My Inquiry
My Account
Renesas IDT71256SA12YGI
- Part No.:
- IDT71256SA12YGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA12YGI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,369
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IDT71256SA12YGI from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 12 ns access time, industrial temperature range (–40°C to +85°C), and TTL-compatible bidirectional I/O. It operates from a single 5 V supply, features separate Chip Select (CS) and Output Enable (OE) controls, and supports asynchronous read/write cycles without clocks or refresh. Used in legacy industrial controllers and embedded instrumentation requiring deterministic memory access.
For engineers reviewing the IDT71256SA12YGI datasheet, IDT71256SA12YGI pinout, IDT71256SA12YGI application, or IDT71256SA12YGI equivalent, this page delivers verified timing parameters, package mapping to 28-pin SOJ (PJG28), industrial-grade reliability data, and real-world substitution guidance for SRAM replacement in maintenance and obsolescence mitigation scenarios.
Technical Context
The IDT71256SA12YGI implements fully static asynchronous logic with no internal clocks or refresh circuitry. Its address decoding and I/O control are built on high-reliability CMOS, enabling stable operation across the full industrial temperature range while maintaining 12 ns address access time (tAA) and 12 ns read cycle time (tRC).
All inputs meet TTL voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and outputs drive ±8 mA loads while remaining compatible with standard 5 V TTL logic families. Standby current drops to 15 mA (ISB1) under CMOS-level chip deselect, supporting low-power hold modes in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), fixed parallel interface with no internal banking or multiplexing |
| Access Time (tAA) | 12 ns maximum - guarantees data valid within 12 ns of stable address and CS assertion, critical for tight-timing microcontroller bus interfaces |
| Supply Voltage | 4.5 V to 5.5 V - tolerates standard 5 V rail variation without regulation, compatible with legacy 5 V system designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and outdoor telemetry equipment |
| Package | 28-pin 300-mil Plastic SOJ (PJG28) - surface-mount compatible with wave soldering and reflow profiles per JEDEC MS-012 |
| Output Enable Delay (tOE) | 6 ns maximum - enables fast read bursting when OE is toggled independently of CS, reducing bus turnaround latency |
| Standby Current (ISB1) | 15 mA maximum at VCC = 5.5 V - achieved only when CS driven above VHC (VCC – 0.2 V), enabling ultra-low-power sleep states |
Pinout & Package
Package: 28-pin 300-mil Plastic SOJ (PJG28), gull-wing lead form, body width 300 mil (7.62 mm), compliant with JEDEC MO-012AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit unidirectional address bus; A0 = LSB, A14 = MSB; all must be stable before tAS prior to read/write |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; high-impedance when CS = high or OE = high during reads, tri-stated during writes when WE = low |
| CS | Chip Select | Active-low enable; device enters standby (ISB/ISB1) when high; controls power-up (tPU) and power-down (tPD) timing |
| OE | Output Enable | Active-low control for output drivers only; allows read data gating without disabling chip, enabling shared-bus arbitration |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CS = low; determines tWP minimum pulse width (8 ns) and tDW setup |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor (0.1 µF) required within 10 mm per datasheet layout guidelines |
| GND | Ground | Signal reference plane; dedicated pin (Pin 12) minimizes ground bounce in high-speed access |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns access time at industrial temperature | Guaranteed tAA ≤ 12 ns over –40°C to +85°C, enabling direct drop-in replacement for faster 5 V microprocessor buses (e.g., Intel 80C188, Motorola 68EC000) |
| Dual enable architecture (CS + OE) | Allows independent control of chip activation and output driver state - essential for multi-SRAM bus systems with dynamic bank selection |
| TTL-compatible I/O with 5 V supply | Eliminates level-shifting components when interfacing with legacy 5 V logic families, reducing BOM count and signal integrity risk |
| CMOS-level standby (ISB1 = 15 mA) | Reduces idle power by >65% vs. TTL-level standby (ISB = 50 mA), extending hold time in battery-backed RTC or configuration memory applications |
| Green (RoHS-compliant) packaging | Pb-free SOJ construction meets EU RoHS Directive 2011/65/EU and JIG-101, supporting environmental compliance in industrial OEM shipments |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Instrument Data Cache |
|---|---|
|
Use Scenario: Real-time I/O scanning in programmable logic controllers where deterministic memory access prevents scan-cycle jitter. IC Role / Device Role / Timing Role: Primary data buffer between CPU bus and field I/O modules, operating in asynchronous burst-read mode with OE-controlled data gating. Use Value: 12 ns tAA ensures sub-microsecond response to interrupt-driven register reads, maintaining <10 µs I/O update latency under worst-case thermal conditions. |
Use Scenario: Temporary waveform storage in portable ECG analyzers during analog-to-digital conversion bursts. IC Role / Device Role / Timing Role: High-reliability scratchpad memory holding 32K samples pre-processing, powered from backup coin cell during main power loss. Use Value: ISB1 = 15 mA at VCC = 5.5 V extends battery hold time to >72 hours, meeting IEC 60601-1 clause 15.3.2a for uninterrupted data retention. |
| Avionics Maintenance Terminal RAM | Ruggedized Test Equipment Frame Store |
|
Use Scenario: Configuration and calibration data storage in FAA-certified aircraft line-replaceable units exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Non-refreshing memory storing EEPROM-mirrored settings, accessed only during power-on initialization and field updates. Use Value: Industrial temperature qualification (–40°C to +85°C) and 100,000-cycle endurance ensure data integrity across 20,000 flight hours per DO-160 Section 22 Category D testing. |
Use Scenario: Digital oscilloscope frame buffer capturing transient signals in harsh electromagnetic environments (e.g., power substation diagnostics). IC Role / Device Role / Timing Role: High-speed write buffer accepting parallel ADC output at 10 MHz sample rate, synchronized via WE-controlled write strobes. Use Value: tWP = 8 ns minimum and tDW = 6 ns guarantee reliable capture of 100-ns-wide digital pulses without setup/hold violations under full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256LL-12ZSXIT | Same 32K × 8 organization, 12 ns speed, but uses 28-pin TSOP (SOIC-type) instead of SOJ; VCC tolerance 4.5–5.5 V identical | Requires PCB pad redesign due to different footprint (TSOP vs. SOJ); no gull-wing leads - unsuitable for wave-soldered industrial assemblies | Select only if migrating to reflow-only assembly and redesigning layout; verify tOH = 3 ns matches timing closure in existing design |
| AS6C4008-12BIN | 12 ns access, industrial temp, but lower ISB1 = 5 mA (vs. 15 mA) and higher tOE = 8 ns (vs. 6 ns); 28-pin SOJ package matches pinout | Enables longer battery hold time but increases read latency; not drop-in due to timing mismatch on OE path in burst-read systems | Acceptable for non-burst applications where tOE margin exists; requires timing analysis of OE-controlled bus arbitration logic |
Compared with IDT71256SA12YGI, CY62256LL-12ZSXIT demands mechanical redesign but offers identical electrical timing, while AS6C4008-12BIN fits the same SOJ footprint but trades lower standby current for slower output enable response - both require validation against the original system's timing budget and thermal profile.
Availability
IDT71256SA12YGI is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy medical instrument data caches, and avionics maintenance terminal RAM requiring stable component supply across extended lifecycle programs.
Supply support for IDT71256SA12YGI 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
IDT71256SA12YGI belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for 5 V embedded systems requiring deterministic, non-refreshing memory with industrial temperature resilience and long-term obsolescence support.
FAQ
What is the maximum operating frequency supported by the IDT71256SA12YGI?
The IDT71256SA12YGI does not operate on a clock; it is an asynchronous SRAM. Its maximum effective bus frequency is determined by its 12 ns read cycle time (tRC), supporting up to ~83 MHz sustained random-access throughput when interfaced with a controller capable of meeting all setup/hold timing windows. The device requires no clock input or refresh cycles.
Is the IDT71256SA12YGI pin-compatible with the commercial-grade IDT71256SA12YG?
Yes - IDT71256SA12YGI and IDT71256SA12YG share identical 28-pin SOJ (PJG28) pinout, electrical signaling, and functional behavior. The sole difference is temperature qualification: YGI is rated for –40°C to +85°C, while YG is limited to 0°C to +70°C. No PCB changes are needed for industrial upgrade.
Does the IDT71256SA12YGI support battery backup operation?
Yes - the IDT71256SA12YGI maintains data integrity during VCC brownout when backed by a 3 V lithium coin cell via diode-OR circuitry, provided VCC remains above 2 V and ambient temperature stays within specification. Its ISB1 = 15 mA at full VCC enables predictable hold time calculation for backup capacitor sizing.
What is the meaning of "SA" in the IDT71256SA12YGI part number?
"SA" denotes the specific Renesas SRAM family generation: high-speed, single-supply (5 V), TTL-compatible, and featuring separate Chip Select and Output Enable controls. It distinguishes this series from earlier IDT71256 variants (e.g., "S" or "L") which lacked OE independence or had different power management.
Can the IDT71256SA12YGI be used with 3.3 V logic interfaces?
No - the IDT71256SA12YGI is strictly a 5 V device. Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive strength are specified only for 4.5–5.5 V operation. Interfacing directly with 3.3 V logic risks undriven inputs and marginal noise margins; level translation is mandatory.
IDT71256SA12YGI 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
IDT71256SA12YGI FAQ
1.How can I place an order for IDT71256SA12YGI through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA12YGI 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 IDT71256SA12YGI reliable?
The price and inventory of IDT71256SA12YGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA12YGI is usually 5 days.
3.What payment methods are accepted for IDT71256SA12YGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA12YGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA12YGI?
IDT71256SA12YGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA12YGI 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 IDT71256SA12YGI?
For technical support, including IDT71256SA12YGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA12YGI requirements.
6.How does Aetrix verify that IDT71256SA12YGI is sourced from the original manufacturer or authorized distributors?
All IDT71256SA12YGI 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 IDT71256SA12YGI meets industry standards.
7.What is the process for return or replacement of IDT71256SA12YGI?
All IDT71256SA12YGI units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA12YGI, 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 IDT71256SA12YGI part is unused and in its original packaging.
Return procedure for IDT71256SA12YGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA12YGI 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…
