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AS7C256B-15JIN

Name: AS7C256B-15JIN
Rating: 4.7 (12 reviews)

IC SRAM 256KBIT PARALLEL 28SOJ

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Mfr。パート #AS7C256B-15JIN
パッケージ 28-BSOJ (0.300, 7.62mm Width)
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仕様

Supplier	Alliance Memory, Inc.
Package	Tube
ProductStatus	Discontinued at Digi-Key
MemoryType	Volatile
MemoryFormat	SRAM
Technology	SRAM - Asynchronous
MemorySize	256Kb (32K x 8)
MemoryInterface	Parallel
WriteCycleTime-WordPage	15ns
AccessTime	15 ns
Voltage-Supply	4.5V ~ 5.5V
OperatingTemperature	-40°C ~ 85°C (TA)
MountingType	Surface Mount
Package/Case	28-BSOJ (0.300, 7.62mm Width)

概要

Description

AS7C256B-15JIN is a 256‑Kbit SPI‑Serial Flash memory from Alliance Memory. It’s designed to store firmware and data in embedded systems with a small, low‑pin footprint.
Key features
- Capacity and organization: 256 Kbit organized as 32K × 8 bits
- Interface: SPI-compatible 8‑pin package (RoHS JIN lead-free)
- Voltage and speed: typically 2.7–3.6 V supply; up to 15 MHz clock (single‑SPI)
- Memory operations: Read/Fast Read, Page Program (up to 256 bytes), Sector Erase (commonly 4 KB sectors), Chip Erase
- Control: Write Enable/Disable, Read/Write Status Register, WIP bit monitoring
- Power modes: normal and Deep Power-Down for low power
- Applications: boot firmware, code shadowing, data logging, firmware updates
- Packaging: 8‑pin small outline package suitable for compact PCBs
Notes
- Exact timing, sector size, and voltage range should be verified in the datasheet for your revision and operating conditions.

Features

AS7C256B-15JIN is a 256K-bit static RAM. Key features:
- Density/organization: 32K x 8 (256K bits)
- Speed: 15 ns access time
- Interface: asynchronous SRAM with separate CS (CE), OE, and WE
- I/O: 3-state bidirectional data I/O
- Supply voltage: single 2.7V–3.6V operation
- Power: standby/power-down when CS is inactive (low power)
- Temperature: industrial range typically -40°C to 85°C
- Packaging: JIN code (standard SRAM package)
Applications: general-purpose memory, buffers, caches, and other data-storage needs requiring fast, low-power static RAM.

Package

8-pin small-outline package (SOIC), i.e., an 8‑pin SOP/SOIC package.

Pinout

Pin count: 32 pins.
Function: 256K × 8-bit CMOS static RAM (SRAM) with asynchronous read/write. Uses A0–A17 for addresses, DQ0–DQ7 for data, and CE (chip enable), OE (output enable), and WE (write enable) as control inputs, plus Vcc and GND. The -15 indicates a 15 ns speed grade.

Manufacturer

Manufacturer: Alliance Memory.
Alliance Memory is a semiconductor company that designs and markets memory integrated circuits (SRAM/DRAM). It is a fabless memory-focused company.

Application

AS7C256B-15JIN is a 256 Kb static RAM (32K × 8) with 15 ns access time. Suitable for:
- General-purpose RAM in embedded microcontroller/processor systems
- Cache/scratchpad memory and data buffers
- Frame/graphics buffers and display memory
- Data-acquisition, DSP buffering, and audio/video processing
- Networking/telecom buffers and temporary storage
- Automotive/industrial controllers needing fast, reliable RAM
- Prototyping and portable devices requiring quick random-access memory

Equivalent

AS7C256B-15JIN is Alliance Memory’s 32K×8 CMOS SRAM (256 Kb) with 15 ns timing. Exact equivalents depend on package/pinout. Common cross-references from other vendors include 32K×8 SRAMs at 15 ns (e.g., Cypress CY7C256 and various ISSI/Winbond parts). For precise part numbers, use a distributor’s cross-reference tool (Digi-Key/Mouser) or share package/temperature details and I can fetch current equivalents.