仕様
| 属性 | 値 |
| Supplier | Renesas Electronics America Inc |
| Package / Case | Tube |
| Part Status | Obsolete |
| Memory Type | Volatile |
| Memory Format | SRAM |
| Technology | SRAM - Asynchronous |
| Memory Size | 256Kb (32K x 8) |
| Memory Interface | Parallel |
| Write Cycle Time - Word Page | 20ns |
| Access Time | 20 ns |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount |
概要
Description
IDT71256SA20Y is a static RAM (SRAM) from Integrated Device Technology. It stores 256 kilobits, organized as 32K × 8, and typically runs at 20 ns. Supply voltage is usually 5 V (TTL-compatible I/O). The device comes in a 28-pin package (DIP or SOIC) with address inputs A0–A14, data I/O DQ0–DQ7, and control pins CE#, OE#, WE# (all active-low).
Operation is asynchronous:
- Read: CE# = OE# = low, data appears on DQ after ~20 ns.
- Write: CE# = WE# = low with valid address/data, data is stored during the write window.
Common uses include fast local RAM for microprocessors, caches, buffers, and test equipment. The “SA20Y” suffix typically denotes a speed grade of 20 ns and packaging/temperature options; check the exact datasheet for voltage, temperature range, and pinout for your specific package.
Operation is asynchronous:
- Read: CE# = OE# = low, data appears on DQ after ~20 ns.
- Write: CE# = WE# = low with valid address/data, data is stored during the write window.
Common uses include fast local RAM for microprocessors, caches, buffers, and test equipment. The “SA20Y” suffix typically denotes a speed grade of 20 ns and packaging/temperature options; check the exact datasheet for voltage, temperature range, and pinout for your specific package.
Features
IDT71256SA20Y features (concise):
- 256 Kb SRAM (32K × 8 organization)
- 5V CMOS operation (approx. 4.5–5.5V)
- Access time: 20 ns (SA20)
- 3-state outputs; asynchronous read/write
- Two chip-enable/CE inputs plus OE/WE for flexible interfacing
- Low-power standby when deselected
- Packages: 28-pin DIP and surface-mount (SOIC); various package options
- Temperature variants: commercial and industrial (e.g., 0–70°C and -40–85°C)
Common uses: caches, buffers, video/data buffers, and general SRAM storage. Note: exact voltage, current, and temperature specs may vary by package/lot—verify the specific datasheet for your variant.
- 256 Kb SRAM (32K × 8 organization)
- 5V CMOS operation (approx. 4.5–5.5V)
- Access time: 20 ns (SA20)
- 3-state outputs; asynchronous read/write
- Two chip-enable/CE inputs plus OE/WE for flexible interfacing
- Low-power standby when deselected
- Packages: 28-pin DIP and surface-mount (SOIC); various package options
- Temperature variants: commercial and industrial (e.g., 0–70°C and -40–85°C)
Common uses: caches, buffers, video/data buffers, and general SRAM storage. Note: exact voltage, current, and temperature specs may vary by package/lot—verify the specific datasheet for your variant.
Pinout
- Pin count: 28 pins (DIP/SOIC).
- Function: 32K × 8-bit static RAM (256 Kbit) with asynchronous read/write; address inputs A0–A14, data I/O DQ0–DQ7, control pins CS, OE, WE, plus Vcc and GND.
- Function: 32K × 8-bit static RAM (256 Kbit) with asynchronous read/write; address inputs A0–A14, data I/O DQ0–DQ7, control pins CS, OE, WE, plus Vcc and GND.
Manufacturer
Manufacturer: Integrated Device Technology (IDT). Type of company: a semiconductor company that designs and manufactures integrated circuits (memory, logic, timing, and mixed-signal ICs); IDT is now a subsidiary of Renesas Electronics Corporation.
Application
IDT71256SA20Y is a 32K × 8 bit static RAM (20 ns access). Common application areas:
- Main memory for microprocessors and DSPs
- Data buffers and caches
- Video/frame-buffer memory for displays
- Graphics/image processing buffers
- Telecommunications data buffering
- Look-up tables and register files
- Real-time data acquisition/instrumentation systems
- Industrial controllers and embedded systems
It serves as fast, low‑voltage memory in embedded and digital systems.
- Main memory for microprocessors and DSPs
- Data buffers and caches
- Video/frame-buffer memory for displays
- Graphics/image processing buffers
- Telecommunications data buffering
- Look-up tables and register files
- Real-time data acquisition/instrumentation systems
- Industrial controllers and embedded systems
It serves as fast, low‑voltage memory in embedded and digital systems.
Package
The IDT71256SA20Y uses a 28-pin package, typically DIP-28 or SO-28 (plastic).
