24C02 24C04 24C08 24C16: Bookly Micro
24C02 24C04 24C08 24C16: Bookly Micro
24C02 24C04 24C08 24C16: Bookly Micro
Bookly Micro
JANUARY 20077
IS
DESCRIPTION
The 24C02, 24C04, 24C08, and 24C16 are electrically erasable PROM devices that use the standard 2-wire interface for communications. The 24C02, 24C04, 24C08, and 24C16 contain a memory array of 2K-bits (256 x 8), 4K-bits (512 x 8), 8K-bits (1,024 x 8), and 16K-bits (2,048 x 8), respectively. Each device is organized into 16 byte pages for page write mode. This EEPROM operates in a wide voltage range of 1.8V to 5.5V to be compatible with most application voltages. BM designed this device family to be a practical, low-power 2-wire EEPROM solution. The devices are available in 8-pin PDIP, 8-pin SOIC, 8pad DFN, 8-pin MSOP, and 8-pin TSSOP packages. Replace Atmel or Microchip 24xx directly. The 24C02/04/08/16 maintains compatibility with the popular 2-wire bus protocol, so it is easy to use in applications implementing this bus type. The simple bus consists of the Serial Clock wire (SCL) and the Serial Data wire (SDA). Using the bus, a Master device such as a microcontroller is usually connected to one or more Slave devices such as this device. The bit stream over the SDA line includes a series of bytes, which identifies a particular Slave device, an instruction, an address within that Slave device, and a series of data, if appropriate. The 24C02/04/08/16 has a Write Protect pin (WP) to allow blocking of any write instruction transmitted over the bus.
Copyright 2007 Bookly Micro Electronics, Inc. All rights reserved. BM reserves the right to make changes to this specification and its products at any time without notice. BM assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
BM
Vcc
SDA SCL WP
X DECODER
EEPROM ARRAY
A0 1 A1 2 A2 3
Y DECODER
GND
ACK
Clock DI/O
>
nMOS
DATA REGISTER
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PIN CONFIGURATION
8-pad DFN
PIN CONFIGURATION
8-Pin DIP, SOIC, DFN, TSSOP, MSOP
A0 A1 A2 GND
1 2 3 4
8 7 6 5
A0 1 A1 2 A2 3 GND 4
(Top View)
PIN DESCRIPTIONS
A0-A2 SDA SCL WP Vcc GND Address Inputs Serial Address/Data I/O Serial Clock Input Write Protect Input Power Supply Ground
The 24C04 uses A1 and A2 pins for hardwire addressing and a total of four devices may be addressed on a single bus system. The A0 pin is a no connect in the 24C04. When the A1 or A2 input is left floating, the input internally defaults to zero. The 24C08 only uses the A2 input for hardwire addressing and a total of two devices may be addressed on a single bus system. The A0 and A1 pins are no connects in the 24C08. When the A2 input is left floating, the input internally defaults to zero. These pins are not used by 24C16 . The A0, A1, and A2 pins are no connects in the 24C16. WP WP is the Write Protect pin. If the WP pin is tied to VCC on the 24C02, 24C04, 24C08 and 24C16, the entire array becomes Write Protected (Read only). When WP is tied to GND or left floating normal read/write operations are allowed to the device.
SCL This input clock pin is used to synchronize the data transfer to and from the device. SDA The SDA is a Bi-directional pin used to transfer addresses and data into and out of the device. The SDA pin is an open drain output and can be wire-Or'ed with other open drain or open collector outputs. The SDA bus requires a pullup resistor to Vcc. A0, A1, A2 The A0, A1 and A2 are the device address inputs. The 24C02A uses the A0, A1, and A2 for hardware addressing and a total of 8 devices may be used on a single bus system. When the A0, A1, or A2 inputs are left floating, the input internally defaults to zero.
BM
Stop Condition
DEVICE OPERATION
24C02/04/08/16 features serial communication and supports a bi-directional 2-wire bus transmission protocol called I2CTM.
The EEPROM monitors the SDA and SCL lines and will not respond until the Start condition is met.
2-WIRE BUS
The two-wire bus is defined as a Serial Data line (SDA), and a Serial Clock line (SCL). The protocol defines any device that sends data onto the SDA bus as a transmitter, and the receiving devices as receivers. The bus is controlled by Master device that generates the SCL, controls the bus access, and generates the Stop and Start conditions. The 24C02/04/08/16 is the Slave device on the bus.
The Stop condition is defined as a Low to High transition of SDA when SCL is High. All operations must end with a Stop condition.
Acknowledge (ACK)
After a successful data transfer, each receiving device is required to generate an ACK. The Acknowledging device pulls down the SDA line.
Reset
The 24C02/04/08/16 contains a reset function in case the 2-wire bus transmission is accidentally interrupted (eg. a power loss), or needs to be terminated mid-stream. The reset is caused when the Master device creates a Start condition. To do this, it may be necessary for the Master device to monitor the SDA line while cycling the SCL up to nine times. (For each clock signal transition to High, the Master checks for a High level on SDA.)
Standby Mode
Power consumption is reduced in standby mode. The 24C02/04/08/16 will enter standby mode: a) At Power-up, and remain in it until SCL or SDA toggles; b) Following the Stop signal if a no write operation is initiated; or c) Following any internal write operation.
Start Condition
The Start condition precedes all commands to the device and is defined as a High to Low transition of SDA when SCL is High.
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WRITE OPERATION Byte Write
DEVICE ADDRESSING
The Master begins a transmission by sending a Start condition. The Master then sends the address of the particular Slave devices it is requesting. The Slave device (Fig. 5) address is 8 bits. The four most significant bits of the Slave address are fixed as 1010 for the 24C02/04/08/16. The next three bits of the Slave address are specific for each of the EEPROM. The bit values enable access to multiple memory blocks or multiple devices. The 24C02 uses the three bits A0, A1, and A2 in a comparison with the hard-wired input values on the A0, A1, and A2 pins. Up to eight 24C02 units may share the 2wire bus. The 24C04 uses the bit B0 to address either the upper or the lower 256 byte block in the device. Also, the bits A1 and A2 are used in a comparison with the hard-wired input values on the A1 and A2 pins. Up to four 24C04 units may share the 2-wire bus. The 24C08 uses the bits B0 and B1 to address one of the four 256 byte blocks in the device. Also, the bit A2 is used in a comparison with the hard-wired input value on the A2 pin. Up to two 24C08 units may share the 2-wire bus. The 24C16 uses the bits B0, B1, and B2 to address one of the eight 256 byte blocks in the device. The last bit of the Slave address specifies whether a Read or Write operation is to be performed. When this bit is set to 1, a Read operation is selected, and when set to 0, a Write operation is selected. After the Master transmits the Start condition and Slave address byte (Fig. 5), the appropriate 2-wire Slave (eg.24C02/04/08/16) will respond with ACK on the SDA line. The Slave will pull down the SDA on the ninth clock cycle, signaling that it received the eight bits of data. The selected EEPROM then prepares for a Read or Write operation by monitoring the bus.
In the Byte Write mode, the Master device sends the Start condition and the Slave address information (with the R/W set to Zero) to the Slave device. After the Slave generates an ACK, the Master sends the byte address that is to be written into the address pointer of the 24C02/04/08/ 16. After receiving another ACK from the Slave, the Master device transmits the data byte to be written into the address memory location. The 24C02/04/08/16 acknowledges once more and the Master generates the Stop condition, at which time the device begins its internal programming cycle. While this internal cycle is in progress, the device will not respond to any request from the Master device.
Page Write
The 24C02/04/08/16 is capable of 16-byte PageWrite operation. A Page-Write is initiated in the same manner as a Byte Write, but instead of terminating the internal Write cycle after the first data word is transferred, the Master device can transmit up to 15 more bytes. After the receipt of each data word, the EEPROM responds immediately with an ACK on SDA line, and the four lower order data word address bits are internally incremented by one, while the higher order bits of the data word address remain constant. If a byte address is incremented from the last byte of a page, it returns to the first byte of that page. If the Master device should transmit more than 16 bytes prior to issuing the Stop condition, the address counter will roll over, and the previously written data will be overwritten. Once all 16 bytes are received and the Stop condition has been sent by the Master, the internal programming cycle begins. At this point, all received data is written to the 24C02/04/08/16 in a single Write cycle. All inputs are disabled until completion of the internal Write cycle.
BM
Random Address Read
READ OPERATION
Read operations are initiated in the same manner as Write operations, except that the (R/W) bit of the Slave address is set to 1. There are three Read operation options: current address read, random address read and sequential read.
Selective Read operations allow the Master device to select at random any memory location for a Read operation. The Master device first performs a 'dummy' Write operation by sending the Start condition, Slave address and byte address of the location it wishes to read. After the 24C02/04/08/16 acknowledges the byte address, the Master device resends the Start condition and the Slave address, this time with the R/W bit set to one. The EEPROM then responds with its ACK and sends the data requested. The Master device does not send an ACK but will generate a Stop condition. (Refer to Figure 9. Random Address Read Diagram.)
Sequential Read
Sequential Reads can be initiated as either a Current Address Read or Random Address Read. After the 24C02/04/08/16 sends the initial byte sequence, the Master device now responds with an ACK indicating it requires additional data from the 24C02/04/08/ 16. The EEPROM continues to output data for each ACK received. The Master device terminates the sequential Read operation by pulling SDA High (no ACK) indicating the last data word to be read, followed by a Stop condition. The data output is sequential, with the data from address n followed by the data from address n+1,n+2 ... etc. The address counter increments by one automatically, allowing the entire memory contents to be serially read during sequential Read operation. When the memory address boundary of 255, 511, 1023, or 2047 (depending on the device) is reached, the address counter rolls over to address 0, and the device continues to output data. (Refer to Figure 10. Sequential Read Diagram).
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Vcc
SDA SCL
Master Transmitter/ Receiver
24Cxx
ACK
STOP Condition
SDA
START Condition
SCL
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Rev. F 01/09/06
BM
Data Change
SCL
Data Stable Data Stable
SDA
1
BIT 7
0
6
1
5
0
4
A2
3
A1
2
A0
1
R/W
0
24C02
1
BIT 7
0
6
1
5
0
4
A2
A1
B0
R/W
0
24C04
1
BIT 7
0
6
1
5
0
4
A2
B1
B0
R/W
24C08
1
MSB
B2
B1
B0
R/W LSB
24C16
S T A R T
Device Address
W R I T E A C K
Byte Address
Data A C K A C K
S T O P
M S B
L M S S B B R/W
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Rev. F 01/09/06
BM
Value 0.5 to +6.5 0.5 to Vcc + 0.5 55 to +125 65 to +150 5 Unit V V C C mA
Notes: 1. Stress greater than 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 above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
OPERATING RANGE
(IS24C02A-2, IS24C04A -2, IS24C08A -2, & IS24C16A -2) Range Commercial Industrial Ambient Temperature -5C to +75C 40C to +85C VCC 1.8V to 5.5V 1.8V to 5.5V
OPERATING RANGE
(IS24C02A-3, IS24C04A -3, IS24C08A -3, & IS24C16A -3) Range Commercial Industrial Automotive Ambient Temperature -5C to +75C 40C to +85C 40C to +125C VCC 2.5V to 5.5V 2.5V to 5.5V 2.5V to 5.5V
CAPACITANCE(1,2)
Symbol CIN COUT Parameter Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Max. 6 8 Unit pF pF
Notes: 1. Tested initially and after any design or process changes that may affect these parameters. 2. Test conditions: TA = 25C, f = 1 MHz, Vcc = 5.0V.
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Rev. F 01/09/07
BM
Min. Max. 0.2 0.4 VCC X 0.7 VCC + 0.5 1.0 VCC X 0.3 3 3 Unit V V V V A A
Notes: VIL min and VIH max are reference only and are not tested.
AC ELECTRICAL CHARACTERISTICS
Commercial (TA = -5oC to +75oC) Industrial (TA = -40oC to +85oC) 1.8V Vcc < 2.5V
Symbol fSCL T tLow tHigh tBUF tSU:STA tSU:STO tHD:STA tHD:STO tSU:DAT tHD:DAT tSU:WP tHD:WP tDH tAA tR tF tWR Parameter SCL Clock Frequency Noise Suppression Time(1) Clock Low Period Clock High Period Bus Free Time Before New Transmission(1) Start Condition Setup Time Stop Condition Setup Time Start Condition Hold Time Stop Condition Hold Time Data In Setup Time Data In Hold Time WP pin Setup Time WP pin Hold Time Data Out Hold Time (SCL Low to SDA Data Out Change) Clock to Output (SCL Low to SDA Data Out Valid) SCL and SDA Rise Time(1) SCL and SDA Fall Time(1) Write Cycle Time Min. 0 4.7 4 4.7 4 4 4 4 100 0 4 4.7 100 100 Max. 100 100 3500 1000 300 5
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01/09/06
10