規格
| 屬性 | 價值 |
| Supplier | Alliance Memory, Inc. |
| Package / Case | Tube |
| Part Status | Discontinued at Digi-Key |
| Memory Type | Volatile |
| Memory Format | SRAM |
| Technology | SRAM - Asynchronous |
| Memory Size | 256Kb (32K x 8) |
| Memory Interface | Parallel |
| Write Cycle Time - Word Page | 15ns |
| Access Time | 15 ns |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
概述
Description
AS7C256B-15JIN is a high-speed static RAM (SRAM) from Alliance Memory. It provides 256K × 8 bits of random-access storage (about 2 Mbits total) with an access time of 15 ns. It operates from a single 3.3 V supply (typical range roughly 2.7–3.6 V) and comes in a 32-pin package with J‑lead (JIN) style. It uses 18 address lines (A0–A17), 8 data I/O lines (DQ0–DQ7), and standard control pins (/CE, /OE, /WE); outputs are tri‑state. The device is fully static—no clocking required—with low-power standby when /CE is high. Applications include fast data buffering, caches, frame buffers, and general embedded-memory tasks requiring rapid, random access. For exact electrical specs, pinout, and timing diagrams, consult the official Alliance Memory datasheet.
Equivalent
AS7C256B-15JIN is a 256-kbit (32K×8) asynchronous SRAM. Equivalents depend on package, voltage and temperature. Please specify: package (SOIC-8/TSSOP-8), operating voltage, speed grade, and temperature range (Commercial/Industrial). With that, I can provide exact cross-references (e.g., Cypress CY7C256 series, ISSI IS61WV256, Renesas equivalents).
Features
AS7C256B-15JIN is a 256-kbit static RAM. Key features:
- Organization: 32K × 8 (256K bits)
- Access time: 15 ns
- Voltage: 2.7–3.6 V (3.3 V nominal)
- Package: 28-pin, RoHS-compliant (-JIN code)
- Interface: asynchronous read/write with three-state I/O
- Control pins: Chip Enable (CE), Output Enable (OE), Write Enable (WE)
- Fully static memory; no clock or refresh required
- Low-power operation with standby modes
- Wide operating/industrial temperature options (per grade)
- High write/read endurance typical for SRAMs (no refresh required)
Note: exact Icc (active/standby) and temperature range depend on the specific grade/datecode.
- Organization: 32K × 8 (256K bits)
- Access time: 15 ns
- Voltage: 2.7–3.6 V (3.3 V nominal)
- Package: 28-pin, RoHS-compliant (-JIN code)
- Interface: asynchronous read/write with three-state I/O
- Control pins: Chip Enable (CE), Output Enable (OE), Write Enable (WE)
- Fully static memory; no clock or refresh required
- Low-power operation with standby modes
- Wide operating/industrial temperature options (per grade)
- High write/read endurance typical for SRAMs (no refresh required)
Note: exact Icc (active/standby) and temperature range depend on the specific grade/datecode.
Pinout
- Pin count: 8 pins (SOP-8, package code JIN)
- Function: 256-kbit serial non-volatile memory (EEPROM) accessible via a serial interface (I2C).
- Function: 256-kbit serial non-volatile memory (EEPROM) accessible via a serial interface (I2C).
Manufacturer
Manufacturer: Alliance Memory, Inc.
What kind of company: A US-based memory semiconductor company (fabless) that designs and markets SRAM/DRAM products and outsources fabrication to independent foundries.
What kind of company: A US-based memory semiconductor company (fabless) that designs and markets SRAM/DRAM products and outsources fabrication to independent foundries.
Application
AS7C256B-15JIN is a 256 Kbit (32K × 8) static RAM with 15 ns access time. Typical applications include:
- Embedded systems as working RAM for MCUs/SoCs
- High-speed data buffering and caching in digital interfaces (UART, USB, Ethernet) and DSP
- Frame buffers and graphics memory for small displays
- Data acquisition, signal processing, and test/measurement equipment as scratchpad storage
- Industrial automation controllers and automotive ECUs for real-time data logging
- Networking gear for packet buffering and inter-CPU data exchange
- Embedded systems as working RAM for MCUs/SoCs
- High-speed data buffering and caching in digital interfaces (UART, USB, Ethernet) and DSP
- Frame buffers and graphics memory for small displays
- Data acquisition, signal processing, and test/measurement equipment as scratchpad storage
- Industrial automation controllers and automotive ECUs for real-time data logging
- Networking gear for packet buffering and inter-CPU data exchange
Package
28-pin Small Outline Package (SOIC/SOP).
