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Texas Instruments SN74ALS2233AN
- Part No.:
- SN74ALS2233AN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- -
- Datasheet:
-
SN74ALS2233AN.pdf
- Description:
- IC FIFO SYNC 64X9 24NS
- Quantity:
- Payment:
- Shipping:
Inventory:749
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Product details
Overview
SN74ALS2233AN from Texas Instruments is a 64-word × 9-bit asynchronous FIFO memory IC with independent load/unload clocks, 40 MHz max clock rate, 20 ns typical fall-through time, and 3-state outputs - used as a bit-parallel data buffer between mismatched bus domains in industrial control and communications interfaces.
For engineers reviewing the SN74ALS2233AN datasheet, SN74ALS2233AN pinout, SN74ALS2233AN application, or SN74ALS2233AN equivalent, key selection criteria include full/empty flag timing, LDCK/UNCK setup/hold requirements, AF/AE threshold behavior, and 5-V TTL-compatible I/O drive capability under 0°C to 70°C operation.
Technical Context
This FIFO implements dual-clock architecture with separate LDCK (write) and UNCK (read) inputs, enabling true asynchronous data transfer between independent clock domains. Internal 64-word depth counter tracks occupancy, driving FULL, EMPTY, AF/AE (8/56-word thresholds), and HF (32-word threshold) status flags.
Reset (RST) initializes stack pointers and forces EMPTY low/FULL high without affecting output states; OE controls Q0–Q8 3-state drivers independently of flag logic. Data is noninverting, with write occurring on LDCK↑ and read on UNCK↑, and no cascading support in word-depth direction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64 words × 9 bits - supports parallel 9-bit data transfers with full buffering capacity for burst-to-stream conversion. |
| Max Clock Frequency | 40 MHz - enables high-throughput bridging between fast peripherals and slower processors or legacy buses. |
| Fall-Through Time | 20 ns typical - defines minimum latency from write to first readable output, critical for real-time pipeline synchronization. |
| Supply Voltage | 4.5 V to 5.5 V - operates within standard 5-V TTL rail with margin for noise immunity and voltage droop. |
| Operating Temperature | 0°C to 70°C - rated for commercial/industrial ambient environments without derating. |
| Output Drive | 24 mA sink / −2.6 mA source on Q outputs - ensures robust fanout into multiple TTL loads without external buffers. |
| Status Flag Logic | FULL active-low, EMPTY active-low, AF/AE high when ≤8 or ≥56 words - enables precise flow control with minimal external logic. |
Pinout & Package
SN74ALS2233AN is housed in a 28-pin plastic DIP (N package), 0.6-inch width, with through-hole mounting and standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Asynchronous reset input | Active-low signal that clears internal pointer registers and forces EMPTY=low/FULL=high at power-up or error recovery. |
| LDCK | Load clock input | Low-to-high transition writes D0–D8 into FIFO; ignored when FULL is asserted. |
| UNCK | Unload clock input | Low-to-high transition reads Q0–Q8 from FIFO; ignored when EMPTY is asserted. |
| OE | Output enable input | Active-low control for Q0–Q8 3-state drivers; does not affect FULL/EMPTY/AF/AE/HF flag outputs. |
| D0–D8 | Data inputs | 9-bit parallel input bus accepting TTL-level signals; latched on LDCK↑. |
| Q0–Q8 | Data outputs | 9-bit noninverting parallel outputs placed in high-impedance state when OE is low. |
| FULL | Status flag output | Active-low open-collector output indicating FIFO contains 64 words; used to stall write operations. |
| EMPTY | Status flag output | Active-low open-collector output indicating zero words stored; used to disable read operations. |
| AF/AE | Status flag output | Active-high output signaling ≤8 words (almost empty) or ≥56 words (almost full); enables early flow control. |
| HF | Status flag output | Active-high output asserted when ≥32 words are stored; useful for balanced read/write scheduling. |
| VCC, GND | Power supply terminals | Single 5-V supply with dedicated ground pin; decoupling required near pins 14 (VCC) and 19 (GND). |
Key Features
| Feature | Design Value |
|---|---|
| Independent asynchronous clocks | Separate LDCK and UNCK inputs allow seamless interfacing between unrelated clock domains without synchronization logic. |
| Programmable flow-control flags | FULL, EMPTY, AF/AE, and HF outputs provide four discrete occupancy levels for adaptive throttling and buffer management. |
| Fast fall-through latency | 20 ns typical delay from LDCK↑ to valid Q-output enables tight timing budgets in high-speed data pipelines. |
| 5-V TTL-compatible I/O | Meets ALS logic thresholds and drive strength specs, ensuring direct compatibility with legacy 74-series and microcontroller GPIOs. |
| Hardware reset with flag initialization | RST input synchronously resets internal counters and sets predictable flag states (EMPTY=low, FULL=high) without requiring software intervention. |
Applications
| Industrial PLC Communication Bridge | Legacy Bus-to-Microcontroller Interface |
|---|---|
Use Scenario: Isolating Modbus RTU master and slave devices operating at different baud rates via parallel FIFO handshake. IC Role / Device Role / Timing Role: Asynchronous data buffer managing byte-aligned transfers between UART peripherals and 8-bit microcontroller data buses. Use Value: Eliminates software-based polling or DMA overhead by providing hardware-managed occupancy signaling (FULL/EMPTY/AF/AE) for deterministic flow control. |
Use Scenario: Connecting an ISA-bus peripheral to a modern ARM-based controller using level-shifted parallel interface. IC Role / Device Role / Timing Role: Bit-parallel FIFO absorbing burst writes from ISA and releasing data at CPU-controlled read rate. Use Value: Resolves timing mismatch between 8-MHz ISA cycles and variable-latency memory-mapped reads, preventing data loss during bus arbitration. |
| Test Equipment Data Capture Buffer | Digital Signal Acquisition Pipeline |
Use Scenario: Capturing high-speed digital waveform samples from logic analyzer front-end before host PC transfer. IC Role / Device Role / Timing Role: First-stage buffering stage accepting 40 MHz sampled data and feeding it to slower USB or PCIe interface logic. Use Value: Provides 576-bit temporary storage with precise AF/AE flags to trigger DMA requests before overflow, ensuring zero-sample loss. |
Use Scenario: Interfacing a 9-bit ADC array to an FPGA processing engine with independent clock domains. IC Role / Device Role / Timing Role: Synchronizing ADC output stream (driven by sampling clock) to FPGA system clock via dual-edge-triggered FIFO. Use Value: Enables glitch-free domain crossing with sub-20 ns latency and built-in half-full (HF) flag for optimal FIFO fill-level management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT2233N | Higher speed (50 MHz max), ACT logic family, 4.5–5.5 V supply, same pinout and function. | Better noise immunity and faster timing margins; requires tighter layout due to higher edge rates. | Select when upgrading legacy designs needing improved setup/hold margins or lower propagation delay. |
| CD74HC40105E | CMOS technology, 2–6 V supply, 16-word × 4-bit organization, different pinout and flag set (no HF/AF-AE). | Lower power consumption but reduced depth and width; lacks half-full and almost-full/empty flags. | Select for low-power, space-constrained systems where 64×9 depth and advanced flag granularity are not required. |
Compared with SN74ALS2233AN, SN74ACT2233N offers higher clock tolerance and identical functionality in a drop-in compatible package, while CD74HC40105E trades depth, width, and flag sophistication for CMOS efficiency and wider voltage range - making each suitable for distinct trade-off priorities in timing-critical or power-sensitive designs.
Availability
SN74ALS2233AN is available at Aetrix Electronics and suitable for industrial PLC communication bridges, legacy bus-to-microcontroller interfaces, test equipment data capture buffers, and digital signal acquisition pipelines requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74ALS2233AN 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS2233AN belongs to TI's 74ALS logic family, designed specifically for high-speed, low-power asynchronous data buffering in commercial-grade systems requiring robust TTL interoperability and deterministic timing behavior.
FAQ
What is the maximum clock frequency supported by the SN74ALS2233AN?
The SN74ALS2233AN supports a maximum clock frequency of 40 MHz on both LDCK and UNCK inputs under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C, CL = 50 pF). This rating is confirmed in the switching characteristics table of the SCAS249 datasheet and applies to guaranteed functional operation-not just AC characterization limits.
Does the SN74ALS2233AN support cascading for increased word depth?
No, the SN74ALS2233AN does not support cascading in the word-depth direction. The datasheet explicitly states "cascading is easily accomplished in the word-width direction, but is not possible in the word-depth direction." Depth expansion beyond 64 words requires external control logic or alternate FIFO architectures.
How does the AF/AE flag behave on the SN74ALS2233AN?
The AF/AE flag on the SN74ALS2233AN is active-high and asserts when the FIFO contains eight or fewer words (almost empty) or 56 or more words (almost full). It deasserts when word count is between nine and 55 inclusive. This dual-threshold behavior is hardwired and cannot be reconfigured, enabling early flow control without external comparators.
What happens to the Q outputs during reset on the SN74ALS2233AN?
During RST assertion on the SN74ALS2233AN, internal stack pointers are reset and EMPTY goes low while FULL goes high-but the Q0–Q8 outputs retain their last valid logic states and are not forced to any defined level. Output states only change on subsequent UNCK↑ transitions or when OE is toggled.
Is the SN74ALS2233AN pin-compatible with newer TI FIFOs like the SN74ACT2233N?
Yes, the SN74ALS2233AN is pin-compatible with the SN74ACT2233N: both share identical 28-pin DIP packaging, identical pin functions (including RST, LDCK, UNCK, OE, D0–D8, Q0–Q8, FULL, EMPTY, AF/AE, HF, VCC, GND), and identical logic behavior. The ACT version upgrades speed and noise immunity while maintaining mechanical and electrical interchangeability.
SN74ALS2233AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- -
- Function:
- -
- Data Rate:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Bus Directional:
- -
- Expansion Type:
- -
- Programmable Flags Support:
- -
- Retransmit Capability:
- -
- FWFT Support:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS2233AN FAQ
1.How can I place an order for SN74ALS2233AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS2233AN 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 SN74ALS2233AN reliable?
The price and inventory of SN74ALS2233AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS2233AN is usually 5 days.
3.What payment methods are accepted for SN74ALS2233AN?
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4.How is shipping managed for SN74ALS2233AN?
SN74ALS2233AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS2233AN 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 SN74ALS2233AN?
For technical support, including SN74ALS2233AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS2233AN requirements.
6.How does Aetrix verify that SN74ALS2233AN is sourced from the original manufacturer or authorized distributors?
All SN74ALS2233AN 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 SN74ALS2233AN meets industry standards.
7.What is the process for return or replacement of SN74ALS2233AN?
All SN74ALS2233AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS2233AN, 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 SN74ALS2233AN part is unused and in its original packaging.
Return procedure for SN74ALS2233AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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