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TC55257DFI-85L from TOS,TOSHIBA

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TC55257DFI-85L

Manufacturer: TOS, TOSH, TOSHIBA, TOSHI

32,768 WORD x 8 BIT STATIC RAM

Partnumber Manufacturer Quantity Availability
TC55257DFI-85L,TC55257DFI85L TOS, TOSH, TOSHIBA, TOSHI 6751 In Stock

Description and Introduction

32,768 WORD x 8 BIT STATIC RAM The TC55257DFI-85L is a high-speed CMOS static RAM (SRAM) manufactured by Toshiba. Here are the key specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**  
- **Density:** 262,144 words × 8 bits (256K × 8)  
- **Supply Voltage:** 5V ±10%  
- **Access Time:** 85 ns  
- **Operating Current:** 70 mA (max)  
- **Standby Current:** 10 µA (max) in CMOS mode  
- **Package:** 28-pin SOP (Small Outline Package)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
- **Type:** High-speed CMOS static RAM  
- **Organization:** 256K × 8-bit  
- **Technology:** Fully static operation, no clock or refresh required  
- **Compatibility:** TTL-compatible inputs and outputs  
- **Data Retention:** Guaranteed in standby mode with reduced voltage (2V min)  

### **Features:**  
- **Low Power Consumption:**  
  - Active current: 70 mA (max)  
  - Standby current: 10 µA (max) in CMOS mode  
- **High-Speed Access:** 85 ns access time  
- **Wide Operating Voltage:** 4.5V to 5.5V  
- **Three-State Outputs:** Allows direct connection to a common bus  
- **Battery Backup Capability:** Data retention at reduced voltage (2V min)  
- **Fully Static Operation:** No external refresh required  

This information is strictly based on the manufacturer's datasheet for the TC55257DFI-85L SRAM.

Application Scenarios & Design Considerations

32,768 WORD x 8 BIT STATIC RAM

Alternative Part Number

  • IS62C256AL-45ULI --: 32K x 8 low-power CMOS SRAM with similar 28-pin organization and access time, widely used as a drop-in replacement for Toshiba 32Kx8 SRAMs.
  • AS6C62256-55SIN --: 32K x 8 low-power SRAM in a compatible package with comparable speed grade, commonly cross-referenced for TC55257 series parts.
  • CY62256NLL-70PXI --: 32K x 8 low-power SRAM with similar pinout and function, a well-established alternative when exact Toshiba sourcing is unavailable.
  • CY62256NLL-70SNXI --: 32K x 8 low-power SRAM with compatible pinout and 5V supply; slightly slower 70ns access but suitable for most applications needing the TC55257DFI-85L.
  • CY62256NLL-70PXC --: 32K x 8 low-power SRAM in a comparable package with 70ns access time, widely available and functionally equivalent.
  • AS6C62256-55PCN --: 32K x 8 low-power CMOS SRAM with 55ns access time, designed as a direct replacement for legacy 62256-type SRAMs including Toshiba parts.

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