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X25020 Datasheet(PDF) 5 Page - IC MICROSYSTEMS

Part No. X25020
Description  SPI Serial E2PROM with Block LockTM Protection
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Maker  ICMIC [IC MICROSYSTEMS]
Homepage  http://www.icmic.com
Logo ICMIC - IC MICROSYSTEMS

X25020 Datasheet(HTML) 5 Page - IC MICROSYSTEMS

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X25020
5
Figure 1. Read E2PROM Array Operation Sequence
Operational Notes
The X25020 powers-up in the following state:
• The device is in the low power standby state.
• A HIGH to LOW transition on
CS is required to
enter an active state and receive an instruction.
• SO pin is high impedance.
• The “write enable” latch is reset.
Figure 2. Read Status Register Operation Sequence
Data Protection
The following circuitry has been included to prevent
inadvertent writes:
• The “write enable” latch is reset upon power-up.
• A WREN instruction must be issued to set the “write
enable” latch.
CS must come HIGH at the proper clock count in
order to start a write cycle.
0123456789
10 11
12 13 14 15 16 17 18 19 20 21 22
3834 FHD F04.1
76543210
DATA OUT
CS
SCK
SI
SO
MSB
HIGH IMPEDANCE
INSTRUCTION
BYTE ADDRESS
76543210
0123456789
10
11
12 13 14
76543210
DATA OUT
CS
SCK
SI
SO
MSB
HIGH IMPEDANCE
INSTRUCTION
3834 ILL F13


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