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

Renesas 7005S55GB

Name: 7005S55GB
Brand: Renesas
SKU: 7005S55GB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 7005S55GB

Manufacturer:: Renesas

Category:: Memory

Package:: 68-BPGA

Datasheet:: 7005S55GB.pdf

Description:: IC SRAM 64KBIT PARALLEL 68PGA

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Product details

Overview

7005S55GB from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns maximum read cycle time (tRC), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbitration logic for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7005S55GB datasheet, 7005S55GB pinout, 7005S55GB application, or 7005S55GB equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, semiconductor-level DC/AC electrical characteristics, and industrial-temperature (-40°C to +85°C) operation confirmed for the 7005S55GB variant.

Technical Context

The 7005S55GB implements fully asynchronous dual-port access with separate address, data, and control lines per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL on left; A0R–A12R/I/O0R–I/O7R/R/WR/CER/OER on right), enabling simultaneous reads of the same memory location without contention. Its on-chip arbitration logic uses BUSYL/BUSYR flags and M/S pin configuration to resolve port conflicts.

It supports semaphore signaling via SEML/SEMR pins with eight dedicated flags addressed by A0–A2, and interrupt generation through INTL/INTR outputs triggered by write-to-specific-address sequences (e.g., A12L–A0L = 1FFE_H sets INTL). Data retention at 2 V is guaranteed for the L-version; the S-version prioritizes speed over ultra-low standby current.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	8K × 8 bits (64 Kbit total), two independent 8-bit ports
Max Read Cycle Time (tRC)	55 ns - defines minimum time between successive read operations on same port
Supply Voltage	5.0 V ±10% - single TTL-compatible rail; no dual-supply or level-shifting required
Operating Temperature	-40°C to +85°C - qualified for industrial environments without derating
Active Current (ICC)	150 mA typical - measured at fMAX with both ports active and outputs disabled
Standby Current (ISB1)	13 mA typical - both ports disabled (CEL = CER = VIH), TTL-level inputs
Data Retention	Not supported - 7005S55GB is S-version; battery backup requires L-version (e.g., 7005L55GB)

Pinout & Package

7005S55GB is packaged in a 64-pin thin quad flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant and green-part qualified.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A12L	Left port address inputs	13-bit address bus for left-side memory access (0–8191 decimal)
I/O0L–I/O7L	Left port bidirectional data	8-bit parallel data path; direction controlled by R/WL and OEL
CEL, OEL, R/WL	Left port control enables	Chip Enable, Output Enable, Read/Write Enable - fully independent of right port
A0R–A12R	Right port address inputs	13-bit address bus for right-side memory access; not mirrored or shared with left
I/O0R–I/O7R	Right port bidirectional data	8-bit parallel data path; direction controlled by R/WR and OER
CER, OER, R/WR	Right port control enables	Independent enable set - allows asymmetric port usage (e.g., left as master, right as slave)
SEML, SEMR	Semaphore enable inputs	Enable semaphore flag access mode; when SEM = VIL, I/O0–I/O7 become semaphore I/O
INTL, INTR	Interrupt flag outputs	Open-drain compatible; asserted low upon write to dedicated interrupt addresses (1FFE_H/1FFF_H)
BUSYL, BUSYR	Busy status signals	Push-pull outputs (master) or inputs (slave); M/S pin configures role - critical for deadlock-free arbitration
M/S	Master/Slave select	M/S = H → BUSY outputs; M/S = L → BUSY inputs - determines arbitration authority in cascaded systems
VCC, GND	Power and ground	Multiple VCC/GND pins distributed across package for noise reduction and low-impedance decoupling
N/C	No-connect	Pins 23, 24, 47, 48, 61 - must remain unconnected per datasheet

Key Features

Feature	Design Value
True dual-port architecture	Simultaneous independent read/write access to same memory location without external logic or wait states
Hardware semaphore support	Eight dedicated flags accessible via A0–A2; eliminates software polling and reduces inter-processor latency
On-chip arbitration logic	Automatic BUSY assertion based on address match or CE timing - prevents data corruption during contention
Master/slave cascade capability	Enables 16-bit+ data bus expansion using M/S pin; removes need for discrete glue logic in wide-memory systems
TTL-compatible interface	Direct connection to 5 V microcontrollers, FPGAs, and ASICs without level shifters or bus buffers

Applications

Real-Time Industrial PLC	Dual-Core Communication Buffer
Use Scenario: Two independent CPU cores share sensor data and control commands in a programmable logic controller with deterministic response. IC Role / Device Role / Timing Role: 7005S55GB serves as a non-blocking shared memory buffer with hardware arbitration preventing race conditions during concurrent access. Use Value: Eliminates software mutex overhead and guarantees sub-55 ns memory access latency for time-critical I/O scanning cycles.	Use Scenario: A host processor offloads motion control calculations to a dedicated DSP, requiring high-throughput bidirectional data exchange. IC Role / Device Role / Timing Role: 7005S55GB acts as a zero-wait-state mailbox with semaphore signaling to coordinate task handoff and completion status. Use Value: Enables full 55 ns read/write throughput per port, sustaining >14 MB/s aggregate bandwidth without CPU intervention.
Avionics Data Concentrator	Redundant Control System Memory
Use Scenario: Flight management system aggregates telemetry from multiple sensors and routes it to primary and backup flight computers. IC Role / Device Role / Timing Role: 7005S55GB functions as a fault-tolerant dual-port memory where left port connects to sensor interface and right port to both CPUs. Use Value: BUSY-driven arbitration ensures consistent data visibility across redundant paths while meeting DO-254 timing constraints.	Use Scenario: Safety-critical railway signaling system maintains synchronized state between active and standby controllers. IC Role / Device Role / Timing Role: 7005S55GB provides mirrored memory space with interrupt-driven change notification between controllers. Use Value: INTL/INTR flags reduce failover detection time to <25 ns, satisfying SIL-4 response requirements.

Real-Time Industrial PLC

Dual-Core Communication Buffer

Use Scenario: Two independent CPU cores share sensor data and control commands in a programmable logic controller with deterministic response.

IC Role / Device Role / Timing Role: 7005S55GB serves as a non-blocking shared memory buffer with hardware arbitration preventing race conditions during concurrent access.

Use Value: Eliminates software mutex overhead and guarantees sub-55 ns memory access latency for time-critical I/O scanning cycles.

Use Scenario: A host processor offloads motion control calculations to a dedicated DSP, requiring high-throughput bidirectional data exchange.

IC Role / Device Role / Timing Role: 7005S55GB acts as a zero-wait-state mailbox with semaphore signaling to coordinate task handoff and completion status.

Use Value: Enables full 55 ns read/write throughput per port, sustaining >14 MB/s aggregate bandwidth without CPU intervention.

Avionics Data Concentrator

Redundant Control System Memory

Use Scenario: Flight management system aggregates telemetry from multiple sensors and routes it to primary and backup flight computers.

IC Role / Device Role / Timing Role: 7005S55GB functions as a fault-tolerant dual-port memory where left port connects to sensor interface and right port to both CPUs.

Use Value: BUSY-driven arbitration ensures consistent data visibility across redundant paths while meeting DO-254 timing constraints.

Use Scenario: Safety-critical railway signaling system maintains synchronized state between active and standby controllers.

IC Role / Device Role / Timing Role: 7005S55GB provides mirrored memory space with interrupt-driven change notification between controllers.

Use Value: INTL/INTR flags reduce failover detection time to <25 ns, satisfying SIL-4 response requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C024AV-55AXC	55 ns tRC, 8K × 16 organization, 3.3 V core with 5 V tolerant I/O, no built-in semaphore logic	Requires external arbitration logic for semaphore use; better suited for wider data buses than 8-bit	Select when migrating to 3.3 V systems or needing 16-bit word width; verify BUSY/interrupt compatibility
AS7C38098B-55JCIN	55 ns tRC, 8K × 8, 3.3 V only, no M/S pin or hardware semaphore support	Lacks master/slave cascade and semaphore features; relies on software coordination	Choose for cost-sensitive 3.3 V designs where arbitration is handled in firmware or external logic

Compared with CY7C024AV-55AXC and AS7C38098B-55JCIN, the 7005S55GB uniquely integrates hardware semaphore, BUSY arbitration, and M/S cascade in a 5 V TTL-compatible 8K × 8 device - making it irreplaceable in legacy industrial and avionics systems requiring deterministic, logic-free dual-processor synchronization.

Availability

7005S55GB is available at Aetrix Electronics and suitable for real-time industrial PLCs, dual-core communication buffers, avionics data concentrators, and redundant control system memory requiring stable component supply across extended product lifecycles.

Supply support for 7005S55GB 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The 7005S55GB belongs to IDT's legacy dual-port SRAM product line, engineered for deterministic inter-processor communication in harsh-environment systems where hardware arbitration and 5 V compatibility are mandatory.

FAQ

What is the maximum operating temperature range certified for the 7005S55GB?

The 7005S55GB is rated for industrial temperature operation from -40°C to +85°C. This range is explicitly validated in the datasheet for all speed grades including the 55 ns variant, with no derating required under nominal 5 V supply conditions.

Does the 7005S55GB support battery backup data retention?

No, the 7005S55GB does not support battery backup data retention. That feature is exclusive to the 'L' version (e.g., 7005L55GB), which specifies 2 V data retention and lower standby current. The 'S' suffix denotes speed-optimized operation without retention capability.

How does the M/S pin affect BUSY signal behavior on the 7005S55GB?

When M/S = H, BUSYL and BUSYR function as push-pull outputs indicating port contention status; when M/S = L, they become inputs used by the slave device to inhibit writes. This configuration enables hierarchical arbitration in multi-device systems without external logic.

Can the 7005S55GB perform simultaneous reads from both ports to the same memory address?

Yes, the 7005S55GB supports true simultaneous reads from both ports to the same memory location. Its dual-port cell architecture allows concurrent access without conflict, latency penalty, or data corruption - a core feature confirmed in the functional description and truth tables.

What package type is used for the 7005S55GB, and are there thermal or mechanical drawings available?

The 7005S55GB uses a 64-pin thin quad flatpack (TQFP) with 14 mm × 14 mm body and 0.5 mm lead pitch. Mechanical drawings, including land pattern and solder paste stencil recommendations, are published in IDT document #2738 drw 03 and available through authorized distributors.

7005S55GB Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 68-BPGA

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 64Kbit

Memory Organization:: 8K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 55ns

Access Time:: 55 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 68-PGA (29.46x29.46)

7005S55GB FAQ

1.How can I place an order for 7005S55GB through Aetrix?

Please submit a Request for Quotation (RFQ) for 7005S55GB 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 7005S55GB reliable?

The price and inventory of 7005S55GB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7005S55GB is usually 5 days.

3.What payment methods are accepted for 7005S55GB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7005S55GB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 7005S55GB?

7005S55GB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 7005S55GB 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 7005S55GB?

For technical support, including 7005S55GB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7005S55GB requirements.

6.How does Aetrix verify that 7005S55GB is sourced from the original manufacturer or authorized distributors?

All 7005S55GB 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 7005S55GB meets industry standards.

7.What is the process for return or replacement of 7005S55GB?

All 7005S55GB units undergo pre-shipment inspection (PSI). If there is an issue with 7005S55GB, 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 7005S55GB part is unused and in its original packaging.

Return procedure for 7005S55GB:

1.Submit a request within 90 days.

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

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