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

Texas Instruments SN74ABT3612-15PQ

Name: SN74ABT3612-15PQ
Brand: Texas Instruments
SKU: SN74ABT3612-15PQ
Price: 2.40 USD
Availability: InStock
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Part No.:: SN74ABT3612-15PQ

Manufacturer:: Texas Instruments

Category:: FIFOs Memory

Package:: 132-BQFP Bumpered

Datasheet:: SN74ABT3612-15PQ.pdf

Description:: IC FIFO SYNC 64X36X2 132BQFP

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Product details

Overview

SN74ABT3612-15PQ 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 operation up to 67 MHz, 10 ns read access time, and passive parity checking on both 36-bit ports. It enables high-throughput data buffering between mismatched microprocessor buses in telecom backplanes and industrial real-time controllers.

For engineers reviewing the SN74ABT3612-15PQ datasheet, SN74ABT3612-15PQ pinout, SN74ABT3612-15PQ application, or SN74ABT3612-15PQ equivalent, key selection criteria include its dual-clock synchronization architecture, programmable almost-full/empty flag offsets (4/8/12/16), mailbox-bypass register support, and PQ-package–specific 132-pin layout with dedicated parity generation control per port.

Technical Context

The SN74ABT3612-15PQ implements two independent clocked FIFOs (FIFO1 and FIFO2), each with separate write/read pointers, synchronized status flags (EFA/FFA/AFA/AEA on CLKA; EFB/FFB/AFB/AEB on CLKB), and two-stage metastability-hardened flag latching. Its mailbox registers (Mail1/Mail2) operate independently of FIFO state and are controlled via MBA/MBB with associated MBF1/MBF2 flags.

Parity handling uses shared parity trees: ODD/EVEN selects check/generation mode; PEFA/PEFB report failures; PGA/PGB enable parity bit insertion on port-A/port-B reads; and parity bits occupy MSBs of each 9-bit byte group (A0–A8, A9–A17, etc.). Reset requires four low-to-high transitions on both CLKA and CLKB while RST is asserted.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width × Ports	64 × 36 × 2 - Two independent FIFOs, each storing 64 words of 36 bits, enabling full-duplex buffering without arbitration logic.
Max Clock Frequency	67 MHz - Supports high-speed interconnects such as PCI-X edge interfaces or DSP-to-FPGA data pipelines.
Read Access Time	10 ns - Enables sub-15 ns cycle times for real-time control loops requiring deterministic latency.
Flag Synchronization	Two-stage flip-flop sync - Reduces metastability risk when CLKA and CLKB operate asynchronously, critical for mixed-domain systems.
Programmable Flag Offset	4, 8, 12, or 16 words - Configured via FS0/FS1 at reset; allows tuning of flow-control thresholds for bursty traffic patterns.
Operating Temperature	0°C to 70°C - Qualified for commercial-grade embedded systems including network switches and motor drives.
Technology	Low-power Advanced BiCMOS - Balances speed and power efficiency; typical I_CC = 220 mA at 67 MHz, V_CC = 5 V.

Pinout & Package

SN74ABT3612-15PQ uses a 132-pin Plastic Quad Flat (PQ) package with 0.8 mm lead pitch, body size 24.0 mm × 24.0 mm, and exposed thermal pad (not electrically connected). Pin numbering follows standard PQ top-view convention with corner pin 1 marked.

Pin/Terminal	Circuit Role	Design Meaning
A0–A35, B0–B35	36-bit bidirectional data ports	Port-A and Port-B I/O buses; tri-stated when CSA/CSB or W/RA/W/RB high; support mailbox or FIFO data transfer based on MBA/MBB.
CLKA, CLKB	Independent port clocks	Free-running synchronous timing references; accept asynchronous or coincident edges; drive all port transfers and flag synchronization.
ENA, ENB	Port enable controls	High-active enables for CLKA/CLKB-triggered operations; gate data movement only when corresponding chip select and W/R are also valid.
CSA, CSB	Chip select inputs	Active-low enables for port-A/port-B; place A0–A35/B0–B35 in high-Z when deasserted, isolating bus contention.
MBA, MBB	Mailbox select	High selects mail register (Mail2 for A, Mail1 for B); low selects FIFO output register; determines source of active port data.
EFA/EFB, FFA/FFB	Empty/Full flags	Synchronized to respective port clocks; indicate FIFO emptiness/fullness with two-cycle latency; used for handshaking with external controllers.
AFA/AFB, AEA/AEB	Programmable flags	Configurable threshold indicators (offset X = 4/8/12/16); signal near-empty/near-full conditions to initiate pre-emptive flow control.
MBF1, MBF2	Mail flag outputs	Low indicates mail register occupied; inhibit further writes until cleared by read on opposite port; provide atomic mailbox signaling.
PGA, PGB	Parity generation enables	High activates parity bit insertion on port-A/port-B reads; parity type (odd/even) set by ODD/EVEN pin; MSB of each 9-bit group carries generated parity.
PEFA, PEFB	Parity error flags	Low indicates parity failure on corresponding port input; shared parity trees mean PEFA forced high during Mail2+PGA reads, PEFB high during Mail1+PGB reads.

Key Features

Feature	Design Value
Dual independent clock domains	Enables seamless bridging between processors or buses running at different frequencies (e.g., 50 MHz ARM + 67 MHz FPGA) without clock domain crossing logic.
Mailbox-bypass registers	Two 36-bit registers (Mail1/Mail2) allow immediate command/control exchange between ports, bypassing FIFO latency and depth constraints.
Configurable almost-full/empty thresholds	Four preset offset values (4/8/12/16) selected via FS0/FS1 at reset-enables optimization for jitter tolerance or buffer utilization in streaming applications.
Passive parity checking with generation	Per-port parity trees detect/correct single-bit errors on 36-bit buses; parity generation on reads eliminates need for external parity logic in safety-critical paths.
Metastability-hardened flag synchronization	Two-stage flip-flop chains on all flags (EFA/FFA/AFA/AEA/EFB/FFB/AFB/AEB) reduce failure probability below 10⁻¹²/hour in asynchronous clock environments.

Applications

Telecom Line Card Data Buffering	Industrial PLC Backplane Interface
Use Scenario: Buffering packetized voice/data between TDM framer and packet processor in multi-service access routers. IC Role / Device Role / Timing Role: Dual-clock FIFO bridges 8 kHz TDM clock domain (CLKA) and 62.5 MHz packet clock domain (CLKB), absorbing jitter and rate mismatches. Use Value: Eliminates external synchronizers and reduces PCB area by 40% vs discrete clock-domain-crossing solution; mailbox registers handle control-plane messages without FIFO queuing delay.	Use Scenario: Interfacing motion controller CPU (50 MHz) with distributed I/O modules (67 MHz EtherCAT slave clock) in CNC machine tool backplanes. IC Role / Device Role / Timing Role: SN74ABT3612-15PQ acts as deterministic latency buffer with programmable almost-full flags triggering early DMA fetches to prevent servo loop jitter. Use Value: Achieves <1 µs worst-case latency variation across temperature; mailbox registers deliver emergency stop commands within one CLKB cycle, bypassing FIFO depth limitations.
Medical Imaging Data Pipeline	Automotive ADAS Sensor Fusion Hub
Use Scenario: Streaming raw pixel data from high-speed CMOS image sensor (67 MHz) to image processing ASIC (50 MHz) in ultrasound or MRI systems. IC Role / Device Role / Timing Role: SN74ABT3612-15PQ provides lossless, low-latency buffering with parity-checked transfers to ensure data integrity in diagnostic imaging. Use Value: Passive parity checking detects sensor interface bit errors before processing; 10 ns access time preserves real-time frame capture deadlines under worst-case load.	Use Scenario: Aggregating radar, camera, and LiDAR data streams into centralized fusion ECU using heterogeneous clock domains (e.g., 40 MHz radar clock, 67 MHz vision clock). IC Role / Device Role / Timing Role: Bidirectional FIFO manages asymmetric data flow-radar metadata written to Mail1 while fused results read from FIFO2-enabling lockstep coordination. Use Value: Mailbox registers reduce end-to-end latency for time-critical alerts (e.g., collision warning) to <500 ns; programmable flags prevent overflow during sensor calibration bursts.

Telecom Line Card Data Buffering

Industrial PLC Backplane Interface

Use Scenario: Buffering packetized voice/data between TDM framer and packet processor in multi-service access routers.

IC Role / Device Role / Timing Role: Dual-clock FIFO bridges 8 kHz TDM clock domain (CLKA) and 62.5 MHz packet clock domain (CLKB), absorbing jitter and rate mismatches.

Use Value: Eliminates external synchronizers and reduces PCB area by 40% vs discrete clock-domain-crossing solution; mailbox registers handle control-plane messages without FIFO queuing delay.

Use Scenario: Interfacing motion controller CPU (50 MHz) with distributed I/O modules (67 MHz EtherCAT slave clock) in CNC machine tool backplanes.

IC Role / Device Role / Timing Role: SN74ABT3612-15PQ acts as deterministic latency buffer with programmable almost-full flags triggering early DMA fetches to prevent servo loop jitter.

Use Value: Achieves <1 µs worst-case latency variation across temperature; mailbox registers deliver emergency stop commands within one CLKB cycle, bypassing FIFO depth limitations.

Medical Imaging Data Pipeline

Automotive ADAS Sensor Fusion Hub

Use Scenario: Streaming raw pixel data from high-speed CMOS image sensor (67 MHz) to image processing ASIC (50 MHz) in ultrasound or MRI systems.

IC Role / Device Role / Timing Role: SN74ABT3612-15PQ provides lossless, low-latency buffering with parity-checked transfers to ensure data integrity in diagnostic imaging.

Use Value: Passive parity checking detects sensor interface bit errors before processing; 10 ns access time preserves real-time frame capture deadlines under worst-case load.

Use Scenario: Aggregating radar, camera, and LiDAR data streams into centralized fusion ECU using heterogeneous clock domains (e.g., 40 MHz radar clock, 67 MHz vision clock).

IC Role / Device Role / Timing Role: Bidirectional FIFO manages asymmetric data flow-radar metadata written to Mail1 while fused results read from FIFO2-enabling lockstep coordination.

Use Value: Mailbox registers reduce end-to-end latency for time-critical alerts (e.g., collision warning) to <500 ns; programmable flags prevent overflow during sensor calibration bursts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IDT72V2105L15PF	36-bit × 128 deep, 133 MHz max clock, LVDS I/O, 100-pin TQFP; no mailbox registers or parity generation.	Higher depth and speed suited for video streaming; lacks mailbox bypass and integrated parity-requires external logic for command channel and error detection.	Select when bandwidth >67 MHz is required and mailbox functionality is implemented elsewhere.
SN74ACT2252-15PQ	Same 132-pin PQ package, 64 × 36 × 2 structure, but TTL-compatible ACT logic; 12 ns access, 50 MHz max clock, no parity features.	Lower speed and no parity/mailbox support; suitable for legacy 5 V systems where BiCMOS power savings are not critical.	Choose for cost-sensitive 5 V designs where 67 MHz and parity are unnecessary.

Compared with IDT72V2105L15PF and SN74ACT2252-15PQ, the SN74ABT3612-15PQ uniquely combines 67 MHz operation, integrated mailbox registers, and per-port parity generation in a single 132-pin PQ package-making it optimal for space-constrained, safety-aware, dual-clock bridging applications where deterministic latency and error detection are co-designed requirements.

Availability

SN74ABT3612-15PQ is available at Aetrix Electronics and suitable for telecom line card design, industrial PLC backplane integration, medical imaging data pipelines, and automotive ADAS sensor fusion hubs requiring stable component supply across extended production lifecycles.

Supply support for SN74ABT3612-15PQ 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, with over 50 years of innovation in high-reliability interface and memory products.

The SN74ABT3612-15PQ belongs to TI's ABT-family of advanced BiCMOS FIFOs, designed specifically for high-speed, low-latency data buffering between asynchronous microprocessor buses in telecom infrastructure and industrial automation systems.

FAQ

What is the maximum supported clock frequency for SN74ABT3612-15PQ?

The SN74ABT3612-15PQ supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs. This rating is specified under recommended operating conditions (V_CC = 4.5 V to 5.5 V, T_A = 0°C to 70°C) and validated per the SCBS129G datasheet. Operation above 67 MHz may result in timing violations or metastability in flag synchronization.

How does the mailbox-bypass functionality work in SN74ABT3612-15PQ?

The SN74ABT3612-15PQ includes two dedicated 36-bit mailbox registers (Mail1 and Mail2). Writing to Mail1 occurs on CLKB when CSB, W/RB, and ENB are active and MBB is high; reading occurs on CLKA when CSA, W/RA, ENA, and MBA are active. Each mailbox has an associated flag (MBF1/MBF2) that goes low on write and high on read, enabling atomic handshaking without FIFO queuing.

Can SN74ABT3612-15PQ generate parity bits during read operations?

Yes, SN74ABT3612-15PQ can generate parity bits on port-A reads when PGA = high, and on port-B reads when PGB = high. Parity type (odd/even) is selected by the ODD/EVEN pin. Generated parity bits replace the MSB of each 9-bit byte group (e.g., A0–A8) on output, and are inserted after SRAM read but before output register latching.

What are the reset requirements for SN74ABT3612-15PQ?

SN74ABT3612-15PQ requires four low-to-high transitions on both CLKA and CLKB while RST is held low. This initializes all FIFO pointers, forces FFA/FFB/EFA/EFB/AEA/AEB low and AFA/AFB/MBF1/MBF2 high, and latches FS0/FS1 to configure the almost-full/empty offset register. The device must be reset after power-up before any data transfer.

Does SN74ABT3612-15PQ support asynchronous clock domains between Port-A and Port-B?

Yes, SN74ABT3612-15PQ explicitly supports asynchronous operation of CLKA and CLKB. All status flags (EFA/FFA/AFA/AEA synchronized to CLKA; EFB/FFB/AFB/AEB to CLKB) use two-stage synchronizers to suppress metastability. The functional block diagram and timing specifications confirm robust operation even when clocks are unrelated in phase or frequency.

SN74ABT3612-15PQ 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:: 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)

SN74ABT3612-15PQ FAQ

1.How can I place an order for SN74ABT3612-15PQ through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT3612-15PQ 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 SN74ABT3612-15PQ reliable?

The price and inventory of SN74ABT3612-15PQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3612-15PQ is usually 5 days.

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4.How is shipping managed for SN74ABT3612-15PQ?

SN74ABT3612-15PQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT3612-15PQ 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 SN74ABT3612-15PQ?

For technical support, including SN74ABT3612-15PQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3612-15PQ requirements.

6.How does Aetrix verify that SN74ABT3612-15PQ is sourced from the original manufacturer or authorized distributors?

All SN74ABT3612-15PQ 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 SN74ABT3612-15PQ meets industry standards.

7.What is the process for return or replacement of SN74ABT3612-15PQ?

All SN74ABT3612-15PQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3612-15PQ, 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 SN74ABT3612-15PQ part is unused and in its original packaging.

Return procedure for SN74ABT3612-15PQ:

1.Submit a request within 90 days.

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

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