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Texas Instruments SN74ACT3632-30PQ
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- Part No.:
- SN74ACT3632-30PQ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
SN74ACT3632-30PQ.pdf
- Description:
- IC FIFO SYNC 512X36X2 132BQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ACT3632-30PQ from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 36 SRAM FIFOs, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 11 ns access time, and programmable almost-full/empty flags synchronized to respective port clocks. It enables high-speed data buffering between microprocessor buses operating at different clock domains.
For engineers reviewing the SN74ACT3632-30PQ datasheet, SN74ACT3632-30PQ pinout, SN74ACT3632-30PQ application, or SN74ACT3632-30PQ equivalent, key selection considerations include dual-port flag synchronization, mailbox-bypass register support, 132-pin PQ package layout, and compatibility with SN74ACT3622/SN74ACT3642 for drop-in replacement in legacy designs.
Technical Context
The SN74ACT3632-30PQ implements two fully independent clocked FIFOs (FIFO1 and FIFO2), each with 512 × 36-bit depth and separate read/write pointers, input-ready (IRA/IRB) and output-ready (ORA/ORB) flags synchronized to CLKA and CLKB respectively. Each FIFO supports programmable almost-empty (AEA/AEB) and almost-full (AFA/AFB) flags with offset registers loaded via reset latching or port-A programming.
It integrates dual 36-bit mailbox registers (Mail1/Mail2) with dedicated flags (MBF1/MBF2), enabling non-queued command transfer between ports. Flag synchronization uses two-stage flip-flop staging to mitigate metastability when CLKA and CLKB operate asynchronously, and reset logic requires four clock transitions per port for full initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth | 512 × 36 × 2 words - two independent FIFO buffers, each holding 512 words of 36-bit data for bidirectional flow control. |
| Max Clock Frequency | 67 MHz - supports high-throughput interconnect between fast microprocessors or DSPs without external timing constraints. |
| Access Time | 11 ns - guarantees deterministic read latency from FIFO output register after OR flag assertion. |
| Flag Synchronization | Two-stage clock-domain crossing - IRA/AFA/AEA/ORA synchronized to CLKA; IRB/AFB/AEB/ORB to CLKB for reliable metastability suppression. |
| Operating Temperature | 0°C to 70°C - commercial-grade thermal range suitable for embedded computing and industrial control systems. |
| Technology Node | 0.8-µm Advanced CMOS - delivers low-power operation while maintaining TTL-compatible voltage thresholds and drive strength. |
| Programmable Offsets | Four 9-bit registers (X1/X2/Y1/Y2) - enable dynamic tuning of almost-empty/almost-full thresholds from 1 to 508 words per FIFO. |
Pinout & Package
SN74ACT3632-30PQ is housed in a 132-pin Plastic Quad Flat (PQ) package with 0.65 mm lead pitch, compliant with JEDEC MS-026. The package includes 72 I/O pins (A0–A35, B0–B35), dual clock inputs (CLKA/CLKB), independent chip selects (CSA/CSB), write/read controls (W/RA/W/RB), enable signals (ENA/ENB), mailbox selectors (MBA/MBB), reset inputs (RST1/RST2), flag-offset selects (FS0/FS1), and 12 power/ground terminals (VCC/GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit parallel interface for FIFO1 write/FIFO2 read; high-impedance when CSA high or W/RA high. |
| B0–B35 | Port-B bidirectional data bus | 36-bit parallel interface for FIFO2 write/FIFO1 read; high-impedance when CSB high or W/RB low. |
| CLKA / CLKB | Asynchronous port clocks | Continuous clocks driving all port-A/B operations; support independent frequency, phase, and domain alignment. |
| IRA / IRB | Input-ready status flags | Synchronized to CLKA/CLKB; low indicates FIFO1/FIFO2 full and disables further writes until space becomes available. |
| ORA / ORB | Output-ready status flags | Synchronized to CLKA/CLKB; high indicates valid data present in FIFO2/FIFO1 output register for immediate read. |
| MBA / MBB | Mailbox select controls | High selects Mail2/Mail1 register instead of FIFO output register during port-A/B read/write operations. |
| RST1 / RST2 | Independent FIFO resets | Asynchronous active-high resets requiring four CLKA+CLKB transitions; initialize pointers, flags, and offset registers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables seamless bridging between mismatched microprocessor buses (e.g., 50 MHz CPU ↔ 67 MHz DSP) without glue logic. |
| Mailbox-bypass registers | Two 36-bit registers (Mail1/Mail2) allow priority command injection outside FIFO queuing, reducing latency for control messages. |
| Programmable flag offsets | Configurable almost-full/almost-empty thresholds (1–508 words) via port-A writes or reset-time FS0/FS1 latching for adaptive buffer management. |
| Metastability-hardened flag sync | Two-stage synchronizers on all status flags ensure robust operation under worst-case asynchronous clock skew conditions. |
| Pin-to-pin compatibility | Direct replacement for SN74ACT3622 and SN74ACT3642 in existing PCB layouts, simplifying design migration and obsolescence mitigation. |
Applications
| Microprocessor Bus Bridging | DSP-to-Host Interface |
|---|---|
|
Use Scenario: Interfacing a 67 MHz DSP with a 50 MHz microcontroller bus where data rates and clock domains differ. IC Role / Device Role / Timing Role: Bidirectional FIFO buffer managing data flow directionality and rate adaptation between ports A and B. Use Value: Eliminates need for external handshaking logic by providing synchronized ready flags (ORA/IRB) and mailbox registers for control packet injection. |
Use Scenario: Real-time audio streaming from TI C6x DSP to ARM host processor with jitter-sensitive timing requirements. IC Role / Device Role / Timing Role: Clock-domain crossing FIFO ensuring glitch-free data transfer while preserving sample order and timing integrity. Use Value: 11 ns access time and two-stage flag synchronization prevent metastability-induced data loss during high-frequency transfers. |
| Industrial PLC Backplane | Legacy System Upgrade Path |
|
Use Scenario: Buffering sensor data from multiple fieldbus modules into a central controller across electrically noisy environments. IC Role / Device Role / Timing Role: Dual FIFO with programmable almost-empty flags (AEA/AEB) triggering early DMA fetches to avoid underrun. Use Value: Configurable thresholds (1–508 words) allow precise tuning of interrupt latency versus buffer utilization in deterministic real-time systems. |
Use Scenario: Replacing obsolete FIFOs in aging telecom line cards while retaining original PCB footprint and signal routing. IC Role / Device Role / Timing Role: Pin-compatible upgrade path offering higher clock speed (67 MHz vs. older 40 MHz parts) and lower power consumption. Use Value: Drop-in replacement capability reduces redesign cost and qualification time; same 132-pin PQ package ensures mechanical and thermal compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3622-30PQ | Same 512 × 36 × 2 architecture but lacks mailbox registers and programmable flag offsets; fixed AF/AE thresholds. | Lower-cost option for static buffer sizing needs; unsuitable where dynamic threshold adjustment or mailbox bypass is required. | Select when system firmware does not require runtime reconfiguration of FIFO fill-level alerts or command-channel separation. |
| SN74ACT3642-30PQ | Identical feature set and pinout; differs only in internal mask revision and minor timing parameter tolerances (e.g., tpd(C-IR) ±0.3 ns). | No functional or application-level difference; qualified for same industrial temperature range and voltage supply. | Preferred for new designs where latest silicon revision and extended lifecycle support are prioritized over legacy stock availability. |
Compared with SN74ACT3622-30PQ, SN74ACT3632-30PQ adds mailbox registers and programmable flag offsets for enhanced system flexibility; compared with SN74ACT3642-30PQ, it offers identical functionality with earlier production revision-both are drop-in replacements in 132-pin PQ layouts.
Availability
SN74ACT3632-30PQ is available at Aetrix Electronics and suitable for microprocessor bus bridging, DSP-to-host interfacing, and industrial PLC backplane applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74ACT3632-30PQ 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 experience in high-reliability timing and interface ICs.
The SN74ACT3632-30PQ belongs to TI's ACT-family clocked FIFO product line, engineered specifically for synchronous, multi-clock-domain data buffering in telecommunications, industrial automation, and digital signal processing systems.
FAQ
What is the maximum supported clock frequency for SN74ACT3632-30PQ?
The SN74ACT3632-30PQ supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs. This specification is validated 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 setup/hold violations or flag synchronization failure.
How does the mailbox register functionality work in SN74ACT3632-30PQ?
The SN74ACT3632-30PQ includes two 36-bit mailbox registers (Mail1 and Mail2) that operate independently of the main FIFOs. Writing to Mail1 occurs on CLKA edge with MBA high; reading occurs on CLKA edge with MBA high and W/RA low. Mail1 flag MBF1 goes low on write and high on Mail1 read via port B. This enables low-latency command exchange without consuming FIFO storage.
Can SN74ACT3632-30PQ operate with CLKA and CLKB running at different frequencies?
Yes, SN74ACT3632-30PQ is explicitly designed for asynchronous operation: CLKA and CLKB may run at different frequencies, phases, or even be stopped independently. All status flags (IRA/ORA/AFA/AEA for port A; IRB/ORB/AFB/AEB for port B) are synchronized to their respective clocks using two-stage flip-flops to suppress metastability during cross-domain sampling.
What is the purpose of the FS0 and FS1 pins on SN74ACT3632-30PQ?
FS0 and FS1 are flag-offset select inputs that determine how almost-full (AFA/AFB) and almost-empty (AEA/AEB) threshold values are loaded during FIFO reset. When high during RST1/RST2 rising edge, they select preset offset values (8, 16, or 64); when both low, the first four writes to FIFO1 program Y1, X1, Y2, X2 registers directly from port-A data lines A8–A0.
Is SN74ACT3632-30PQ pin-compatible with other devices in the same family?
Yes, SN74ACT3632-30PQ is pin-to-pin compatible with SN74ACT3622-30PQ and SN74ACT3642-30PQ in the 132-pin PQ package. This allows direct substitution in existing PCB layouts without modification, though functional differences (e.g., mailbox presence, flag programmability) must be verified in system firmware and timing analysis.
SN74ACT3632-30PQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 132-BQFP Bumpered
- 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:
- 132-BQFP (24.13x24.13)
SN74ACT3632-30PQ FAQ
1.How can I place an order for SN74ACT3632-30PQ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3632-30PQ 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 SN74ACT3632-30PQ reliable?
The price and inventory of SN74ACT3632-30PQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3632-30PQ is usually 5 days.
3.What payment methods are accepted for SN74ACT3632-30PQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3632-30PQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT3632-30PQ?
SN74ACT3632-30PQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3632-30PQ 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 SN74ACT3632-30PQ?
For technical support, including SN74ACT3632-30PQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3632-30PQ requirements.
6.How does Aetrix verify that SN74ACT3632-30PQ is sourced from the original manufacturer or authorized distributors?
All SN74ACT3632-30PQ 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 SN74ACT3632-30PQ meets industry standards.
7.What is the process for return or replacement of SN74ACT3632-30PQ?
All SN74ACT3632-30PQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3632-30PQ, 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 SN74ACT3632-30PQ part is unused and in its original packaging.
Return procedure for SN74ACT3632-30PQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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