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X25043PI-2.7 Datasheet(PDF) 5 Page - Xicor Inc.

Part # X25043PI-2.7
Description  Programmable Watchdog Supervisory E2PROM
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X25043PI-2.7 Datasheet(HTML) 5 Page - Xicor Inc.

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X25043/45
5
Figure 1. Read E2PROM Array Operation Sequence
The RESET (X25045) output is designed to go HIGH
whenever VCC has dropped below the minimum trip
point and/or the watchdog timer has reached its pro-
grammable time-out limit.
Operational Notes
The X25043/45 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.
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.
The “write enable” latch is reset when
WP is brought
LOW.
Figure 2. Read Status Register Operation Sequence
0123456789
10
11
12 13 14
76543210
DATA OUT
CS
SCK
SI
SO
MSB
HIGH IMPEDANCE
INSTRUCTION
3844 ILL F15
0123456789
10 11
12 13 14 15 16 17 18 19 20 21 22
3844 FHD F04
76543210
DATA OUT
CS
SCK
SI
SO
MSB
HIGH IMPEDANCE
INSTRUCTION
BYTE ADDRESS
7
6543210
8
9TH BIT OF ADDRESS


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