3.3 VOLT TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256 The IDT72V8985J is a high-speed 3.3V CMOS synchronous FIFO memory device manufactured by Integrated Device Technology (IDT). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Organization:** 256K x 36 (9,437,184 bits)
- **Operating Voltage:** 3.3V ±10%
- **Speed Grades:** 100 MHz, 133 MHz, 166 MHz, 200 MHz
- **Access Time:** 5.0 ns (200 MHz)
- **Cycle Time:** 5.0 ns (200 MHz)
- **Power Consumption:**
- Active: 1.5W (typical)
- Standby: 0.5W (typical)
- **I/O Interface:** LVTTL-compatible
- **Operating Temperature Range:** Commercial (0°C to +70°C) / Industrial (-40°C to +85°C)
- **Package:** 120-pin TQFP (Thin Quad Flat Pack)
### **Descriptions:**
- The IDT72V8985J is a synchronous FIFO (First-In, First-Out) memory designed for high-speed data buffering applications.
- It supports independent read and write clocks, enabling seamless data transfer between asynchronous systems.
- Features programmable almost-full and almost-empty flags for efficient data flow control.
- Includes retransmit capability, allowing data to be reread from the beginning of the FIFO.
### **Features:**
1. **High-Speed Operation:** Supports clock frequencies up to 200 MHz.
2. **Synchronous Operation:** Read and write operations synchronized to independent clocks.
3. **Programmable Flags:**
- Almost-Full (AF) and Almost-Empty (AE) flags with user-selectable offsets.
- Full (FF) and Empty (EF) flags for precise FIFO status monitoring.
4. **Retransmit Function:** Allows re-reading data from the start of the FIFO without resetting.
5. **Bypass Mode:** Enables direct data transfer from input to output for testing.
6. **Low Power Consumption:** Optimized for 3.3V operation with standby power-saving modes.
7. **JTAG Boundary Scan:** Supports IEEE 1149.1-compliant boundary scan for testing.
8. **LVTTL-Compatible I/Os:** Ensures compatibility with standard logic levels.
This FIFO is commonly used in networking, telecommunications, and high-performance computing applications where high-speed data buffering is required.
