X25C02 Datasheet, PDF (2/14 Pages) Xicor Inc. – SPI Serial E2PROM

X25C02
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 the serial data input pin. All data, 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 sampled or 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 X25C02 is deselected and the
SO output pin is at HIGH impedance and unless an
internal write operation is underway, the X25C02 will be
PIN CONFIGURATION
CS
SO
WP
VSS
MSOP/DIP/SOIC
1
8
2
7
X25C02
3
6
4
5
VCC
HOLD
SCK
SI
3843 FHD F02.2
in the standby power mode. CS LOW enables the
X25C02, 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 X25C02 are
disabled, but the part otherwise functions normally.
When WP is held HIGH, all functions, including nonvola-
tile writes operate normally. WP going LOW while CS is
still LOW will interrupt a write to the X25C02. If the
internal write cycle has already been initiated, WP going
LOW will have no affect on a write.
Hold (HOLD)
HOLD is used in conjunction with the CS pin to select the
device. Once the part is selected and a serial sequence is
underway, HOLD may be used to pause the serial
communication with the controller without resetting
the serial sequence. To pause, HOLD must be brought
LOW while SCK is LOW. To resume communication,
HOLD is brought HIGH, again while SCK is LOW. If the
pause feature is not used, HOLD should be held HIGH
at all times.
PIN NAMES
Symbol
CS
SO
SI
SCK
WP
VSS
V_CC
HOLD
Description
Chip Select Input
Serial Output
Serial Input
Serial Clock Input
Write Protect Input
Ground
Supply Voltage
Hold Input
3843 PGM T01
2