to TI's ALVC logic family-designed specifically for low-voltage, high-speed asynchronous buffering in mixed-signal and communications infrastructure equipment.
FAQ
What is the minimum pulse width required for LDCK and UNCK on the SN74ALVC7804-25DLR?
The SN74ALVC7804-25DLR requires a minimum pulse width of 8 ns for both LDCK and UNCK signals under recommended operating conditions (VCC = 3.3 V ± 0.3 V). This specification ensures reliable edge detection and avoids metastability in the internal pointer logic. The value is verified in the "Recommended Operating Conditions" table of the SCAS432 datasheet and applies regardless of whether clocks are coincident or asynchronous. Always maintain this minimum width in timing-critical paths involving SN74ALVC7804-25DLR.
How does the AF/AE flag behave after reset on the SN74ALVC7804-25DLR?
After reset, the AF/AE flag on the SN74ALVC7804-25DLR is driven high by default, indicating either almost-empty or almost-full condition depending on programmed X/Y values. If PEN remains high during reset, the default offset values (X = Y = 64) apply, so AF/AE goes high when FIFO contains ≤64 or ≥448 words. The flag remains high until the first LDCK↑ event (if PEN is low) or until the FIFO reaches those thresholds during normal operation. This behavior is explicitly defined in the Terminal Functions section of the SN74ALVC7804-25DLR datasheet.
Can SN74ALVC7804-25DLR operate with 2.5-V supply voltage?
No, the SN74ALVC7804-25DLR is not rated for 2.5-V operation. Its absolute maximum rating allows VCC down to –0.5 V, but the recommended operating range is strictly 3.0 V to 3.6 V. At 2.5 V, input thresholds (VIH = 2.0 V min) become non-functional, output drive strength collapses, and timing parameters like tpd and fmax are no longer guaranteed. TI specifies no characterization data below 3.0 V for SN74ALVC7804-25DLR, and attempting 2.5-V use risks metastability, data corruption, or failure to assert FULL/EMPTY flags correctly.
What happens to Q outputs during reset on the SN74ALVC7804-25DLR?
During reset, the Q outputs of the SN74ALVC7804-25DLR are not forced to any defined logic state-their values remain indeterminate and reflect the last latched data or floating bus conditions. Only the internal pointers, FULL, EMPTY, HF, and AF/AE flags are initialized (FULL = high, EMPTY = low, HF = low, AF/AE = high). To ensure known Q output states, external pull-up/down resistors or post-reset dummy reads must be implemented. This behavior is documented in the "description" section of the SN74ALVC7804-25DLR datasheet.
Is SN74ALVC7804-25DLR pin-compatible with SN74ACT7804?
Yes, the SN74ALVC7804-25DLR is explicitly pin-compatible with SN74ACT7804 as stated in the datasheet: "Pin Compatible With SN74ACT7804". Both devices share identical 56-pin DL package footprint, terminal numbering, and signal assignments-including RESET, LDCK, UNCK, OE, PEN, D0–D17, Q0–Q17, and all status flags. However, voltage levels differ: SN74ACT7804 is 5-V TTL, while SN74ALVC7804-25DLR is 3.3-V CMOS, requiring level-shifting if interfaced with 5-V logic.
SN74ALVC7804-25DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 9K (512 x 18)
- Function:
- Asynchronous
- Data Rate:
- 40MHz
- Access Time:
- 18ns
- 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
SN74ALVC7804-25DLR FAQ
1.How can I place an order for SN74ALVC7804-25DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC7804-25DLR 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 SN74ALVC7804-25DLR reliable?
The price and inventory of SN74ALVC7804-25DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC7804-25DLR is usually 5 days.
3.What payment methods are accepted for SN74ALVC7804-25DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC7804-25DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC7804-25DLR?
SN74ALVC7804-25DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC7804-25DLR 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 SN74ALVC7804-25DLR?
For technical support, including SN74ALVC7804-25DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC7804-25DLR requirements.
6.How does Aetrix verify that SN74ALVC7804-25DLR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC7804-25DLR 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 SN74ALVC7804-25DLR meets industry standards.
7.What is the process for return or replacement of SN74ALVC7804-25DLR?
All SN74ALVC7804-25DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC7804-25DLR, 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 SN74ALVC7804-25DLR part is unused and in its original packaging.
Return procedure for SN74ALVC7804-25DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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