CY7C271-55WMB

CY7C271-55WMB is a Cypress 256 Kbit power-switched ultraviolet-erasable PROM organized as 32,768 × 8. The exact ordering row specifies a 55 ns access time, W22 28-lead 300-mil windowed CerDIP, and the military operating range. The Cypress data sheet specifies 5 V ±10% operation from -55°C to +125°C, with 130 mA maximum operating supply current and 40 mA maximum standby current for military-range devices.

This device is erased through its quartz window with ultraviolet exposure and then programmed with the specified EPROM programming algorithm; it is not electrically reprogrammable in-system. ZZX Electronics lists 963 pcs with date code 2227. Before use, verify programmed versus erased state, window and label condition, top marking, programming compatibility, lot/date-code evidence, storage history and any contract-specific screening paperwork. The data sheet does not identify this part as radiation tolerant, so radiation performance must not be inferred from the ceramic package or military temperature range. Send an RFQ for current lot photos, traceability and inspection options.