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X25097PI-1.8 Datasheet(PDF) 2 Page - Xicor Inc.

Part # X25097PI-1.8
Description  5MHz Low Power SPI Serial E 2 PROM with IDLock TM Memory
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Manufacturer  XICOR [Xicor Inc.]
Direct Link  http://www.xicor.com
Logo XICOR - Xicor Inc.

X25097PI-1.8 Datasheet(HTML) 2 Page - Xicor Inc.

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X25097
2
PIN DESCRIPTIONS
Serial Output (SO)
SO is a push/pull serial data output pin. During a read
cycle, data is shifted out on this pin. Data is clocked out
by the falling edge of the serial clock.
Serial Input (SI)
SI is a serial data input pin. All opcodes, byte addresses,
and data to be written to the memory are input on this
pin. Data is latched by the rising edge of the serial clock.
Serial Clock (SCK)
The Serial Clock controls the serial bus timing for data
input and output. Opcodes, addresses, or data present
on the SI pin are latched on the rising edge of the clock
input, while data on the SO pin change after the falling
edge of the clock input.
Chip Select (CS)
When CS is HIGH, the X25097 is deselected and the SO
output pin is at high impedance and unless an internal
write operation is underway, the X25097 will be in the
standby power mode. CS LOW enables the X25097,
placing it in the active power mode. It should be noted
that after power-up, a HIGH to LOW transition on CS is
required prior to the start of any operation.
Write Protect (WP)
When WP is LOW, nonvolatile writes to the X25097 are
disabled, but the part otherwise functions normally. When
WP is held HIGH, all functions, including nonvolatile
writes operate normally. WP going LOW while CS is still
LOW will interrupt a write to the X25097. If the internal
write cycle has already been initiated, WP going low will
have no affect on this write.
PIN NAMES
7038 FRM T01
PIN CONFIGURATION
PRINCIPLES OF OPERATION
The X25097 is a 1024 x 8 E2PROM designed to interface
directly with the synchronous Serial Peripheral Interface
(SPI) of many popular microcontroller families.
The X25097 contains an 8-bit instruction register. It is
accessed via the SI input, with data being clocked in on
the rising edge of SCK. CS must be LOW and the WP
input must be HIGH during the entire operation. Table 1
contains a list of the instructions and their opcodes. All
instructions, addresses and data are transferred MSB first.
Data input is sampled on the first rising edge of SCK
after CS goes LOW. SCK is static, allowing the user to
stop the clock and then start it again to resume opera-
tions where left off.
Write Enable Latch
The X25097 contains a “Write Enable” latch. This latch
must be SET before a write operation is initiated. The
WREN instruction will set the latch and the WRDI instruc-
tion will reset the latch (Figure 4). This latch is automati-
cally reset upon a power-up condition and after the
completion of a byte or page write cycle.
Symbol
Description
CS
Chip Select Input
SO
Serial Output
SI
Serial Input
SCK
Serial Clock Input
WP
Write Protect Input
VSS
Ground
VCC
Supply Voltage
NC
No Connect
SCK
SI
VSS
WP
7038 FRM F02.2
NC
VCC
CS
SO
1
2
3
4
8
7
6
5
8 Lead TSSOP
VCC
NC
SCK
SI
7038 FRM F02
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
8 Lead SOIC/PDIP
X25097
X25097
*0.197"
*0.244"
0.122"
0.252"
Not to scale
*SOIC Mesaurement


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