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Texas Instruments SN74ABT3612-20PQ
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- Part No.:
- SN74ABT3612-20PQ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
SN74ABT3612-20PQ.pdf
- Description:
- IC FIFO SYNC 64X36X2 132BQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
SN74ABT3612-20PQ from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 64 × 36 dual-port SRAM buffers, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 10 ns read access time, and programmable almost-full/empty flags synchronized per port clock. It enables high-speed data buffering between mismatched microprocessor buses in telecom and industrial control systems.
For engineers reviewing the SN74ABT3612-20PQ datasheet, SN74ABT3612-20PQ pinout, SN74ABT3612-20PQ application, or SN74ABT3612-20PQ equivalent, this device delivers deterministic latency via dual-clock domain synchronization, mailbox-bypass registers for command injection, passive parity checking on both 36-bit ports, and configurable flag offsets for precise buffer management in real-time embedded interfaces.
Technical Context
The SN74ABT3612-20PQ implements two independent clocked FIFOs (FIFO1 and FIFO2), each with separate write/read pointers, full/empty/programmable flags, and mailbox bypass registers (Mail1/Mail2). Its dual-clock architecture allows CLKA and CLKB to operate asynchronously while maintaining metastability-hardened flag synchronization via two-stage flip-flop latching.
All status flags-EFA/FFA/AFA/AEA (synchronized to CLKA) and EFB/FFB/AFB/AEB (synchronized to CLKB)-are edge-triggered and level-sensitive, with reset behavior defined by four low-to-high transitions on each clock while RST is asserted. Flag offset values (4, 8, 12, or 16 words) are latched on RST rising edge via FS0/FS1 inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 64 × 36 × 2 - Two independent FIFOs, each storing 64 words of 36-bit data, enabling simultaneous bidirectional flow without contention. |
| Max Clock Frequency | 67 MHz - Supports high-throughput data transfer between fast microprocessors or ASICs with minimal timing margin constraints. |
| Read Access Time | 10 ns - Enables sub-15 ns cycle times for port-A and port-B reads, critical for real-time DMA handshaking. |
| Flag Synchronization | Two-stage flop synchronization per port clock - Reduces metastability risk when CLKA and CLKB operate asynchronously, ensuring reliable flag assertion timing. |
| Parity Handling | Passive per-port parity check + selectable generation - Detects bit errors on A0–A35/B0–B35 using four byte-wide parity trees; ODD/EVEN input selects parity type. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade industrial applications requiring stable FIFO operation across ambient thermal ranges. |
| Technology | Low-power Advanced BiCMOS - Combines CMOS logic density with bipolar speed for high drive strength and noise immunity at 5 V supply. |
Pinout & Package
SN74ABT3612-20PQ uses a 132-pin Plastic Quad Flat (PQ) package with 0.65 mm pitch, designed for surface-mount assembly and thermal reliability in dense PCB layouts. Pin numbering follows standard PQ top-view orientation with corner pin 1 marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35, B0–B35 | 36-bit bidirectional I/O ports | Port-A and Port-B data buses; tri-stated when CSA/CSB or W/RA/W/RB high; support synchronous read/write gated by CLKA/CLKB edges. |
| CLKA, CLKB | Independent port clocks | Free-running continuous clocks; all transfers synchronized to low-to-high transition; can be asynchronous or coincident with no phase alignment required. |
| EFA/FFA/AFA/AEA, EFB/FFB/AFB/AEB | Synchronized status flags | Empty/full/almost-full/almost-empty indicators; two-stage synchronized to respective port clock; used for handshake-driven flow control in microprocessor interfaces. |
| MBA/MBB, MBF1/MBF2 | Mailbox select and flag signals | Enable direct 36-bit register bypass between ports; MBF1/MBF2 indicate mail register occupancy and prevent overwrites until read. |
| PGA/PGB, ODD/EVEN, PEFA/PEFB | Parity configuration and error reporting | Enable/disable parity generation per port; select odd/even mode; report byte-level parity failure on A/B bus as active-low flag. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables seamless bridging between processors or buses running at different frequencies or phases without external arbitration logic. |
| Programmable flag offset (4/8/12/16) | Allows fine-grained buffer threshold tuning via FS0/FS1 at reset, optimizing interrupt latency and preventing overflow under variable load conditions. |
| Mailbox-bypass registers | Provides dedicated 36-bit command/control path between ports, decoupling critical control traffic from FIFO queuing delays. |
| Passive parity checking with generation | Ensures data integrity across both ports without performance penalty; parity bits generated on-the-fly during reads, eliminating need for software checksum overhead. |
| Metastability-hardened flag synchronization | Two-stage flip-flop staging on all flags reduces probability of metastable output during cross-clock-domain sampling, improving system robustness. |
Applications
| Telecom Line Card Interface | Industrial PLC Backplane Bridge |
|---|---|
Use Scenario: Interfacing DSP-based packet processing engines with legacy TDM bus controllers in multi-service access platforms. IC Role / Device Role / Timing Role: Bidirectional FIFO buffer absorbing clock domain skew between 67 MHz DSP core and 25 MHz TDM controller, with mailbox registers delivering real-time configuration updates. Use Value: Eliminates external glue logic and reduces PCB layer count by integrating dual-clock synchronization, flag generation, and parity into single 132-pin PQ package. | Use Scenario: Connecting modular I/O modules to central motion controller over parallel backplane with mismatched timing budgets. IC Role / Device Role / Timing Role: Clocked FIFO managing bursty sensor data writes from distributed I/O cards while allowing deterministic read scheduling by controller via CLKB-synchronized flags. Use Value: Prevents data loss during transient bus contention by leveraging programmable almost-full thresholds and mailbox-bypass for emergency stop commands. |
| Medical Imaging Data Pipeline | Test Equipment Pattern Generator |
Use Scenario: Buffering high-resolution image frames from FPGA-accelerated acquisition engine to ARM-based display subsystem with variable frame rate. IC Role / Device Role / Timing Role: Dual-port FIFO isolating 67 MHz pixel stream from 33 MHz display controller clock, using AFA/AFB flags to trigger DMA prefetch before buffer underflow. Use Value: Guarantees zero-frame-drop operation through precise fill-level monitoring and 10 ns access time enabling immediate pixel availability upon read request. | Use Scenario: Generating synchronized stimulus patterns for multi-channel semiconductor testers where pattern memory must feed multiple DUT interfaces simultaneously. IC Role / Device Role / Timing Role: FIFO providing independent 36-bit data paths to two test head controllers, with mailbox registers injecting calibration sequences without disrupting ongoing pattern streaming. Use Value: Increases tester uptime by enabling in-flight reconfiguration via bypass registers while main FIFO continues uninterrupted vector delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V3690L15PF | 36-bit × 256 deep, 15 ns access, LVDS-compatible, supports 100 MHz operation but lacks mailbox registers and programmable flag offsets. | Better suited for high-density buffering where depth >64 is required; not drop-in due to different flag architecture and no bypass capability. | Select IDT72V3690L15PF only when deeper memory and higher clock rates outweigh need for mailbox-based command injection. |
| SN74ACT2227-20PQ | Same 64 × 36 × 2 architecture and PQ package, but ACT-family TTL-compatible I/O, 12 ns access, 50 MHz max clock, no parity support. | Compatible pinout and functional set for cost-sensitive designs where parity checking and 67 MHz operation are unnecessary. | Choose SN74ACT2227-20PQ for legacy 5 V systems requiring lower power and relaxed timing, accepting trade-off in speed and data integrity features. |
Compared with IDT72V3690L15PF and SN74ACT2227-20PQ, SN74ABT3612-20PQ uniquely combines 67 MHz operation, mailbox-bypass registers, and programmable flag offsets in a single 132-pin PQ package-making it optimal for real-time embedded bridges requiring deterministic latency and sideband control channeling.
Availability
SN74ABT3612-20PQ is available at Aetrix Electronics and suitable for telecom line card design, industrial PLC backplane integration, medical imaging pipelines, and automated test equipment requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74ABT3612-20PQ 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 interface and memory products.
The SN74ABT3612-20PQ belongs to TI's ABT-series advanced BiCMOS FIFO family, engineered specifically for high-speed, low-latency bidirectional data buffering in mixed-clock-domain systems such as communications infrastructure and industrial automation.
FAQ
What is the maximum supported clock frequency for SN74ABT3612-20PQ?
The SN74ABT3612-20PQ 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 reflects the device's Advanced BiCMOS process optimization for high-speed synchronous operation without requiring external clock conditioning.
Does SN74ABT3612-20PQ support asynchronous clock domains between Port A and Port B?
Yes, SN74ABT3612-20PQ explicitly supports asynchronous operation of CLKA and CLKB. Its flag synchronization logic uses two-stage flip-flops per port clock domain to suppress metastability, enabling reliable handshaking even when clocks run at different frequencies or exhibit arbitrary phase relationships.
How does the mailbox-bypass functionality work in SN74ABT3612-20PQ?
SN74ABT3612-20PQ includes two 36-bit mailbox registers (Mail1 and Mail2) accessible via MBA/MBB controls. Writing to Mail1 occurs on CLKB edge when MBB=high; reading occurs on CLKA edge when MBA=high. Each mailbox has a dedicated flag (MBF1/MBF2) that goes low on write and high on successful read, preventing overwrite until consumed.
What parity configurations are supported by SN74ABT3612-20PQ?
SN74ABT3612-20PQ supports per-port passive parity checking and optional parity generation. ODD/EVEN input selects odd or even parity mode. PGA/PGB enable parity generation on reads; PEFA/PEFB report failures. Parity is computed across four 9-bit bytes (A0–A8, etc.), with MSB serving as parity bit.
Is SN74ABT3612-20PQ pin-compatible with other members of the SN74ABT36xx family?
SN74ABT3612-20PQ shares the same 132-pin PQ footprint and core signal mapping with SN74ABT3611 and SN74ABT3613, but differs in FIFO depth (64 vs. 128/256) and flag configuration. Pin compatibility is maintained for A/B data, clocks, chip selects, and control lines; however, flag count and mailbox behavior vary-requiring firmware validation before substitution.
SN74ABT3612-20PQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 132-BQFP Bumpered
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 4.5K (64 x 36 x 2)
- Function:
- Synchronous
- Data Rate:
- 50MHz
- Access Time:
- 12ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 130mA
- 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)
SN74ABT3612-20PQ FAQ
1.How can I place an order for SN74ABT3612-20PQ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT3612-20PQ 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 SN74ABT3612-20PQ reliable?
The price and inventory of SN74ABT3612-20PQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3612-20PQ is usually 5 days.
3.What payment methods are accepted for SN74ABT3612-20PQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT3612-20PQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT3612-20PQ?
SN74ABT3612-20PQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT3612-20PQ 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 SN74ABT3612-20PQ?
For technical support, including SN74ABT3612-20PQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3612-20PQ requirements.
6.How does Aetrix verify that SN74ABT3612-20PQ is sourced from the original manufacturer or authorized distributors?
All SN74ABT3612-20PQ 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 SN74ABT3612-20PQ meets industry standards.
7.What is the process for return or replacement of SN74ABT3612-20PQ?
All SN74ABT3612-20PQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3612-20PQ, 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 SN74ABT3612-20PQ part is unused and in its original packaging.
Return procedure for SN74ABT3612-20PQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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