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85C72/82/92
1K/2K/4K 5.0V CMOS Serial EEPROM
FEATURES
* * * * * * * * * * Low power CMOS technology Two wire serial interface bus, I2CTM compatible 5 volt only operation Self-timed write cycle (including auto-erase) Page-write buffer 1ms write cycle time for single byte 1,000,000 ERASE/WRITE cycles guaranteed Data retention >200 years 8-pin DIP or SOIC package Available for extended temperature ranges: - Commercial: 0C to +70C - Industrial: -40C to +85C - Automotive: -40C to +125C
PACKAGE TYPE
DIP
A0 A1 A2 VSS 1 2 3 4 8 V CC NC SCL SDA
85C72 85C82 85C92
7 6 5
8-lead SOIC
A0 A1 A2
1 2 3 4
8
V CC NC SCL SDA
85C72 85C82 85C92
7 6 5
85C72 Organization Page Write Buffer 128 x 8 2 Bytes
85C82 256 x 8 2 Bytes
85C92 2 x 256 x 8 8 Bytes 14-lead SOIC
VSS
NC A0
1 2 3 4 5 6 7
14 13 12
NC VCC NC NC SCL SDA NC
DESCRIPTION
The Microchip Technology Inc. 85C72/82/92 is a 1K/ 2K/4K bit Electrically Erasable PROM. The device is organized as shown with a two wire serial interface. Advanced CMOS technology allows a significant reduction in power over NMOS serial devices. The 85C72/82/92 also has a page-write capability for up to 8 bytes of data (see chart). Up to eight 85C72/82/92s may be connected to the two wire bus. The 85C72/82/ 92 is available in standard 8-pin DIP and surface mount SOIC packages.
A1 NC A2 VSS NC
85C92
11 10 9 8
BLOCK DIAGRAM
DATA BUFFER (FIF0) DATA REG. SDA
VCC VSS
VPP
R/W AMP
SLAVE ADR.
AP DO MEMORY DI RN ARRAY E T A0 to S E A7 SR INCREMENT
SCL
CONTROL LOGIC A0 A1 A2
I2C is a trademark of Philips Corporation
(c) 1995 Microchip Technology Inc.
DS11182C-page 1
85C72/82/92
1.0
1.1
ELECTRICAL CHARACTERISTICS
Maximum Ratings*
TABLE 1-1:
Name A0, A1, A2 VSS SDA SCL NC VCC
PIN FUNCTION TABLE
Function Chip Address Inputs Ground Serial Address/Data Input/Output Serial Clock No Connect +5V Power Supply
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
Commercial Industrial Automotive Symbol VTH VIH VIL VOL VIH VIL ILI ILO CIN, COUT ICCO Min 2.8 VCC x 0.7 -0.3 Max 4.5 VCC + 1 VCC X 0.3 0.4 VCC - 0.5 VCC + 0.5 -0.3 -- -- -- -- 0.5 10 10 7.0 3.5 4.25 (C): (I): (E): Units V V V V V V A A pF mA mA A A VIN = 0V TO Vcc VOUT = 0V TO Vcc VIN/VOUT = 0V (Note 1) Tamb = +25C, f = 1 MHz FCLK = 100 kHz, program cycle time = 1 ms, VCC = 5V, Tamb = 0C to +70C FCLK = 100 kHz, program cycle time = 1 ms, VCC = 5V, Tamb = (I) and (E) VCC = 5V, Tamb = (C), (I) and (E) SDA=SCL=VCC=5V (no PROGRAM active) IOL = 3.2 mA (SDA 0nly) Tamb = 0C to +70C Tamb = -40C to +85C Tamb = -40C to 125C Conditions
VCC = +5V (10%)
Parameter VCC detector threshold SCL and SDA pins: High level input voltage Low level input voltage Low level output voltage A0, A1 & A2 pins: HIgh level input voltage Low level input voltage Input leakage current Output leakage current Pin capacitance (all inputs/outputs) Operating current
read cycle Standby current
ICCR ICCS
-- --
750 100
Note 1: 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
DS11182C-page 2
(c) 1995 Microchip Technology Inc.
85C72/82/92
TABLE 1-3: AC CHARACTERISTICS
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 Data output delay time STOP condition setup time Bus free time Symbol FCLK THIGH TLOW TR TF THD:STA TSU:STA THD:DAT TSU:DAT TPD TSU:STO TBUF Min -- 4000 4700 -- -- 4000 4700 0 250 300 4700 4700 Typ -- -- -- -- -- -- -- -- -- -- -- -- Max 100 -- -- 1000 300 -- -- -- -- 3500 -- -- Units kHz ns ns ns ns ns ns ns ns ns ns ns Time the bus must be free before a new transmission can start Note 1 After this period the first clock pulse is generated Only relevant for repeated START condition Remarks
Input filter time constant (SDA and SCL pins) Program cycle time
TI TWC
-- --
-- .4 .4N
100 1 N
ns ms ms Byte Mode Page Mode, N = # of bytes to be written
Note 1: As transmitter the device must provide this 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.
FIGURE 1-2:
BUS TIMING DATA
tF t HIGH t LOW tR
SCL t SU:STA t HD:STA SDA IN t AA SDA OUT t AA t HD:DAT t SU:DAT t SU:STO
t BUF
(c) 1995 Microchip Technology Inc.
DS11182C-page 3
85C72/82/92
2.0 FUNCTIONAL DESCRIPTION
3.3 Stop Data Transfer (C)
The 85C72/82/92 supports a bidirectional two 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 85C72/82/92 works as slave. Both, master and slave can operate as transmitter or receiver, but the master device determines which mode is activated. Up to eight 85C72/82/92s can be connected to the bus, selected by the A0, A1 and A2 chip address inputs. Other devices can be connected to the bus, but require different device codes than the 85C72/82/92 (refer to section Slave Address). 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.
3.4
Data Valid (D)
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.
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 (see 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 85C72/82/92 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.
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. 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 must leave the data line HIGH to enable the master to generate the STOP condition
FIGURE 3-1:
(A) SCL (B)
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(D) (D) (C) (A)
SDA
START CONDITION
ADDRESS DATA ALLOWED OR TO CHANGE ACKNOWLEDGE VALID
STOP CONDITION
DS11182C-page 4
(c) 1995 Microchip Technology Inc.
85C72/82/92
4.0 SLAVE ADDRESS 5.0 BYTE PROGRAM MODE
The chip address inputs A0, A1 and A2 of each 85C72/ 82/92 must be externally connected to either VCC or ground (VSS), assigning to each 85C72/82/92 a unique 3-bit address. Up to eight 85C72/82/92s may be connected to the bus. Chip selection is then accomplished through software by setting the bits A0, A1 and A2 of the transmitted slave address to the corresponding hardwired logic levels of the selected 85C72/82/92. After generating a START condition, the bus master transmits the slave address consisting of a 4-bit device code (1010) for the 85C72/82/92, followed by the chip address bits A0, A1 and A2. In the 85C92 the seventh bit of that byte (BA) is used to select the upper block (addresses 100 - 1FF) or the lower block (000 - FFF) of the array. The eighth bit of slave address determines if the master device wants to read or write to the 85C72/82/92 (see Figure 4-1). The 85C72/82/92 monitors the bus for its corresponding slave address all the time. It generates an acknowledge bit if the slave address was true and it is not in a programming mode. In this mode, the master sends addresses and one data byte to the 85C72/82/92. Following the START condition, the device code (4-bit), the slave address (3-bit), and the R/W bit, which is logic LOW, are placed onto the bus by the master. This indicates to the addressed 85C72/82/92 that a byte with a word address will follow after it has generated an acknowledge bit. Therefore, the next byte transmitted by the master is the word address and will be written into the address pointer of the 85C72/82/92. After receiving the acknowledge of the 85C72/82/92, the master device transmits the data word to be written into the addressed memory location. The 85C72/82/92 acknowledges again and the master generates a STOP condition. This initiates the internal programming cycle of the 85C72/82/92 (see Figure 6-1).
6.0
PAGE PROGRAM MODE
FIGURE 4-1:
SLAVE ADDRESS ALLOCATION
READ/WRITE
START
SLAVE ADDRESS
R/W
A
1
0
1
0
A2
A1
A0
To program the 85C72/82/92, the master sends addresses and data to the 85C72/82/92 which is the slave (see Figure 6-1). This is done by supplying a START condition followed by the 4-bit device code, the 3-bit slave address, and the R/W bit which is defined as a logic LOW for a write. This indicates to the addressed slave that a word address will follow so the slave outputs the acknowledge pulse to the master during the ninth clock pulse. When the word address is received by the 85C72/82/92, it places it in the lower 8 bits of the address pointer defining which memory location is to be written. The 85C72/82/92 will generate an acknowledge after every 8 bits received and store them consecutively in a 2-byte RAM until a stop condition is detected which initiates the internal programming cycle. If more than 2 bytes are transmitted by the master, the 85C72/82/92 will terminate the write cycle. This does not affect erase/write cycles of the EEPROM array. If the master generates a STOP condition after transmitting the first data word (Point `P' on Figure 6-1), byte programming mode is entered. The internal, completely self-timed PROGRAM cycle starts after the STOP condition has been generated by the master and all received (up to two) data bytes will be written in a serial manner. The PROGRAM cycle takes N milliseconds, whereby N is the number of received data bytes (N max = 2).
FIGURE 6-1:
PROGRAM MODE (ERASE/WRITE)
ACKNOWLEDGES FROM SLAVE
START
SLAVE ADDRESS
0A
WORD ADDRESS
A
DATA BYTE 1
A
DATA BYTE N
A STOP
R/W
P
(c) 1995 Microchip Technology Inc.
DS11182C-page 5
85C72/82/92
7.0 ACKNOWLEDGE POLLING 8.0 READ MODE
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 7-1 for flow diagram. This mode illustrates master device reading data from the 85C72/82/92. As can be seen from Figure 8-1, the master first sets up the slave and word addresses by doing a write. Note: Although this is a read mode, the address pointer must be written to.
During this period the 85C72/82/92 generates the necessary acknowledge bits as defined in the appropriate section. The master now generates another START condition and transmits the slave address again, except this time the read/write bit is set into the read mode. After the slave generates the acknowledge bit, it then outputs the data from the addressed location on to the SDA pin, increments the address pointer and, if it receives an acknowledge from the master, will transmit the next consecutive byte. This autoincrement sequence is only aborted when the master sends a STOP condition instead of an acknowledge. Note 1: If the master knows where the address pointer is, it can begin the read sequence at point `R' indicated on Figure 8-1 and save time transmitting the slave and word addresses. Note 2: In all modes, the address pointer will automatically increment from the end of the memory block (256 byte) back to the first location in that block.
FIGURE 7-1:
ACKNOWLEDGE POLLING FLOW
Send Write Command
Send Stop Condition to Initiate Write Cycle
Send Start
Send Control Byte with R/W = 0
Did Device Acknowledge (ACK = 0)? Yes Next Operation
No
FIGURE 8-1:
READ MODE
ACKNOWLEDGES FROM SLAVE RECEIVER ACKNOWLEDGES FROM MASTER RECEIVER
START
SLAVE ADDRESS
0 A WORD ADDRESS A START
SLAVE ADDRESS
1A
DATA BYTE 1
A
LAST DATA BYTE
STOP
R/W
R
R/W
AUTO INCREMENT WORD ADDRESS
DS11182C-page 6
(c) 1995 Microchip Technology Inc.
85C72/82/92
9.0
9.1
PIN DESCRIPTION
A0, A1 and A2 Chip Address Inputs
The levels on these inputs are compared with the corresponding bits in the slave address. The chip is selected if the compare is true. For 85C92, A0 is no function. Up to eight 85C72/82s or four 85C92s can be connected to the bus. These inputs must be connected to either VSS or VCC.
9.2
SDA Serial Address/Data Input/Output
This is a bidirectional 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 pullup resistor to VCC (typical 10KW). 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.
9.3
SCL Serial Clock
This input is used to synchronize the data transfer from and to the device.
9.4
NC No Connect
This pin can be left open or used as a tie point. Note 1: A "page" is defined as the maximum number of bytes that can be programmed in a single write cycle. The 85C72/82 page is 2 bytes long and the 85C92 page is 8 bytes long. Note 2: A "block" is defined as a continuous area of memory with distinct boundaries. The address pointer can not cross the boundary from one block to another. It will, however, wrap around from the end of a block to the first location in the same block. The 85C72/82 has only one block (256 bytes), while the 85C92 has two blocks of 256 bytes each.
(c) 1995 Microchip Technology Inc.
DS11182C-page 7
85C72/82/92
85C72/82/92 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.
85C82
- /P
Package:
P = Plastic DIP (300 mil Body), 8-lead SM = Plastic SOIC (207 mil Body), 8-lead SL = Plastic SOIC 14-lead (85C92 only) Blank = 0C to +70C I = -40C to +85C E = -40C to +125C 85C72 85C72T 85C82 85C82 85C92 85C92T 1K CMOS Serial EEPROM 1K CMOS Serial EEPROM (Tape and Reel) 2K CMOS Serial EEPROM 2K CMOS Serial EEPROM (Tape and Reel) 4K CMOS Serial EEPROM 4K CMOS Serial EEPROM (Tape and Reel) EUROPE
United Kingdom Arizona Microchip Technology Ltd. Unit 6, The Courtyard Meadow Bank, Furlong Road Bourne End, Buckinghamshire SL8 5AJ Tel: 44 0 1628 851077 Fax: 44 0 1628 850259 France Arizona Microchip Technology SARL 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 Colleoni Palazzo Pegaso Ingresso No. 2 Via Paracelso 23, 20041 Agrate Brianza (MI) Italy Tel: 39 039 689 9939 Fax: 39 039 689 9883
Temperature Range: Device:
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.mchip.com/biz/mchip 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: 214 991-7177 Fax: 214 991-8588 Dayton Microchip Technology Inc. 35 Rockridge Road Englewood, OH 45322 Tel: 513 832-2543 Fax: 513 832-2841 Los Angeles Microchip Technology Inc. 18201 Von Karman, Suite 455 Irvine, CA 92715 Tel: 714 263-1888 Fax: 714 263-1338 New York Microchip Technology Inc. 150 Motor Parkway, Suite 416 Hauppauge, NY 11788 Tel: 516 273-5305 Fax: 516 273-5335
AMERICAS (continued)
San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408 436-7950 Fax: 408 436-7955
ASIA/PACIFIC
Hong Kong Microchip Technology Unit No. 3002-3004, Tower 1 Metroplaza 223 Hing Fong Road Kwai Fong, N.T. Hong Kong Tel: 852 2 401 1200 Fax: 852 2 401 3431 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 Microchip Technology 10F-1C 207 Tung Hua North Road Taipei, Taiwan, ROC Tel: 886 2 717 7175 Fax: 886 2 545 0139
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 9/5/95
Printed in the USA, 9/95 (c) 1995, Microchip Technology Incorporated
"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 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.
DS11182C-page 8
(c) 1995 Microchip Technology Inc.

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