Texas Instruments SN74ALVC7806-40DLR

Overview

SN74ALVC7806-40DLR from Texas Instruments is a 256 × 18-bit low-power asynchronous FIFO memory IC operating at 3.0–3.6 V, delivering 40 MHz data rates and 18 ns access time with 50-pF load. It features independent load/unload clocks, full/empty/half-full flags, and programmable almost-full/almost-empty thresholds. Used in high-speed data buffering between mismatched clock domains in telecom interface logic.

For engineers reviewing the SN74ALVC7806-40DLR datasheet, SN74ALVC7806-40DLR pinout, SN74ALVC7806-40DLR application, or SN74ALVC7806-40DLR equivalent, key selection criteria include its 56-pin SSOP (DL) package, 18-bit parallel I/O width, asynchronous dual-clock operation, flag timing behavior under reset, and compatibility with 3.3-V logic systems requiring deterministic latency control.

Technical Context

The SN74ALVC7806-40DLR implements a 256-word × 18-bit static RAM core with separate write (LDCK) and read (UNCK) pointers, enabling true first-in-first-out operation across independent clock domains. Its status logic generates FULL, EMPTY, HF, and programmable AF/AE flags with defined assertion levels and timing delays relative to clock edges.

It supports asynchronous flag generation and configurable offset programming via D0–D7 during reset sequence when PEN is low. The device uses Advanced Low-Voltage CMOS (ALVC) process for 3.3-V operation, with 3-state outputs controlled by OE and guaranteed 0°C to 70°C industrial temperature range compliance.

Key Specifications

Pinout & Package

Packaged in 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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVC7806-25DLR, the SN74ALVC7806-40DLR delivers 60% higher throughput for real-time streaming, while versus SN74ACT7806DW it reduces supply current by >70% and adds programmable flow control-making it optimal for modern low-voltage, high-bandwidth embedded buffers.

Availability

SN74ALVC7806-40DLR is available at Aetrix Electronics and suitable for telecom infrastructure, digital audio subsystems, and industrial sensor aggregation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for SN74ALVC7806-40DLR 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 over 50 years of innovation in high-reliability interface and memory products.

The SN74ALVC7806-40DLR belongs to TI's Widebus™ family of advanced CMOS FIFOs, designed specifically for high-speed, low-power data buffering in mixed-clock-domain systems such as communications backplanes and multimedia SoC interconnects.

FAQ

What is the maximum supported clock frequency for SN74ALVC7806-40DLR?

The SN74ALVC7806-40DLR supports a maximum clock frequency of 40 MHz for both LDCK and UNCK inputs under recommended operating conditions (VCC = 3.0–3.6 V, TA = 0°C to 70°C). This rating is validated with 50-pF load and ensures reliable setup/hold timing margins per the datasheet's switching characteristics table.

Does SN74ALVC7806-40DLR require initialization before use?

Yes, SN74ALVC7806-40DLR must be reset on power-up using the active-low RESET pin to initialize internal pointers and flag states. Failure to assert RESET results in undefined FULL, EMPTY, HF, and AF/AE outputs, potentially causing data loss or system lockup during first write/read cycle.

How is the AF/AE flag programmed on SN74ALVC7806-40DLR?

The AF/AE flag offset values (X for almost-empty, Y for almost-full) are programmed on SN74ALVC7806-40DLR by holding PEN low after RESET, then applying two consecutive LDCK rising edges: the first latches D0–D7 as X, the second as Y. Programming occurs before any data write and disables LDCK until complete.

Is SN74ALVC7806-40DLR pin-compatible with older ACT-family FIFOs?

Yes, SN74ALVC7806-40DLR is pin-to-pin compatible with SN74ACT7806, SN74ACT7804, and SN74ACT7814 per the datasheet. This allows direct substitution in existing layouts, though voltage translation may be needed when interfacing with 5-V ACT devices due to its 3.3-V-only operation.

What package type does SN74ALVC7806-40DLR use, and what are its key mechanical specs?

SN74ALVC7806-40DLR uses the DL package: a 56-pin Shrink Small-Outline Package with 300-mil body width, 25-mil lead pitch, and RoHS-compliant NIPDAU finish. Its MSL Level-1 rating permits unlimited floor life, and it is qualified for reflow up to 260°C peak temperature.