MX23L1654 Ver la hoja de datos (PDF) - Macronix International
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MX23L1654 Datasheet PDF : 18 Pages
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MX23L1654
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 MX23L1654 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)
C
HOLD#
Q
Q0
Q2
Q1
Q2
Q3
Q4
Q5
C
HOLD#
Q
Q0
Q2
Q1
Q2
Q3
Q4
Q5
Q6
P/N: PM1174
REV. 1.2, JUN. 08, 2005
5
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