64K-bit UV EPROM memory IC, organized as 8K x 8, featuring a 55ns maximum access time. This through-hole component utilizes a parallel interface and is housed in a 24-pin windowed ceramic dual in-line package (CDIP). Operating with a typical supply voltage of 5V (4.5V to 5.5V range), it supports in-system and external reprogramming via UV light. The ceramic package measures 32.5mm (Max) in length, 7.87mm (Max) in width, and 3.56mm (Max) in height.
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Microchip AT27HC642-55DC technical specifications.
| Basic Package Type | Through Hole |
| Package Family Name | DIP |
| Package/Case | Windowed CDIP |
| Package Description | Windowed Ceramic Dual In Line Package |
| Lead Shape | Through Hole |
| Pin Count | 24 |
| PCB | 24 |
| Package Length (mm) | 32.5(Max) |
| Package Width (mm) | 7.87(Max) |
| Package Height (mm) | 3.56(Max) |
| Seated Plane Height (mm) | 5.08(Max) |
| Pin Pitch (mm) | 2.79(Max) |
| Package Material | Ceramic |
| Mounting | Through Hole |
| Density | 64Kbit |
| Maximum Access Time | 55ns |
| Interface Type | Parallel |
| Maximum Operating Current | 75mA |
| Organization | 8Kx8 |
| Reprogramming Technique | UV |
| Typical Operating Supply Voltage | 5V |
| In-System Programmability | In System|External |
| Density in Bits | 65536bit |
| Max Operating Supply Voltage | 5.5V |
| Min Operating Supply Voltage | 4.5V |
| Min Operating Temperature | 0°C |
| Max Operating Temperature | 70°C |
| Cage Code | 60991 |
| EU RoHS | No |
| HTS Code | 8542320061 |
| Schedule B | 8542320060 |
| ECCN | EAR99 |
| Automotive | No |
| AEC Qualified | No |
| PPAP | No |
| Radiation Hardening | No |
| RoHS Versions | 2011/65/EU, 2015/863 |
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