AT24C128C-XHM-B Atmel, AT24C128C-XHM-B Datasheet - Page 3

• Manufacturer Part Number: AT24C128C-XHM-B
• Description: EEPROM SERIAL EEPROM 128K (16K x 8) 2WIRE 1.7V
• Manufacturer: Atmel

Specifications of AT24C128C-XHM-B

• Rohs: yes
• Factory Pack Quantity: 100

3.
4.
Block Diagram
Pin Descriptions
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 Addresses (A
or to V
devices may be addressed on a single bus system. (Device addressing is discussed in detail in
Addressing” on page
are left floating, the A
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 V
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.
Table 4-1.
WP Pin
At GND
Status
At V
CC
) for compatibility with other Atmel AT24C devices. When the pins are hard wired, as many as eight 128K
CC
Write Protect
GND
SDA
V
SCL
WP
9). A device is selected when a corresponding hardware and software match is true. If these pins
2
A
A
A
CC
, A
2
2
1
0
CC
, A
1
, all write operations to the memory are inhibited. If the pin is left floating, the WP pin will be
, and A
1
Normal Read/Write Operations
, A
Part of the Array Protected
0
): The A
Atmel AT24C128C
0
D
pins will be internally pulled down to GND. However, due to capacitive coupling that
IN
Full Array
2
, A
Comparator
Logic
Start
Stop
Address
1
Device
, and A
LOAD
D
OUT
R/W
0
pins are device address inputs that are hard wired (directly to GND
Addr/Counter
Data Word
COMP
LOAD
Y DEC
Control
Serial
Logic
INC
Atmel AT24C128C [DATASHEET]
EN
H.V. Pump/Timing
Data Recovery
Serial MUX
EEPROM
D
LOGIC
OUT
/ACK
Section 7. “Device
8734B–SEEPR–9/2012
3