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Texas Instruments SN74ACT3632-15PQG4
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- Part No.:
- SN74ACT3632-15PQG4
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
SN74ACT3632-15PQG4.pdf
- Description:
- IC FIFO SYNC 512X36X2 132BQFP
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
SN74ACT3632-15PQG4 from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 36 SRAM buffers, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 11 ns access time, and programmable almost-full/empty flags synchronized per port. It enables high-speed data bridging between mismatched microprocessor buses in telecom backplanes.
For engineers reviewing the SN74ACT3632-15PQG4 datasheet, SN74ACT3632-15PQG4 pinout, SN74ACT3632-15PQG4 application, or SN74ACT3632-15PQG4 equivalent, key selection criteria include dual-port flag synchronization timing, mailbox-bypass register behavior, FIFO reset sequencing, and PQ-132 package compatibility with Yamaichi socket IC51-1324-828.
Technical Context
This device implements two 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 their respective clocks, and two-stage metastability-hardened flag latching. Each FIFO supports programmable almost-empty (AEA/AEB) and almost-full (AFA/AFB) offsets loaded either via FS0/FS1 during reset or programmed from Port A.
The architecture includes dual 36-bit mailbox registers (Mail1/Mail2) with dedicated flags (MBF1/MBF2), enabling non-queued command transfer between ports; mailbox writes are edge-triggered on CLKA/CLKB, and reads clear flags only when MBB/MBA is asserted during active output enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 512 × 36 × 2 - Two independent FIFOs, each buffering 512 words of 36-bit data with full read/write isolation. |
| Max Clock Frequency | 67 MHz - Supports high-throughput inter-processor communication without external clock division. |
| Access Time | 11 ns - Enables direct interface with 67 MHz microprocessors without wait-state insertion. |
| 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 - Qualified for commercial-grade embedded systems including network line cards and industrial controllers. |
| Technology Node | 0.8-µm Advanced CMOS - Delivers low power consumption while maintaining TTL-compatible voltage thresholds. |
| Programmable Offsets | 1–508 words per AF/AE flag - Allows precise buffer-level signaling for DMA trigger thresholds or flow-control arbitration. |
Pinout & Package
SN74ACT3632-15PQG4 uses a 132-pin Plastic Quad Flat (PQ) package with 0.8-mm lead pitch and Yamaichi socket IC51-1324-828 compatibility. Pin functions are fully defined in TI SCAS224D Rev. April 1998, including NC (no internal connection) pins at positions 1, 2, 3, 4, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, and 132.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit 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 I/O path for FIFO1 read/FIFO2 write; high-impedance when CSB or W/RB low. |
| CLKA / CLKB | Asynchronous port clocks | Independent synchronous timing domains; all port-A flags synchronized to CLKA, all port-B flags to CLKB. |
| CSA / CSB | Port chip select inputs | Active-low enables; disables data bus drivers and blocks clock-gated transfers when deasserted. |
| W/RA / W/RB | Port write/read control | W/RA high = write to FIFO1; W/RB low = write to FIFO2; both control direction and bus driver state. |
| ENA / ENB | Port enable inputs | High enables clock-gated transfers; required with CSA/CSB and W/RA/W/RB for valid read/write cycles. |
| IRA / IRB | Input-ready flags | Synchronized to CLKA/CLKB; low indicates FIFO full and blocks further writes until space becomes available. |
| ORA / ORB | Output-ready flags | Synchronized to CLKA/CLKB; high indicates valid data in output register and enables read operations. |
| AFA / AFB / AEA / AEB | Programmable status flags | AF flags indicate near-full condition; AE flags indicate near-empty; all offset-programmable and clock-synchronized. |
| MBA / MBB | Mailbox select inputs | High selects Mail2/Mail1 register instead of FIFO output register for port-A/port-B data reads/writes. |
| MBF1 / MBF2 | Mailbox full flags | Low indicates mailbox occupied; cleared by corresponding port read with MBA/MBB high. |
| RST1 / RST2 | Independent FIFO resets | Asynchronous active-high; requires four CLKA+CLKB transitions low-to-high to initialize pointers and flags. |
| FS0 / FS1 | Flag offset select inputs | Latched on RST1/RST2 rising edge to select preset AF/AE offsets (8, 16, or 64) or enable port-A programming mode. |
| VCC / GND | Power supply terminals | Multiple VCC (pins 5, 22, 36, 56, 95, 96, 102, 110, 116) and GND (pins 8, 18, 25, 44, 53, 70, 84, 91, 107, 113) pins ensure low-noise operation across high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | CLKA and CLKB support fully asynchronous operation or precise coincidence-enables bridging between unrelated clock trees without PLLs. |
| Mailbox-bypass registers | Two 36-bit registers (Mail1/Mail2) with dedicated flags (MBF1/MBF2) allow immediate command handoff without FIFO queuing latency. |
| Programmable flag offsets | AF/AE thresholds configurable from 1–508 words via port-A writes or preset values (8/16/64) selected by FS0/FS1 at reset. |
| Metastability-hardened flag logic | All status flags use two-stage synchronizers per port clock-guarantees reliable flag assertion under worst-case asynchronous clock skew. |
| Microprocessor interface logic | Integrated CSA/CSB, W/RA/W/RB, ENA/ENB decoding eliminates need for external glue logic in 80x86 or Motorola 68k bus interfacing. |
| Pin-to-pin compatibility | Direct replacement for SN74ACT3622 and SN74ACT3642-enables drop-in upgrade path with identical PCB layout and signal routing. |
Applications
| Telecom Backplane Data Bridge | Industrial PLC Dual-CPU Interface |
|---|---|
Use Scenario: Interfacing line-card processors running at different clock domains in a modular switch chassis. IC Role / Device Role / Timing Role: Bidirectional FIFO buffering with independent CLKA/CLKB domains and mailbox registers for control message exchange. Use Value: Eliminates need for external clock domain crossing logic while providing deterministic 11 ns latency for payload data and sub-cycle flag response for flow control. |
Use Scenario: Synchronizing real-time I/O scanning CPU with supervisory safety CPU in redundant PLC architecture. IC Role / Device Role / Timing Role: Clocked FIFO with RST1/RST2 isolation and programmable AE/AF flags for deterministic buffer-level handshaking. Use Value: Enables guaranteed zero-data-loss communication during failover events using mailbox-triggered reset sequences and synchronized status reporting. |
| DSP-FPGA Co-Processing Link | Legacy Bus Protocol Translator |
Use Scenario: Streaming sensor data from FPGA-accelerated preprocessing to TI C6000 DSP with burst-mode DMA. IC Role / Device Role / Timing Role: FIFO depth management via AFA/AFB flags tied to DSP DMA request lines; mailbox registers convey frame metadata. Use Value: Matches 67 MHz DSP bus timing while allowing FPGA to operate at higher frequency; programmable offsets align DMA triggers with optimal buffer fill levels. |
Use Scenario: Adapting ISA-bus peripherals to PCI Express-based host controller via bridge ASIC. IC Role / Device Role / Timing Role: Protocol-agnostic data staging element with microprocessor interface logic compatible with ISA address/data strobes. Use Value: Provides seamless timing translation between 8-MHz ISA and 100-MHz PCIe domains using CLKA/CLKB as domain anchors and IRA/ORB for ready signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT3622 | Same 512 × 36 × 2 architecture but lacks mailbox registers and MBF1/MBF2 flags; no bypass capability. | Cannot support concurrent command + data transfer; requires external logic for control channel separation. | Select SN74ACT3622 only if mailbox functionality is unused and cost reduction is critical. |
| SN74ACT3642 | Identical pinout and feature set but specified for –40°C to 85°C industrial temperature range; same 67 MHz/11 ns performance. | Valid for extended-temperature deployments such as outdoor base stations or factory-floor controllers. | Choose SN74ACT3642 when operating outside 0°C–70°C commercial range; otherwise SN74ACT3632-15PQG4 is functionally identical. |
Compared with SN74ACT3622, SN74ACT3632-15PQG4 adds mailbox-bypass capability essential for control/data decoupling; compared with SN74ACT3642, it trades industrial temp rating for lower cost in commercial environments-both alternatives retain pin-to-pin compatibility but differ in thermal qualification and feature completeness.
Availability
SN74ACT3632-15PQG4 is available at Aetrix Electronics and suitable for telecom backplane design, industrial PLC integration, and DSP-FPGA co-processing applications requiring stable component supply, long-lifecycle support, and verified timing compliance.
Supply support for SN74ACT3632-15PQG4 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 timing and interface ICs.
The SN74ACT3632 belongs to TI's advanced clocked FIFO product line, engineered specifically for deterministic, low-latency data bridging between asynchronous digital subsystems in networking, automation, and signal processing equipment.
FAQ
What is the maximum supported clock frequency for SN74ACT3632-15PQG4?
The SN74ACT3632-15PQG4 supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs. This specification is validated across the full 0°C to 70°C operating temperature range and ensures reliable 11 ns access time with proper setup/hold timing margins per the SCAS224D datasheet.
How does the mailbox-bypass functionality work in SN74ACT3632-15PQG4?
The SN74ACT3632-15PQG4 includes two 36-bit mailbox registers (Mail1 and Mail2) with dedicated flags MBF1 and MBF2. Writing to Mail1 is triggered by CLKA edge with MBA high; reading clears MBF1 only when MBB is high during CLKB edge. This enables lock-free command exchange independent of FIFO queuing.
Can SN74ACT3632-15PQG4 operate with completely asynchronous CLKA and CLKB clocks?
Yes, SN74ACT3632-15PQG4 is explicitly designed for asynchronous CLKA and CLKB operation. All port-A flags (IRA, ORA, AFA, AEA) are two-stage synchronized to CLKA, and all port-B flags (IRB, ORB, AFB, AEB) to CLKB-ensuring metastability immunity even under worst-case clock skew conditions.
What are the reset requirements for SN74ACT3632-15PQG4 FIFOs?
Each FIFO in SN74ACT3632-15PQG4 requires independent reset: RST1 must be held low for ≥4 CLKA and ≥4 CLKB transitions before rising edge to initialize FIFO1; similarly, RST2 controls FIFO2. Both resets must occur at power-up before any data write to prevent undefined pointer states.
How are the almost-full and almost-empty flag offsets programmed in SN74ACT3632-15PQG4?
SN74ACT3632-15PQG4 supports two offset programming modes: (1) Preset values (8, 16, or 64) selected by FS0/FS1 latched on RST1/RST2 rising edge; or (2) Custom 1–508 word values written to Y1/X1/Y2/X2 registers via first four writes to FIFO1 after simultaneous RST1+RST2 with FS0=FS1=low.
SN74ACT3632-15PQG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 132-BQFP Bumpered
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 36K (512 x 36 x 2)
- Function:
- Synchronous
- Data Rate:
- 66.7MHz
- Access Time:
- 11ns
- 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)
SN74ACT3632-15PQG4 FAQ
1.How can I place an order for SN74ACT3632-15PQG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT3632-15PQG4 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 SN74ACT3632-15PQG4 reliable?
The price and inventory of SN74ACT3632-15PQG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3632-15PQG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT3632-15PQG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3632-15PQG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT3632-15PQG4?
SN74ACT3632-15PQG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT3632-15PQG4 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 SN74ACT3632-15PQG4?
For technical support, including SN74ACT3632-15PQG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3632-15PQG4 requirements.
6.How does Aetrix verify that SN74ACT3632-15PQG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT3632-15PQG4 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 SN74ACT3632-15PQG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT3632-15PQG4?
All SN74ACT3632-15PQG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3632-15PQG4, 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 SN74ACT3632-15PQG4 part is unused and in its original packaging.
Return procedure for SN74ACT3632-15PQG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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