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Chip Select is a TTL compatible input which, when set HIGH, allows normal operation of the device. Any time Chip Select is set LOW, it resets the device, terminating all l/0 communication, and puts the output in a high impedance state. CS is used to reset the device if an error condition exists or to put the device in a power- down mode to minimize power consumption. It may also be used to frame data transmission in applications where the clock and data input have to be ignored from time to time. Although CS resets the device, it does not change the program/erase or the access-enable status, nor does it terminate a programming cycle once it has started. The program/erase and access-enable opera- tions, once enabled, will remain enabled until specific disabling instructions are sentor until poweris removed.