ACE24C256 Datasheet PDF - ACE Technology

ACE Technology

Part Number ACE24C256
Description Two-wire Serial EEPROM
Page 16 Pages

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Two-wire Serial EEPROM
The ACE24C128/256 provides 131,072/262,144 bits of serial electrically erasable and programmable read-only
memory (EEPROM) organized as 16,384/32,768 words of 8 bits each. The device’s cascadable feature allows up
to 8 devices to share a common two-wire bus. The device is optimized for use in many industrial and
commercial applications where low-power and low-voltage operations are essential.
z Low Operation Voltage: Vcc = 1.7V to 5.5V
z Internally Organized: 16,384 x 8(128K), 32,768 x 8(256K)
z Two-wire Serial Interface
z Schmitt Trigger, Filtered Inputs for Noise Suppression
z Bi-directional Data Transfer Protocol
z 1MHz (2.5V~5.5V) and 400 kHz (1.7V) Compatibility
z Write Protect Pin for Hardware Data Protection
z 64-byte Page Write Modes (Partial Page Writes are Allowed)
z Self-timed Write Cycle (5 ms max)
z High-reliability - Endurance: 1,000,000 Write Cycles
- Data Retention: 100 Years
z PDIP-8,SOP-8,TSSOP-8 ROHS compliant Packages
z Wafer Sales: available in inked wafer Form
Absolute Maximum Ratings
Operating Temperature
Storage Temperature
-55to +125
-65to +150
Voltage on Any Pin with Respect to Ground -1.0V to +7.0V
Maximum Operating Voltage
DC Output Current
5.0 mA
*Notice: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
VER 1.2 1 

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Two-wire Serial EEPROM
Packaging Type
Pin Configurations
Pin Name
A0~A2 Device Address Inputs
SDA Serial Data Input / Output
SCL Serial Clock Input
WP Write Protect
VCC Power Supply
GND Ground
VER 1.2 2

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Two-wire Serial EEPROM
Block Diagram
Figure 1
VER 1.2 3

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Two-wire Serial EEPROM
Ordering information
Selection Guide
ACE24C128/256 XX + X H
U : Tube
T : Tape and Reel
Pb - free
FM : SOP-8
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/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. 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.
Write Protect Description
WP Pin Status
Part of the Array Protected
Full (128K) Memory
Full (256K) Memory
Normal Read/Write Operations
VER 1.2 4

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