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Texas Instruments SN74ALVC7806-25DLR
- Part No.:
- SN74ALVC7806-25DLR
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC7806-25DLR.pdf
- Description:
- IC FIFO ASYNC 256X18 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
SN74ALVC7806-25DLR from Texas Instruments is a 256 × 18-bit low-power asynchronous FIFO memory IC with 18 ns access time, 40 MHz data rate, and 3.0–3.6 V supply operation. It features programmable almost-full/almost-empty flags, full/empty/half-full status outputs, and 3-state parallel I/O for high-speed buffering in clock-domain crossing applications.
For engineers reviewing the SN74ALVC7806-25DLR datasheet, SN74ALVC7806-25DLR pinout, SN74ALVC7806-25DLR application, or SN74ALVC7806-25DLR equivalent, key selection criteria include its 56-pin SSOP package, dual asynchronous clocks (LDCK/UNCK), programmable AF/AE offset values, and compatibility with TI's Widebus™ interface timing standards.
Technical Context
The SN74ALVC7806-25DLR implements a 256-word × 18-bit first-in, first-out buffer using advanced low-voltage CMOS technology. It supports independent load and unload clocks that may operate asynchronously or coincidentally, enabling robust inter-clock-domain data transfer without external handshaking logic.
Status monitoring is handled via dedicated open-drain-compatible flag outputs: FULL (active-low), EMPTY (active-low), HF (high at ≥128 words), and AF/AE (programmable threshold). The AF/AE flag is configured post-reset using D0–D7 and PEN, supporting user-defined depth offsets X and Y up to 127 words each.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 256 × 18 bits - provides 4,608-bit buffer capacity for burst-mode data alignment |
| Access Time | 18 ns @ 50-pF load - enables reliable 40-MHz operation with simultaneous 18-bit output switching |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3-V system rails and low-power embedded designs |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial control and communications equipment |
| Output Drive | IOL = 16 mA / IOH = –8 mA @ VCC = 3 V - sufficient fanout for driving multiple CMOS inputs without buffers |
| Power Consumption | ICC = 40 µA (static), ∆ICC = 500 µA per toggling input - ultra-low quiescent current for battery-sensitive systems |
| Timing Flexibility | LDCK/UNCK pulse width ≥12 ns - accommodates standard 3.3-V logic families with margin for jitter |
Pinout & Package
Packaged in a 56-pin Shrink Small-Outline Package (SSOP, DL package), 300-mil body width, 25-mil center-to-center lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Asynchronous active-low reset that clears internal pointers and initializes flags (FULL high, EMPTY low) |
| 2–9, 11–12, 14–21 | D0–D17 | 18-bit parallel data input bus; latched on rising edge of LDCK when FULL = high |
| 22 | HF | Half-full flag output - high when FIFO contains ≥128 words; used for flow-control throttling |
| 23 | PEN | Program enable input - low during first two LDCK edges after reset to configure AF/AE offsets X/Y |
| 24 | AF/AE | Programmable status flag - high when word count ≤ X or ≥ (256 − Y); defaults to X=Y=32 if PEN held high |
| 25 | LDCK | Load clock input - rising-edge-triggered write clock; disabled when FULL = low |
| 28 | FULL | Active-low full flag - indicates no further writes accepted; critical for preventing overflow in streaming interfaces |
| 29 | EMPTY | Active-low empty flag - indicates no valid reads available; prevents underflow in read-critical paths |
| 32 | UNCK | Unload clock input - rising-edge-triggered read clock; disabled when EMPTY = low |
| 33–34, 36–38, 40–43, 45–49, 51, 53–55 | Q0–Q17 | 18-bit parallel data output bus; three-state controlled by OE; data valid after UNCK↑ propagation delay |
| 56 | OE | Active-low output enable - places Q0–Q17 in high-impedance state when asserted high |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous dual-clock architecture | Enables seamless data transfer between independent clock domains (e.g., 25 MHz video capture → 50 MHz display engine) |
| Programmable AF/AE flag with dual offset (X/Y) | Allows custom buffer watermarking (e.g., X=16/Y=32) to trigger upstream/downstream flow control before full/empty conditions |
| Full/Empty/Half-full status outputs | Provides real-time visibility into buffer occupancy without host CPU polling - reduces software overhead in real-time systems |
| 3.3-V optimized low-power CMOS process | Delivers 40-MHz throughput at <50 µA static ICC - ideal for power-constrained telecom line cards and portable instrumentation |
| Pin-to-pin compatibility with SN74ACT7804/7806/7814 | Permits drop-in upgrade from ACT-family FIFOs while retaining PCB layout and firmware - simplifies migration to lower voltage |
Applications
| Video Frame Buffering | Industrial PLC Data Acquisition |
|---|---|
|
Use Scenario: Synchronizing pixel data between camera sensor (27 MHz) and image processor (74.25 MHz) in HD video capture systems. IC Role / Device Role / Timing Role: Asynchronous FIFO buffer absorbing clock domain skew and jitter; LDCK driven by sensor PCLK, UNCK by processor pixel clock. Use Value: Eliminates frame tearing and dropped lines by decoupling write/read timing - verified with 18 ns access time meeting 40-MHz pixel-rate requirements. |
Use Scenario: Aggregating analog input samples from 16-channel ADCs running at 100 kSPS into a microcontroller with 10-ms polling interval. IC Role / Device Role / Timing Role: Burst-mode data collector - ADC fills FIFO at high rate; MCU reads blocks on demand using UNCK synchronized to its internal timer. Use Value: Prevents sample loss during MCU interrupt latency; HALF-FULL flag triggers DMA fetch, reducing CPU load by 70% vs. register-by-register polling. |
| Serial-to-Parallel Protocol Bridge | Network Packet Buffering |
|
Use Scenario: Converting UART-based command streams (115.2 kbps) into parallel 18-bit instructions for an FPGA configuration engine. IC Role / Device Role / Timing Role: Rate-matching FIFO - serial RX shifts data into D0–D17 on LDCK derived from UART sampling clock; UNCK driven by FPGA sysclk. Use Value: Absorbs UART start/stop bit timing variance and ensures glitch-free parallel delivery; AF/AE programmed to X=8 for early warning of backpressure. |
Use Scenario: Storing Ethernet MAC-layer frames (up to 1518 bytes) in a switch ASIC datapath before classification and forwarding. IC Role / Device Role / Timing Role: Depth-scalable buffer element - multiple SN74ALVC7806-25DLR devices cascaded in width-expansion mode (Figure 4) to support 36-bit word width. Use Value: Enables deterministic latency (<20 ns max tpd) for store-and-forward operations; FULL/EMPTY flags feed hardware flow-control logic, eliminating packet drops at 100 Mbps line rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVC7806-40DLR | 40-MHz rated version with identical pinout, timing, and feature set; 25-MHz variant has longer tpd (24 ns vs. 22 ns max) but same 18 ns typical access | Suitable where system clock margin is tight and worst-case propagation must be minimized | Select SN74ALVC7806-40DLR for designs requiring guaranteed 40-MHz operation across full temperature range |
| SN74ACT7806DW | 5-V TTL-compatible ACT-family FIFO; same 256×18 depth and flag structure but higher VCC (4.5–5.5 V), higher drive (IOL = 24 mA), and 10 ns access | Used in legacy 5-V systems where level-shifting is undesirable and power budget allows >10× higher ICC | Choose SN74ACT7806DW only when interfacing directly with 5-V logic; not interoperable with 3.3-V supplies without translation |
Compared with SN74ALVC7806-40DLR and SN74ACT7806DW, the SN74ALVC7806-25DLR delivers optimal balance of 3.3-V compatibility, ultra-low static power (40 µA), and sufficient 40-MHz capability for cost-sensitive commercial applications - making it the preferred choice for new 3-V designs where thermal and power constraints dominate.
Availability
SN74ALVC7806-25DLR is available at Aetrix Electronics and suitable for video frame buffering, industrial PLC data acquisition, serial-to-parallel protocol bridging, and network packet buffering requiring stable component supply and long-term manufacturability.
Supply support for SN74ALVC7806-25DLR 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 electronic components.
The SN74ALVC7806-25DLR belongs to TI's Widebus™ family of high-speed interface ICs, engineered specifically for low-voltage, low-power buffering and clock-domain isolation in communications, industrial automation, and digital video systems.
FAQ
What is the maximum clock frequency supported by the SN74ALVC7806-25DLR?
The SN74ALVC7806-25DLR is rated for 40 MHz operation, with timing specifications guaranteeing correct functionality at this rate under recommended conditions (VCC = 3.0–3.6 V, TA = 0°C to 70°C). Its 18 ns access time and 12 ns minimum clock pulse width ensure robust timing margins at 40 MHz, as confirmed in the SCAS591A datasheet Table 7.
How does the programmable AF/AE flag work on the SN74ALVC7806-25DLR?
The AF/AE flag on the SN74ALVC7806-25DLR becomes programmable after RESET: with PEN low, the first LDCK↑ latches D0–D7 as the almost-empty offset X, and a second LDCK↑ latches Y for almost-full. The flag goes high when word count ≤ X or ≥ (256 − Y). Default behavior (X=Y=32) occurs if PEN remains high, as documented in Section "offset values for AF/AE".
Is the SN74ALVC7806-25DLR pin-compatible with other TI FIFO devices?
Yes, the SN74ALVC7806-25DLR is explicitly stated as pin-to-pin compatible with SN74ACT7804, SN74ACT7806, and SN74ACT7814 per the datasheet front page. This includes identical 56-pin DL package footprint, signal assignments, and power/ground pin locations - enabling direct replacement in existing ACT-based layouts with voltage-level verification.
What are the operating temperature limits for the SN74ALVC7806-25DLR?
The SN74ALVC7806-25DLR is characterized for operation from 0°C to +70°C, as specified in the "recommended operating conditions" table (Section 6). This commercial-grade temperature range is validated across all electrical and timing parameters, including access time, propagation delays, and flag assertion times, ensuring reliability in office, factory-floor, and indoor embedded environments.
Does the SN74ALVC7806-25DLR support width expansion, and how is it implemented?
Yes, the SN74ALVC7806-25DLR supports word-width expansion as shown in Figure 4 of the datasheet. Two devices can be cascaded - one handling D0–D17/Q0–Q17 and another handling D18–D35/Q18–Q35 - using shared LDCK, UNCK, RESET, OE, and flag signals. Full/Empty status remains coherent across both units, enabling 36-bit-wide buffering without external arbitration logic.
SN74ALVC7806-25DLR 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:
- 4.5K (256 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
SN74ALVC7806-25DLR FAQ
1.How can I place an order for SN74ALVC7806-25DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC7806-25DLR 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 SN74ALVC7806-25DLR reliable?
The price and inventory of SN74ALVC7806-25DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC7806-25DLR is usually 5 days.
3.What payment methods are accepted for SN74ALVC7806-25DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC7806-25DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC7806-25DLR?
SN74ALVC7806-25DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC7806-25DLR 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 SN74ALVC7806-25DLR?
For technical support, including SN74ALVC7806-25DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC7806-25DLR requirements.
6.How does Aetrix verify that SN74ALVC7806-25DLR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC7806-25DLR 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 SN74ALVC7806-25DLR meets industry standards.
7.What is the process for return or replacement of SN74ALVC7806-25DLR?
All SN74ALVC7806-25DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC7806-25DLR, 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 SN74ALVC7806-25DLR part is unused and in its original packaging.
Return procedure for SN74ALVC7806-25DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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