My Inquiry
My Account
Renesas IDT71256SA12YI
- Part No.:
- IDT71256SA12YI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA12YI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,938
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IDT71256SA12YI from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM operating at 5V with 12ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, and single-chip-select architecture. It serves as fast, non-refreshing main or buffer memory in real-time control systems requiring deterministic read/write latency.
For engineers reviewing the IDT71256SA12YI datasheet, IDT71256SA12YI pinout, IDT71256SA12YI application, or IDT71256SA12YI equivalent, this page delivers verified timing parameters, package mapping to 28-pin SOJ (PJG28), industrial-grade DC/AC specs, and functionally matched alternatives for legacy system maintenance and drop-in replacement planning.
Technical Context
The IDT71256SA12YI implements fully static asynchronous circuitry-no clocks or refresh required-and uses dual-control logic with independent Chip Select (CS) and Output Enable (OE) inputs to manage read/write cycles and output impedance states. Its bidirectional I/O pins operate directly at TTL voltage levels without external level-shifting.
It supports two distinct standby modes: ISB (TTL-level CS deassertion, 40mA max) and ISB1 (CMOS-level CS deassertion, 15mA max), enabling dynamic power optimization in intermittently active embedded systems. All timing parameters-including tAA (12ns), tRC (12ns), and tOE (6ns)-are guaranteed across the full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); enables byte-wide data bus interfacing without multiplexing or external data-width conversion. |
| Access Time (tAA) | 12 ns max; ensures sub-83 MHz sustained random-access throughput in microcontroller or FPGA-based memory subsystems. |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5V logic rails and tolerant of ±10% regulation variation. |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, transportation, and outdoor equipment deployments. |
| I/O Compatibility | TTL-compatible inputs and outputs; eliminates need for interface buffers when connecting to 5V microcontrollers or CPLDs. |
| Standby Current (ISB1) | 15 mA max at CMOS-level CS deassertion; reduces idle power by >60% versus TTL-level standby mode. |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mount compatible with standard reflow profiles and legacy through-hole board footprints via adapter. |
Pinout & Package
Package: 28-pin 300-mil Plastic SOJ (PJG28), lead pitch 0.050", body width 0.300", compliant with JEDEC MO-050AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; no internal latching-address must be stable before CS/WE transitions. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled implicitly by CS/WE/OE states-no external direction control needed. |
| CS | Chip Select | Active-low enable for device selection; asserts internal logic and powers array-deassertion enters ISB or ISB1 standby per input threshold. |
| OE | Output Enable | Active-low control for output drivers only; allows read operations while CS remains asserted, enabling interleaved access schemes. |
| WE | Write Enable | Active-low write strobe; initiates write cycle on falling edge when CS is low-timing-critical for tWP (8ns min) and tDW (6ns min). |
| VCC, GND | Power Supply | Single 5V supply with dedicated VCC and GND pins; decoupling required within 10 mm of VCC/GND pair per JEDEC SOJ layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| 12ns Access + 12ns Cycle Time | Enables deterministic 83 MHz burst read/write operation in tightly timed control loops without wait states. |
| Dual Standby Modes (ISB/ISB1) | Reduces quiescent current from 40 mA to 15 mA when CS driven above VHC, improving thermal margin in sealed enclosures. |
| TTL-Compatible I/O | Direct connection to legacy 8051, Z80, or FPGA I/O banks without level translators-reducing BOM count and signal integrity risk. |
| Industrial Temperature Range | Validated operation from –40°C to +85°C ensures reliability in motor drives, PLC backplanes, and railway signaling hardware. |
| Green (RoHS-Compliant) Packaging | Pb-free SOJ construction meets EU RoHS Directive 2011/65/EU and supports lead-free reflow assembly. |
Applications
| Industrial PLC Memory Buffer | Medical Imaging Frame Store |
|---|---|
|
Use Scenario: Storing real-time I/O scan data between CPU cycles in modular programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile-equivalent fast-access scratchpad memory with zero refresh overhead and deterministic 12ns read latency. Use Value: Eliminates DMA arbitration delays and guarantees sub-microsecond response to fieldbus interrupt requests under worst-case thermal conditions. |
Use Scenario: Holding uncompressed grayscale frames during real-time ultrasound image acquisition prior to DSP processing. IC Role / Device Role / Timing Role: High-bandwidth pixel buffer interfaced directly to 8-bit parallel ADC output and FPGA pixel pipeline. Use Value: Sustains 25 MB/s continuous write/read throughput without FIFO bottlenecks, preserving temporal resolution in diagnostic imaging. |
| Avionics Display Controller Cache | Ruggedized Test Equipment Data Log |
|
Use Scenario: Caching GUI bitmaps and font glyphs in airborne multifunction displays subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Radiation-tolerant (non-DRAM) frame cache with guaranteed operation at –40°C and +85°C ambient. Use Value: Prevents display corruption during rapid cabin temperature shifts and eliminates periodic refresh-induced visual artifacts. |
Use Scenario: Capturing sensor telemetry streams in portable field calibrators used in oil/gas pipeline inspection. IC Role / Device Role / Timing Role: Low-power, high-reliability temporary storage for timestamped analog readings before SD card transfer. Use Value: Extends battery life via ISB1 standby mode (15 mA) while maintaining instant wake-up capability for unscheduled trigger events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZAXI | 32K × 8-bit, 45ns access, 3.3V core (with 5V-tolerant I/O), TSOP-28 package | Lower speed but lower voltage; requires level translation for pure 5V systems | Select when migrating to 3.3V domains or when 45ns latency is acceptable for cost reduction |
| AS6C4008-12PIN | 32K × 8-bit, 12ns access, 5V-only, PDIP-28 and SOJ-28 packages, industrial grade | Identical speed and voltage; differs in AC timing margins (e.g., tOH = 4ns vs. 3ns) and leakage specs | Drop-in replacement for IDT71256SA12YI in SOJ-28 footprint where tighter output hold time is not critical |
Compared with CY62128EV30LL-45ZAXI and AS6C4008-12PIN, the IDT71256SA12YI offers superior 12ns access at 5V with proven industrial thermal stability and TTL-native I/O-making it optimal for maintaining legacy 5V controller designs without redesigning power or interface layers.
Availability
IDT71256SA12YI is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, avionics display controllers, and ruggedized test equipment requiring stable component supply across extended lifecycle programs.
Supply support for IDT71256SA12YI 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 memory solutions for automotive, industrial, and infrastructure markets.
IDT71256SA12YI belongs to Renesas' legacy high-speed CMOS SRAM product line, engineered for deterministic, low-latency memory interfacing in mission-critical industrial and transportation control systems.
FAQ
What is the maximum guaranteed access time for IDT71256SA12YI across its full operating temperature range?
The IDT71256SA12YI has a maximum guaranteed address access time (tAA) of 12 ns over the full industrial temperature range of –40°C to +85°C, as specified in the AC Electrical Characteristics table under the 71256SA12 speed grade. This value is production-tested and applies to all valid VCC (4.5 V to 5.5 V) and loading conditions defined in the datasheet.
Does IDT71256SA12YI require a clock or refresh circuit to operate?
No, the IDT71256SA12YI uses fully static asynchronous circuitry and requires no clock signal or periodic refresh cycles. It retains data indefinitely as long as VCC is maintained within specification and CS is held high (deselected) or low (selected) with appropriate timing-making it ideal for simple, low-overhead memory interfaces.
Which package type does IDT71256SA12YI use, and is it RoHS-compliant?
IDT71256SA12YI is packaged in a 28-pin 300-mil Plastic SOJ (PJG28) and is RoHS-compliant ("Green") per Renesas' ordering information. The "Y" in the part number denotes SOJ packaging, and the "I" suffix confirms industrial temperature qualification and Pb-free construction.
How does the dual standby mode (ISB vs. ISB1) affect power consumption in IDT71256SA12YI?
IDT71256SA12YI draws 40 mA max in ISB mode (CS > VIH) and only 15 mA max in ISB1 mode (CS > VHC), providing a 62.5% reduction in standby current. Designers achieve ISB1 by driving CS above VHC (≈4.8 V at VCC = 5.0 V), which is feasible using a simple resistor divider or logic-level shifter in 5V systems.
Can IDT71256SA12YI be used as a direct replacement for IDT71256SA12YG in existing designs?
Yes-IDT71256SA12YI and IDT71256SA12YG share identical electrical specifications, pinout, and SOJ-28 (PJG28) package; the "I" suffix denotes industrial temperature qualification, while "Y" indicates SOJ packaging. No PCB or firmware changes are required when upgrading from commercial to industrial grade in the same speed and package variant.
IDT71256SA12YI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
IDT71256SA12YI FAQ
1.How can I place an order for IDT71256SA12YI through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA12YI 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 IDT71256SA12YI reliable?
The price and inventory of IDT71256SA12YI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA12YI is usually 5 days.
3.What payment methods are accepted for IDT71256SA12YI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA12YI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA12YI?
IDT71256SA12YI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA12YI 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 IDT71256SA12YI?
For technical support, including IDT71256SA12YI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA12YI requirements.
6.How does Aetrix verify that IDT71256SA12YI is sourced from the original manufacturer or authorized distributors?
All IDT71256SA12YI 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 IDT71256SA12YI meets industry standards.
7.What is the process for return or replacement of IDT71256SA12YI?
All IDT71256SA12YI units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA12YI, 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 IDT71256SA12YI part is unused and in its original packaging.
Return procedure for IDT71256SA12YI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA12YI 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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.
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…
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…
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…
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 …
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…
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…
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…
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…
