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MX23L3254 Datasheet(PDF) 5 Page - Macronix International |
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MX23L3254 Datasheet(HTML) 5 Page - Macronix International |
5 / 18 page 5 P/N: PM1167 REV. 1.2, JUN. 08, 2005 MX23L3254 OPERATING FEATURES Active Power, Stand-by Power When Chip Select (S#) is Low, the device is enabled, and in the Active Power mode. When Chip Select (S#) is High, the device is disabled, but could remain in the Active Power mode until all internal cycles have completed. The device then goes in to the Stand-by Power mode. The device consumption drops to ICC1 . Protection Modes The environments where non-volatile memory devices are used can be very noisy. No SPI device can operate correctly in the presence of excessive noise. To help combat this, the MX23L3254 boasts the following data protection mechanisms: - Power-On Reset and an internal timer (tPUW) can provide protection against inadvertant changes while the power supply is outside the operating specification. Hold Condition The Hold (HOLD#) signal is used to pause any serial communications with the device without resetting the clocking sequence. To enter the Hold condition, the device must be selected, with Chip Select (S#) Low. The Hold condition starts on the falling edge of the Hold (HOLD) signal, provided that this coincides with Serial Clock (C) being Low (as shown in Figure 3). The Hold condition ends on the rising edge of the Hold (HOLD#) signal, provided that this coincides with Serial Clock (C) being Low. If the falling edge does not coincide with Serial Clock (C) being Low, the Hold condition starts after Serial Clock (C) next goes Low. Similarly, if the rising edge does not coincide with Serial Clock (C) being Low, the Hold condi- tion ends after Serial Clock (C) next goes Low. (This is shown in Figure 2). During the Hold condition, the Serial Data Output (Q) is high impedance, and Serial Data Input (D) and Serial Clock (C) are Don't Care. Normally, the device is kept selected, with Chip Select (S#) driven Low, for the whole duration of the Hold condi- tion. This is to ensure that the state of the internal logic remains unchanged from the moment of entering the Hold condition. If Chip Select (S#) goes High while the device is in the Hold condition, this has the effect of resetting the internal logic of the device. To restart communication with the device, it is necessary to drive Hold (HOLD#) High, and then to drive Chip Select (S#) Low. This prevents the device from going back to the Hold condition. Figure 3. Hold Condition Activation (for data output only) Q4 Q2 Q1 Q0 Q C HOLD# HOLD# C Q0 Q1 Q3 Q4 Q5 Q2 Q2 Q3 Q2 Q5 Q6 Q |
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