HN58X24128FPI 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HN58X24128FPI

Two-wire serial interface 128k EEPROM (16-kword × 8-bit) 256k EEPROM (32-kword × 8-bit)

Hitachi -> Renesas Electronics 

HN58X24128I/HN58X24256I

Device Addressing

The EEPROM device requires an 8-bit device address word following a start condition to enable the chip

for a read or a write operation. The device address word consists of 4-bit device code, 3-bit device address

code and 1-bit read/write(R/W) code. The most significant 4-bit of the device address word are used to

distinguish device type and this EEPROM uses “1010” fixed code. The device address word is followed by

the 3-bit device address code in the order of A2, A1, A0. The device address code selects one device out of

all devices which are connected to the bus. This means that the device is selected if the inputted 3-bit

device address code is equal to the corresponding hard-wired A2-A0 pin status. The eighth bit of the

device address word is the read/write(R/W) bit. A write operation is initiated if this bit is low and a read

operation is initiated if this bit is high. Upon a compare of the device address word, the EEPROM enters

the read or write operation after outputting the zero as an acknowledge. The EEPROM turns to a stand-by

state if the device code is not “1010” or device address code doesn’t coincide with status of the correspond

hard-wired device address pins A0 to A2.

Device Address Word

Device address word (8-bit)

Device code (fixed)

128k, 256k 1

0

1

0

Note: 1. R/W=“1” is read and R/W = “0” is write.

Device address code

A2

A1

A0

R/W code*1

R/W

11

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