ACE24C128_11 Datasheet, PDF (4/18 Pages) ACE Technology Co., LTD. – Two-wire Serial EEPROM

Ordering information
ACE24C128/256 XX + X H
Halogen-free
U : Tube
T : Tape and Reel
Pb - free
DP : DIP-8
FM : SOP-8
TM : TSSOP-8
DM : TDFN-8
OM : MSOP-8
ACE24C128/256
Two-wire Serial EEPROM
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 bi-directional 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 or left not connected for
hardware compatibility with other ACE24CXXX devices. When the pins are hardwired, as many as
eight 128K/256K devices may be addressed on a single bus system (device addressing is discussed in
detail under the Device Addressing section).If the pins are left floating, the A2, A1 and A0 pins will be
internally pulled down to GND if the capacitive coupling to the circuit board Vcc plane is < 3pF, if
coupling is > 3pF recommends connecting the address pins to GND.
Write Protect (WP):
The ACE24C128/256 has a Write Provides hardware data protection. The WP pin allows normal write
operations when connected to ground (GND). When the Write Protect pin is connected to Vcc. All write
operations to the memory are inhibited.
The ACE24C128 if the pin is left floating, the WP pin will be internally pulled is < 3pF , if coupling is
> 3pF, recommends connecting the pins to GND. Switching WP to Vcc prior to a write operation
creates a software write protected function.
VER 1.5 4