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Texas Instruments SN74ABT3614-15PQ
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- Part No.:
- SN74ABT3614-15PQ
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
SN74ABT3614-15PQ.pdf
- Description:
- IC FIFO SYNC 64X36X2 132BQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ABT3614-15PQ from Texas Instruments is a 64 × 36 × 2 clocked bidirectional FIFO memory IC with bus matching and byte swapping, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 10 ns access time, and dual independent FIFOs for cross-domain data buffering in telecom and networking systems.
For engineers reviewing the SN74ABT3614-15PQ datasheet, SN74ABT3614-15PQ pinout, SN74ABT3614-15PQ application, or SN74ABT3614-15PQ equivalent, key selection considerations include port-A/port-B clock domain isolation, programmable almost-full/empty flag offsets, dynamic 36/18/9-bit port-B bus sizing, big/little-endian byte ordering, and mailbox-bypass register support for control-message handshaking.
Technical Context
The SN74ABT3614-15PQ implements two independent 64-word × 36-bit synchronous FIFOs with fully separated read/write clocks (CLKA/CLKB), each with two-stage synchronized status flags (EFA/FFA/AEA/AFA on CLKA; EFB/FFB/AEB/AFB on CLKB) to prevent metastability across asynchronous domains.
It integrates mailbox-bypass registers (mail1/mail2), passive parity checking per port with selectable generation, and dynamic port-B bus sizing (36-bit long word, 18-bit word, or 9-bit byte) with configurable endianness and four-byte-swap modes-enabling seamless interface bridging between heterogeneous microprocessors and peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 64 × 36 × 2 independent FIFOs - supports full-duplex buffering of 64 long words per direction without shared memory contention. |
| Max Clock Frequency | 67 MHz - enables high-throughput data transfer in real-time packet processing and DMA-coordinated I/O subsystems. |
| Read Access Time | 10 ns - guarantees deterministic latency for time-critical read operations in synchronous bus interfaces. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including network switches and protocol converters. |
| Port-B Bus Sizing | 36-bit / 18-bit / 9-bit - dynamically selectable via SIZ0/SIZ1 latched on CLKB edge, enabling compatibility with legacy 8/16-bit peripherals. |
| Byte Swapping Modes | 4 modes (no swap, byte swap, word swap, byte-word swap) - controlled by SW0/SW1, essential for endian conversion in internetworking applications. |
| Parity Support | Passive per-port parity check + optional generation - ODD/EVEN input selects parity type; PEFA/PEFB flag errors on mismatched bytes. |
Pinout & Package
SN74ABT3614-15PQ uses a 132-pin Quad Flat (PQ) package with exposed thermal pad, optimized for high-density PCB layouts in telecom line cards and industrial controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35 | Port-A bidirectional data bus | 36-bit I/O interface for FIFO2 read/write and mail2 register 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 register access; bus size dynamically configured via SIZ0/SIZ1. |
| 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; disable outputs to high-impedance state when high - critical for multi-device bus sharing. |
| 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 emptiness (EFA/EFB) or fullness (FFA/FFB); used for handshake-driven flow control. |
| AFA, AFB, AEA, AEB | Programmable almost-full/empty flags | Configurable thresholds (4/8/12/16 words) set by FS0/FS1 at reset; enable early warning for buffer management in bursty traffic. |
| MBA, MBF1, MBF2 | Mailbox control and status | MBA selects mail2 register on port A; MBF1/MBF2 indicate pending mail - enables non-blocking command channel alongside FIFO data path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Enables reliable data transfer between asynchronous systems (e.g., CPU ↔ FPGA, DSP ↔ ASIC) without external synchronization logic. |
| Dynamic port-B bus sizing | Eliminates need for external multiplexers or glue logic when interfacing with 8-, 16-, or 32-bit peripherals via single hardware design. |
| Four-byte-swap modes with endian selection | Supports interoperability across x86 (little-endian) and PowerPC/MIPS (big-endian) subsystems in protocol translation gateways. |
| Mailbox-bypass registers | Provides dedicated low-latency control channel for initialization commands, status updates, or interrupt signaling-decoupled from FIFO data flow. |
| Programmable AF/AE flag offsets | Allows tuning of buffer watermark thresholds to match application-specific burst lengths and latency budgets in real-time streaming. |
Applications
| Telecom Line Interface | Network Protocol Converter |
|---|---|
|
Use Scenario: Bridging TDM voice channels to packet-switched Ethernet using a DSP and ARM processor operating at different clock domains. IC Role / Device Role / Timing Role: SN74ABT3614-15PQ acts as a clock-domain crossing FIFO, buffering PCM samples from CLKA-synchronized DSP and delivering them to CLKB-synchronized MAC controller. Use Value: Eliminates FIFO underrun/overrun during clock drift; mailbox registers exchange frame sync signals without consuming FIFO depth. |
Use Scenario: Converting Modbus RTU serial frames to TCP/IP packets in an industrial gateway with separate UART and Ethernet controller clocks. IC Role / Device Role / Timing Role: SN74ABT3614-15PQ serves as bidirectional data conduit: port-A handles UART-side byte-aligned receive, port-B feeds TCP stack via 32-bit bus with byte-swapped payload. Use Value: Dynamic 9-bit port-B sizing matches UART byte width; byte-swap mode ensures correct octet ordering for big-endian TCP header generation. |
| DMA-Coordinated Data Acquisition | Multi-Processor Shared Memory Bridge |
|
Use Scenario: High-speed ADC sampling system where FPGA acquires data and ARM CPU processes it, requiring zero-wait-state buffering with flow control. IC Role / Device Role / Timing Role: SN74ABT3614-15PQ provides dual FIFO path: FPGA writes to FIFO1 (CLKB), CPU reads from FIFO2 (CLKA); AF/FF flags trigger DMA requests. Use Value: 10 ns access time meets tight timing closure; programmable almost-full threshold prevents DMA overrun during burst transfers. |
Use Scenario: Interconnecting two dissimilar microcontrollers (e.g., Cortex-M4 and RISC-V core) sharing sensor data and control commands over separate buses. IC Role / Device Role / Timing Role: SN74ABT3614-15PQ functions as a dual-port memory bridge: one MCU writes control messages to mail1 register, other reads via port-B with BE=low for little-endian alignment. Use Value: Mailbox bypass avoids FIFO queuing delay for time-critical commands; parity checking ensures integrity of configuration updates. |
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 | 64 × 18 × 2 FIFO, 132-pin PQFP, 15 ns access, LVDS-compatible I/O, no mailbox registers or byte swapping. | Limited to 18-bit bus width; lacks port-B dynamic sizing and endian control - suitable only for fixed-width synchronous links. | Choose when lower pin count, LVDS signaling, or reduced feature set suffices and byte-level flexibility is unnecessary. |
| ICS650-03CQ | 64 × 36 × 2 FIFO, 128-pin PQFP, 12 ns access, integrated PLL for clock multiplication, no parity or mailbox features. | Includes on-chip PLL but omits parity checking, mailbox registers, and bus-matching logic - targets clock-synchronized backplane designs. | Select when clock synthesis is required and parity integrity or control-channel separation is not critical. |
Compared with IDT72V2115L15PF and ICS650-03CQ, SN74ABT3614-15PQ uniquely combines 36-bit bus matching, four-byte-swap modes, mailbox bypass, and parity support in a single 132-pin PQ package - making it the only option for complex, mixed-endian, multi-protocol bridging where control/data separation and error detection are mandatory.
Availability
SN74ABT3614-15PQ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol gateways, and multi-processor embedded systems requiring stable component supply across extended production lifecycles.
Supply support for SN74ABT3614-15PQ 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 for industrial, automotive, and communications markets.
The SN74ABT3614-15PQ belongs to TI's advanced BiCMOS FIFO memory product line, designed specifically for high-reliability, clock-domain-crossing applications in internetworking equipment and real-time data acquisition systems.
FAQ
What is the maximum supported clock frequency for SN74ABT3614-15PQ?
The SN74ABT3614-15PQ supports clock frequencies up to 67 MHz on both CLKA and CLKB ports. This specification is validated across the full commercial temperature range (0°C to 70°C) and enables high-bandwidth data transfer in real-time communication systems. The device achieves this performance using low-power Advanced BiCMOS technology while maintaining 10 ns read-access time.
Does SN74ABT3614-15PQ support asynchronous clock domains between port A and port B?
Yes, SN74ABT3614-15PQ explicitly supports asynchronous operation between CLKA and CLKB - they may run at different frequencies, phases, or even be stopped independently. All status flags (EFA/FFA/AEA/AFA and EFB/FFB/AEB/AFB) are two-stage synchronized to their respective port clocks to suppress metastability, ensuring robust handshaking across clock boundaries.
How does the mailbox-bypass functionality work in SN74ABT3614-15PQ?
SN74ABT3614-15PQ includes two 36-bit mailbox registers (mail1 and mail2) that operate independently of the main FIFOs. Writing to mail1 is triggered by CLKB edge when CSB/W/RB/ENB active and SIZ0=SIZ1=high; reading is enabled via port-B data bus. Similarly, mail2 is accessed via port-A using MBA. Each mailbox has a dedicated flag (MBF1/MBF2) that goes low on write and high on successful read - enabling non-blocking command exchange.
Can SN74ABT3614-15PQ perform byte-order conversion for 16-bit or 8-bit data transfers?
Yes, SN74ABT3614-15PQ supports byte-order swapping on port-B for all bus sizes: 36-bit long word, 18-bit word, and 9-bit byte. SW0/SW1 select among four modes - no swap, byte swap, word swap, or byte-word swap - while BE determines big- or little-endian byte selection within the active bus width. This allows seamless integration with processors having mismatched endianness.
What is the role of the FS0 and FS1 pins in SN74ABT3614-15PQ?
FS0 and FS1 are flag offset select inputs that configure the programmable almost-full (AFA/AFB) and almost-empty (AEA/AEB) thresholds during device reset. A rising edge on RST latches FS0/FS1 to load one of four preset values (4, 8, 12, or 16 words) into the internal offset register X - allowing designers to tune buffer watermark levels based on traffic burst characteristics and system latency requirements.
SN74ABT3614-15PQ 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:
- 66.7MHz
- Access Time:
- 10ns
- 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:
- 132-BQFP (24.13x24.13)
SN74ABT3614-15PQ FAQ
1.How can I place an order for SN74ABT3614-15PQ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT3614-15PQ 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 SN74ABT3614-15PQ reliable?
The price and inventory of SN74ABT3614-15PQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3614-15PQ is usually 5 days.
3.What payment methods are accepted for SN74ABT3614-15PQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT3614-15PQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT3614-15PQ?
SN74ABT3614-15PQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT3614-15PQ 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 SN74ABT3614-15PQ?
For technical support, including SN74ABT3614-15PQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3614-15PQ requirements.
6.How does Aetrix verify that SN74ABT3614-15PQ is sourced from the original manufacturer or authorized distributors?
All SN74ABT3614-15PQ 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 SN74ABT3614-15PQ meets industry standards.
7.What is the process for return or replacement of SN74ABT3614-15PQ?
All SN74ABT3614-15PQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3614-15PQ, 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 SN74ABT3614-15PQ part is unused and in its original packaging.
Return procedure for SN74ABT3614-15PQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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