View 24C08_246550.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

24C08B/16B
8K/16K 5.0V I2CTM Serial EEPROMs
FEATURES
* Single supply with operation from 4.5-5.5V * Low power CMOS technology - 1 mA active current typical - 10 A standby current typical at 5.5V * Organized as 4 or 8 blocks of 256 bytes (4 x 256 x 8) or (8 x 256 x 8) * 2-wire serial interface bus, I2CTM compatible * Schmitt trigger, filtered inputs for noise suppression * Output slope control to eliminate ground bounce * 100 kHz compatibility * Self-timed write cycle (including auto-erase) * Page-write buffer for up to 16 bytes * 2 ms typical write cycle time for page-write * Hardware write protect for entire memory * Can be operated as a serial ROM * ESD protection > 4,000V * 1,000,000 ERASE/WRITE cycles guaranteed * Data retention > 200 years * 8-pin DIP, 8-lead or 14-lead SOIC packages * Available for extended temperature range - Automotive (E): -40C to +125C
PACKAGE TYPES
PDIP A0 A1 A2 VSS 1 24C08B/16B 2 3 4 8 7 6 5 VCC WP SCL SDA
8-lead SOIC
A0 A1 A2 VSS
1
24C08B/16B
8 7 6 5
VCC WP SCL SDA
2 3 4
14-lead SOIC
NC A0 A1 NC A2 VSS NC
1 2 3 4 5 6 7
14 13
NC VCC WP NC SCL SDA NC
24C08B/16B
12 11 10 9 8
DESCRIPTION
The Microchip Technology Inc. 24C08B/16B is an 8K or 16K bit Electrically Erasable PROM intended for use in extended/automotive temperature ranges. The device is organized as four or eight blocks of 256 x 8-bit memory with a 2-wire serial interface. The 24C08B/16B also has a page-write capability for up to 16 bytes of data. The 24C08B/16B is available in the standard 8-pin DIP and both 8-lead and 14-lead surface mount SOIC packages.
BLOCK DIAGRAM
WP HV GENERATOR
I/O CONTROL LOGIC
MEMORY CONTROL LOGIC
XDEC
EEPROM ARRAY PAGE LATCHES
SDA
SCL YDEC
VCC VSS
SENSE AMP R/W CONTROL
I2C is a trademark of Philips Corporation.
(c) 1996 Microchip Technology Inc.
DS21081D-page 1
This document was created with FrameMaker 4 0 4
24C08B/16B
1.0
1.1
ELECTRICAL CHARACTERISTICS
Maximum Ratings*
TABLE 1-1:
Name VSS SDA SCL WP VCC A0, A1, A2
PIN FUNCTION TABLE
Function Ground Serial Address/Data I/O Serial Clock Write Protect Input +4.5V to 5.5V Power Supply No Internal Connection
VCC...................................................................................7.0V All inputs and outputs w.r.t. VSS ............... -0.6V to VCC +1.0V Storage temperature ..................................... -65C to +150C Ambient temp. with power applied ................ -65C to +125C Soldering temperature of leads (10 seconds) ............. +300C ESD protection on all pins .................................................. 4 kV
*Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
TABLE 1-2:
DC CHARACTERISTICS
VCC = +4.5V to +5.5V Automotive (E): Tamb = -40C to +125C Parameter Symbol VIH VIL VHYS VOL ILI ILO CIN, COUT ICC write ICC read ICCS Min .7 Vcc -- .05 Vcc -- -10 -10 -- -- -- -- Max -- .3 VCC -- .40 10 10 10 3 1 100 Units V V V V A A pF mA mA A Conditions
WP, SCL and SDA pins: High level input voltage Low Level input voltage Hysteresis of Schmitt trigger inputs Low level output voltage Input leakage current Output leakage current Pin capacitance (all inputs/outputs) Operating current Standby current
Note:
(Note) IOL = 3.0 mA, VCC=4.5V VIN =.1V to VCC VOUT = .1V to VCC VCC = 5.0V (Note 1) Tamb = 25C, FCLK=1 MHz VCC = 5.5V, SCL = 400 kHz VCC = 5.5V, SDA = SCL = VCC
This parameter is periodically sampled and not 100% tested.
FIGURE 1-1:
BUS TIMING START/STOP
VHYS
SCL TSU:STA SDA THD:STA TSU:STO
START
STOP
DS21081D-page 2
(c) 1996 Microchip Technology Inc.
24C08B/16B
TABLE 1-3: AC CHARACTERISTICS
Symbol FCLK THIGH TLOW TR TF THD:STA TSU:STA THD:DAT TSU:DAT TSU:STO TAA TBUF TOF TSP TWR -- -- Min -- 4000 4700 -- -- 4000 4700 0 250 4000 -- 4700 -- -- -- 1M 10M Max 100 -- -- 1000 300 -- -- -- -- -- 3500 -- 250 50 10 -- -- Units kHz ns ns ns ns ns ns ns ns ns ns ns ns ns ms cycles Remarks
Parameter Clock frequency Clock high time Clock low time SDA and SCL rise time SDA and SCL fall time START condition hold time START condition setup time Data input hold time Data input setup time STOP condition setup time Output valid from clock Bus free time Output fall time from VIH min to VIL max Input filter spike suppression (SDA and SCL pins) Write cycle time Endurance 24C08B 24C16B
(Note1) (Note 1) After this period the first clock pulse is generated Only relevant for repeated START condition
(Note 2) Time the bus must be free before a new transmission can start (Note 1), CB 100 pF (Note 3) Byte or Page mode 25C, VCC = 5.0V, Block Mode (Note 4)
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF. 2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region (minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions. 3: The combined TSP and VHYS specifications are due to new Schmitt trigger inputs which provide improved noise and spike suppression. This eliminates the need for a TI specification. 4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific application, please consult the Total Endurance Model which can be obtained on our BBS or website.
FIGURE 1-2:
BUS TIMING DATA
TF THIGH TLOW TR
SCL TSU:STA SDA IN THD:STA TSP TAA TBUF THD:DAT TSU:DAT TSU:STO
TAA SDA OUT
THD:STA
(c) 1996 Microchip Technology Inc.
DS21081D-page 3
24C08B/16B
2.0 FUNCTIONAL DESCRIPTION
3.4 Data Valid (D)
The 24C08B/16B supports a Bi-directional 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, and a device receiving data as receiver. The bus has to be controlled by a master device which generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions, while the 24C08B/16B works as slave. Both, master and slave can operate as transmitter or receiver but the master device determines which mode is activated. The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of the data bytes transferred between the START and STOP conditions is determined by the master device and is theoretically unlimited, although only the last 16 will be stored when doing a write operation. When an overwrite does occur it will replace data in a first in first out fashion.
3.0
BUS CHARACTERISTICS
The following bus protocol has been defined: * Data transfer may be initiated only when the bus is not busy. * During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH will be interpreted as a START or STOP condition. Accordingly, the following bus conditions have been defined (Figure 3-1).
3.5
Acknowledge
Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The master device must generate an extra clock pulse which is associated with this acknowledge bit. Note: The 24C08B/16B does not generate any acknowledge bits if an internal programming cycle is in progress.
3.1
Bus not Busy (A)
Both data and clock lines remain HIGH.
3.2
Start Data Transfer (B)
A HIGH to LOW transition of the SDA line while the clock (SCL) is HIGH determines a START condition. All commands must be preceded by a START condition.
3.3
Stop Data Transfer (C)
A LOW to HIGH transition of the SDA line while the clock (SCL) is HIGH determines a STOP condition. All operations must be ended with a STOP condition.
The device that acknowledges, has to pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Of course, setup and hold times must be taken into account. During reads, a master must signal an end of data to the slave by NOT generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave (24C08B/16B) will leave the data line HIGH to enable the master to generate the STOP condition.
FIGURE 3-1:
(A) (B)
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(D) (D) (C) (A)
SCL
SDA
START CONDITION
ADDRESS OR ACKNOWLEDGE VALID
DATA ALLOWED TO CHANGE
STOP CONDITION
DS21081D-page 4
(c) 1996 Microchip Technology Inc.
24C08B/16B
3.6 Device Addressing
4.0
4.1
WRITE OPERATION
Byte Write
A control byte is the first byte received following the start condition from the master device. The control byte consists of a 4-bit control code, for the 24C08B/16B this is set as 1010 binary for read and write operations. The next three bits of the control byte are the block select bits (B2, B1, B0). They are used by the master device to select which of the eight 256 word blocks of memory are to be accessed. These bits are in effect the three most significant bits of the word address. The last bit of the control byte defines the operation to be performed. When set to one a read operation is selected, when set to zero a write operation is selected. Following the start condition, the 24C08B/16B monitors the SDA bus checking the device type identifier being transmitted, upon a 1010 code the slave device outputs an acknowledge signal on the SDA line. Depending on the state of the R/W bit, the 24C08B/16B will select a read or write operation. Operation Read Write Control Code 1010 1010 Block Select Block Address Block Address R/W 1 0
Following the start condition from the master, the device code (4 bits), the block address (3 bits), and the R/W bit which is a logic low is placed onto the bus by the master transmitter. This indicates to the addressed slave receiver that a byte with a word address will follow after it has generated an acknowledge bit during the ninth clock cycle. Therefore the next byte transmitted by the master is the word address and will be written into the address pointer of the 24C08B/16B. After receiving another acknowledge signal from the 24C08B/16B the master device will transmit the data word to be written into the addressed memory location. The 24C08B/16B acknowledges again and the master generates a stop condition. This initiates the internal write cycle, and during this time the 24C08B/16B will not generate acknowledge signals (Figure 4-1).
4.2
Page Write
FIGURE 3-2:
START
CONTROL BYTE ALLOCATION
READ/WRITE
SLAVE ADDRESS
R/W
A
1
0
1
0
B2
B1
B0
The write control byte, word address and the first data byte are transmitted to the 24C08B/16B in the same way as in a byte write. But instead of generating a stop condition the master transmits up to 16 data bytes to the 24C08B/16B which are temporarily stored in the onchip page buffer and will be written into the memory after the master has transmitted a stop condition. After the receipt of each word, the four lower order address pointer bits are internally incremented by one. The higher order seven bits of the word address remains constant. If the master should transmit more than 16 words prior to generating the stop condition, the address counter will roll over and the previously received data will be overwritten. As with the byte write operation, once the stop condition is received an internal write cycle will begin (Figure 4-2).
FIGURE 4-1:
BUS ACTIVITY MASTER
BYTE WRITE
S T A R T CONTROL BYTE WORD ADDRESS DATA S T O P
SDA LINE
S
A C K A C K A C K
P
BUS ACTIVITY
FIGURE 4-2:
BUS ACTIVITY MASTER
PAGE WRITE
S T A R T CONTROL BYTE WORD ADDRESS (n) DATA n DATA n + 1 DATA n + 15 S T O P
SDA LINE BUS ACTIVITY
S
A C K A C K A C K A C K A C K
P
(c) 1996 Microchip Technology Inc.
DS21081D-page 5
24C08B/16B
5.0 ACKNOWLEDGE POLLING
7.1 Current Address Read
Since the device will not acknowledge during a write cycle, this can be used to determine when the cycle is complete (this feature can be used to maximize bus throughput). Once the stop condition for a write command has been issued from the master, the device initiates the internally timed write cycle. ACK polling can be initiated immediately. This involves the master sending a start condition followed by the control byte for a write command (R/W = 0). If the device is still busy with the write cycle, then no ACK will be returned. If the cycle is complete, then the device will return the ACK and the master can then proceed with the next read or write command. See Figure 5-1 for flow diagram. The 24C08B/16B contains an address counter that maintains the address of the last word accessed, internally incremented by one. Therefore, if the previous access (either a read or write operation) was to address n, the next current address read operation would access data from address n + 1. Upon receipt of the slave address with R/W bit set to one, the 24C08B/ 16B issues an acknowledge and transmits the 8-bit data word. The master will not acknowledge the transfer but does generate a stop condition and the 24C08B/ 16B discontinues transmission (Figure 7-1).
7.2
Random Read
FIGURE 5-1:
ACKNOWLEDGE POLLING FLOW
Send Write Command
Send Stop Condition to Initiate Write Cycle
Send Start
Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, first the word address must be set. This is done by sending the word address to the 24C08B/16B as part of a write operation. After the word address is sent, the master generates a start condition following the acknowledge. This terminates the write operation, but not before the internal address pointer is set. Then the master issues the control byte again but with the R/W bit set to a one. The 24C08B/16B will then issue an acknowledge and transmits the 8-bit data word. The master will not acknowledge the transfer but does generate a stop condition and the 24C08B/16B discontinues transmission (Figure 7-2).
7.3
Send Control Byte with R/W = 0
Sequential Read
Did Device Acknowledge (ACK = 0)? YES Next Operation
NO
Sequential reads are initiated in the same way as a random read except that after the 24C08B/16B transmits the first data byte, the master issues an acknowledge as opposed to a stop condition in a random read. This directs the 24C08B/16B to transmit the next sequentially addressed 8 bit word (Figure 7-3). To provide sequential reads the 24C08B/16B contains an internal address pointer which is incremented by one at the completion of each operation. This address pointer allows the entire memory contents to be serially read during one operation.
7.4
Noise Protection
6.0
WRITE PROTECTION
The 24C08B/16B can be used as a serial ROM when the WP pin is connected to VCC. Programming will be inhibited and the entire memory will be write-protected.
The 24C08B/16B employs a VCC threshold detector circuit which disables the internal erase/write logic if the VCC is below 1.5 volts at nominal conditions. The SCL and SDA inputs have Schmitt trigger and filter circuits which suppress noise spikes to assure proper device operation even on a noisy bus.
7.0
READ OPERATION
Read operations are initiated in the same way as write operations with the exception that the R/W bit of the slave address is set to one. There are three basic types of read operations: current address read, random read, and sequential read.
DS21081D-page 6
(c) 1996 Microchip Technology Inc.
24C08B/16B
FIGURE 7-1: CURRENT ADDRESS READ
S T A R T CONTROL BYTE DATA n S T O P BUS ACTIVITY MASTER
SDA LINE
S
A C K N O A C K
P
BUS ACTIVITY
FIGURE 7-2:
RANDOM READ
S T A R T CONTROL BYTE WORD ADDRESS (n) S T A R T CONTROL BYTE S T O P
BUS ACTIVITY MASTER
DATA (n)
S
SDA LINE A C K A C K
S
A C K N O A C K
P
BUS ACTIVITY
FIGURE 7-3:
SEQUENTIAL READ
CONTROL BYTE S T O P
BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY
DATA n
DATA n + 1
DATA n + 2
DATA n + X
P
A C K A C K A C K A C K N O A C K
8.0
8.1
PIN DESCRIPTIONS
SDA Serial Address/Data Input/Output
8.3
WP
This pin must be connected to either VSS or VCC. If tied to VSS, normal memory operation is enabled (read/write the entire memory 000-7FF). If tied to VCC, WRITE operations are inhibited. The entire memory will be write-protected. Read operations are not affected. This feature allows the user to use the 24C08B/16B as a serial ROM when WP is enabled (tied to VCC).
This is a Bi-directional pin used to transfer addresses and data into and data out of the device. It is an open drain terminal, therefore the SDA bus requires a pull-up resistor to VCC (typical 10). For normal data transfer SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the START and STOP conditions.
8.4
A0, A1, A2
8.2
SCL Serial Clock
This input is used to synchronize the data transfer from and to the device.
These pins are not used by the 24C08B/16B. They may be left floating or tied to either VSS or VCC.
(c) 1996 Microchip Technology Inc.
DS21081D-page 7
24C08B/16B
NOTES:
DS21081D-page 8
(c) 1996 Microchip Technology Inc.
24C08B/16B
NOTES:
(c) 1996 Microchip Technology Inc.
DS21081D-page 9
24C08B/16B
NOTES:
DS21081D-page 10
(c) 1996 Microchip Technology Inc.
24C08B/16B
24C08B/16B Product Identification System
To order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory or the listed sales offices.
24C08B/16B
-
E
/P Package: P = Plastic DIP (300 mil Body), 8-lead SL = Plastic SOIC (150 mil Body), 14-lead SN = Plastic SOIC (150 mil Body), 8-lead E = -40C to +125C 24C08B 24C08BT 24C16B 24C16BT 8K I2C Serial EEPROM 8K I2C Serial EEPROM (Tape and Reel) 16K I2C Serial EEPROM 16K I2C Serial EEPROM (Tape and Reel)
Temperature Range: Device:
(c) 1996 Microchip Technology Inc.
DS21081D-page 11
WORLDWIDE SALES & SERVICE
AMERICAS
Corporate Office Microchip Technology Inc. 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 602 786-7200 Fax: 602 786-7277 Technical Support: 602 786-7627 Web: http://www.microchip.com Atlanta Microchip Technology Inc. 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770 640-0034 Fax: 770 640-0307 Boston Microchip Technology Inc. 5 Mount Royal Avenue Marlborough, MA 01752 Tel: 508 480-9990 Fax: 508 480-8575 Chicago Microchip Technology Inc. 333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 708 285-0071 Fax: 708 285-0075 Dallas Microchip Technology Inc. 14651 Dallas Parkway, Suite 816 Dallas, TX 75240-8809 Tel: 972 991-7177 Fax: 972 991-8588 Dayton Microchip Technology Inc. Suite 150 Two Prestige Place Miamisburg, OH 45342 Tel: 513 291-1654 Fax: 513 291-9175 Los Angeles Microchip Technology Inc. 18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 714 263-1888 Fax: 714 263-1338 New York Microchip Technmgy Inc. 150 Motor Parkway, Suite 416 Hauppauge, NY 11788 Tel: 516 273-5305 Fax: 516 273-5335 San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408 436-7950 Fax: 408 436-7955 Toronto Microchip Technology Inc. 5925 Airport Road, Suite 200 Mississauga, Ontario L4V 1W1, Canada Tel: 905 405-6279 Fax: 905 405-6253
ASIA/PACIFIC
China Microchip Technology Unit 406 of Shanghai Golden Bridge Bldg. 2077 Yan'an Road West, Hongiao District Shanghai, Peoples Republic of China Tel: 86 21 6275 5700 Fax: 011 86 21 6275 5060 Hong Kong Microchip Technology RM 3801B, Tower Two Metroplaza 223 Hing Fong Road Kwai Fong, N.T. Hong Kong Tel: 852 2 401 1200 Fax: 852 2 401 3431 India Microchip Technology No. 6, Legacy, Convent Road Bangalore 560 025 India Tel: 91 80 526 3148 Fax: 91 80 559 9840 Korea Microchip Technology 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku, Seoul, Korea Tel: 82 2 554 7200 Fax: 82 2 558 5934 Singapore Microchip Technology 200 Middle Road #10-03 Prime Centre Singapore 188980 Tel: 65 334 8870 Fax: 65 334 8850 Taiwan, R.O.C Microchip Technology 10F-1C 207 Tung Hua North Road Taipei, Taiwan, ROC Tel: 886 2 717 7175 Fax: 886 2 545 0139
EUROPE
United Kingdom Arizona Microchip Technology Ltd. Unit 6, The Courtyard Meadow Bank, Furlong Road Bourne End, Buckinghamshire SL8 5AJ Tel: 44 1628 850303 Fax: 44 1628 850178 France Arizona Microchip Technology SARL Zone Industrielle de la Bonde 2 Rue du Buisson aux Fraises 91300 Massy - France Tel: 33 1 69 53 63 20 Fax: 33 1 69 30 90 79 Germany Arizona Microchip Technology GmbH Gustav-Heinemann-Ring 125 D-81739 Muenchen, Germany Tel: 49 89 627 144 0 Fax: 49 89 627 144 44 Italy Arizona Microchip Technology SRL Centro Direzionale Colleone Pas Taurus 1 Viale Colleoni 1 20041 Agrate Brianza Milan Italy Tel: 39 39 6899939 Fax: 39 39 689 9883
JAPAN
Microchip Technology Intl. Inc. Benex S-1 6F 3-18-20, Shin Yokohama Kohoku-Ku, Yokohama Kanagawa 222 Japan Tel: 81 45 471 6166 Fax: 81 45 471 6122
9/3/96
All rights reserved. (c) 1996, Microchip Technology Incorporated, USA. 9/96
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.
DS21081D-page 12
(c) 1996 Microchip Technology Inc.

▲Up To Search▲

Price & Availability of 24C08

	To Download 24C08 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .