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EN29LV400AT-55RTIP Datasheet(PDF) 10 Page - Eon Silicon Solution Inc. |
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EN29LV400AT-55RTIP Datasheet(HTML) 10 Page - Eon Silicon Solution Inc. |
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10 / 41 page  This Data Sheet may be revised by subsequent versions ©2005 Eon Silicon Solution, Inc., www.essi.com.tw or modifications due to changes in technical specifications. 10 EN29LV400A Automatic Sleep Mode The automatic sleep mode minimizes Flash device energy consumption. The device automatically enables this mode when addresses remain stable for tacc + 30ns. The automatic sleep mode is independent of the CE#, WE# and OE# control signals. Standard address access timings provide new data when addresses are changed. While in sleep mode, output is latched and always available to the system. ICC4 in the DC Characteristics table represents the automatic sleep more current specification. Hardware Data Protection The command sequence requirement of unlock cycles for programming or erasing provides data protection against inadvertent writes as seen in the Command Definitions table. Additionally, the following hardware data protection measures prevent accidental erasure or programming, which might otherwise be caused by false system level signals during Vcc power up and power down transitions, or from system noise. Low VCC Write Inhibit When Vcc is less than VLKO, the device does not accept any write cycles. This protects data during Vcc power up and power down. The command register and all internal program/erase circuits are disabled, and the device resets. Subsequent writes are ignored until Vcc is greater than VLKO. The system must provide the proper signals to the control pins to prevent unintentional writes when Vcc is greater than VLKO. Write Pulse “Glitch” protection Noise pulses of less than 5 ns (typical) on OE#, CE# or WE# do not initiate a write cycle. Logical Inhibit Write cycles are inhibited by holding any one of OE# = VIL, CE# = VIH, or WE# = VIH. To initiate a write cycle, CE# and WE# must be a logical zero while OE# is a logical one. If CE#, WE#, and OE# are all logical zero (not recommended usage), it will be considered a read. Power-up Write Inhibit During power-up, the device automatically resets to READ mode and locks out write cycles. Even with CE# = VIL, WE# = VIL and OE# = VIH, the device will not accept commands on the rising edge of WE#. Rev. A, Issue Date: 2005/01/07 |
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