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Texas Instruments SN74ABT3614-30PCB
- Part No.:
- SN74ABT3614-30PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ABT3614-30PCB.pdf
- Description:
- IC FIFO SYNC 64X36X2 120HLQFP
- Quantity:
- Payment:
- Shipping:
Inventory:430
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Product details
Overview
SN74ABT3614-30PCB from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 64 × 36 dual-port SRAM buffers, supporting up to 67 MHz clock frequency, 10 ns read-access time, and dynamic port-B bus sizing (36/18/9 bits) with big/little-endian selection - used in high-bandwidth microprocessor interconnects requiring asynchronous clock domain bridging.
For engineers reviewing the SN74ABT3614-30PCB datasheet, SN74ABT3614-30PCB pinout, SN74ABT3614-30PCB application, or SN74ABT3614-30PCB equivalent, key selection criteria include dual-clock domain synchronization, mailbox-bypass register support, programmable almost-full/empty flags, passive parity checking per port, and PCB-package pin compatibility for legacy board reuse.
Technical Context
The SN74ABT3614-30PCB implements two independent clocked FIFOs (FIFO1 and FIFO2), each with 64 × 36-bit SRAM depth, where data flows bidirectionally: FIFO1 accepts writes on Port-A (A0–A35) synchronized to CLKA and enables reads on Port-B (B0–B35) synchronized to CLKB, and vice versa. All status flags (EFA/FFA/AEA/AFA, EFB/FFB/AEB/AFB) are two-stage synchronized to their respective port clocks to suppress metastability across asynchronous domains.
Port-B supports dynamic bus sizing via SIZ0/SIZ1 and endian selection via BE, enabling 36-bit long-word, 18-bit word, or 9-bit byte transfers - with byte-order swapping controlled by SW0/SW1. Mailbox registers (Mail1/Mail2) provide non-queued command/data exchange, each with dedicated flag (MBF1/MBF2) and microprocessor interface logic including chip select (CSA/CSB), enable (ENA/ENB), and write/read control (W/RA/W/RB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 64 × 36 × 2 independent FIFOs - provides 2,304-bit buffering per FIFO with full read/write separation between ports. |
| Max Clock Frequency | 67 MHz - enables high-throughput data transfer in real-time interconnect applications such as network bridges or DMA controllers. |
| Read Access Time | 10 ns - guarantees deterministic latency for time-critical microprocessor-to-peripheral handshaking. |
| Operating Temperature Range | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control interfaces. |
| Parity Support | Passive per-port parity checking + selectable generation - detects single-bit errors on A0–A35 and B0–B35 without adding pipeline delay. |
| Flag Programmability | Four AF/AE offset values (4/8/12/16 words) set via FS0/FS1 - allows fine-grained flow control tuning for variable burst lengths. |
| Bus Matching | Dynamic 36/18/9-bit Port-B sizing with big/little-endian and byte-swap modes - eliminates external glue logic when interfacing mixed-width peripherals. |
Pinout & Package
SN74ABT3614-30PCB 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 blocks (Port-A, Port-B, control, clocks, power).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit I/O interface for FIFO2 read/write and Mail2 access; high-impedance when CSA or W/RA high. |
| B0–B35 | Port-B bidirectional data bus | 36-bit I/O interface for FIFO1 read/write and Mail1 access; bus size dynamically configured via SIZ0/SIZ1/BE. |
| CLKA, CLKB | Free-running port clocks | Independent synchronous timing sources; support asynchronous or coincident operation; all flags and transfers edge-triggered on low-to-high transition. |
| CSA, CSB | Port chip select inputs | Enable port activity only when low; place corresponding data bus in high-Z state when deasserted. |
| W/RA, W/RB | Port write/read direction control | High = write, low = read; determines data flow direction and output register sourcing (FIFO vs. mailbox). |
| EFA, EFB, FFA, FFB | Synchronized empty/full flags | Two-stage registered outputs indicating FIFO fill state; EFA/FFA tied to CLKA, EFB/FFB tied to CLKB. |
| AFA, AFB, AEA, AEB | Programmable almost-full/empty flags | Configurable threshold flags (offset X = 4/8/12/16) for early flow control signaling before full/empty conditions occur. |
| MBA, MBF1, MBF2 | Mailbox control and status | MBA selects Mail2 for Port-A access; MBF1/MBF2 indicate pending mail and inhibit further writes until read. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | CLKA and CLKB operate asynchronously or coincidentally - enables robust bridging between mismatched processor/peripheral clocks without external synchronizers. |
| Mailbox-bypass registers | Two 36-bit registers (Mail1/Mail2) with dedicated flags (MBF1/MBF2) - allow immediate command/control exchange without FIFO queuing latency. |
| Dynamic Port-B bus sizing | Runtime-selectable 36-bit (long word), 18-bit (word), or 9-bit (byte) mode with big/little-endian configuration - reduces need for external multiplexers in heterogeneous bus systems. |
| Byte-order swapping | Four modes (no swap, byte swap, word swap, byte-word swap) selectable via SW0/SW1 - ensures correct data alignment across architectures with differing endianness. |
| Two-stage synchronized flags | All status flags (EFA/FFA/AEA/AFA, EFB/FFB/AEB/AFB) use dual flip-flop staging - mitigates metastability risk in asynchronous clock domain crossings. |
Applications
| Network Bridge Interface | Microprocessor DMA Controller |
|---|---|
Use Scenario: Bridging two Ethernet MACs operating at different clock domains while maintaining packet integrity and flow control. IC Role / Device Role / Timing Role: Bidirectional FIFO buffer with independent CLKA/CLKB clocks, mailbox registers for control message passing, and programmable AF/EF flags for adaptive backpressure. Use Value: Eliminates external clock-domain crossing logic and enables deterministic latency for jumbo frame handling at line rate. |
Use Scenario: Offloading bursty peripheral data (e.g., ADC, video encoder) to main memory via DMA without CPU intervention. IC Role / Device Role / Timing Role: High-speed FIFO with 67 MHz clock support and 10 ns access time, synchronized to DMA controller clock (CLKA) and peripheral clock (CLKB). Use Value: Prevents DMA starvation during variable-latency peripheral reads and absorbs burst traffic exceeding sustained bus bandwidth. |
| Industrial Protocol Gateway | Legacy Bus Adapter |
Use Scenario: Translating Modbus RTU (RS-485) to EtherCAT using a microcontroller with mismatched internal/external clock domains. IC Role / Device Role / Timing Role: Asynchronous FIFO with parity checking on both ports and dynamic Port-B bus sizing to match RS-485 framing (8-bit) and EtherCAT frame structure (32-bit). Use Value: Ensures error detection across protocol boundaries and avoids software-based bit manipulation for byte ordering. |
Use Scenario: Adapting an older 16-bit ISA bus peripheral to a modern 32-bit PCI Express host system via FPGA bridge. IC Role / Device Role / Timing Role: Bus-matching FIFO with big/little-endian selection and byte-swapping modes, allowing seamless data reordering between x86 and ARM subsystems. Use Value: Removes requirement for custom RTL in FPGA to handle endian conversion and partial-word transfers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V2115L15PF | 32 × 18 × 2 FIFO, 15 ns access, 100 MHz max clock, 144-pin PQFP - smaller depth, higher speed, no mailbox registers or byte-swapping. | Lacks bus matching, endian control, and bypass registers - suitable only for simple clock-domain crossing without protocol adaptation. | Select when lower latency and higher clock rate outweigh need for flexible bus sizing and mailbox features. |
| SN74ABT3612-30PCB | 64 × 18 × 2 FIFO, same package and control logic - half the width per port, identical clocking, flag behavior, and feature set except bus-size options limited to 18/9-bit. | Cannot support 36-bit wide transfers or full-word byte-swapping - restricts use to narrower data paths or requires parallel stacking. | Choose when system data path is ≤18 bits and cost reduction via smaller die is prioritized over flexibility. |
Compared with IDT72V2115L15PF and SN74ABT3612-30PCB, SN74ABT3614-30PCB uniquely delivers 36-bit-wide bus matching with runtime endian and byte-swap control plus dual mailbox registers - making it irreplaceable in applications requiring protocol-aware bridging without FPGA logic overhead.
Availability
SN74ABT3614-30PCB is available at Aetrix Electronics and suitable for network bridge interfaces, microprocessor DMA controllers, industrial protocol gateways, and legacy bus adapters requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT3614-30PCB 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 experience in high-reliability interface and memory products.
The SN74ABT3614-30PCB belongs to TI's advanced BiCMOS FIFO family designed specifically for high-speed, low-power asynchronous data buffering in microprocessor-centric systems requiring clock domain isolation and flexible bus interfacing.
FAQ
What is the maximum supported clock frequency for SN74ABT3614-30PCB?
The SN74ABT3614-30PCB 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 or metastability in flag outputs.
Does SN74ABT3614-30PCB support independent clock domains?
Yes, SN74ABT3614-30PCB explicitly supports independent, asynchronous clock domains via separate free-running CLKA and CLKB inputs. Its two-stage synchronized flags (EFA/FFA/AEA/AFA on CLKA; EFB/FFB/AEB/AFB on CLKB) ensure reliable status reporting across clock boundaries without external synchronizers.
How does the mailbox-bypass functionality work in SN74ABT3614-30PCB?
SN74ABT3614-30PCB includes two 36-bit mailbox registers (Mail1 and Mail2), each with dedicated status flags (MBF1 and MBF2). Writing to Mail1 occurs on CLKB when CSB, W/RB, ENB are active and SIZ0/SIZ1 are high; reading occurs similarly. Mail2 is accessed via Port-A using MBA. Flags go low on write and high on successful read - enabling handshake-free command passing.
Can SN74ABT3614-30PCB perform byte-order swapping on Port-B?
Yes, SN74ABT3614-30PCB supports four byte-order swapping modes on Port-B (no swap, byte swap, word swap, byte-word swap) selected by SW0 and SW1 inputs. These modes apply to all bus sizes (36/18/9-bit) and are synchronized to CLKB, enabling automatic data reordering for mixed-endian system integration.
What package type is used for SN74ABT3614-30PCB?
SN74ABT3614-30PCB uses a 120-pin Thin Quad Flat Package (TQFP) designated "PCB" by Texas Instruments, with 0.4 mm lead pitch and JEDEC-standard footprint. This package is distinct from the 132-pin PQ package variant and is optimized for space-constrained commercial PCB layouts requiring thermal reliability.
SN74ABT3614-30PCB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 120-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 4.5K (64 x 36 x 2)
- Function:
- Synchronous
- Data Rate:
- 33.4MHz
- Access Time:
- 15ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 130mA
- 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:
- 120-HLQFP (14x14)
SN74ABT3614-30PCB FAQ
1.How can I place an order for SN74ABT3614-30PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT3614-30PCB 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 SN74ABT3614-30PCB reliable?
The price and inventory of SN74ABT3614-30PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3614-30PCB is usually 5 days.
3.What payment methods are accepted for SN74ABT3614-30PCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT3614-30PCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT3614-30PCB?
SN74ABT3614-30PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT3614-30PCB 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 SN74ABT3614-30PCB?
For technical support, including SN74ABT3614-30PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3614-30PCB requirements.
6.How does Aetrix verify that SN74ABT3614-30PCB is sourced from the original manufacturer or authorized distributors?
All SN74ABT3614-30PCB 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 SN74ABT3614-30PCB meets industry standards.
7.What is the process for return or replacement of SN74ABT3614-30PCB?
All SN74ABT3614-30PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3614-30PCB, 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 SN74ABT3614-30PCB part is unused and in its original packaging.
Return procedure for SN74ABT3614-30PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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