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Renesas IDT71256SA20Y
- Part No.:
- IDT71256SA20Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA20Y.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,641
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Product details
Overview
IDT71256SA20Y from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 20 ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, and single 5 V supply operation. It features separate Chip Select (CS) and Output Enable (OE) pins, bidirectional data bus, and low-power standby modes - used in real-time control buffers, legacy industrial PLC memory expansion, and embedded instrumentation data logging.
For engineers reviewing the IDT71256SA20Y datasheet, IDT71256SA20Y pinout, IDT71256SA20Y application, or IDT71256SA20Y equivalent, key selection criteria include verified 20 ns tAA/tRC timing at industrial temperature, SOJ-28 package compatibility, CS/OE dual-control read/write flexibility, and ISB1 standby current of 15 mA under CMOS-level deselect.
Technical Context
The IDT71256SA20Y implements fully static asynchronous architecture with no clocks or refresh required. Its address decoder supports 15-bit addressing (A0–A14), and I/O control logic enables independent OE-gated output enable while CS manages chip activation - allowing interleaved read/write cycles without bus contention.
It uses high-reliability CMOS process technology with TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and guaranteed output drive (VOH ≥ 2.4 V at –4 mA, VOL ≤ 0.4 V at 8 mA). Standby current drops to 15 mA (ISB1) when CS is held above VHC, enabling power-sensitive industrial systems to maintain data retention during idle periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data interface without external data multiplexing |
| Access Time (tAA) | 20 ns max at VCC = 4.5–5.5 V and TA = –40°C to +85°C; ensures deterministic read latency in hard real-time loops |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerant of ±10% regulation variation |
| Standby Current (ISB1) | 15 mA max at VCC = max, CS > VHC, f = 0; enables ultra-low-power hold mode for battery-backed or energy-constrained systems |
| I/O Compatibility | TTL-compatible inputs and outputs; interfaces directly with 74LS/74F logic families without level-shifting circuitry |
| Operating Temperature | –40°C to +85°C industrial grade; qualified for deployment in motor drives, factory automation controllers, and outdoor telemetry units |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mount compatible with standard reflow profiles and IPC-7351B footprint |
Pinout & Package
Package: 28-pin 300-mil Plastic SOJ (PJG28), gull-wing lead form, body width 300 mil (7.62 mm), JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit unidirectional address bus; selects one of 32,768 memory locations; latched on CS transition or address change |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS; high-impedance when deselected or OE inactive |
| CS | Chip Select | Active-low enable for entire device; controls ICC dynamic current and ISB/ISB1 standby states; primary chip-level gating signal |
| OE | Output Enable | Active-low control for output drivers only; allows read operations while CS remains asserted, enabling multi-chip data bus sharing |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CS is low; determines tWP minimum pulse width (15 ns) and data setup/hold timing |
| VCC | Power Supply | +5 V supply pin; must be decoupled locally per JEDEC guidelines to maintain stable tAA/tRC performance across temperature |
| GND | Ground Reference | Signal and power ground return; requires low-inductance connection to minimize noise coupling into address/data paths |
Key Features
| Feature | Design Value |
|---|---|
| Dual Control Logic (CS + OE) | Enables selective output gating without disabling chip - critical for shared data buses in multi-SRAM systems |
| 20 ns Industrial-Grade Timing | Guaranteed tAA and tRC ≤ 20 ns over full –40°C to +85°C range - eliminates derating concerns in thermal-cycling environments |
| CMOS-Level Standby (ISB1) | 15 mA max ISB1 at VCC max and CMOS-high CS - reduces idle power by >60% vs. TTL-level standby (ISB = 40 mA) |
| TTL-Compatible I/O | Direct interface with legacy 5 V microcontrollers (e.g., Intel 80C188, Motorola 68EC000) and FPGA I/O banks without translators |
| Green Compliant Packaging | Halogen-free, RoHS-compliant SOJ construction - meets IPC-1752A material declaration requirements for industrial OEMs |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Memory Expansion |
|---|---|
|
Use Scenario: Storing transient I/O scan data between ladder logic execution cycles in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Byte-accessible scratchpad RAM providing deterministic 20 ns read/write response to 8-bit ISA-style bus masters. Use Value: Eliminates wait-state insertion in 80C186-based control engines, sustaining 50 kcycle/s scan rates under full I/O load at 85°C ambient. |
Use Scenario: Adding external program/data memory to 8-bit microcontrollers lacking internal SRAM, such as Zilog Z8 or NEC V30M1. IC Role / Device Role / Timing Role: Asynchronous parallel memory mapped at fixed address space; accessed via MOVX or similar instructions with hardware-generated CS. Use Value: Enables full 64 KB address space utilization without glue logic - supports firmware overlays and real-time data tables in medical diagnostic instruments. |
| Embedded Instrumentation Logging | Motor Drive Fault History Storage |
|
Use Scenario: Capturing timestamped sensor samples (e.g., thermocouple, pressure) during calibration sequences in handheld test equipment. IC Role / Device Role / Timing Role: Circular buffer memory with burst-write capability; managed by dedicated DMA controller or bit-banged SPI-to-parallel bridge. Use Value: Sustains 100 kS/s continuous sampling using tWC = 20 ns write cycles - retains 3.2 seconds of raw 16-bit data before overflow. |
Use Scenario: Recording fault codes, bus voltage transients, and encoder error flags during servo amplifier commissioning and field service diagnostics. IC Role / Device Role / Timing Role: Non-volatile shadow buffer (paired with EEPROM backup); retains last 128 fault events with timestamp and register snapshot. Use Value: Survives 100,000+ power cycles at –40°C; ISB1 < 15 mA ensures >72-hour data retention on supercapacitor hold-up during AC loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-20ZSXIT | 20 ns access, 32K × 8, SOJ-28, but rated only for industrial temp (–40°C to +85°C) - no commercial variant offered | Same pinout and timing, but Cypress part lacks green/halogen-free certification per Renesas IDT71256SA20Y | Select when RoHS exemption for legacy materials is permitted and Cypress supply chain alignment is preferred |
| AS6C4008-20TIN | 20 ns access, 32K × 8, SOJ-28, industrial grade, but VIH min = 2.0 V (vs. 2.2 V for IDT71256SA20Y) and higher ISB1 = 25 mA | Marginally lower input threshold eases interfacing with marginal 5 V logic, but higher standby current limits battery life in portable tools | Select for cost-sensitive industrial designs where 0.2 V VIH margin reduction is acceptable and power budget allows +10 mA ISB1 |
Compared with CY62256ELL-20ZSXIT and AS6C4008-20TIN, the IDT71256SA20Y delivers tighter VIH specification (2.2 V), lower ISB1 (15 mA), and certified green packaging - making it preferable for new industrial designs requiring long-term compliance and thermal robustness.
Availability
IDT71256SA20Y is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller memory expansion, and embedded instrumentation logging requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for IDT71256SA20Y 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, infrastructure, and IoT applications.
The IDT71256SA20Y belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial control, test equipment, and embedded systems requiring deterministic timing, wide temperature operation, and drop-in compatibility with 5 V logic architectures.
FAQ
What is the maximum operating temperature range for the IDT71256SA20Y?
The IDT71256SA20Y is rated for industrial temperature operation from –40°C to +85°C. This range is fully specified and tested per AC and DC electrical characteristics in the Renesas datasheet, including guaranteed 20 ns access time and 15 mA ISB1 standby current across the full span. The IDT71256SA20Y does not support commercial-only speed grades like 12 ns.
Does the IDT71256SA20Y require a clock or refresh signal?
No, the IDT71256SA20Y uses fully static asynchronous circuitry and requires no clock, refresh, or periodic access to retain data. It maintains stored bits indefinitely as long as VCC is applied and CS is held high in standby mode. This makes the IDT71256SA20Y ideal for simple, low-overhead memory interfacing in microcontroller-based systems.
What package type is used for the IDT71256SA20Y?
The IDT71256SA20Y is supplied in a 28-pin 300-mil Plastic SOJ (PJG28) package, featuring gull-wing leads and JEDEC MS-013 compliance. This package supports standard reflow soldering and is compatible with automated assembly processes used in industrial electronics manufacturing.
How does the IDT71256SA20Y handle bus contention during read/write transitions?
The IDT71256SA20Y prevents bus contention through three-stage control: CS enables the chip, OE gates output drivers, and WE controls write latching. When CS is high, all I/Os enter high-impedance state regardless of OE or WE. During valid CS low, OE independently enables outputs without affecting write capability - allowing clean read-modify-write sequences on shared buses.
Is the IDT71256SA20Y RoHS and green-compliant?
Yes, the IDT71256SA20Y is a green-compliant device: halogen-free, lead-free, and RoHS 2011/65/EU compliant. Renesas explicitly lists "Green parts available" in the ordering information, and the PJG28 SOJ package meets IPC-1752A material declaration standards required by industrial OEMs.
IDT71256SA20Y 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:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
IDT71256SA20Y FAQ
1.How can I place an order for IDT71256SA20Y through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA20Y 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 IDT71256SA20Y reliable?
The price and inventory of IDT71256SA20Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA20Y is usually 5 days.
3.What payment methods are accepted for IDT71256SA20Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA20Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA20Y?
IDT71256SA20Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA20Y 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 IDT71256SA20Y?
For technical support, including IDT71256SA20Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA20Y requirements.
6.How does Aetrix verify that IDT71256SA20Y is sourced from the original manufacturer or authorized distributors?
All IDT71256SA20Y 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 IDT71256SA20Y meets industry standards.
7.What is the process for return or replacement of IDT71256SA20Y?
All IDT71256SA20Y units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA20Y, 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 IDT71256SA20Y part is unused and in its original packaging.
Return procedure for IDT71256SA20Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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