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MB85RS128A
■ PIN ASSIGNMENT
(TOP VIEW)
CS
SO
WP
GND
1
2
3
4
8
7
6
5
V CC
HOLD
SCK
SI
(FPT-8P-M02)
■ PIN FUNCTIONAL DESCRIPTIONS
Pin No. Pin Name
Functional description
Chip Select
This is an input pin to make chips select. When CS is “H”, device is in deselect (standby)
2
1
3
7
6
5
2
8
4
CS
WP
HOLD
SCK
SI
SO
V CC
GND
status as long as device is not write status internally, and SO becomes High-Z. Other in-
puts from pins are ignored for this time. When CS is “L”, device is in select (active) status.
CS has to be “L” before inputting op-code.
Write Protect
This is a pin to control writing to a status register. When WP is “L”, writing to a status
register is not operated.
Hold
This pin is used to interrupt serial input/output without making chips deselect. When
HOLD is “L”, hold operation is activated, SO becomes High-Z, SCK and SI become don’t
care. While the hold operation, CS has to be retained “L”.
Serial Clock
This is a clock input pin to input/output serial data. SI is loaded synchronously to a rising
edge, SO is output synchronously to a falling edge.
Serial Data Input
This is an input pin of serial data. This inputs op-code, address, and writing data.
Serial Data Output
This is an output pin of serial data. Reading data of FRAM memory cell array and status
register data are output. This is High-Z during standby.
Supply Voltage
Ground
DS501-00008-0v01-E
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