Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Texas Instruments SN74ACT3632-20PCB

Name: SN74ACT3632-20PCB
Brand: Texas Instruments
SKU: SN74ACT3632-20PCB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74ACT3632-20PCB

Manufacturer:: Texas Instruments

Category:: FIFOs Memory

Package:: 120-LQFP

Datasheet:: SN74ACT3632-20PCB.pdf

Description:: IC FIFO SYNC 512X36X2 120HLQFP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,815

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74ACT3632-20PCB from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 512 × 36 SRAM FIFOs, supporting asynchronous or coincident CLKA/CLKB up to 67 MHz, 11 ns access time, and programmable almost-full/empty flags synchronized per port. It enables high-speed data buffering between microprocessor buses operating at different clock domains.

For engineers reviewing the SN74ACT3632-20PCB datasheet, SN74ACT3632-20PCB pinout, SN74ACT3632-20PCB application, or SN74ACT3632-20PCB equivalent, key selection considerations include dual-port flag synchronization timing, mailbox-bypass register usage, FIFO reset sequencing, and PCB-package pin compatibility with SN74ACT3622/SN74ACT3642.

Technical Context

This device implements two fully independent, clock-synchronized 512-word × 36-bit FIFOs (FIFO1 and FIFO2), each with separate write/read pointers, input-ready (IRA/IRB) and output-ready (ORA/ORB) flags, and programmable almost-empty (AEA/AEB) and almost-full (AFA/AFB) flags. All flags are two-stage synchronized to their respective port clocks (CLKA for A-side, CLKB for B-side) to suppress metastability in asynchronous clock domain crossings.

Each FIFO includes a dedicated 36-bit mailbox register (Mail1/Mail2) with handshake flags (MBF1/MBF2), enabling immediate command/control transfer without queuing. Flag offset registers (X1/X2/Y1/Y2) are programmable via port-A writes or preset during reset using FS0/FS1 latching, supporting flexible buffer management in real-time systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width × Ports	512 × 36 × 2 - Two independent dual-port FIFOs, each storing 512 words of 36-bit data with full read/write isolation.
Max Clock Frequency	67 MHz - Enables high-throughput bridging between fast microprocessors or DSPs without cycle-stretching.
Read Access Time	11 ns - Guarantees sub-15 ns latency from clock edge to valid output data, critical for tight-timing control loops.
Technology	Low-power 0.8-µm Advanced CMOS - Delivers TTL-compatible drive strength with reduced static/dynamic power vs. bipolar FIFOs.
Operating Temperature	0°C to 70°C - Qualified for commercial-grade embedded systems, industrial controllers, and communications equipment.
Flag Synchronization	Two-stage flip-flop sync per port - Eliminates metastability risk when CLKA and CLKB operate asynchronously.
Mailbox Functionality	Dedicated 36-bit Mail1/Mail2 registers with MBF1/MBF2 flags - Provides non-blocking command channel alongside FIFO data path.

Pinout & Package

SN74ACT3632-20PCB 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, clocks, controls, power/ground).

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; high-impedance when CSB or W/RB low.
CLKA, CLKB	Independent port clocks	Continuous synchronous clocks; all A-side transfers gated to CLKA↑, all B-side to CLKB↑; support async or coincident operation.
CSA, CSB	Chip select inputs	Active-low enables; disable port I/O and place data lines in high-Z when deasserted.
W/RA, W/RB	Port-A/B write/read select	W/RA high = write to FIFO1/Mail1; W/RB low = write to FIFO2/Mail2; polarity inverted between ports for symmetric control logic.
ENA, ENB	Port enable inputs	High enables clock-gated transfers; required with CSA/CSB and W/RA/W/RB to activate read/write cycles.
IRA, ORA, AFA, AEA	Port-A status flags	Synchronized to CLKA: IRA (input-ready), ORA (output-ready), AFA (almost-full), AEA (almost-empty); indicate FIFO1 fill state.
IRB, ORB, AFB, AEB	Port-B status flags	Synchronized to CLKB: IRB (input-ready), ORB (output-ready), AFB (almost-full), AEB (almost-empty); indicate FIFO2 fill state.
MBA, MBB	Mailbox select inputs	High selects Mail2 (A-side) or Mail1 (B-side); low selects FIFO2 or FIFO1 output register for data reads.
MBF1, MBF2	Mailbox flag outputs	MBF1 low = Mail1 full; MBF2 low = Mail2 full; self-clearing on corresponding port read with mailbox select asserted.
RST1, RST2	FIFO reset inputs	Asynchronous active-high resets; require ≥4 CLKA+CLKB transitions while low; latch FS0/FS1 to configure flag offsets.
FS0, FS1	Flag offset select inputs	Latched on RST1↑/RST2↑ rising edge to select preset values (8/16/64) or enable port-A programming of X1/X2/Y1/Y2 registers.

Key Features

Feature	Design Value
Dual independent FIFOs	Enables simultaneous bidirectional data flow between mismatched clock domains without arbitration logic or shared memory contention.
Programmable almost-full/empty flags	Four offset registers (X1/X2/Y1/Y2) allow dynamic threshold tuning for flow control-e.g., trigger DMA reload at 448 words (512−64) to prevent underflow.
Mailbox-bypass registers	Two 36-bit registers (Mail1/Mail2) with dedicated flags (MBF1/MBF2) provide zero-latency command channel parallel to FIFO data path.
Metastability-hardened flag synchronization	Two-stage synchronizers on all status flags eliminate setup/hold violations across asynchronous CLKA/CLKB boundaries per JEDEC JESD8-12.
Microprocessor interface logic	Integrated CSA/CSB, W/RA/W/RB, ENA/ENB decoding supports direct connection to 80Cxx/68K-style buses without external glue logic.

Applications

Industrial PLC Backplane Bridge	DSP-to-Microcontroller Data Interface
Use Scenario: Bridging real-time I/O scan cycles (10 kHz) from a fieldbus controller to a slower HMI processor (1 MHz bus). IC Role / Device Role / Timing Role: SN74ACT3632-20PCB acts as a clock-domain crossing FIFO, absorbing jitter and burst traffic between deterministic and variable-latency subsystems. Use Value: Prevents data loss during bus arbitration delays; 512-word depth absorbs >50 ms of worst-case scan bursts at 10 kHz.	Use Scenario: Streaming sensor fusion results from a C67x DSP to an ARM-based host running Linux, with strict timing deadlines for motion control. IC Role / Device Role / Timing Role: SN74ACT3632-20PCB serves as a decoupled data buffer, isolating DSP's 100 MHz clock domain from ARM's 200 MHz AXI bus. Use Value: 11 ns access time ensures sub-microsecond response to DMA requests; mailbox registers deliver urgent interrupt commands without FIFO queuing delay.
Telecom Line Card Inter-Processor Link	Automotive ADAS Sensor Aggregation
Use Scenario: Connecting a framer ASIC (62.5 MHz) to a packet processor (125 MHz) in a multi-service access router line card. IC Role / Device Role / Timing Role: SN74ACT3632-20PCB provides bidirectional buffering with independent flag sets, allowing full-duplex HDLC frame exchange across clock domains. Use Value: Programmable AFA/AEB thresholds enable adaptive flow control matching link-layer protocol overhead; 67 MHz clock support matches OC-3 timing budgets.	Use Scenario: Aggregating raw camera, radar, and ultrasonic data streams into a central domain controller for autonomous driving decision logic. IC Role / Device Role / Timing Role: SN74ACT3632-20PCB functions as a safety-critical data concentrator FIFO, with mailbox registers delivering ASIL-B-compliant fault alerts. Use Value: Dual FIFO architecture allows concurrent ingestion of 36-bit radar frames and emission of 36-bit fused object lists; two-stage flag sync meets ISO 26262 timing analysis requirements.

Industrial PLC Backplane Bridge

DSP-to-Microcontroller Data Interface

Use Scenario: Bridging real-time I/O scan cycles (10 kHz) from a fieldbus controller to a slower HMI processor (1 MHz bus).

IC Role / Device Role / Timing Role: SN74ACT3632-20PCB acts as a clock-domain crossing FIFO, absorbing jitter and burst traffic between deterministic and variable-latency subsystems.

Use Value: Prevents data loss during bus arbitration delays; 512-word depth absorbs >50 ms of worst-case scan bursts at 10 kHz.

Use Scenario: Streaming sensor fusion results from a C67x DSP to an ARM-based host running Linux, with strict timing deadlines for motion control.

IC Role / Device Role / Timing Role: SN74ACT3632-20PCB serves as a decoupled data buffer, isolating DSP's 100 MHz clock domain from ARM's 200 MHz AXI bus.

Use Value: 11 ns access time ensures sub-microsecond response to DMA requests; mailbox registers deliver urgent interrupt commands without FIFO queuing delay.

Telecom Line Card Inter-Processor Link

Automotive ADAS Sensor Aggregation

Use Scenario: Connecting a framer ASIC (62.5 MHz) to a packet processor (125 MHz) in a multi-service access router line card.

IC Role / Device Role / Timing Role: SN74ACT3632-20PCB provides bidirectional buffering with independent flag sets, allowing full-duplex HDLC frame exchange across clock domains.

Use Value: Programmable AFA/AEB thresholds enable adaptive flow control matching link-layer protocol overhead; 67 MHz clock support matches OC-3 timing budgets.

Use Scenario: Aggregating raw camera, radar, and ultrasonic data streams into a central domain controller for autonomous driving decision logic.

IC Role / Device Role / Timing Role: SN74ACT3632-20PCB functions as a safety-critical data concentrator FIFO, with mailbox registers delivering ASIL-B-compliant fault alerts.

Use Value: Dual FIFO architecture allows concurrent ingestion of 36-bit radar frames and emission of 36-bit fused object lists; two-stage flag sync meets ISO 26262 timing analysis requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT3622-20PCB	Single 512 × 36 FIFO (no dual-FIFO or mailbox registers); identical PCB package and pinout.	Lacks bidirectional buffering and mailbox bypass; suitable only for unidirectional data paths.	Select when system requires only one FIFO direction and space/power constraints preclude dual-device implementation.
SN74ACT3642-20PCB	Same dual-FIFO + mailbox architecture but with 1024 × 36 depth per FIFO; pin-compatible with SN74ACT3632-20PCB in PCB package.	Provides double memory depth for longer burst absorption; same flag logic and timing behavior.	Choose when application demands >512-word buffering-e.g., video frame buffering or high-jitter network packet aggregation.

Compared with SN74ACT3622-20PCB and SN74ACT3642-20PCB, SN74ACT3632-20PCB delivers optimal balance of bidirectional throughput, mailbox flexibility, and 512-word depth-making it ideal for real-time control bridges where both latency predictability and command/data separation are required.

Availability

SN74ACT3632-20PCB is available at Aetrix Electronics and suitable for industrial PLC backplane bridges, telecom line card inter-processor links, automotive ADAS sensor aggregators, DSP-to-microcontroller interfaces, and safety-critical data concentrators requiring stable component supply across extended product lifecycles.

Supply support for SN74ACT3632-20PCB 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 decades of expertise in high-reliability timing and interface ICs.

SN74ACT3632-20PCB belongs to TI's ACT-family advanced CMOS clocked FIFO product line, engineered for robust clock-domain crossing in industrial automation, communications infrastructure, and automotive electronics.

FAQ

What is the exact memory configuration of the SN74ACT3632-20PCB?

The SN74ACT3632-20PCB integrates two independent 512-word × 36-bit clocked FIFOs (FIFO1 and FIFO2), each with dedicated read/write pointers, status flags, and mailbox registers. It does not implement shared memory or cross-FIFO addressing-each FIFO operates as a physically isolated 18,432-bit buffer.

How are the almost-full and almost-empty flag offsets programmed in SN74ACT3632-20PCB?

SN74ACT3632-20PCB supports two offset programming methods: (1) preset values (8/16/64) selected via FS0/FS1 latched on RST1↑/RST2↑, or (2) full 9-bit programmability (1–508) loaded from port-A writes to Y1/X1/Y2/X2 registers after simultaneous FIFO reset with FS0=FS1=L. Both methods are documented in TI's SCAS224D datasheet.

Is SN74ACT3632-20PCB pin-compatible with other devices in the same family?

Yes-SN74ACT3632-20PCB is pin-to-pin compatible with SN74ACT3622-20PCB (single FIFO) and SN74ACT3642-20PCB (dual FIFO, 1024×36) in the 120-pin PCB package. Signal mapping, power/ground pin locations, and control interface timing are identical, enabling drop-in replacement where depth or feature set permits.

What is the role of the mailbox registers in SN74ACT3632-20PCB?

The SN74ACT3632-20PCB includes two 36-bit mailbox registers (Mail1 and Mail2) with dedicated flags (MBF1 and MBF2). They enable immediate, non-queued transfer of control words-such as interrupt triggers or configuration updates-between port-A and port-B without consuming FIFO storage or affecting data flow timing.

Does SN74ACT3632-20PCB support asynchronous clock domains between CLKA and CLKB?

Yes-SN74ACT3632-20PCB explicitly supports asynchronous operation of CLKA and CLKB, including phase misalignment and frequency mismatch. All status flags (IRA/ORA/AFA/AEA and IRB/ORB/AFB/AEB) are two-stage synchronized to their respective port clocks, meeting JEDEC metastability immunity requirements for robust cross-domain signaling.

SN74ACT3632-20PCB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 120-LQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Size:: 36K (512 x 36 x 2)

Function:: Synchronous

Data Rate:: 50MHz

Access Time:: 13ns

Voltage - Supply:: 4.5 V ~ 5.5 V

Current - Supply (Max):: 400µA

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:: 120-HLQFP (14x14)

SN74ACT3632-20PCB FAQ

1.How can I place an order for SN74ACT3632-20PCB through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ACT3632-20PCB 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 SN74ACT3632-20PCB reliable?

The price and inventory of SN74ACT3632-20PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT3632-20PCB is usually 5 days.

3.What payment methods are accepted for SN74ACT3632-20PCB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT3632-20PCB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ACT3632-20PCB?

SN74ACT3632-20PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ACT3632-20PCB 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 SN74ACT3632-20PCB?

For technical support, including SN74ACT3632-20PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT3632-20PCB requirements.

6.How does Aetrix verify that SN74ACT3632-20PCB is sourced from the original manufacturer or authorized distributors?

All SN74ACT3632-20PCB 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 SN74ACT3632-20PCB meets industry standards.

7.What is the process for return or replacement of SN74ACT3632-20PCB?

All SN74ACT3632-20PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT3632-20PCB, 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 SN74ACT3632-20PCB part is unused and in its original packaging.

Return procedure for SN74ACT3632-20PCB:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…