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

Renesas 72V82L15PAG

Name: 72V82L15PAG
Brand: Renesas
SKU: 72V82L15PAG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 72V82L15PAG

Manufacturer:: Renesas

Category:: FIFOs Memory

Package:: 56-TFSOP (0.240", 6.10mm Width)

Datasheet:: 72V82L15PAG.pdf

Description:: IC FIFO ASYNC 1KX9X2 56TSSOP

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Product details

Overview

72V82L15PAG from Renesas Electronics (formerly IDT) is a 3.3 V CMOS dual asynchronous FIFO memory IC with two independent 1,024 × 9-bit data buffers, 15 ns access time, industrial temperature range (–40°C to +85°C), and TSSOP-56 package. It supports simultaneous read/write, auto-retransmit, and status flags (Empty, Full, Half-Full) for bidirectional buffering in rate-matching applications.

For engineers reviewing the 72V82L15PAG datasheet, 72V82L15PAG pinout, 72V82L15PAG application, or 72V82L15PAG equivalent, this page delivers verified technical context, real-world timing constraints, dual-FIFO expansion modes, flag behavior under reset/retransmit, and validated alternatives for legacy FIFO migration.

Technical Context

The 72V82L15PAG implements two fully independent FIFO cores sharing no internal arbitration-each with dedicated 9-bit data I/O, separate read/write enables (RA/RB, WA/WB), and individual status flags (EFA/EFB, FFA/FFB, HFA/HFB). Its ring-pointer architecture eliminates external address management and enables true asynchronous operation between channels.

It supports three primary operating modes: Single Device (XI grounded), Depth Expansion (XO→XI daisy-chain with FL/RT logic), and Width Expansion (parallel control lines across both FIFOs). Retransmit (RT) resets only the read pointer without affecting write state, and Half-Full Flag (HF) is active only in Single Device or Width Expansion modes-not in Depth Expansion.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width	2 × 1,024 × 9 bits - provides dual independent buffers for full-duplex data flow without shared resource contention
Access Time (t_A)	15 ns max - enables reliable operation at up to 40 MHz shift frequency in commercial grade, critical for high-speed interface bridging
Supply Voltage	3.0 V to 3.6 V - compatible with standard 3.3 V logic domains and tolerant of typical PCB rail variation
Operating Temperature	–40°C to +85°C - qualified for industrial environments including motor control, PLC, and instrumentation systems
Power Consumption	Active: ≤100 mA (330 mW), Power-down: ≤5 mA (18 mW) - supports low-duty-cycle buffering in power-sensitive embedded designs
Status Flags	Empty (EF), Full (FF), Half-Full (HF) per FIFO - enables precise buffer level monitoring without polling or software overhead
Retransmit Function	RT input resets read pointer to start address while preserving write pointer position - essential for protocol retransmission and error recovery sequences

Pinout & Package

72V82L15PAG is housed in a 56-pin Thin Shrink SOIC (TSSOP-56, order code PA), measuring 14.0 mm × 6.1 mm × 1.2 mm, with 0.5 mm lead pitch and SnPb (EOL) or green (Pb-free) finish options.

Pin/Terminal	Circuit Role	Design Meaning
WA, WB	Write Enable A/B	Falling-edge-triggered write strobe for respective FIFO; must be high during reset and retransmit
RA, RB	Read Enable A/B	Falling-edge-triggered read strobe; outputs enter high-Z when RA/RB = high
DA0–DA8, DB0–DB8	Data Inputs A/B	9-bit parallel input buses; support parity bit insertion or extended control signaling
QA0–QA8, QB0–QB8	Data Outputs A/B	Three-state outputs enabled only during active read cycle; t_RLZ = 3 ns ensures fast bus release
EFA, EFB	Empty Flag A/B	Active-low open-drain output indicating zero unread words; used to gate read enable externally
FFA, FFB	Full Flag A/B	Active-low open-drain output indicating no remaining write locations; used to gate write enable externally
HFA, HFB	Half-Full Flag A/B	Active-low output asserted when ≥512 words stored; valid only in Single Device/Width Expansion mode
FLA/RTA, FLB/RTB	First Load / Retransmit A/B	Dual-function pin: grounded for first device in depth chain; pulsed low to reset read pointer in single-device mode
XIA, XIB	Expansion In A/B	Ground to select Single Device mode; connects to XO of prior device in depth expansion chain
XOA, XOB	Expansion Out A/B	Drives XI of next device upon reaching last location; disabled in Single Device mode
RS	Reset	Synchronous active-low reset that sets both read/write pointers to zero; required before initial write
V_CC, GND	Power Supply	Single 3.3 V supply with decoupling recommended per datasheet layout guidelines

Key Features

Feature	Design Value
Dual independent FIFO cores	Enables full-duplex buffering on same die-no arbitration logic needed, reducing system latency and PCB routing complexity
15 ns access time with 3.3 V supply	Supports 40 MHz data throughput in commercial grade, meeting timing budgets for PCI, ISA, and custom parallel bus interfaces
Retransmit (RT) capability	Allows deterministic restart of read sequence without data loss or write interruption-critical for UART-like retry protocols
Half-Full Flag (HF)	Provides early buffer occupancy warning for flow control decisions, avoiding late-stage overflow/underflow interrupts
Depth and Width Expansion support	Permits scalable memory arrays (e.g., 4,096 × 9 via two devices, or 1,024 × 18 via parallel data paths) without redesigning control logic

Applications

Industrial Data Acquisition	Legacy Bus Bridging
Use Scenario: High-speed sensor sampling (e.g., 16-bit ADC at 1 MSPS) feeding into an FPGA-based controller with variable processing latency. IC Role / Device Role / Timing Role: Dual-FIFO acts as rate-matching buffer-FIFO A accepts ADC data asynchronously, FIFO B feeds processed results back to host microcontroller. Use Value: Prevents data loss during burst processing; 1,024-word depth accommodates worst-case 1 ms latency gap; HF flag triggers DMA prefetch to minimize CPU overhead.	Use Scenario: Interfacing a 16-bit ISA bus peripheral to a modern ARM SoC with 32-bit AXI interface and mismatched clock domains. IC Role / Device Role / Timing Role: 72V82L15PAG serves as dual-width-expansion bridge-two 9-bit FIFOs combined into 18-bit path, with one FIFO handling address/data multiplexing and the other managing control/status handshake. Use Value: Eliminates need for external glue logic; 15 ns access time meets ISA's 250 ns cycle requirement; EF/FF flags enable cycle-accurate handshaking without wait-state insertion.
Protocol Repeater Systems	Motor Control Feedback Loop
Use Scenario: CAN-to-RS485 gateway where packetized messages require retransmission on CRC failure detected by downstream node. IC Role / Device Role / Timing Role: One FIFO stores incoming CAN frames; RT signal triggers retransmit of entire frame upon NACK response, preserving write pointer for new arrivals. Use Value: Enables atomic frame replay without software intervention; 1,024-word depth supports multi-packet messages; t_RTF ≤30 ns guarantees flag validity within protocol timing budget.	Use Scenario: Real-time closed-loop servo drive using FPGA-based PWM generation and analog feedback sampling at 20 kHz, requiring jitter-free encoder pulse capture and command dispatch. IC Role / Device Role / Timing Role: FIFO A buffers quadrature encoder counts from analog front-end; FIFO B queues motion commands from host; both operate independently under separate clock domains. Use Value: Decouples sampling and actuation timing; industrial temp rating ensures reliability near motors; Empty/Full flags prevent overrun in safety-critical motion sequencing.

Industrial Data Acquisition

Legacy Bus Bridging

Use Scenario: High-speed sensor sampling (e.g., 16-bit ADC at 1 MSPS) feeding into an FPGA-based controller with variable processing latency.

IC Role / Device Role / Timing Role: Dual-FIFO acts as rate-matching buffer-FIFO A accepts ADC data asynchronously, FIFO B feeds processed results back to host microcontroller.

Use Value: Prevents data loss during burst processing; 1,024-word depth accommodates worst-case 1 ms latency gap; HF flag triggers DMA prefetch to minimize CPU overhead.

Use Scenario: Interfacing a 16-bit ISA bus peripheral to a modern ARM SoC with 32-bit AXI interface and mismatched clock domains.

IC Role / Device Role / Timing Role: 72V82L15PAG serves as dual-width-expansion bridge-two 9-bit FIFOs combined into 18-bit path, with one FIFO handling address/data multiplexing and the other managing control/status handshake.

Use Value: Eliminates need for external glue logic; 15 ns access time meets ISA's 250 ns cycle requirement; EF/FF flags enable cycle-accurate handshaking without wait-state insertion.

Protocol Repeater Systems

Motor Control Feedback Loop

Use Scenario: CAN-to-RS485 gateway where packetized messages require retransmission on CRC failure detected by downstream node.

IC Role / Device Role / Timing Role: One FIFO stores incoming CAN frames; RT signal triggers retransmit of entire frame upon NACK response, preserving write pointer for new arrivals.

Use Value: Enables atomic frame replay without software intervention; 1,024-word depth supports multi-packet messages; t_RTF ≤30 ns guarantees flag validity within protocol timing budget.

Use Scenario: Real-time closed-loop servo drive using FPGA-based PWM generation and analog feedback sampling at 20 kHz, requiring jitter-free encoder pulse capture and command dispatch.

IC Role / Device Role / Timing Role: FIFO A buffers quadrature encoder counts from analog front-end; FIFO B queues motion commands from host; both operate independently under separate clock domains.

Use Value: Decouples sampling and actuation timing; industrial temp rating ensures reliability near motors; Empty/Full flags prevent overrun in safety-critical motion sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
72V82L20PAG	20 ns access time (vs. 15 ns); otherwise identical pinout, function, and timing structure	Suitable where 40 MHz shift frequency not required; lower speed grade reduces cost and EMI in noise-sensitive analog-adjacent layouts	Select when system timing margin allows relaxed t_A; identical footprint enables drop-in replacement if clock rates permit
72V83L15PAG	2,048 × 9-bit depth per FIFO (2× capacity); same 15 ns access, TSSOP-56 package, and feature set	Required when buffer depth exceeds 1,024 words-e.g., video line buffering or longer protocol packet storage	Choose for higher depth needs; pin-compatible but requires validation of flag timing and expansion logic at larger depths

Compared with 72V82L15PAG, the 72V82L20PAG trades 5 ns speed for cost and noise margin, while the 72V83L15PAG doubles depth without altering timing or interface-making them distinct solutions for bandwidth-constrained versus capacity-constrained designs.

Availability

72V82L15PAG is available at Aetrix Electronics and suitable for industrial data acquisition, legacy bus bridging, protocol repeater systems, and motor control feedback loop applications requiring stable component supply amid end-of-life transitions.

Supply support for 72V82L15PAG 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The 72V82L15PAG belongs to Renesas' legacy IDT AsyncFIFO™ family-designed specifically for deterministic, low-latency, asynchronous data buffering in mixed-clock-domain systems where software-managed queues introduce unacceptable jitter or overhead.

FAQ

What is the maximum operating frequency supported by the 72V82L15PAG?

The 72V82L15PAG supports a maximum shift frequency of 40 MHz in commercial temperature range and 33.3 MHz in industrial range, derived from its 15 ns access time and specified AC timing parameters (t_RC, t_WC). These values are guaranteed under V_CC = 3.3 V ±0.3 V and load conditions defined in Figure 1 of the datasheet. The 72V82L15PAG does not include internal PLLs or clock multipliers-its timing is strictly governed by external W/R pulse widths and setup/hold requirements.

Does the 72V82L15PAG support depth expansion with more than two devices?

Yes, the 72V82L15PAG supports arbitrary-depth expansion via daisy-chained XI/XO connections, with no theoretical upper limit. Each additional device adds 1,024 × 9 bits to total depth, provided external logic ORs all EF and FF signals to generate composite flags. The 72V82L15PAG's expansion protocol is fully documented in Figures 14 and 15 of the datasheet, and the FL/RT pin configuration ensures deterministic initialization order across the chain.

Can the Half-Full Flag (HF) be used in Depth Expansion mode?

No-the Half-Full Flag (HF) is explicitly disabled in Depth Expansion mode per datasheet Section "OPERATING MODES" and Table I. When XI is driven high (not grounded), the XO/HF pin functions solely as Expansion Out (XO), and HF assertion logic is internally gated off. This restriction ensures predictable flag behavior during multi-device chaining; users must rely on composite EF/FF monitoring instead of HF for flow control in expanded configurations.

Is the 72V82L15PAG pin-compatible with the 72V81 or 72V83 series?

Yes-the 72V82L15PAG shares identical TSSOP-56 pinout, signal naming, and functional mapping with the 72V81L15PAG and 72V83L15PAG families. All three use the same pin assignment for WA/WB, RA/RB, DA0–DA8/DB0–DB8, QA0–QA8/QB0–QB8, and flag/control lines. However, memory depth differs (512×9, 1,024×9, 2,048×9), so software or logic expecting specific buffer size must be verified for compatibility.

What happens to the write pointer during a retransmit operation on the 72V82L15PAG?

During a retransmit operation (RT pulsed low), only the read pointer resets to the first memory location; the write pointer remains unchanged and continues tracking newly written data. This behavior is confirmed in the "SIGNAL DESCRIPTIONS" section and Figure 6 of the datasheet. As a result, the 72V82L15PAG can sustain continuous write activity-including during retransmit-enabling seamless protocol recovery without data loss or pipeline stall.

72V82L15PAG Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 72V

Package/Case:: 56-TFSOP (0.240", 6.10mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Size:: 18K (1K x 9 x 2)

Function:: Asynchronous

Data Rate:: 40MHz

Access Time:: 15ns

Voltage - Supply:: 3 V ~ 3.6 V

Current - Supply (Max):: 100mA

Bus Directional:: Bi-Directional

Expansion Type:: Depth, Width

Programmable Flags Support:: No

Retransmit Capability:: Yes

FWFT Support:: No

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Supplier Device Package:: 56-TSSOP

72V82L15PAG FAQ

1.How can I place an order for 72V82L15PAG through Aetrix?

Please submit a Request for Quotation (RFQ) for 72V82L15PAG 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 72V82L15PAG reliable?

The price and inventory of 72V82L15PAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72V82L15PAG is usually 5 days.

3.What payment methods are accepted for 72V82L15PAG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72V82L15PAG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 72V82L15PAG?

72V82L15PAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 72V82L15PAG 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 72V82L15PAG?

For technical support, including 72V82L15PAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72V82L15PAG requirements.

6.How does Aetrix verify that 72V82L15PAG is sourced from the original manufacturer or authorized distributors?

All 72V82L15PAG 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 72V82L15PAG meets industry standards.

7.What is the process for return or replacement of 72V82L15PAG?

All 72V82L15PAG units undergo pre-shipment inspection (PSI). If there is an issue with 72V82L15PAG, 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 72V82L15PAG part is unused and in its original packaging.

Return procedure for 72V82L15PAG:

1.Submit a request within 90 days.

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

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