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Home > Products > Integrated Circuits (ICs) > Logic > FIFOs Memory

Texas Instruments SN74ABT3614-30PQ

Name: SN74ABT3614-30PQ
Brand: Texas Instruments
SKU: SN74ABT3614-30PQ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT3614-30PQ

Manufacturer:: Texas Instruments

Category:: FIFOs Memory

Package:: 132-BQFP Bumpered

Datasheet:: SN74ABT3614-30PQ.pdf

Description:: IC FIFO SYNC 64X36X2 132BQFP

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Product details

Overview

SN74ABT3614-30PQ 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 dynamic port-B bus sizing (36/18/9 bits) with big-/little-endian and byte-swapping modes. It enables high-bandwidth interprocessor communication in telecom backplanes.

For engineers reviewing the SN74ABT3614-30PQ datasheet, SN74ABT3614-30PQ pinout, SN74ABT3614-30PQ application, or SN74ABT3614-30PQ equivalent, key selection criteria include its dual-clock synchronization architecture, mailbox-bypass register support, programmable almost-full/empty flags, passive parity checking per port, and PQ-132 package compatibility with legacy TI FIFO designs.

Technical Context

The SN74ABT3614-30PQ implements two independent 64-word × 36-bit clocked FIFOs with fully synchronous, edge-triggered interfaces on both ports. Each FIFO uses two-stage flag synchronization to CLKA or CLKB to suppress metastability during asynchronous clock domain crossing.

Port-B supports dynamic bus sizing (36/18/9 bits) and four byte-swap modes (no swap, byte swap, word swap, byte-word swap), all latched and executed synchronously to CLKB. Mailbox registers (mail1/mail2) provide non-queued 36-bit command transfer between ports, each with dedicated status flags (MBF1/MBF2) and microprocessor interface logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width	Two independent 64 × 36-bit SRAM FIFOs - enables full-duplex buffering of 2,304 bits per FIFO with no shared address space.
Max Clock Frequency	67 MHz - supports high-throughput data streaming between mismatched bus domains without external arbitration.
Read Access Time	10 ns - guarantees deterministic latency for real-time control loops reading FIFO output registers.
Port-B Bus Configurations	36-bit long word, 18-bit word, or 9-bit byte with selectable big-/little-endian - allows direct interfacing to peripherals with varying native word widths.
Flag Synchronization	Two-stage flip-flop sync for EFA/FFA/AEA/AFA to CLKA and EFB/FFB/AEB/AFB to CLKB - eliminates metastability risk in asynchronous clock domain crossings.
Parity Handling	Passive per-port parity checking + optional generation - detects single-bit errors on A0–A35 and B0–B35 with configurable odd/even mode via ODD/EVEN input.
Operating Temperature	0°C to +70°C - qualified for commercial-grade embedded systems including network interface cards and industrial controllers.

Pinout & Package

SN74ABT3614-30PQ is housed in a 132-pin Quad Flat (PQ) package with 0.8 mm lead pitch, designed for surface-mount assembly and thermal reliability in high-density PCB layouts.

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/BE.
CLKA, CLKB	Free-running port clocks	Independent, continuous clocks synchronized to all port operations; support asynchronous or coincident timing with two-stage flag sync.
CSA, CSB	Port chip select inputs	Enable low-to-high transitions on CLKA/CLKB for read/write; force A0–A35/B0–B35 into high-Z when deasserted.
W/RA, W/RB	Port write/read direction controls	High = write, low = read; determine data flow direction and output register sourcing (FIFO vs. mailbox).
ENA, ENB	Port enable inputs	Gate clock-triggered transfers; required high to activate CLKA/CLKB edge-sensitive operation.
EFA, EFB	Empty flags	Synchronized to CLKA/CLKB; low = FIFO2/FIFO1 empty and read disabled; set high after second clock edge post-reset or fill.
FFA, FFB	Full flags	Synchronized to CLKA/CLKB; low = FIFO1/FIFO2 full and write disabled; initialized low at reset, set high after two clock edges.
AFA, AFB, AEA, AEB	Programmable almost-full/empty flags	Synchronized to respective port clocks; offset set by FS0/FS1 at RST↑; used for early flow control before full/empty states.
MBF1, MBF2	Mailbox status flags	Low = mail1/mail2 register occupied; high = ready for new write; asserted on write, cleared on corresponding port read.
SIZ0, SIZ1, BE, SW0, SW1	Port-B configuration controls	Set bus size (36/18/9), endianness, and byte-swap mode; latched on CLKB↑, applied on next CLKB↑.
RST	Asynchronous reset input	Four CLKA↑ + four CLKB↑ while low initializes all pointers, flags, and offset register; required after power-up.

Key Features

Feature	Design Value
Dual independent clock domains	CLKA and CLKB operate asynchronously or coincidently - eliminates need for global clock distribution and enables heterogeneous system integration.
Mailbox-bypass registers	Two 36-bit registers (mail1/mail2) with dedicated flags (MBF1/MBF2) - provides zero-latency command channel alongside FIFO data path.
Dynamic Port-B bus sizing	Runtime-selectable 36/18/9-bit transfers with big-/little-endian - matches diverse peripheral interfaces (e.g., 16-bit DSPs, 8-bit microcontrollers) without glue logic.
Four-byte swap modes	No swap, byte swap, word swap, byte-word swap - resolves endianness mismatches across CPU-to-FPGA or processor-to-ASIC links.
Programmable flag offsets	FS0/FS1 select 4, 8, 12, or 16-word AF/AE thresholds - enables precise buffer-level flow control tuned to system latency budgets.
Per-port parity generation/checking	Configurable odd/even parity on A0–A35 and B0–B35 with shared parity trees - adds error detection without external logic or bandwidth penalty.

Applications

Telecom Backplane Interfacing	Multi-Processor Message Passing
Use Scenario: High-speed data exchange between line cards and switch fabric ASICs operating at different clock domains and bus widths. IC Role / Device Role / Timing Role: Dual-clock FIFO bridges CLKA-synchronized ingress processing and CLKB-synchronized egress scheduling, with mailbox registers handling control-plane messages. Use Value: Eliminates clock-domain crossing logic and enables deterministic 67 MHz throughput with 10 ns read latency for packet header parsing.	Use Scenario: Real-time coordination between host CPU and co-processor (e.g., DSP or AI accelerator) sharing memory-mapped I/O space. IC Role / Device Role / Timing Role: Bidirectional FIFO decouples bursty DMA writes from steady-state reads; mailbox registers deliver interrupt commands with guaranteed delivery. Use Value: Prevents bus contention and reduces software polling overhead via MBF1/MBF2 status flags synchronized to respective processor clocks.
Industrial Protocol Gateway	Legacy System Bus Matching
Use Scenario: Bridging Modbus RTU (8-bit serial) and EtherCAT (32-bit parallel) networks in PLC I/O modules. IC Role / Device Role / Timing Role: Port-B configured as 9-bit byte mode with big-endian format receives Modbus frames; Port-A delivers aligned 36-bit packets to EtherCAT controller. Use Value: Hardware-accelerated byte alignment and endianness conversion replaces FPGA logic, reducing gate count and firmware complexity.	Use Scenario: Interfacing 16-bit VMEbus master to 36-bit custom memory controller in avionics data concentrators. IC Role / Device Role / Timing Role: Port-A operates at VMEbus clock rate (e.g., 40 MHz); Port-B runs at memory controller clock (e.g., 67 MHz); bus matching handles width/endianness mismatch. Use Value: Enables drop-in replacement of discrete logic solutions with single-chip timing isolation and programmable flow control.

Telecom Backplane Interfacing

Multi-Processor Message Passing

Use Scenario: High-speed data exchange between line cards and switch fabric ASICs operating at different clock domains and bus widths.

IC Role / Device Role / Timing Role: Dual-clock FIFO bridges CLKA-synchronized ingress processing and CLKB-synchronized egress scheduling, with mailbox registers handling control-plane messages.

Use Value: Eliminates clock-domain crossing logic and enables deterministic 67 MHz throughput with 10 ns read latency for packet header parsing.

Use Scenario: Real-time coordination between host CPU and co-processor (e.g., DSP or AI accelerator) sharing memory-mapped I/O space.

IC Role / Device Role / Timing Role: Bidirectional FIFO decouples bursty DMA writes from steady-state reads; mailbox registers deliver interrupt commands with guaranteed delivery.

Use Value: Prevents bus contention and reduces software polling overhead via MBF1/MBF2 status flags synchronized to respective processor clocks.

Industrial Protocol Gateway

Legacy System Bus Matching

Use Scenario: Bridging Modbus RTU (8-bit serial) and EtherCAT (32-bit parallel) networks in PLC I/O modules.

IC Role / Device Role / Timing Role: Port-B configured as 9-bit byte mode with big-endian format receives Modbus frames; Port-A delivers aligned 36-bit packets to EtherCAT controller.

Use Value: Hardware-accelerated byte alignment and endianness conversion replaces FPGA logic, reducing gate count and firmware complexity.

Use Scenario: Interfacing 16-bit VMEbus master to 36-bit custom memory controller in avionics data concentrators.

IC Role / Device Role / Timing Role: Port-A operates at VMEbus clock rate (e.g., 40 MHz); Port-B runs at memory controller clock (e.g., 67 MHz); bus matching handles width/endianness mismatch.

Use Value: Enables drop-in replacement of discrete logic solutions with single-chip timing isolation and programmable flow control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clocked FIFO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT72V2115L15PF	Single 2K × 18 FIFO, 15 ns access, LVDS-compatible, 100-pin TQFP - lacks dual-clock independence and mailbox registers.	Best for unidirectional, single-domain buffering where cost and footprint are prioritized over flexibility.	Choose IDT72V2115L15PF only if system requires lower pin count, LVDS signaling, and does not need bidirectional async clocking or mailbox bypass.
SN74ABT3614-30PC	Same die, 120-pin PCB package - identical electrical specs but smaller footprint and different thermal profile.	Suitable for space-constrained designs where 132-pin PQ layout is impractical, but requires PCB redesign.	Choose SN74ABT3614-30PC only when board area is critical and thermal dissipation requirements allow thinner package; no functional change.

Compared with IDT72V2115L15PF and SN74ABT3614-30PC, the SN74ABT3614-30PQ uniquely delivers dual independent clock domains, mailbox-bypass capability, and dynamic Port-B bus sizing - making it irreplaceable in heterogeneous multi-processor systems requiring deterministic latency and protocol translation.

Availability

SN74ABT3614-30PQ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol gateways, multi-processor message passing, and legacy bus matching applications requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT3614-30PQ 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 SN74ABT3614-30PQ belongs to TI's advanced BiCMOS FIFO family, engineered for high-speed interprocessor communication in telecom, industrial, and computing systems requiring robust clock-domain bridging and flexible data formatting.

FAQ

What is the maximum supported clock frequency for SN74ABT3614-30PQ?

The SN74ABT3614-30PQ 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 ensures reliable operation with 10 ns read-access time under worst-case conditions. The device maintains timing integrity even when CLKA and CLKB operate asynchronously at this maximum rate.

How does the mailbox-bypass functionality work in SN74ABT3614-30PQ?

The SN74ABT3614-30PQ includes two dedicated 36-bit mailbox registers: mail1 (accessible via Port-B) and mail2 (accessible via Port-A). Writing to mail1 asserts MBF1 low; reading from it via Port-B clears MBF1 high. Similarly, mail2 is written via Port-A and read via Port-B, with MBF2 tracking status. This enables zero-latency command exchange independent of FIFO queuing.

Can SN74ABT3614-30PQ perform byte-order swapping on 18-bit word transfers?

Yes - SN74ABT3614-30PQ supports all four byte-swap modes (no swap, byte swap, word swap, byte-word swap) regardless of Port-B bus size. When configured for 18-bit word transfers using SIZ0/SIZ1, SW0/SW1 still select the swap behavior applied to the active 18-bit segment, preserving correct endianness alignment for DSP or microcontroller interfaces.

What is the purpose of the FS0 and FS1 pins on SN74ABT3614-30PQ?

FS0 and FS1 are flag offset select inputs that configure the programmable almost-full (AFA/AFB) and almost-empty (AEA/AEB) thresholds. On the rising edge of RST, their logic levels load one of four preset values (4, 8, 12, or 16 words) into the internal offset register X - enabling precise flow-control tuning without firmware intervention.

Does SN74ABT3614-30PQ require power-on reset sequencing?

Yes - SN74ABT3614-30PQ must be reset after power-up using the RST pin. A valid reset requires at least four low-to-high transitions on both CLKA and CLKB while RST is held low. This initializes all FIFO pointers, sets flag states (FFA/FFB low, AFA/AFB high), and loads the FS0/FS1-selected offset value. Failure to execute this sequence results in undefined flag behavior and unreliable data transfer.

SN74ABT3614-30PQ 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:: 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:: 132-BQFP (24.13x24.13)

SN74ABT3614-30PQ FAQ

1.How can I place an order for SN74ABT3614-30PQ through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT3614-30PQ 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 SN74ABT3614-30PQ reliable?

The price and inventory of SN74ABT3614-30PQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3614-30PQ is usually 5 days.

3.What payment methods are accepted for SN74ABT3614-30PQ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT3614-30PQ transactions.

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4.How is shipping managed for SN74ABT3614-30PQ?

SN74ABT3614-30PQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT3614-30PQ 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 SN74ABT3614-30PQ?

For technical support, including SN74ABT3614-30PQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3614-30PQ requirements.

6.How does Aetrix verify that SN74ABT3614-30PQ is sourced from the original manufacturer or authorized distributors?

All SN74ABT3614-30PQ 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 SN74ABT3614-30PQ meets industry standards.

7.What is the process for return or replacement of SN74ABT3614-30PQ?

All SN74ABT3614-30PQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3614-30PQ, 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 SN74ABT3614-30PQ part is unused and in its original packaging.

Return procedure for SN74ABT3614-30PQ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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