Unisem X28HC256FI-90, 256Kbit parallel EEPROM (32K x 8), 90 ns access time, 4.5 V supply, 5 ms write cycle, surface-mount 28-pin flat package, -40°C to 85°C.
| Parameter | Value |
|---|---|
| Interface | Parallel |
| Mounting | Surface Mount |
| Operating temperature high | -40°C to 85°C(TA) |
| Frame_size | 256Kbit |
| Access time | 90 ns |
| Memory type | Non-Volatile |
| Package_type | Bulk |
| Memory format | EEPROM |
| Supply voltage | 4.5 |
| Memory organization | 32K x 8 |
| Write cycle time - word, page | 5ms |
The Unisem X28HC256FI-90 is a 256 Kbit parallel EEPROM organized as 32K x 8, with a 90 ns access time and a 4.5 V nominal supply. It uses a standard parallel interface for direct connection to 8-bit microcontroller and DSP memory buses, and comes in a surface-mount 28-pin flat package. Typical applications include industrial controllers, embedded systems, and legacy telecom equipment that require non-volatile parameter storage with byte-level rewritability.
Pricing and availability for the X28HC256FI-90 are confirmed at quote time against an RFQ through independent distribution. Submit an RFQ to receive current pricing and stock status.
The X28C513EMB-25 is a 512 Kbit parallel EEPROM with 150 ns access time and a -55°C to 125°C range. It is a higher-density, wider-temperature alternative but runs slower and has a different pinout — verify footprint compatibility before substitution.
The X28HC256FI-90 is organized as 32K x 8 bits (256 Kbit total), with a parallel interface and a 90 ns access time.