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Renesas 7025S55GB
- Part No.:
- 7025S55GB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-BPGA
- Datasheet:
-
7025S55GB.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,685
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Product details
Overview
7025S55GB from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read/write cycle time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded control systems.
For engineers reviewing the 7025S55GB datasheet, 7025S55GB pinout, 7025S55GB application, or 7025S55GB equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing under address contention, semaphore flag update pulse width, battery-backed data retention at 2 V, and compatibility with 84-pin PGA or PLCC layouts in deterministic real-time systems.
Technical Context
The 7025S55GB implements full on-chip hardware semaphore logic with eight addressable flags (A0–A2), enabling inter-processor synchronization without external logic. Its port arbitration resolves simultaneous access via BUSY assertion-either by chip enable (M/S = H) or address match-with tBDD ≤ 30 ns (max) ensuring valid read data after BUSY deassertion.
It operates fully asynchronously from either port, supports separate upper- and lower-byte control (UBL/LBL), and includes automatic power-down via CE-driven standby modes: ISB1 = 13 mA (both ports TTL-level standby), ISB3 = 1.0 mA (both ports CMOS-level full standby). Data retention at VCC = 2 V is guaranteed for the L-version; the S-version (7025S55GB) specifies ICC = 155 mA typ. at fMAX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16 bits (128 Kbit); supports independent concurrent reads/writes on left and right ports |
| Access Time (tAA) | 25 ns max; defines minimum address-to-valid-data delay for deterministic real-time response |
| Read Cycle Time (tRC) | 55 ns max; sets maximum sustained throughput for burst-mode dual-port operation |
| Supply Voltage | 5.0 V ±10%; compatible with legacy TTL logic families and eliminates level-shifting in 5 V systems |
| Operating Temperature | –40°C to +85°C; qualified for industrial control, motor drives, and avionics subsystems |
| Package | 84-pin PGA (PLG84) or 84-pin PLCC; pin-compatible footprint for layout reuse across speed grades |
| Standby Current (ISB1) | 13 mA max (both ports active CE); enables low-power idle states without external power gating |
Pinout & Package
7025S55GB is available in an 84-pin ceramic Pin Grid Array (PLG84) package measuring approximately 1.15 in × 1.15 in × 0.17 in, with all VCC and GND pins requiring dedicated decoupling per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Independent port activation; deassertion places corresponding port in high-Z output and low-power standby |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low signal determining data direction per port; enables true asynchronous dual-operation |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables byte-level granularity for multiplexed bus interfacing and 8-bit peripheral coexistence |
| SEML / SEMR | Semaphore Enable | Activates on-chip 8-flag semaphore register (addressed by A0–A2) for inter-processor coordination |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | M/S = H: BUSY outputs contention status; M/S = L: BUSY input gates write initiation to prevent collision |
| INTL / INTR | Interrupt Flag | Open-drain push-pull output signaling semaphore or memory event to host controller without polling |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous read/write to identical addresses-critical for lock-free buffer sharing in DSP and FPGA co-processing |
| Hardware Semaphore Logic | Eight dedicated flags with atomic read/write eliminate need for external arbitration logic or software mutex overhead |
| Master/Slave Cascading | Single M/S pin configures device as master (BUSY output) or slave (BUSY input), enabling seamless 32-bit+ word expansion |
| Full Asynchronous Operation | No clock required-ports operate independently with no global timing constraints, simplifying mixed-signal system integration |
| TTL-Compatible I/O | Direct interface with 5 V microcontrollers, FPGAs, and ASICs without level translators or voltage margining |
Applications
| Industrial PLC Memory Buffer | DSP-FPGA Co-Processing Interface |
|---|---|
Use Scenario: Real-time I/O scanning and ladder logic execution in programmable logic controllers requiring deterministic memory access. IC Role / Device Role / Timing Role: Dual-port RAM serves as shared scratchpad between CPU and motion-control coprocessor; BUSY arbitration prevents race conditions during concurrent updates. Use Value: 55 ns tRC and sub-30 ns tBDD ensure <100 ns worst-case interlock resolution-meeting IEC 61131-3 cycle-time requirements for safety-critical motion axes. | Use Scenario: High-throughput data exchange between Xilinx FPGA and TI C6000 DSP in radar signal processing pipelines. IC Role / Device Role / Timing Role: Acts as zero-wait-state frame buffer; left port interfaces FPGA DMA, right port feeds DSP instruction/data fetch. Use Value: Independent 8K×16 banks allow simultaneous FFT coefficient loading (FPGA) and real-time filtering (DSP) without pipeline stalls or external FIFOs. |
| Avionics Display Controller | Redundant Flight Control System |
Use Scenario: Graphics rendering engine updating cockpit display buffers while flight management unit writes telemetry overlays. IC Role / Device Role / Timing Role: Left port driven by GPU for pixel writes; right port accepts telemetry packets from FMS via interrupt-driven semaphore handshake. Use Value: INTL/INTR flags and tINS ≤ 20 ns enable sub-millisecond overlay updates-meeting DO-178C Level A timing assurance for primary flight displays. | Use Scenario: Cross-channel data validation in triple-modular-redundant (TMR) flight computers where three processors compare sensor inputs. IC Role / Device Role / Timing Role: Provides shared memory space for voting logic; semaphores coordinate write access to prevent inconsistent state propagation. Use Value: Hardware semaphore atomicity and tSPS = 5 ns contention window guarantee deterministic tie-breaking-eliminating metastability risk in fail-operational architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C028V-55AXC | 55 ns access, 8K × 16, 3.3 V core (5 V tolerant I/O), 100-pin TQFP only | Requires level translation in legacy 5 V systems; lacks battery backup mode | Select when migrating to lower-power 3.3 V designs with FPGA integration and no 2 V retention requirement |
| IDT70V25S55PF | 55 ns, 8K × 16, 3.3 V supply, 100-pin TQFP, supports JTAG boundary scan | Not pin-compatible; incompatible voltage domain; no BUSY arbitration in slave mode | Choose for new 3.3 V designs needing IEEE 1149.1 testability and higher-density packaging |
Compared with CY7C028V-55AXC and IDT70V25S55PF, the 7025S55GB uniquely delivers 5 V native operation, 84-pin PGA/PLCC drop-in compatibility with legacy industrial layouts, and hardware BUSY-based arbitration essential for deterministic real-time systems-making it irreplaceable in retrofit and safety-certified applications.
Availability
7025S55GB is available at Aetrix Electronics and suitable for industrial PLCs, avionics display systems, and redundant flight control units requiring stable component supply across extended product lifecycles.
Supply support for 7025S55GB 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 semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.
The IDT7025 family was designed specifically for deterministic real-time systems requiring contention-free dual-ported memory-targeting industrial automation, aerospace, and military computing where hardware arbitration and predictable latency are non-negotiable.
FAQ
What is the operating temperature range specified for the 7025S55GB?
The 7025S55GB is rated for the industrial temperature range of –40°C to +85°C. This specification is explicitly confirmed in the datasheet's "Maximum Operating Temperature and Supply Voltage" table (Table 2683 tbl 05), where the "Industrial" grade lists TA = –40°C to +85°C at VCC = 5.0 V ±10%. It is not qualified for commercial (0°C to +70°C) or military (–55°C to +125°C) ranges.
Does the 7025S55GB support battery backup data retention?
No, the 7025S55GB does not support battery backup data retention. That feature is exclusive to the "L" variant (e.g., 7025L55GB), which specifies VDR = 2.0 V and ICCDR ≤ 4000 µA in Table 2683 tbl 10. The "S" suffix in 7025S55GB denotes standard power operation only; its standby current (ISB1 = 13 mA max) and absence of 2 V retention specs confirm it lacks battery backup capability.
What package types are available for the 7025S55GB?
The 7025S55GB is available in two package variants: 84-pin ceramic Pin Grid Array (PLG84) and 84-pin Plastic Leaded Chip Carrier (PLCC), as documented in the "Pin Configurations" section (Drawings 2683 drw 02 and 2683 drw 04). The datasheet explicitly lists these for the 7025S/L series and confirms mechanical dimensions for both. It is not offered in Flatpack or 100-pin TQFP for this speed grade.
How does the BUSY arbitration work when the 7025S55GB is configured as a slave?
When M/S = L (low), the 7025S55GB operates as a slave: BUSYR and BUSYL become inputs-not outputs. A high BUSY signal from the master must be asserted before the slave initiates a write; tWB = 0 ns (Table 2683 tbl 14a) means the slave responds immediately to BUSY assertion, and tWH ≥ 17 ns ensures write hold integrity after BUSY deassertion. This prevents simultaneous writes during contention without requiring external logic.
Is the 7025S55GB pin-compatible with faster or slower speed grades in the same family?
Yes, the 7025S55GB is pin-compatible with other 7025S/X variants (e.g., 7025S25GB, 7025S35GB) in the same package type (84-pin PGA or PLCC). The datasheet's ordering information and pin configuration diagrams confirm identical pinouts across speed grades. Electrical differences (e.g., tRC, tAA, ICC) do not affect physical connectivity, enabling drop-in replacement for performance tuning or obsolescence mitigation within the same footprint.
7025S55GB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 84-BPGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 128Kbit
- Memory Organization:
- 8K x 16
- 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:
- 84-PGA (27.94x27.94)
7025S55GB FAQ
1.How can I place an order for 7025S55GB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S55GB 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 7025S55GB reliable?
The price and inventory of 7025S55GB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S55GB is usually 5 days.
3.What payment methods are accepted for 7025S55GB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S55GB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S55GB?
7025S55GB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S55GB 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 7025S55GB?
For technical support, including 7025S55GB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S55GB requirements.
6.How does Aetrix verify that 7025S55GB is sourced from the original manufacturer or authorized distributors?
All 7025S55GB 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 7025S55GB meets industry standards.
7.What is the process for return or replacement of 7025S55GB?
All 7025S55GB units undergo pre-shipment inspection (PSI). If there is an issue with 7025S55GB, 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 7025S55GB part is unused and in its original packaging.
Return procedure for 7025S55GB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025S55GB Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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