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AT24C128B
4. Pin Description
SERIAL CLOCK (SCL): The SCL input is used to positive-edge clock data into each EEPROM
device and negative-edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open-
drain driven and may be wire-ORed with any number of other open-drain or open-collector
devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1, and A0 pins are device address inputs
that are hardwired (directly to GND or to Vcc) for compatibility with other AT24Cxx devices.
When the pins are hardwired, as many as eight 128K devices may be addressed on a single bus
system. (Device addressing is discussed in detail under “Device Addressing,” page 8 .) A device
is selected when a corresponding hardware and software match is true. If these pins are left
floating, the A2, A1, and A0 pins will be internally pulled down to GND. However, due to capaci-
tive coupling that may appear during customer applications, Atmel recommends always
connecting the address pins to a known state. When using a pull-up resistor, Atmel recommends
using 10k ? or less.
WRITE PROTECT (WP): The write protect input, when connected to GND, allows normal write
operations. When WP is connected directly to Vcc, all write operations to the memory are inhib-
ited. If the pin is left floating, the WP pin will be internally pulled down to GND. However, due to
capacitive coupling that may appear during customer applications, Atmel recommends always
connecting the WP pins to a known state. When using a pull-up resistor, Atmel recommends
using 10k ? or less.
3
5296A–SEEPR–1/08
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相关PDF资料
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相关代理商/技术参数
AT24C128C1-10CC 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Wire Serial EEPROMs
AT24C128C1-10CC-1.8 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Wire Serial EEPROMs
AT24C128C1-10CC-2.7 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Wire Serial EEPROMs
AT24C128C1-10CI 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Wire Serial EEPROMs
AT24C128C1-10CI-1.8 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Wire Serial EEPROMs
AT24C128C1-10CI-2.7 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2-Wire Serial EEPROMs
AT24C128C-CUM-T 制造商:Atmel Corporation 功能描述:
AT24C128C-MAHM-T 功能描述:电可擦除可编程只读存储器 SERIAL 电可擦除可编程只读存储器 128K (16K x 8) 2WIRE 1.7V RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8