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Texas Instruments SN74ACT2236-20FN
- Part No.:
- SN74ACT2236-20FN
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- -
- Datasheet:
-
SN74ACT2236-20FN.pdf
- Description:
- IC FIFO 2KX9 BI-DIRECTIONAL
- Quantity:
- Payment:
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Inventory:381
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Product details
Overview
SN74ACT2236-20FN from Texas Instruments is a dual asynchronous 1024 × 9-bit FIFO memory IC with independent A/B data buses, programmable almost-full/almost-empty flags, and integrated bus transceivers. It delivers 25 ns access time at 50-pF load, supports up to 50 MHz clock rates, and operates across 0°C to 70°C for industrial data buffering applications including protocol bridging and real-time data stream alignment.
For engineers reviewing the SN74ACT2236-20FN datasheet, SN74ACT2236-20FN pinout, SN74ACT2236-20FN application, or SN74ACT2236-20FN equivalent, key selection criteria include dual-FIFO depth matching, PLCC-44 package compatibility, bidirectional bus-transceiver control logic, and programmable flag offset configuration via DAF/DBF inputs.
Technical Context
The SN74ACT2236-20FN integrates two independent 1024 × 9-bit FIFOs with separate load clocks (LDCKA/LDCKB), unload clocks (UNCKA/UNCKB), and reset controls (RSTA/RSTB). Each FIFO features empty, full, half-full, and programmable almost-full/almost-empty flags driven by dedicated status outputs.
Its bus-transceiver architecture uses DIR and OE inputs to configure real-time or stored data routing between A and B ports under SAB/SBA select-control logic - eliminating multiplexer glitches during mode transitions and enabling eight distinct bus-management functions per Figure 1 of SCAS149A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth | 2 × 1024 words × 9 bits - enables simultaneous buffering of two independent 9-bit parallel data streams without cross-talk. |
| Access Time | 25 ns at 50-pF load - ensures reliable timing margin for 40-MHz sustained data throughput in synchronous systems. |
| Max Clock Frequency | 50 MHz for LDCK/UNCK - supports high-speed streaming in video frame buffers, network packet alignment, and DSP interface staging. |
| Output Drive | ±8 mA (flags), +16/−8 mA (I/O ports) - provides direct TTL/CMOS bus interfacing without external drivers. |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded systems requiring stable FIFO behavior across ambient thermal ranges. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of typical power rail ripple in industrial backplanes. |
| Flag Programmability | User-defined almost-full/almost-empty offset (X/Y = 0–511) via DAF/DBF - allows precise buffer watermarking for custom flow-control protocols. |
Pinout & Package
SN74ACT2236-20FN is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC-FN) package with J-lead geometry, 0.050-inch lead pitch, and JEDEC MS-018 compliance. The package measures 1.158 inches × 0.958 inches (29.41 mm × 24.33 mm) with 0.219-inch body height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A8 | Bi-directional data port A | 9-bit parallel I/O for FIFO A read/write; high-impedance when OE high or DIR low. |
| B0–B8 | Bi-directional data port B | 9-bit parallel I/O for FIFO B read/write; high-impedance when OE high or DIR high. |
| LDCKA / LDCKB | Asynchronous write clock input | Low-to-high edge loads data from A0–A8 into FIFO A or B0–B8 into FIFO B; no effect when FIFO full. |
| UNCKA / UNCKB | Asynchronous read clock input | Low-to-high edge unloads data from FIFO A to B0–B8 or FIFO B to A0–A8; no effect when FIFO empty. |
| RSTA / RSTB | Asynchronous reset input | Active-low reset clears all FIFO contents and sets EMPTY/FULL/AF flags high; required at power-up. |
| AF/AEA / AF/AEB | Programmable status output | Open-drain flag indicating FIFO A/B contains ≤X or ≥(1024−X) words; X set via DAF/DBF during reset. |
| EMPTYA / EMPTYB | Status output | High when corresponding FIFO is non-empty; used for ready signaling in handshaking protocols. |
| FULLA / FULLB | Status output | High when corresponding FIFO is non-full; prevents overflow in continuous write scenarios. |
| HFA / HFB | Status output | High when ≥512 words stored; enables mid-buffer interrupt generation for balanced data consumption. |
| SAB / SBA | Select-control input | Configures real-time vs. stored data path: LL = real-time A↔B, HH = FIFO↔FIFO, LH/HL = mixed-mode routing. |
| DIR / OE | Transceiver enable | OE high disables both ports; OE low + DIR high enables B→A; OE low + DIR low enables A→B. |
| DAF / DBF | Flag offset programming input | High-to-low transition latches A0–A8/B0–B8 as new almost-full/almost-empty offset value X/Y for next reset cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent FIFOs | Enables concurrent buffering of asymmetric data streams (e.g., sensor input + control command) without arbitration overhead. |
| Programmable almost-full/almost-empty flags | Allows dynamic tuning of flow-control thresholds (X/Y = 0–511) to match system-specific latency and jitter tolerance. |
| Glitch-free select-control logic | Eliminates metastability during SAB/SBA transitions, ensuring deterministic bus routing in real-time deterministic systems. |
| Integrated bus transceivers | Reduces component count by combining FIFO storage and bidirectional bus switching in one PLCC-44 device. |
| Five status flag types per FIFO | Provides comprehensive visibility into buffer state (empty/full/half-full/AF/AE) for robust software- or hardware-based flow management. |
Applications
| Protocol Bridge Buffering | Video Frame Alignment |
|---|---|
|
Use Scenario: Bridging UART-to-PCIe or SPI-to-USB interfaces with mismatched data rates and burst patterns. IC Role / Device Role / Timing Role: SN74ACT2236-20FN acts as a dual-channel elastic buffer, absorbing rate differentials while maintaining data integrity across clock domains. Use Value: Prevents data loss during protocol translation by decoupling transmitter and receiver timing, leveraging independent LDCK/UNCK clocks and full flag handshaking. |
Use Scenario: Aligning progressive-scan video frames from multiple sensors before compression or display rendering. IC Role / Device Role / Timing Role: SN74ACT2236-20FN stores incoming pixel rows in FIFO A and outputs synchronized rows from FIFO B using HFA-triggered interrupts. Use Value: Enables precise inter-frame synchronization with 25 ns access time and half-full flag for predictable DMA trigger points. |
| Industrial PLC Data Staging | DSP Interface Buffering |
|
Use Scenario: Aggregating analog I/O scan data from distributed modules into a central controller with variable processing latency. IC Role / Device Role / Timing Role: SN74ACT2236-20FN buffers time-stamped sensor samples in FIFO A and feeds them to the CPU via FIFO B under RSTB-synchronized unload cycles. Use Value: Guarantees deterministic data delivery using programmable AF/AEB flags to initiate pre-emptive reads before buffer underflow. |
Use Scenario: Isolating high-speed ADC output from a fixed-point DSP core operating at lower clock frequency. IC Role / Device Role / Timing Role: SN74ACT2236-20FN serves as a 9-bit-wide data pipeline between ADC and DSP, using SAB/SBA to switch between live sampling and buffered playback modes. Use Value: Maintains uninterrupted ADC capture during DSP computation cycles via independent clock domains and glitch-free bus routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-asynchronous FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT2235-20FN | Single 2048 × 9 FIFO (vs. dual 1024 × 9); lacks SAB/SBA select logic and integrated transceivers. | Requires external bus switches for A↔B routing; suitable only when unified buffer depth suffices and routing complexity is acceptable. | Choose SN74ACT2235-20FN if system needs larger single-depth buffering and can implement discrete bus control. |
| IDT7205L15J | 512 × 9 dual FIFO with 15 ns access time; supports 3.3 V/5 V mixed-mode I/O; no integrated transceivers or programmable AF/AE flags. | Limited to lower-depth buffering; requires external level shifters and flag logic for 5-V systems; optimized for telecom line cards. | Choose IDT7205L15J only for space-constrained 3.3-V designs where 512-word depth and faster access outweigh feature gaps. |
Compared with SN74ACT2236-20FN, SN74ACT2235-20FN trades dual-FIFO flexibility and on-chip bus routing for greater single-depth capacity, while IDT7205L15J offers higher speed and voltage flexibility at the cost of flag programmability and transceiver integration - making SN74ACT2236-20FN uniquely suited for 5-V industrial systems requiring adaptive flow control and minimal external logic.
Availability
SN74ACT2236-20FN is available at Aetrix Electronics and suitable for industrial PLC data staging, video frame alignment, and protocol bridge buffering requiring stable component supply across extended production lifecycles.
Supply support for SN74ACT2236-20FN 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 SN74ACT2236-20FN belongs to TI's ACT-family advanced CMOS logic portfolio, designed specifically for high-speed, low-power asynchronous data buffering in commercial industrial systems requiring deterministic timing and robust bus management.
FAQ
What is the maximum data rate supported by the SN74ACT2236-20FN?
The SN74ACT2236-20FN supports up to 50 MHz clock frequency on both LDCKA/LDCKB and UNCKA/UNCKB inputs, enabling sustained data transfer rates of 450 Mbps (50 MHz × 9 bits) per FIFO channel. This is verified in the switching characteristics table of SCAS149A, where fmax = 50 MHz is specified for the -20 speed grade under recommended operating conditions.
How does the programmable almost-full/almost-empty flag work on the SN74ACT2236-20FN?
The SN74ACT2236-20FN implements programmable almost-full/almost-empty flags (AF/AEA and AF/AEB) by allowing users to define offset values X and Y (0–511) via DAF/DBF inputs during reset. When DAF transitions low, the binary value on A0–A8 is latched as X; AF/AEA then asserts high when FIFO A contains ≤X or ≥(1024−X) words - enabling custom watermarking for flow control.
Can the SN74ACT2236-20FN operate with mixed 3.3-V and 5-V interfaces?
No, the SN74ACT2236-20FN is rated for 4.5 V to 5.5 V supply only and has TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and CMOS output drive levels. It does not support 3.3-V logic levels directly; interfacing with 3.3-V systems requires level-shifting circuitry or voltage translators to avoid violating absolute maximum ratings.
What is the purpose of the SAB and SBA pins on the SN74ACT2236-20FN?
The SAB and SBA pins on the SN74ACT2236-20FN control the source of data routed between A and B buses. As defined in the SELECT-MODE CONTROL TABLE, their logic states determine whether real-time data (direct A↔B pass-through) or stored data (FIFO A↔FIFO B) is transferred - enabling eight distinct bus-management functions without external decoding logic.
Is the SN74ACT2236-20FN still in active production?
No, according to TI's packaging information addendum, SN74ACT2236-20FN is marked as OBSOLETE - meaning Texas Instruments has discontinued its production. However, Aetrix Electronics maintains legacy inventory and provides lifecycle availability coordination, including last-time buy planning and cross-reference support for ongoing industrial maintenance programs.
SN74ACT2236-20FN 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:
- -
SN74ACT2236-20FN FAQ
1.How can I place an order for SN74ACT2236-20FN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT2236-20FN 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 SN74ACT2236-20FN reliable?
The price and inventory of SN74ACT2236-20FN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT2236-20FN is usually 5 days.
3.What payment methods are accepted for SN74ACT2236-20FN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT2236-20FN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT2236-20FN?
SN74ACT2236-20FN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT2236-20FN 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 SN74ACT2236-20FN?
For technical support, including SN74ACT2236-20FN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT2236-20FN requirements.
6.How does Aetrix verify that SN74ACT2236-20FN is sourced from the original manufacturer or authorized distributors?
All SN74ACT2236-20FN 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 SN74ACT2236-20FN meets industry standards.
7.What is the process for return or replacement of SN74ACT2236-20FN?
All SN74ACT2236-20FN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT2236-20FN, 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 SN74ACT2236-20FN part is unused and in its original packaging.
Return procedure for SN74ACT2236-20FN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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