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Texas Instruments SN74ACT3632-30PCB
- Part No.:
- SN74ACT3632-30PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ACT3632-30PCB.pdf
- Description:
- IC FIFO SYNC 512X36X2 120HLQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ACT3632-30PCB from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 36-bit SRAM FIFOs, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 11 ns read access time, and programmable almost-full/empty flags synchronized per port clock. It enables high-speed data buffering between mismatched or isolated synchronous domains in telecom backplanes and industrial controller interconnects.
For engineers reviewing the SN74ACT3632-30PCB datasheet, SN74ACT3632-30PCB pinout, SN74ACT3632-30PCB application, or SN74ACT3632-30PCB equivalent, key selection criteria include dual-port flag synchronization timing, mailbox-bypass register behavior, FIFO reset sequencing, and PCB-package pin compatibility with SN74ACT3622/SN74ACT3642.
Technical Context
The SN74ACT3632-30PCB implements two independent clocked FIFOs (FIFO1 and FIFO2), each with 512 × 36-bit dual-port SRAM, where Port-A (A0–A35) and Port-B (B0–B35) operate under separate clocks (CLKA, CLKB) and control logic. All status flags-IRA/ORA/AFA/AEA for Port-A and IRB/ORB/AFB/AEB for Port-B-are two-stage synchronized to their respective port clocks to suppress metastability during asynchronous operation.
Each FIFO includes a dedicated 36-bit mailbox register (Mail1/Mail2) with handshake flags (MBF1/MBF2), enabling non-queued command transfer between ports. Flag offset registers (X1/Y1 for FIFO1; X2/Y2 for FIFO2) are programmable via Port-A writes or preset during reset using FS0/FS1 latching, supporting configurable almost-full/empty thresholds from 1 to 508 words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 512 × 36 × 2 independent FIFOs - supports full-duplex buffering of 36-bit parallel data streams in opposite directions. |
| Max Clock Frequency | 67 MHz - enables real-time data transfer at ≤14.9 ns clock period, suitable for high-throughput interface bridging. |
| Read Access Time | 11 ns - determines minimum latency from CLKA/CLKB edge to valid output data on A0–A35 or B0–B35. |
| Flag Synchronization | Two-stage flip-flop sync per port - reduces metastability risk when CLKA and CLKB operate asynchronously. |
| Operating Temperature | 0°C to 70°C - validated commercial-grade range for embedded industrial and telecom equipment. |
| Technology Node | 0.8-µm Advanced CMOS - delivers low-power operation while maintaining TTL-compatible input thresholds and output drive. |
Pinout & Package
SN74ACT3632-30PCB uses a 120-pin Thin Quad Flat Package (TQFP), designated "PCB" in TI documentation, with 0.4 mm lead pitch and exposed thermal pad. Pin numbering follows standard TQFP top-view layout with pins grouped by functional domain (Port-A, Port-B, clocks, controls, power/ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit parallel I/O path for FIFO2 read/FIFO1 write; high-impedance when CSA or W/RA high. |
| B0–B35 | Port-B bidirectional data bus | 36-bit parallel I/O path for FIFO1 read/FIFO2 write; high-impedance when CSB or W/RB low. |
| CLKA, CLKB | Independent port clocks | Continuous synchronous timing references; support asynchronous or coincident operation with no phase alignment requirement. |
| CSA, CSB | Port chip select inputs | Enable port activity only when low; disable outputs and ignore clock edges when high. |
| W/RA, W/RB | Port write/read direction controls | W/RA high = Port-A write; W/RB low = Port-B write - defines data flow direction per clock edge. |
| ENA, ENB | Port enable inputs | Gate clock-triggered transfers; must be high for any read/write action on respective port. |
| IRA, ORA, AFA, AEA | Port-A status flags | Synchronized to CLKA: IRA=write-ready, ORA=read-ready, AFA=almost-full, AEA=almost-empty. |
| IRB, ORB, AFB, AEB | Port-B status flags | Synchronized to CLKB: IRB=write-ready, ORB=read-ready, AFB=almost-full, AEB=almost-empty. |
| MBA, MBB | Mailbox select inputs | Select mail register (high) vs. FIFO output register (low) for data reads/writes on respective port. |
| RST1, RST2 | FIFO reset inputs | Asynchronous active-high resets requiring ≥4 CLKA+CLKB edges; latch FS0/FS1 for flag offset selection. |
| FS0, FS1 | Flag offset select inputs | Latched on RST1/RST2 rising edge to choose preset (64/16/8) or program-from-Port-A mode. |
| VCC, GND | Power supply terminals | Single 5 V supply; multiple distributed VCC/GND pairs ensure stable operation across high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables seamless bridging between systems with unrelated clocks (e.g., DSP ↔ microcontroller) without external synchronization logic. |
| Programmable almost-full/empty offsets | Four 9-bit offset registers (X1/Y1/X2/Y2) allow precise buffer-level management-critical for jitter-sensitive streaming protocols. |
| Integrated mailbox bypass registers | Two 36-bit registers (Mail1/Mail2) with MBF1/MBF2 handshaking eliminate FIFO queuing for control/command messages. |
| Metastability-hardened flag synchronization | Two-stage synchronizers on all 8 status flags reduce failure probability to <1e−9 per hour under worst-case async clock skew. |
| Pin-to-pin compatibility | Direct replacement for SN74ACT3622 (512×18×2) and SN74ACT3642 (1024×36×2) in same PCB footprint-enables scalable design reuse. |
Applications
| Telecom Backplane Interfacing | Industrial PLC Data Exchange |
|---|---|
Use Scenario: Bridging line-card ASICs with different clock domains in modular telecom chassis. IC Role / Device Role / Timing Role: Dual-clock FIFO buffering 36-bit parallel data between OC-48 framer and packet switch fabric. Use Value: Eliminates external clock-domain crossing logic while maintaining deterministic 11 ns read latency and flag-based flow control. |
Use Scenario: Real-time I/O data exchange between safety-critical motion controller and fieldbus master module. IC Role / Device Role / Timing Role: Bidirectional FIFO with mailbox registers handling both cyclic process data and asynchronous alarm commands. Use Value: Mailbox bypass ensures immediate delivery of emergency stop signals without FIFO queuing delay. |
| DSP-to-Microcontroller Interface | Test Equipment Pattern Buffering |
Use Scenario: Connecting TI C6000 DSP with ARM-based host processor in signal analyzer firmware architecture. IC Role / Device Role / Timing Role: Clock-domain isolator with programmable AF/AE thresholds matching DMA burst sizes. Use Value: Configurable offsets (1–508 words) align FIFO fill levels precisely with 64-word DSP DMA buffers. |
Use Scenario: High-speed digital pattern generator storing stimulus vectors before applying to DUT. IC Role / Device Role / Timing Role: Dual-port FIFO staging 36-bit wide test patterns at 67 MHz for glitch-free waveform playback. Use Value: 512-word depth per port provides sufficient margin for variable-length test sequences without overflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3622-30PCB | 512 × 18 × 2 configuration - half the data width per port, identical clocking and flag architecture. | Suitable for 18-bit bus interfaces (e.g., older DSPs); requires two devices for 36-bit width. | Choose when system bus width is 18 bits or cost-sensitive designs tolerate duplication. |
| SN74ACT3642-30PCB | 1024 × 36 × 2 configuration - double the depth, same pinout and control logic. | Required for longer burst buffering (e.g., video frame storage, large packet reassembly). | Choose when >512-word depth is needed and PCB layout accommodates same 120-pin footprint. |
Compared with SN74ACT3622-30PCB and SN74ACT3642-30PCB, the SN74ACT3632-30PCB offers optimal balance of 36-bit width and 512-word depth in the shared PCB package-making it the default choice for mid-range throughput applications without redesigning board layout.
Availability
SN74ACT3632-30PCB is available at Aetrix Electronics and suitable for telecom backplane interfacing, industrial PLC data exchange, DSP-to-microcontroller bridging, and test equipment pattern buffering requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT3632-30PCB 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 expertise in high-speed interface ICs and industrial-grade timing components.
The SN74ACT3632-30PCB belongs to TI's ACT-family clocked FIFO product line, designed specifically for deterministic, low-latency data buffering between asynchronous synchronous subsystems in telecom, industrial automation, and test instrumentation.
FAQ
What is the maximum supported clock frequency for SN74ACT3632-30PCB?
The SN74ACT3632-30PCB supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs. This specification is guaranteed across the full commercial temperature range (0°C to 70°C) and defines the upper limit for reliable synchronous data transfer through either port. Exceeding this frequency may result in timing violations, flag metastability, or data corruption in the FIFO arrays.
How does the mailbox bypass functionality work in SN74ACT3632-30PCB?
The SN74ACT3632-30PCB includes two 36-bit mailbox registers (Mail1 and Mail2) with dedicated flags MBF1 and MBF2. Writing to Mail1 occurs on a CLKA edge when MBA is high and Port-A write conditions are met; reading from Mail1 occurs on a CLKB edge when MBB is high. The mailbox operates independently of FIFO queuing, enabling immediate command transfer without latency from FIFO fill level.
Can SN74ACT3632-30PCB operate with CLKA and CLKB running at different frequencies?
Yes, the SN74ACT3632-30PCB is explicitly designed for asynchronous clock operation: CLKA and CLKB may run at different frequencies, phases, or duty cycles. All status flags (IRA/ORA/AFA/AEA and IRB/ORB/AFB/AEB) are two-stage synchronized to their respective port clocks, ensuring reliable handshaking without external resynchronization logic.
What is the purpose of the FS0 and FS1 pins on SN74ACT3632-30PCB?
FS0 and FS1 are flag-offset select inputs latched on the rising edge of RST1 or RST2. They determine how the almost-full (Y1/Y2) and almost-empty (X1/X2) offset registers are initialized: high/low combinations select preset values (64, 16, or 8), while FS0=FS1=low enables programming all four offsets from Port-A writes after simultaneous FIFO reset.
Is SN74ACT3632-30PCB pin-compatible with other devices in the same family?
Yes, SN74ACT3632-30PCB is pin-to-pin compatible with SN74ACT3622-30PCB (512×18×2) and SN74ACT3642-30PCB (1024×36×2) in the 120-pin PCB package. This allows direct substitution in existing layouts-depth or width scaling requires only firmware or logic changes, not PCB revision.
SN74ACT3632-30PCB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 120-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 36K (512 x 36 x 2)
- Function:
- Synchronous
- Data Rate:
- 33.4MHz
- Access Time:
- 15ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 400µA
- Bus Directional:
- Bi-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:
- 120-HLQFP (14x14)
SN74ACT3632-30PCB FAQ
1.How can I place an order for SN74ACT3632-30PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3632-30PCB 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 SN74ACT3632-30PCB reliable?
The price and inventory of SN74ACT3632-30PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3632-30PCB is usually 5 days.
3.What payment methods are accepted for SN74ACT3632-30PCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3632-30PCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT3632-30PCB?
SN74ACT3632-30PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3632-30PCB 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 SN74ACT3632-30PCB?
For technical support, including SN74ACT3632-30PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3632-30PCB requirements.
6.How does Aetrix verify that SN74ACT3632-30PCB is sourced from the original manufacturer or authorized distributors?
All SN74ACT3632-30PCB 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 SN74ACT3632-30PCB meets industry standards.
7.What is the process for return or replacement of SN74ACT3632-30PCB?
All SN74ACT3632-30PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3632-30PCB, 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 SN74ACT3632-30PCB part is unused and in its original packaging.
Return procedure for SN74ACT3632-30PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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