256-MBit Synchronous DRAM The part **HYB39S256160DT-7.5** is a **256Mb (16M x 16) Synchronous DRAM (SDRAM)** manufactured by **Infineon Technologies (formerly under the HYB prefix)**. Below are its specifications, descriptions, and features:
### **Specifications:**
- **Organization:** 16M words × 16 bits
- **Density:** 256 Megabits (32 Megabytes)
- **Voltage Supply:** 3.3V (±0.3V)
- **Speed Grade:** **-7.5** (7.5ns access time, 133MHz clock frequency)
- **Package:** 54-pin TSOP-II (Thin Small Outline Package)
- **Refresh Cycles:** 4096 refresh cycles every 64ms
- **Burst Length:** Programmable (1, 2, 4, 8, or full page)
- **CAS Latency (CL):** 2 or 3 cycles
- **Operating Temperature Range:** Commercial (0°C to +70°C) or Industrial (-40°C to +85°C)
### **Descriptions:**
- **Type:** Synchronous DRAM (SDRAM) with a fully synchronous operation.
- **Interface:** Supports a high-speed system clock with pipelined architecture.
- **Applications:** Used in networking, telecommunications, and computing systems requiring high-speed memory.
### **Features:**
- **Synchronous Operation:** Clocked at 133MHz (7.5ns cycle time).
- **Auto Refresh & Self Refresh:** Supports power-saving modes.
- **Programmable Burst Length:** Allows flexible data access.
- **Single 3.3V Power Supply:** Low power consumption.
- **Four Internal Banks:** Enables concurrent operations.
- **Double Data Rate (DDR) Compatibility:** Not applicable (this is an SDR SDRAM).
- **On-Die Termination (ODT):** Not supported (older SDRAM technology).
This part is now considered legacy, as newer DDR SDRAMs have replaced it in modern applications.
