My Inquiry
My Account
Texas Instruments SN74ALVC7804-40DLR
- Part No.:
- SN74ALVC7804-40DLR
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC7804-40DLR.pdf
- Description:
- IC FIFO ASYNC 512X18 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ALVC7804-40DLR from Texas Instruments is a 512 × 18-bit asynchronous/synchronous FIFO memory IC operating at 3.0–3.6 V, delivering 40 MHz data rates, 18 ns access time (with 50-pF load), and full/empty/half-full/programmable almost-full/almost-empty flags. It serves as a bit-parallel data buffer in high-speed digital interfaces between mismatched clock domains.
For engineers reviewing the SN74ALVC7804-40DLR datasheet, SN74ALVC7804-40DLR pinout, SN74ALVC7804-40DLR application, or SN74ALVC7804-40DLR equivalent, key selection criteria include its 56-pin SSOP (DL) package, dual-clock architecture (LDCK/UNCK), 3-state outputs with OE control, and programmable AF/AE flag offsets for custom depth thresholds.
Technical Context
The SN74ALVC7804-40DLR implements a 512-word × 18-bit static RAM core with independent write and read pointer logic, supporting fully asynchronous or coincident load/unload clock operation. Its status flag generation circuitry includes dedicated FULL, EMPTY, HF, and AF/AE outputs driven by real-time word-count comparison logic.
Flag behavior is deterministic: FULL goes low at exactly 512 words written, EMPTY goes low at zero words remaining, HF asserts high at ≥256 words, and AF/AE is programmable via D0–D7 latching on LDCK edges when PEN is low - enabling configurable depth-triggered signaling without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 512 × 18 bits - supports buffering of 512 parallel 18-bit words before overflow |
| Max Clock Frequency | 40 MHz - enables sustained data throughput up to 720 Mbps (40 MHz × 18 bits) |
| Access Time | 18 ns (CL = 50 pF, all outputs switching) - ensures timing closure in sub-25 ns system cycles |
| Supply Voltage Range | 3.0 V to 3.6 V - compatible with 3.3-V LVTTL and ALVC logic families |
| I/O Drive Strength | IOH = –8 mA / IOL = 16 mA at VCC = 3 V - drives standard 50-pF loads with clean edges |
| Propagation Delay | tpd(LDCK↑→Q) = 9–24 ns - defines minimum clock-to-output latency for write-read synchronization |
| Power Dissipation | Cpd = 53 pF per channel - enables accurate dynamic power estimation at 5 MHz toggle rate |
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/AF/AE high and EMPTY/HF low; required at power-up to initialize pointers |
| LDCK (25) | Load clock input | Rising-edge-triggered write strobe; disabled when FULL is low |
| UNCK (32) | Unload clock input | Rising-edge-triggered read strobe; disabled when EMPTY is low |
| D0–D17 (2–21,12–11,9–2) | Data input bus | 18-bit parallel input port; used to program AF/AE offsets when PEN is low |
| Q0–Q17 (33–34,36–38,40–43,45–49,51,53–55) | Data output bus | 18-bit 3-state output port; high-impedance when OE is high |
| OE (56) | Output enable | Active-low control for Q0–Q17 tri-state; allows bus sharing without external logic |
| PEN (23) | Program enable | Enables latching of D0–D7 as AF/AE offset values on next LDCK edge after reset |
| FULL (28), EMPTY (29), HF (22), AF/AE (24) | Status flag outputs | Open-drain-compatible active-low/full, active-low/empty, active-high/half-full, and programmable flag |
Key Features
| Feature | Design Value |
|---|---|
| Programmable AF/AE flag | Allows user-defined almost-full (Y) and almost-empty (X) thresholds (0–255) via D0–D7 latching, eliminating need for external counter logic |
| Dual independent clocks | LDCK and UNCK operate asynchronously or synchronously - supports bridging of unrelated clock domains (e.g., 25 MHz ↔ 40 MHz) |
| Full set of status flags | FULL, EMPTY, HF, and AF/AE provide immediate visibility into FIFO occupancy without polling or address calculation |
| 3.3-V optimized ALVC process | Delivers 18 ns access time and 40 MHz operation while maintaining <40 µA ICC quiescent current at 3.6 V |
| Pin compatibility | Direct replacement for SN74ACT7804 in same DL package - enables drop-in upgrade from ACT to lower-power ALVC family |
Applications
| High-Speed Data Acquisition Interface | Multi-Protocol Serial Bridge |
|---|---|
Use Scenario: Capturing bursts of sensor data from ADCs running at 40 MHz into a slower microcontroller bus operating at 12 MHz. IC Role / Device Role / Timing Role: SN74ALVC7804-40DLR acts as a depth-512 elastic buffer, absorbing clock domain skew and preventing sample loss during backpressure. Use Value: Eliminates FIFO overflow errors and enables continuous streaming without CPU intervention, leveraging FULL/EMPTY flags for autonomous DMA triggering. | Use Scenario: Interfacing UART, SPI, and I²C peripherals to a central SoC with non-matching clock domains and variable transaction lengths. IC Role / Device Role / Timing Role: SN74ALVC7804-40DLR provides isolated 18-bit-wide data staging between protocol engines, decoupling handshake timing. Use Value: Prevents bus contention and protocol timeouts by absorbing transient rate mismatches; AF/AE flags signal host firmware to initiate read/write before underflow/overflow. |
| Video Pixel Pipeline Buffer | Industrial PLC I/O Expansion |
Use Scenario: Temporarily storing 18-bit RGB pixel data from a 40 MHz image sensor before compression or display timing alignment. IC Role / Device Role / Timing Role: SN74ALVC7804-40DLR serves as a line-buffer FIFO in pixel clock domain translation (e.g., 40 MHz sensor → 27 MHz display controller). Use Value: Maintains pixel integrity across clock boundaries with guaranteed 18 ns access, enabling glitch-free video streaming without frame drops. | Use Scenario: Aggregating real-time analog/digital I/O status updates from distributed field modules into a centralized PLC backplane operating at different scan rates. IC Role / Device Role / Timing Role: SN74ALVC7804-40DLR buffers 18-bit I/O snapshots from remote nodes, synchronized via LDCK, and released on demand via UNCK. Use Value: Enables deterministic scan-cycle timing and fault-tolerant communication; HF flag triggers batch reads every 256 samples for efficient bus utilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVC7804-25DL | Same 512×18 architecture and pinout; rated for 25 MHz max clock frequency and 22 ns access time | Suitable for cost-sensitive designs where 40 MHz bandwidth is unnecessary; lower speed grade reduces dynamic power | Select when system clock ≤25 MHz and timing margin allows longer access delay |
| SN74ACT7804-25DL | Pin-compatible 512×18 FIFO but built on ACT (TTL-compatible) process; requires 4.5–5.5 V supply and draws higher ICC | Legacy 5-V systems requiring direct replacement without voltage translation; not suitable for 3.3-V-only designs | Choose only for backward compatibility in existing 5-V ACT-based boards; not recommended for new 3.3-V designs |
Compared with SN74ALVC7804-25DL and SN74ACT7804-25DL, the SN74ALVC7804-40DLR delivers highest throughput (40 MHz) and lowest voltage operation (3.0–3.6 V) in the same DL package, making it optimal for modern low-voltage, high-bandwidth buffering where timing margin is critical.
Availability
SN74ALVC7804-40DLR is available at Aetrix Electronics and suitable for high-speed data acquisition interfaces, multi-protocol serial bridges, and industrial I/O expansion systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALVC7804-40DLR 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 decades of leadership in high-reliability interface and memory products.
The SN74ALVC7804-40DLR belongs to TI's ALVC advanced low-voltage CMOS logic family, designed specifically for 3.3-V systems demanding high-speed, low-power, and robust noise immunity in industrial and communications infrastructure.
FAQ
What is the maximum data rate supported by the SN74ALVC7804-40DLR?
The SN74ALVC7804-40DLR supports a maximum clock frequency of 40 MHz on both LDCK and UNCK inputs, enabling sustained data transfer rates up to 720 Mbps (40 MHz × 18 bits). This rating is verified under recommended operating conditions (VCC = 3.3 V ± 0.3 V, TA = 0°C to 70°C, CL = 50 pF), and matches the -40 speed grade designation in the part number SN74ALVC7804-40DLR.
How does the programmable AF/AE flag work on the SN74ALVC7804-40DLR?
The AF/AE flag on the SN74ALVC7804-40DLR becomes programmable after RESET: when PEN is held low, the first rising edge of LDCK latches D0–D7 as the almost-empty offset (X), and a second LDCK edge latches D0–D7 as the almost-full offset (Y). The flag asserts high when word count ≤ X or ≥ (512 − Y), providing customizable early-warning signaling without external logic.
Is the SN74ALVC7804-40DLR pin-compatible with other FIFO devices?
Yes, the SN74ALVC7804-40DLR is pin-compatible with the SN74ACT7804 in the same 56-pin DL (SSOP) package, allowing direct substitution in legacy 5-V ACT designs with appropriate level-shifting. It also shares footprint and pin functions with SN74ALVC7804-25DL, differing only in speed grade and AC specifications - no PCB changes required for migration within the ALVC family.
What are the power supply requirements for reliable operation of the SN74ALVC7804-40DLR?
The SN74ALVC7804-40DLR requires a tightly regulated 3.0 V to 3.6 V supply on VCC, with bypass capacitors (recommended: 0.1 µF ceramic near each VCC pin) to suppress switching noise. Absolute maximum VCC is 4.6 V; operation outside 3.0–3.6 V violates recommended conditions and may cause timing violations or increased ICC. GND connections must be low-impedance and distributed across all 8 ground pins (pins 12, 14, 26, 35, 44, 49, 52, 55) for signal integrity.
Can the SN74ALVC7804-40DLR be used in word-width expansion configurations?
Yes, the SN74ALVC7804-40DLR supports word-width expansion as documented in TI's SCAS432 application note: two devices can be cascaded to implement a 512 × 36-bit FIFO by connecting LDCK/UNCK in parallel and routing D0–D17/Q0–Q17 to adjacent channels, using FULL/EMPTY flags to coordinate flow control. No additional glue logic is needed beyond proper OE and RESET synchronization.
SN74ALVC7804-40DLR 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:
- 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
SN74ALVC7804-40DLR FAQ
1.How can I place an order for SN74ALVC7804-40DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC7804-40DLR 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 SN74ALVC7804-40DLR reliable?
The price and inventory of SN74ALVC7804-40DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC7804-40DLR is usually 5 days.
3.What payment methods are accepted for SN74ALVC7804-40DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC7804-40DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC7804-40DLR?
SN74ALVC7804-40DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC7804-40DLR 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 SN74ALVC7804-40DLR?
For technical support, including SN74ALVC7804-40DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC7804-40DLR requirements.
6.How does Aetrix verify that SN74ALVC7804-40DLR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC7804-40DLR 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 SN74ALVC7804-40DLR meets industry standards.
7.What is the process for return or replacement of SN74ALVC7804-40DLR?
All SN74ALVC7804-40DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC7804-40DLR, 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 SN74ALVC7804-40DLR part is unused and in its original packaging.
Return procedure for SN74ALVC7804-40DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALVC7804-40DLR Tags
-
7201LA15JGI
Renesas
-
7204L12JG
Renesas
-
72V82L15PAG8
Renesas
-
7205L15JGI
Renesas
-
7208L20JG
Renesas
-
72V2105L10PFG
Renesas
-
72V2111L15PFGI
Renesas
-
72V2113L6PFG
Renesas
-
72V36110L6PFG
Renesas
-
SN74ALVC7804-40DL
Texas Instruments
-
7202LA25JGI
Renesas
-
SN74V245-15PAG
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
