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

Texas Instruments SN74ABT3614-20PCB

Name: SN74ABT3614-20PCB
Brand: Texas Instruments
SKU: SN74ABT3614-20PCB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT3614-20PCB

Manufacturer:: Texas Instruments

Category:: FIFOs Memory

Package:: 120-LQFP

Datasheet:: SN74ABT3614-20PCB.pdf

Description:: IC FIFO SYNC 64X36X2 120HLQFP

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Product details

Overview

SN74ABT3614-20PCB 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 data bridging between mismatched microprocessor buses in telecom switching systems.

For engineers reviewing the SN74ABT3614-20PCB datasheet, SN74ABT3614-20PCB pinout, SN74ABT3614-20PCB application, or SN74ABT3614-20PCB equivalent, key selection considerations include its dual-clock synchronization architecture, mailbox-bypass register support for DMA initialization, programmable almost-full/empty flags with offset register, passive parity checking per port, and PCB-package-specific timing compliance at 67 MHz.

Technical Context

The SN74ABT3614-20PCB implements two independent 64-word × 36-bit clocked FIFOs with fully synchronous, edge-triggered interfaces on both ports. Each port uses separate free-running clocks (CLKA/CLKB), with all status flags (EFA/FFA/AEA/AFA and EFB/FFB/AEB/AFB) two-stage synchronized to their respective write/read clocks to suppress metastability.

Port-B supports dynamic bus sizing via SIZ0/SIZ1 latched on CLKB edges, enabling real-time reconfiguration between 36-bit long word, 18-bit word, and 9-bit byte transfers - each configurable for big-endian (BE low) or little-endian (BE high) alignment and one of four byte-swap modes (SW0/SW1).

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 directional isolation.
Max Clock Frequency	67 MHz - supports high-throughput interconnect between 66 MHz PCI and 50 MHz DSP buses without external clock domain crossing logic.
Read Access Time	10 ns - guarantees sub-15 ns latency for FIFO output register reads under worst-case commercial temperature (0°C to 70°C).
Bus Sizing Options	Port-B dynamically configurable as 36-bit (long word), 18-bit (word), or 9-bit (byte) - eliminates need for external multiplexers in mixed-width peripheral interfacing.
Flag Synchronization	All status flags two-stage synchronized to respective port clock - reduces metastability risk below 10⁻⁹ failures/hour when CLKA and CLKB operate asynchronously.
Operating Temperature	0°C to 70°C - qualified for commercial-grade embedded networking equipment with no derating required up to 70°C ambient.
Parity Support	Passive parity checking on both ports with selectable odd/even mode (ODD/EVEN input); optional parity generation on read (PGA/PGB) - enables end-to-end data integrity verification in backplane applications.

Pinout & Package

SN74ABT3614-20PCB is housed in 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 convention (pin 1 at top-left corner, counterclockwise).

Pin/Terminal	Circuit Role	Design Meaning
A0–A35	Port-A bidirectional data bus	36-bit parallel 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 parallel interface for FIFO1 read/write and mail1 register access; bus size dynamically reduced to 18/9 bits via SIZ0/SIZ1.
CLKA / CLKB	Free-running port clocks	Independent synchronous timing references; all port operations (data transfer, flag updates, pointer increments) edge-triggered on low-to-high transition.
CSA / CSB	Port chip select inputs	Active-low enables; disables port I/O and forces data pins to high-Z when deasserted - essential for bus sharing in multi-device systems.
W/RA / W/RB	Port write/read direction control	High = write to FIFO/mailbox; low = read from FIFO/mailbox; determines A0–A35/B0–B35 driver state during active cycle.
EFA / EFB	Port-A/B empty flags	Synchronized to CLKA/CLKB; low indicates FIFO2/FIFO1 is empty and further reads are ignored - prevents underrun in streaming protocols.
FFA / FFB	Port-A/B full flags	Synchronized to CLKA/CLKB; low indicates FIFO1/FIFO2 is full and further writes are ignored - prevents overrun in burst-mode transfers.
AFA / AFB	Port-A/B almost-full flags	Programmable (FS0/FS1) and synchronized; low when FIFO contains ≥(64−X) words - triggers early flow control before full condition occurs.
AEA / AEB	Port-A/B almost-empty flags	Programmable (FS0/FS1) and synchronized; low when FIFO contains ≤X words - signals host processor to preload next data block.
MBF1 / MBF2	Mailbox full flags	Low indicates mail1/mail2 register holds valid data; self-clearing on corresponding port read - enables handshake-free command passing.
SIZ0 / SIZ1 / BE	Port-B bus configuration	Latched on CLKB edge; selects 36/18/9-bit width and MSB/LSB alignment - allows runtime adaptation to peripheral bus width changes.
SW0 / SW1	Port-B byte-swap mode	Selects no swap, byte swap, word swap, or byte-word swap at start of long-word transfer - resolves endianness mismatches without software overhead.

Key Features

Feature	Design Value
Dual independent clock domains	Enables asynchronous data transfer between 66 MHz CPU bus and 40 MHz network controller without external synchronizers or FIFO depth penalties.
Mailbox-bypass registers	Two 36-bit dedicated registers (mail1/mail2) with flag signaling allow immediate command/control exchange - cuts DMA setup latency by >3× vs. FIFO-based initialization.
Programmable AF/AE offset	Four preset thresholds (4/8/12/16 words) set via FS0/FS1 at reset - permits fine-grained flow control tuning for varying packet sizes in ATM cell relay.
Dynamic port-B bus sizing	Hardware-reconfigurable 36/18/9-bit interface synchronized to CLKB - eliminates need for glue logic when connecting to 8-bit UARTs, 16-bit peripherals, or 32-bit processors.
Endianness and byte-swapping	Big/little-endian selection (BE) + four swap modes (SW0/SW1) applied per long-word transfer - resolves native byte order mismatches in heterogeneous SoC interconnects.

Applications

Telecom Switch Fabric Interface	PCI-to-DSP Bridge
Use Scenario: Interfacing line cards with different clock domains and data widths in modular telecom switches. IC Role / Device Role / Timing Role: Bidirectional FIFO buffer with independent CLKA/CLKB clocks and mailbox registers for control message passing. Use Value: Eliminates external clock domain crossing logic and reduces control-plane latency by using mail2 register to deliver configuration commands within one CLKA cycle.	Use Scenario: Connecting a 32-bit 33 MHz PCI bus to a 16-bit 50 MHz DSP in a radar signal processing module. IC Role / Device Role / Timing Role: Port-A (32-bit emulated via A0–A31) handles PCI writes; Port-B dynamically sized to 16-bit word mode with little-endian alignment for DSP interface. Use Value: Dynamic bus sizing and byte swapping avoid FPGA-based width conversion logic, reducing BOM cost and routing complexity on dense DSP carrier boards.
Backplane Data Concentrator	Industrial Protocol Gateway
Use Scenario: Aggregating sensor data streams from multiple 8-bit RS-485 nodes into a 36-bit parallel backplane bus. IC Role / Device Role / Timing Role: Port-B configured as 9-bit byte mode with big-endian alignment to receive serialized sensor frames; Port-A outputs full 36-bit words to backplane. Use Value: Hardware byte packing and parity generation (PGB enabled) ensure bit-level integrity across noisy industrial environments without CPU intervention.	Use Scenario: Translating Modbus RTU (8-bit) to EtherCAT (32-bit) in a factory automation gateway. IC Role / Device Role / Timing Role: Dual FIFOs isolate protocol stacks; mailbox registers pass parsed command headers between ARM Cortex-M4 and FPGA-based EtherCAT master. Use Value: Two-stage synchronized flags prevent metastability-induced frame loss during high-speed EtherCAT cyclic data exchange at 100 Mbps line rate.

Telecom Switch Fabric Interface

PCI-to-DSP Bridge

Use Scenario: Interfacing line cards with different clock domains and data widths in modular telecom switches.

IC Role / Device Role / Timing Role: Bidirectional FIFO buffer with independent CLKA/CLKB clocks and mailbox registers for control message passing.

Use Value: Eliminates external clock domain crossing logic and reduces control-plane latency by using mail2 register to deliver configuration commands within one CLKA cycle.

Use Scenario: Connecting a 32-bit 33 MHz PCI bus to a 16-bit 50 MHz DSP in a radar signal processing module.

IC Role / Device Role / Timing Role: Port-A (32-bit emulated via A0–A31) handles PCI writes; Port-B dynamically sized to 16-bit word mode with little-endian alignment for DSP interface.

Use Value: Dynamic bus sizing and byte swapping avoid FPGA-based width conversion logic, reducing BOM cost and routing complexity on dense DSP carrier boards.

Backplane Data Concentrator

Industrial Protocol Gateway

Use Scenario: Aggregating sensor data streams from multiple 8-bit RS-485 nodes into a 36-bit parallel backplane bus.

IC Role / Device Role / Timing Role: Port-B configured as 9-bit byte mode with big-endian alignment to receive serialized sensor frames; Port-A outputs full 36-bit words to backplane.

Use Value: Hardware byte packing and parity generation (PGB enabled) ensure bit-level integrity across noisy industrial environments without CPU intervention.

Use Scenario: Translating Modbus RTU (8-bit) to EtherCAT (32-bit) in a factory automation gateway.

IC Role / Device Role / Timing Role: Dual FIFOs isolate protocol stacks; mailbox registers pass parsed command headers between ARM Cortex-M4 and FPGA-based EtherCAT master.

Use Value: Two-stage synchronized flags prevent metastability-induced frame loss during high-speed EtherCAT cyclic data exchange at 100 Mbps line rate.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT72V2115L10PF	Single 2,048 × 18-bit FIFO; 10 ns access; 100 MHz max clock; no mailbox registers or byte-swapping.	Supports higher bandwidth but lacks dual-clock independence and bus-matching features - requires external logic for endian conversion.	Choose when system uses matched clock domains and only needs single-direction buffering with higher density.
ICS650-03CDLFT	64 × 36 × 2 FIFO; 8 ns access; 80 MHz max clock; no dynamic bus sizing or programmable AF/AE offsets.	Offers faster timing but omits SIZ0/SIZ1, BE, SW0/SW1 controls - cannot adapt to variable peripheral bus widths at runtime.	Prefer when maximum throughput is critical and all connected peripherals use fixed 36-bit interfaces.

Compared with IDT72V2115L10PF and ICS650-03CDLFT, SN74ABT3614-20PCB uniquely combines dual independent clocks, hardware mailbox bypass, and runtime bus-sizing - making it irreplaceable in heterogeneous, multi-standard interconnect where clock domain isolation and interface flexibility are mandatory.

Availability

SN74ABT3614-20PCB is available at Aetrix Electronics and suitable for telecom switch fabric design, PCI-to-DSP bridging, and industrial protocol gateway development requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74ABT3614-20PCB 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-speed interface ICs.

The SN74ABT3614-20PCB belongs to TI's advanced BiCMOS FIFO memory family, engineered specifically for clock-domain bridging in telecom infrastructure, data concentrators, and real-time protocol gateways where deterministic latency and bus-matching flexibility are critical.

FAQ

What is the maximum supported clock frequency for SN74ABT3614-20PCB?

The SN74ABT3614-20PCB supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs under commercial temperature conditions (0°C to 70°C). This rating is validated per the SCBS126H datasheet revision April 2000 and applies specifically to the PCB package variant with 10 ns read-access timing.

Does SN74ABT3614-20PCB support asynchronous operation between CLKA and CLKB?

Yes, SN74ABT3614-20PCB explicitly supports asynchronous or coincident CLKA and CLKB operation. All status flags (EFA/FFA/AEA/AFA and EFB/FFB/AEB/AFB) are two-stage synchronized to their respective port clocks to ensure reliable metastability suppression when clocks run independently.

How does the mailbox-bypass functionality work in SN74ABT3614-20PCB?

SN74ABT3614-20PCB includes two dedicated 36-bit mailbox registers (mail1 and mail2). Writing to mail1 is triggered by CLKB edge when CSB/W/RB/ENB active and SIZ0=SIZ1=high; reading from mail2 is selected via MBA high during port-A read. Each mailbox has a flag (MBF1/MBF2) that goes low on write and high on corresponding port read - enabling zero-software-handshake command passing.

Can SN74ABT3614-20PCB perform byte-order swapping on Port-B for non-36-bit transfers?

Yes, SN74ABT3614-20PCB supports byte-order swapping (via SW0/SW1) on Port-B for all bus sizes - including 18-bit word and 9-bit byte configurations. The swap mode is applied at the start of each long-word transfer and remains active regardless of current SIZ0/SIZ1 setting, ensuring consistent endianness handling across variable-width operations.

What is the function of the ODD/EVEN pin on SN74ABT3614-20PCB?

The ODD/EVEN pin on SN74ABT3614-20PCB selects parity type for both passive checking and active generation: high = odd parity, low = even parity. It controls parity validation on incoming A0–A35 and B0–B35 bytes (organized as four 9-bit groups), and determines parity bit value when PGA or PGB is asserted for outgoing data reads.

SN74ABT3614-20PCB 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:: 50MHz

Access Time:: 12ns

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)

SN74ABT3614-20PCB FAQ

1.How can I place an order for SN74ABT3614-20PCB through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT3614-20PCB 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 SN74ABT3614-20PCB reliable?

The price and inventory of SN74ABT3614-20PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3614-20PCB is usually 5 days.

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SN74ABT3614-20PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT3614-20PCB 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 SN74ABT3614-20PCB?

For technical support, including SN74ABT3614-20PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3614-20PCB requirements.

6.How does Aetrix verify that SN74ABT3614-20PCB is sourced from the original manufacturer or authorized distributors?

All SN74ABT3614-20PCB 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 SN74ABT3614-20PCB meets industry standards.

7.What is the process for return or replacement of SN74ABT3614-20PCB?

All SN74ABT3614-20PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3614-20PCB, 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 SN74ABT3614-20PCB part is unused and in its original packaging.

Return procedure for SN74ABT3614-20PCB:

1.Submit a request within 90 days.

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

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