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CAT25640 датащи(PDF) 10 Page - Catalyst Semiconductor

номер детали CAT25640
подробное описание детали  64-Kb SPI Serial CMOS EEPROM
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25640 датащи(HTML) 10 Page - Catalyst Semiconductor

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CAT25640
Doc. No. MD-1128 Rev. B
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Hold Operation
The HOLD
¯¯¯¯¯ input can be used to pause communication
between host and CAT25640. To pause, HOLD
¯¯¯¯¯ must
be taken low while SCK is low (Figure 10). During the
hold condition the device must remain selected (CS
¯¯
low). During the pause, the data output pin (SO) is tri-
stated (high impedance) and SI transitions are
ignored. To resume communication, HOLD
¯¯¯¯¯ must be
taken high while SCK is low.
DESIGN CONSIDERATIONS
The CAT25640 device incorporates Power-On Reset
(POR) circuitry which protects the internal logic
against powering up in the wrong state. The device
will power up into Standby mode after VCC exceeds
the POR trigger level and will power down into Reset
mode when VCC drops below the POR trigger level.
This bi-directional POR behavior protects the device
against ‘brown-out’ failure following a temporary loss
of power.
The CAT25640 device powers up in a write disable
state and in a low power standby mode. A WREN
instruction must be issued prior any writes to the
device.
After power up, the CS
¯¯ pin must be brought low to
enter a ready state and receive an instruction. After a
successful byte/page write or status register write, the
device goes into a write disable mode. The CS
¯¯ input
must be set high after the proper number of clock
cycles to start the internal write cycle. Access to the
memory array during an internal write cycle is ignored
and programming is continued. Any invalid op-code
will be ignored and the serial output pin (SO) will
remain in the high impedance state.
Figure 10. HOLD
¯¯¯¯¯ Timing
Note:
Dashed Line = mode (1, 1) - - - - - -
CS
SCK
HOLD
SO
tCD
tHD
tHD
tCD
tLZ
tHZ
HIGH IMPEDANCE


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