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ACE24C256B Schematic ( PDF Datasheet ) - ACE Technology

Teilenummer ACE24C256B
Beschreibung Two-wire Serial EEPROM
Hersteller ACE Technology
Logo ACE Technology Logo 




Gesamt 17 Seiten
ACE24C256B Datasheet, Funktion
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 Datasheet, Funktion
ACE24C128B/256B/512B
Two-wire Serial EEPROM
Figure 2: Start and Stop Definition
Figure 3: Output Acknowledge
Device Addressing
The 128K/256K/512K EEPROM devices all require an 8-bit device address word following a start
condition to enable the chip for a read or write operation (see to Figure 4 on page 7).
The device address word consists of a mandatory "1", "0" sequence for the first four most significant
bits as shown. This is common to all the Serial EEPROM devices.
The 128K/256K/512K EEPROM uses A2, A1 and A0 device address bits to allow as much as eight
devices on the same bus. These 3 bits must be compared to their corresonding hardwired input pins.
The A2, A1 and A0 pins use an internal proprietary circuit that biases them to a logic low condition if the
pins are allowed to float.
VER 1.4 6

6 Page









ACE24C256B pdf, datenblatt
ACE24C128B/256B/512B
Two-wire Serial EEPROM
AC Characteristics
Applicable over recommended operating range from: TA=-40to +85, VCC=+1.7V to +5.5V, CL =1TTL Gate and 100pF
(unless otherwise noted).
Symbol
Parameter
1.7VVCC2.5V 2.5VVCC5.5V
Units
Min Typ Max Min Typ Max
fSCL
TLOW
THIGH
TI
TAA
TBUF
Clock Frequency, SCL
Clock Pulse Width Low
Clock Pulse Width High
Noise Suppression Time
Clock Low to Data Out Valid
Time the bus must be free before a
new transmission can Start
1.2
0.6
0.1
1.2
400
0.6
0.4
50
0.9 0.05
0.5
1000
50
0.9
kHz
µs
µs
ns
µs
µs
THD.STA
TSU.STA
THD.DAT
TSU.DAT
TR
TF
TSU.STO
TDH
TWR
Endurance
Start Hold Time
Start Setup Time
Data In Hold Time
Data In Setup Time
Inputs Rise Time 1
Inputs Fall Time 1
Stop Setup Time
Data Out Hold Time
Write Cycle Time
5.0V, 25, Page Mode
0.6 0.25 µs
0.6 0.25 µs
0 0 µs
100 100 ns
0.3 0.3 µs
300 300 ns
0.6 0.25 µs
50 50 ns
3.3 5
3.3 5 ms
Write
1M
Cycles
Notes:1. This parameter is characterized and not 100% tested.
2.AC measurement conditions:
RL (connects to Vcc): 1.3kΩ(2.5V,5V),10kΩ(1.7V)
Input pulse voltages: 0.3 Vcc to 0.7 Vcc
Input rise and fall times: 50 ns
Input and output timing reference voltages: 0.5Vcc
The value of RL should be concerned according to the actual loading on the user’s system.
VER 1.4 12

12 Page





SeitenGesamt 17 Seiten
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