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CAT25C02YI-1.8TE13 Datasheet(PDF) 5 Page - Catalyst Semiconductor

No. de pieza CAT25C02YI-1.8TE13
Descripción Electrónicos  1K/2K/4K SPI Serial CMOS EEPROM
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25C02YI-1.8TE13 Datasheet(HTML) 5 Page - Catalyst Semiconductor

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Discontinued
Parts
5
CAT25C01, CAT25C02, CAT25C04
Doc. No. 1105, Rev. B
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Status Register Bits
Array Address
Protection
BP1
BP0
Protected
0
0
None
No Protection
0
1
CAT25C01: 60-7F
Quarter Array Protection
CAT25C02: C0-FF
CAT25C04: 180-1FF
1
0
CAT25C01: 40-7F
Half Array Protection
CAT25C02: 80-FF
CAT25C04: 100-1FF
1
1
CAT25C01: 00-7F
Full Array Protection
CAT25C02: 00-FF
CAT25C04: 000-1FF
BLOCK PROTECTION BITS
76543210
WPEN
1
1
1
BP1
BP0
WEL
RDY
STATUS REGISTER
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to synchronize
the communication between the microcontroller and the
CAT25C01/02/04. Opcodes, byte addresses, or data
present on the SI pin are latched on the rising edge of the
SCK. Data on the SO pin is updated on the falling edge
of the SCK for SPI modes (0,0 & 1,1) .
CS
CS
CS
CS
CS: Chip Select
CS is the Chip select pin. CS low enables the CAT25C01/
02/04 and
CS high disables the CAT25C01/02/04. CS
high takes the SO output pin to high impedance and
forces the devices into a Standby Mode (unless an
internal write operation is underway) The CAT25C01/
02/04 draws ZERO current in the Standby mode. A high
to low transition on
CS is required prior to any sequence
being initiated. A low to high transition on
CS after a valid
write sequence is what initiates an internal write cycle.
WP
WP
WP
WP
WP: Write Protect
WP is the Write Protect pin. The Write Protect pin will
allow normal read/write operations when held high.
When
WP is tied low and the WPEN bit in the status
register is set to “1”, all write operations to the status
register are inhibited.
WP going low while CS is still low
will interrupt a write to the status register. If the internal
write cycle has already been initiated,
WP going low will
have no effect on any write operation to the status
register. The
WP pin function is blocked when the WPEN
bit is set to 0.
Figure 10 illustrates the
WP timing
sequence during a write operation.
HOLD
HOLD
HOLD
HOLD
HOLD: Hold
The
HOLD pin is used to pause transmission to the
CAT25C01/20/40 while in the middle of a serial sequence
without having to re-transmit entire sequence at a later
time. To pause,
HOLD must be brought low while SCK
is low. The SO pin is in a high impedance state during
the time the part is paused, and transitions on the SI pins
will be ignored. To resume communication,
HOLD is
brought high, while SCK is low. (
HOLD should be held
high any time this function is not being used.)
HOLD may
be tied high directly to VCC or tied to VCC through a
resistor. Figure 9 illustrates hold timing sequence.
Protected
Unprotected
Status
WPEN
WP
WP
WP
WP
WP
WEL
Blocks
Blocks
Register
0
X
0
Protected
Protected
Protected
0
X
1
Protected
Writable
Writable
1
Low
0
Protected
Protected
Protected
1
Low
1
Protected
Writable
Protected
X
High
0
Protected
Protected
Protected
X
High
1
Protected
Writable
Writable
WRITE PROTECT ENABLE OPERATION


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