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PDF ( 数据手册 , 数据表 ) ACE24C256B

零件编号 ACE24C256B
描述 Two-wire Serial EEPROM
制造商 ACE Technology
LOGO ACE Technology LOGO 


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ACE24C256B 数据手册, 描述, 功能
ACE24C128B/256B/512B
Two-wire Serial EEPROM
Description
The ACE24C128B/256B/512B provides 131,072/262,144/524,288 bits of serial electrically erasable and
programmable read-only memory (EEPROM), organized as 16,384/32,768/65,536 words of 8 bits each. The device is
optimized for use in many industrial and commercial applications where low-power and low-voltage operation are
essential. The ACE24C128B/256B/512B is available in space-saving 8-lead PDIP, 8-lead SOP, and 8-lead TSSOP
packages and is accessed via a two-wire serial interface. In addition, the ACE24C128B/256B/512B is available in
1.7V (1.7V to 5.5V) version.
Features
Wide Voltage Operation
- VCC = 1.7V to 5.5V
Operating Ambient Temperature: -40to +85
Internally Organized:
- ACE24C128B, 16,384 * 8 (128K bits)
- ACE24C256B, 32,768 * 8 (256K bits)
- ACE24C512B, 65,536 * 8 (512K bits)
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
1 MHz (5V), 400 KHz (1.7V, 2.5V, 2.7V) Compatibility
Write Protect Pin for Hardware Data Protection
64-byte Page (128K, 256K), 128-byte (512K) Write Modes
Partial Page Writes Allowed
Self-timed Write Cycle (5 ms max)
High-reliability
- Endurance: 1 Million Write Cycles
- Data Retention: 100 Years
Absolute Maximum Ratings
DC Supply Voltage
-0.3 to 6.5V
Input / Output Voltage
GND-0.3V to VCC+0.3V
Operating Ambient Temperature
-40to 85
Storage Temperature
-65to 150
*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 1.4 1







ACE24C256B pdf, 数据表
ACE24C128B/256B/512B
Two-wire Serial EEPROM
Current Address Read:
The internal data word address counter maintains the last address accessed during the last read or
write operation, incremented by one. This address stays valid between operations as long as the chip
power is maintained. The address "roll over" during read is from the last byte of the last memory page to
the first byte of the first page. The address "roll over" during write is from the last byte of the current page
to the first byte of the same page.
Once the device address with the read/write select bit set to "1" is clocked in and acknowledged by the
EEPROM, the current address data word is serially clocked out. The microcontroller does not respond
with an input "0" but does generate a following stop condition (see Figure 7 on page 8).
Read Operations
Random Read:
A random read requires a "dummy" byte write sequence to load in the data word address. Once the
device address word and data word address are clocked in and acknowledged by the EEPROM, the
microcontroller must generate another start condition. The microcontroller now initiates a current
address read by sending a device address with the read/write select bit high. The EEPROM
acknowledges the device address and serially clocks out the data word. The microcontroller does not
respond with a "0" but does generate a following stop condition (see Figure 8 on page 8).
Sequential Read:
Sequential reads are initiated by either a current address read or a random address read. After the
microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM
receives an acknowledge, it will continue to increment the data word address and serially clock out
sequential data words. When the memory address limit is reached, the data word address will "roll over"
and the sequential read will continue. The sequential read operation is terminated when the
microcontroller does not respond with a "0" but does generate a following stop condition (see Figure 9 on
page 8).
Figure 4: Device Address
VER 1.4 8







ACE24C256B equivalent, schematic
Packaging information
TSSOP-8
ACE24C128B/256B/512B
Two-wire Serial EEPROM
VER 1.4 16










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