Product Overview
256-Kbit CMOS UV-Erasable Programmable Read-Only Memory DIP-28
Condition
Used surplus. Evaluation: Programmed but never installed in equipment. Pins are clean and unbent with clear quartz erasure window. Markings legible: TMS JL 27C256-150. Sold individually.
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Product Overview
Texas Instruments TMS27C256-150JL is a 262,144-bit ultraviolet-erasable programmable read-only memory organized as 32,768 words of 8 bits. Built on CMOS technology, it delivers a maximum access time of 150 ns while operating from a standard 5V power supply. The 28-pin ceramic dual-in-line package features a transparent quartz lid allowing ultraviolet light exposure to erase stored bit patterns for reprogramming.
Key Features
- Storage capacity of 262,144 bits configured as 32K x 8 bits
- 150 ns maximum access time
- 5.0V standard read operation supply voltage
- Side-brazed ceramic dual-in-line package with transparent quartz erasure window
- Standard 0.600-inch row spacing with 0.100-inch lead pitch
- Commercial 0°C to 70°C operating temperature range
Applications
- Restoring firmware on vintage 8-bit and 16-bit arcade and pinball boards
- Replacing corrupted BIOS or boot ROMs in legacy industrial computer systems
- Burning test firmware during bench repair of retro computers and synthesizers
- Prototyping embedded microprocessor designs on solderless breadboards or standard DIP sockets
Frequently Asked Questions
Does this chip come pre-erased or will I need to erase it before programming?
This chip was programmed prior to storage and has not been blank-checked. You will need to expose the quartz window to an ultraviolet eraser before programming your own code.
What supply voltage is required for standard read operation?
Nominal read operation requires a standard 5.0V power supply rail.
What socket does this ceramic package fit?
This IC fits standard 28-pin dual inline sockets with 0.600-inch row-to-row spacing and 0.100-inch lead pitch. More pieces cost less each - the price-break table on this page shows what each quantity costs.
Nothing matches the tactile satisfaction of sliding a ceramic windowed DIP into an eraser and watching legacy code make way for a fresh build.
