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CAT25080LIT3 Datasheet(PDF) 10 Page - Catalyst Semiconductor

Part # CAT25080LIT3
Description  8-Kb and 16-Kb SPI Serial CMOS EEPROM
Download  17 Pages
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25080LIT3 Datasheet(HTML) 10 Page - Catalyst Semiconductor

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CAT25080, CAT25160
Doc. No. 1122 Rev. A
10
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Hold Operation
The HOLD
¯¯¯¯¯ input can be used to pause communication
between host and CAT25080/160. 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 CAT25080/160 devices incorporate 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 CAT25080/160 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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