My Inquiry
My Account
Texas Instruments SN74ACT2235-30PAG
- Part No.:
- SN74ACT2235-30PAG
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 64-TQFP
- Datasheet:
-
SN74ACT2235-30PAG.pdf
- Description:
- IC FIFO ASYNC 1KX9X2 25NS 64QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,161
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ACT2235-30PAG from Texas Instruments is a dual asynchronous bidirectional FIFO memory IC with two independent 1024 × 9-bit buffers, 25 ns access time, 50 MHz data rate capability, and programmable almost-full/almost-empty flags - used in high-speed bus bridging and real-time data buffering between mismatched clock domains.
For engineers reviewing the SN74ACT2235-30PAG datasheet, SN74ACT2235-30PAG pinout, SN74ACT2235-30PAG application, or SN74ACT2235-30PAG equivalent, this page delivers verified timing parameters, flag programming logic, transceiver control behavior, and PAG-package terminal mapping for immediate schematic integration and FIFO depth validation.
Technical Context
The SN74ACT2235-30PAG implements two independent 1024-word × 9-bit FIFOs with fully asynchronous read/write clocks (LDCKA/UNCKA and LDCKB/UNCKB), enabling concurrent data ingestion and egress at up to 50 MHz. Each FIFO supports empty/full/half-full status flags and user-programmable almost-full/almost-empty thresholds via DAF/DBF inputs.
Its integrated bus transceivers (A0–A8 and B0–B8) are controlled by GAB/GBA enables and SAB/SBA select lines, allowing eight distinct bus-management modes - including real-time pass-through, FIFO-to-bus, bus-to-FIFO, and bidirectional stored-data transfer - without external decoding logic or glitch risk during mode transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Architecture | Dual independent 1024 × 9-bit asynchronous FIFOs - supports simultaneous A→B and B→A data flow with separate clock domains. |
| Access Time | 25 ns at 50-pF load - ensures sub-40-ns latency for high-speed interface synchronization. |
| Data Rate | Up to 50 MHz - matches standard TTL/CMOS bus timing for legacy and mixed-signal systems. |
| Flag Programmability | AF/AEA and AF/AEB flags configurable via DAF/DBF with user-defined offset (0–511) or default 256 - enables precise buffer-level monitoring. |
| Output Drive | ±8 mA high-level / 16 mA low-level drive on I/O ports - directly interfaces 5-V TTL/CMOS buses without line drivers. |
| Operating Temperature | 0°C to +70°C - qualified for commercial and industrial embedded control applications. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply ripple. |
Pinout & Package
SN74ACT2235-30PAG uses a 64-pin thin quad flat package (PAG) per JEDEC MS-026, with 0.5-mm lead pitch, 10.2 mm × 10.2 mm body, and exposed thermal pad. Pin numbering follows top-view orientation with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A8 | I/O port A | 9-bit bidirectional data bus for FIFO A - connects to host processor or peripheral A-side interface. |
| B0–B8 | I/O port B | 9-bit bidirectional data bus for FIFO B - connects to secondary controller or serial interface side. |
| LDCKA / LDCKB | Input clock | Low-to-high edge writes data from A0–A8/B0–B8 into respective FIFO - asynchronous to UNCK signals. |
| UNCKA / UNCKB | Input clock | Low-to-high edge reads data from FIFO A/B onto opposite bus - independent of write clock timing. |
| RSTA / RSTB | Input | Active-low reset initializes both FIFOs, sets EMPTYA/EMPTYB high, FULLA/FULLB high, and clears all flags. |
| SAB / SBA | Input | Select-control inputs determining real-time vs. stored data path - enable eight bus-management functions per Figure 2. |
| GAB / GBA | Input | Output-enable controls for B- and A-port transceivers - set high-impedance state when inactive. |
| AF/AEA / AF/AEB | Output | Programmable almost-full/almost-empty flags for FIFO A/B - indicate buffer occupancy within ±X words of full/empty. |
| HFA / HFB | Output | Half-full status outputs - high when ≥512 words stored - useful for flow control throttling. |
| FULLA / FULLB | Output | Full condition indicators - low when FIFO is completely filled - prevent overflow during write operations. |
| EMPTYA / EMPTYB | Output | Empty condition indicators - low when FIFO contains no valid data - prevent underflow during read operations. |
| DAF / DBF | Input | Define-flag inputs - falling edge latches A0–A8/B0–B8 as new almost-full/almost-empty offset value X/Y. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent FIFO architecture | Enables true bidirectional, clock-domain-isolated buffering - eliminates need for two discrete FIFO ICs and external arbitration logic. |
| Programmable almost-full/almost-empty flags | Allows dynamic adjustment of buffer warning thresholds via DAF/DBF - supports adaptive flow control without firmware changes. |
| Integrated bus transceivers with glitch-free select control | SAB/SBA inputs eliminate multiplexer transition glitches - ensures deterministic bus handoff between real-time and stored data paths. |
| High-output-drive capability (16 mA sink) | Directly drives 5-V TTL loads - removes requirement for external bus buffers in most industrial backplane and control bus designs. |
| Asynchronous operation with separate clocks | LDCKA/UNCKA and LDCKB/UNCKB operate independently - supports mismatched source/sink clock frequencies up to 50 MHz. |
Applications
| Industrial Data Acquisition | Legacy Bus Bridging |
|---|---|
Use Scenario: Capturing sensor data from multiple analog input modules operating at different sampling rates into a centralized PLC controller. IC Role / Device Role / Timing Role: SN74ACT2235-30PAG acts as an asynchronous data aggregator - absorbing variable-rate streams into FIFO A and presenting synchronized bursts to the PLC via FIFO B. Use Value: Eliminates dropped samples due to timing mismatches; 1024-word depth accommodates bursty acquisition windows without CPU polling overhead. |
Use Scenario: Interfacing a modern microcontroller (50 MHz) with a legacy ISA bus (8 MHz) while preserving signal integrity and timing margins. IC Role / Device Role / Timing Role: SN74ACT2235-30PAG serves as a dual-clock domain bridge - decoupling write cycles from the fast CPU and read cycles from the slow ISA bus controller. Use Value: Enables seamless protocol translation without custom ASIC or FPGA; 25 ns access time meets ISA setup/hold requirements even at maximum speed. |
| Telecom Line Card Buffering | Test Equipment Pattern Memory |
Use Scenario: Storing incoming T1/E1 frame payloads in telecom line cards before CRC verification and forwarding to switching fabric. IC Role / Device Role / Timing Role: SN74ACT2235-30PAG provides dedicated FIFO A for ingress framing and FIFO B for egress retransmission - each with independent clocking and flag monitoring. Use Value: Half-full (HFA/HFB) and programmable almost-empty flags allow precise DMA trigger points - minimizing jitter and maximizing throughput in real-time packet processing. |
Use Scenario: Holding stimulus/response patterns in automated test equipment (ATE) where pattern generator and capture logic run on separate clocks. IC Role / Device Role / Timing Role: SN74ACT2235-30PAG functions as a dual-directional pattern buffer - loading test vectors into FIFO A and capturing results into FIFO B with independent timing control. Use Value: 9-bit width matches common ATE parallel bus widths; 1024-depth supports medium-complexity test sequences without external SRAM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7205L15TPG | Single 2048 × 9 FIFO, 15 ns access, 3.3 V only, no integrated transceivers | Requires external level shifters and bus switches for 5-V systems; lacks SAB/SBA multiplexing logic | Choose when higher depth and lower latency are critical, and system operates at 3.3 V with discrete bus control. |
| SN74ACT2236-30PAG | Same pinout and function but with 512 × 9 × 2 configuration and 20 ns access time | Halved memory depth; faster access but reduced buffering capacity for bursty traffic | Choose when design prioritizes speed over buffer margin and 512-word depth suffices for worst-case latency tolerance. |
Compared with IDT7205L15TPG and SN74ACT2236-30PAG, the SN74ACT2235-30PAG uniquely combines dual 1024×9 depth, 5-V compatibility, integrated transceivers, and programmable flags in a single PAG package - making it optimal for cost-sensitive, space-constrained 5-V bus bridging where buffer headroom and glitch-free mode switching are essential.
Availability
SN74ACT2235-30PAG is available at Aetrix Electronics and suitable for industrial data acquisition, legacy bus bridging, telecom line card buffering, and test equipment pattern memory requiring stable component supply across extended production lifecycles.
Supply support for SN74ACT2235-30PAG 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 industrial-grade reliability validation.
The SN74ACT2235-30PAG belongs to TI's ACT-family advanced CMOS logic portfolio, designed specifically for high-speed, low-power asynchronous data buffering in mixed-clock-domain systems requiring robust flag signaling and direct bus interfacing.
FAQ
What is the maximum clock frequency supported by SN74ACT2235-30PAG for LDCK and UNCK inputs?
The SN74ACT2235-30PAG supports up to 50 MHz for both LDCKA/LDCKB and UNCKA/UNCKB inputs under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating is confirmed in the timing requirements table on page 9 of the SCAS148F datasheet, where fclk for LDCK/UNCK is specified as 50 MHz for the -30 speed grade.
How does the programmable almost-full/almost-empty flag work on SN74ACT2235-30PAG?
The SN74ACT2235-30PAG allows user-defined almost-full/almost-empty thresholds via DAF/DBF inputs. A falling edge on DAF latches A0–A8 as offset X (0–511); similarly, DBF latches B0–B8 as Y. After reset, AF/AEA goes high when FIFO A contains ≤X or ≥(1024−X) words. Default X = Y = 256 if DAF/DBF remain high during reset.
Does SN74ACT2235-30PAG require external pull-up resistors on its flag outputs?
No, SN74ACT2235-30PAG flag outputs (AF/AEA, AF/AEB, FULLA, FULLB, EMPTYA, EMPTYB, HFA, HFB) are active-high push-pull drivers with ±8 mA output capability. They do not require external pull-ups and are designed to directly interface with TTL/CMOS inputs under 4.5–5.5 V supply conditions.
Can SN74ACT2235-30PAG operate with different supply voltages on its A and B sides?
No, SN74ACT2235-30PAG has a single VCC pin supplying both FIFO cores and transceivers. All I/Os (A0–A8, B0–B8) and control inputs share the same 4.5–5.5 V rail. It does not support split-rail or dual-supply operation - voltage translation must be handled externally if interfacing with non-5-V logic.
What is the purpose of the SAB and SBA pins on SN74ACT2235-30PAG?
SAB and SBA are select-control inputs that determine whether real-time or stored data passes through the SN74ACT2235-30PAG transceivers. As defined in Figure 2 and Table on page 8, their logic levels configure eight bus-management functions - such as FIFO B→A with real-time A→B, or dual FIFO mode - eliminating external multiplexer logic and associated timing glitches.
SN74ACT2235-30PAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 64-TQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 18K (1K x 9 x 2)
- Function:
- Asynchronous
- Data Rate:
- 33MHz
- Access Time:
- 25ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 400µA
- Bus Directional:
- Bi-Directional
- Expansion Type:
- -
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
SN74ACT2235-30PAG FAQ
1.How can I place an order for SN74ACT2235-30PAG through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT2235-30PAG 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 SN74ACT2235-30PAG reliable?
The price and inventory of SN74ACT2235-30PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT2235-30PAG is usually 5 days.
3.What payment methods are accepted for SN74ACT2235-30PAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT2235-30PAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT2235-30PAG?
SN74ACT2235-30PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT2235-30PAG 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 SN74ACT2235-30PAG?
For technical support, including SN74ACT2235-30PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT2235-30PAG requirements.
6.How does Aetrix verify that SN74ACT2235-30PAG is sourced from the original manufacturer or authorized distributors?
All SN74ACT2235-30PAG 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 SN74ACT2235-30PAG meets industry standards.
7.What is the process for return or replacement of SN74ACT2235-30PAG?
All SN74ACT2235-30PAG units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT2235-30PAG, 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 SN74ACT2235-30PAG part is unused and in its original packaging.
Return procedure for SN74ACT2235-30PAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT2235-30PAG 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…
