24LC04B-E/SNVAO [MICROCHIP]
512 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8, 3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8;
| 型号： | 24LC04B-E/SNVAO |
| 厂家： | 
MICROCHIP |
| 描述： | 512 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8, 3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8 可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器 |
| 文件： | 总12页 (文件大小：80K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
24LC04B/08B
2
4K/8K 2.5V I C Serial EEPROMs
FEATURES
PACKAGE TYPES
PDIP
• Single supply with operation down to 2.5V
• Low power CMOS technology
A0
A1
1
2
8
7
VCC
WP
- 1 mA active current typical
- 10 µA standby current typical at 5.5V
- 5 µA standby current typical at 3.0V
A2
3
4
6
5
SCL
SDA
• Organized as two or four blocks of 256 bytes
(2 x 256 x 8) and (4 x 256 x 8)
VSS
• 2-wire serial interface bus, I2C compatible
• Schmitt trigger, filtered inputs for noise suppres-
sion
8-lead
SOIC
1
2
8
7
• Output slope control to eliminate ground bounce
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to 16 bytes
A0
A1
VCC
WP
3
4
6
5
A2
SCL
SDA
• 2 ms typical write cycle time for page-write
• Hardware write protect for entire memory
• Can be operated as a serial ROM
VSS
14-lead
SOIC
• Factory programming (QTP) available
• ESD protection > 4,000V
14
1
NC
NC
A0
• 1,000,000 erase/write cycles guaranteed
• Data retention > 200 years
13
12
11
2
3
4
5
6
7
VCC
WP
NC
• 8-pin DIP, 8-lead or 14-lead SOIC packages
• Available for extended temperature ranges
A1
NC
- Commercial (C):
- Industrial (I):
0°C to +70°C
-40°C to +85°C
10
9
SCL
SDA
NC
A2
VSS
NC
DESCRIPTION
8
The Microchip Technology Inc. 24LC04B/08B is a 4K or
8K bit Electrically Erasable PROM. The device is orga-
nized as two or four blocks of 256 x 8-bit memory with
a 2-wire serial interface. Low voltage design permits
operation down to 2.5 volts with typical standby and
active currents of only 5 µA and 1 mA respectively. The
24LC04B/08B also has a page-write capability for up to
16 bytes of data. The 24LC04B/08B is available in the
standard 8-pin DIP and both 8-lead and 14-lead surface
mount SOIC packages.
BLOCK DIAGRAM
WP
HV GENERATOR
EEPROM ARRAY
(2 x 256 x 8) or
(4 X 256 X 8)
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
PAGE LATCHES
SDA
SCL
YDEC
VCC
SENSE AMP
R/W CONTROL
V
SS
I2C is a trademark of Philips Corporation.
1996 Microchip Technology Inc.
DS21051E-page 1
24LC04B/08B
TABLE 1-1:
Name
PIN FUNCTION TABLE
Function
1.0
ELECTRICAL CHARACTERISTICS
1.1
Maximum Ratings*
VSS
SDA
Ground
VCC...................................................................................7.0V
All inputs and outputs w.r.t. VSS .............. -0.3V to VCC + 1.0V
Storage temperature ..................................... -65˚C to +150˚C
Ambient temp. with power applied ................ -65˚C to +125˚C
Soldering temperature of leads (10 seconds) ............. +300˚C
ESD protection on all pins..................................................≥ 4 kV
Serial Address/Data I/O
Serial Clock
SCL
WP
Write Protect Input
+2.5V to 5.5V Power Supply
No Internal Connection
VCC
A0, A1, A2
*Notice: Stresses above those listed under “Maximum ratings”
may cause permanent damage to the device. This is a stress rat-
ing 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 = +2.5V to +5.5V
Commercial (C): Tamb = 0˚C to +70˚C
Industrial
(I): Tamb = -40˚C to +85˚C
Parameter
Symbol
Min
Max
Units
WP, SCL and SDA pins:
High level input voltage
Low level input voltage
Hysteresis of Schmitt trigger
Inputs
VIH
VIL
VHYS
.7 VCC
—
.05 VCC
—
.3 VCC
—
V
V
V
(Note)
Low level output voltage
VOL
ILI
—
-10
-10
—
.40
10
10
10
V
IOL = 3.0mA, VCC = 2.5V
VIN = .1V to VCC
Input leakage current
Output leakage current
µA
µA
pF
ILO
VOUT = .1V to VCC
Pin capacitance
CIN, COUT
VCC = 5.0V (Note)
(all inputs/outputs)
Tamb = 25˚C, Fclk = 1 MHz
Operating current
ICC WRITE
ICC READ
—
—
3
1
mA
mA
VCC = 5.5V, SCL = 400 kHz
Standby current
ICCS
—
—
30
100
µA
µA
VCC = 3.0V, SDA = SCL = VCC
VCC = 5.5V, SDA = SCL = VCC
Note: This parameter is periodically sampled and not 100% tested.
FIGURE 1-1: BUS TIMING START/STOP
VHYS
SCL
THD:STA
TSU:STA
TSU:STO
SDA
START
STOP
DS21051E-page 2
1996 Microchip Technology Inc.
24LC04B/08B
TABLE 1-3:
AC CHARACTERISTICS
STANDARD
MODE
VCC = 4.5 - 5.5V
FAST MODE
Parameter
Symbol
Units
Remarks
Min
Max
Min
Max
Clock frequency
FCLK
THIGH
TLOW
TR
—
4000
4700
—
100
—
—
600
1300
—
400
—
kHz
ns
Clock high time
Clock low time
—
—
ns
SDA and SCL rise time
SDA and SCL fall time
START condition hold time
1000
300
—
300
300
—
ns
(Note 1)
(Note 1)
TF
—
—
ns
THD:STA
4000
600
ns
After this period the first clock
pulse is generated
START condition setup time
TSU:STA
4700
—
600
—
ns
Only relevant for repeated
START condition
Data input hold time
Data input setup time
STOP condition setup time
Output valid from clock
Bus free time
THD:DAT
TSU:DAT
TSU:STO
TAA
0
—
—
0
—
—
ns
ns
ns
ns
ns
250
4000
—
100
600
—
—
—
3500
—
900
—
(Note 2)
TBUF
4700
1300
Time the bus must be free
before a new transmission can
start
Output fall time from VIH min
to VIL max
TOF
TSP
TWR
—
—
—
250
50
20 +0.1
CB
250
50
ns
ns
(Note 1), CB ≤ 100 pF
Input filter spike suppression
(SDA and SCL pins)
—
(Note 3)
Write cycle time
10
—
10
ms
Byte or Page mode
Endurance
24LC04B
24LC08B
25°C, Vcc = 5.0V, Block Mode
(Note 4)
—
—
10M
1M
—
—
10M
1M
—
—
cycles
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 for standard operation.
4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific appli-
cation, please consult the Total Endurance Model whcih can be obtained on our BBS or website.
FIGURE 1-2: BUS TIMING DATA
TR
TF
THIGH
TLOW
SCL
TSU:STA
THD:DAT
TSU:DAT
TSU:STO
THD:STA
SDA
IN
TSP
TBUF
TAA
TAA
THD:STA
SDA
OUT
1996 Microchip Technology Inc.
DS21051E-page 3
24LC04B/08B
3.4
Data Valid (D)
2.0
FUNCTIONAL DESCRIPTION
The 24LC04B/08B 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 24LC04B/08B
works as slave. Both, master and slave can operate as
transmitter or receiver but the master device deter-
mines 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.
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.
Accordingly, the following bus conditions have been
defined (Figure 3-1).
Note: The 24LC04B/08B does not generate any
acknowledge bits if an internal program-
ming cycle is in progress.
3.1
Bus not Busy (A)
Both data and clock lines remain HIGH.
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.
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.
FIGURE 3-1: DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(A)
(B)
(D)
(D)
(C)
(A)
SCL
SDA
START
CONDITION
STOP
CONDITION
ADDRESS OR
ACKNOWLEDGE
VALID
DATA
ALLOWED
TO CHANGE
DS21051E-page 4
1996 Microchip Technology Inc.
24LC04B/08B
3.6
Device Addressing
4.0
WRITE OPERATION
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 24LC04B/08B
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). B2 is a don't care for both the
24LC04B and 24LC08B; B1 is a don't care for the
24LC04B. They are used by the master device to select
which of the two or four 256 word blocks of memory are
to be accessed. These bits are in effect the most sig-
nificant bits of the word address.
4.1
Byte Write
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 24LC04B/08B. After
receiving another acknowledge signal from the
24LC04B/08B the master device will transmit the data
word to be written into the addressed memory location.
The 24LC04B/08B acknowledges again and the master
generates a stop condition. This initiates the internal
write cycle, and during this time the 24LC04B/08B will
not generate acknowledge signals (Figure 4-1).
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 24LC04B/08B moni-
tors 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 24LC04B/
08B will select a read or write operation.
4.2
Page Write
The write control byte, word address and the first data
byte are transmitted to the 24LC04B/08B 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 24LC04B/08B which are temporarily stored in the
on-chip 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 inter-
nal write cycle will begin (Figure 4-2).
Control
Code
Operation
Block Select
R/W
Read
Write
1010
1010
Block Address
Block Address
1
0
FIGURE 3-2: CONTROL BYTE
ALLOCATION
START
READ/WRITE
SLAVE ADDRESS
R/W A
1
0
1
0
X
B1
B0
X = Don’t care. B1 is don’t care for 24LC04B.
FIGURE 4-1: BYTE WRITE
S
T
A
R
T
S
BUS ACTIVITY
MASTER
CONTROL
BYTE
WORD
ADDRESS
T
DATA
O
P
SDA LINE
S
P
A
C
K
A
C
K
A
C
K
BUS ACTIVITY
FIGURE 4-2: PAGE WRITE
S
BUS ACTIVITY
MASTER
T
A
R
T
S
T
O
P
CONTROL
BYTE
WORD
ADDRESS (n)
DATA n
DATA n + 1
DATA n + 15
SDA LINE
S
P
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
BUS ACTIVITY
1996 Microchip Technology Inc.
DS21051E-page 5
24LC04B/08B
5.0
ACKNOWLEDGE POLLING
7.0
READ OPERATION
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 com-
mand has been issued from the master, the device ini-
tiates the internally timed write cycle. ACK polling can
be initiated immediately. This involves the master send-
ing 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.
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.
7.1
Current Address Read
The 24LC04B/08B contains an address counter that
maintains the address of the last word accessed, inter-
nally 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 24LC04B/
08B issues an acknowledge and transmits the 8-bit
data word. The master will not acknowledge the trans-
fer but does generate a stop condition and the
24LC04B/08B discontinues transmission (Figure 7-1).
FIGURE 5-1: ACKNOWLEDGE POLLING
FLOW
Send
Write Command
7.2
Random Read
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
24LC04B/08B as part of a write operation. After the
word address is sent, the master generates a start con-
dition 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 24LC04B/
08B 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
24LC04B/08B discontinues transmission (Figure 7-2).
Send Stop
Condition to
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
7.3
Sequential Read
Did Device
NO
Sequential reads are initiated in the same way as a ran-
dom read except that after the 24LC04B/08B transmits
the first data byte, the master issues an acknowledge
as opposed to a stop condition in a random read. This
directs the 24LC04B/08B to transmit the next sequen-
tially addressed 8-bit word (Figure 7-3).
Acknowledge
(ACK = 0)?
YES
Next
Operation
To provide sequential reads the 24LC04B/08B 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.
6.0
WRITE PROTECTION
The 24LC04B/08B 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.
7.4
Noise Protection
The 24LC04B/08B 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.
DS21051E-page 6
1996 Microchip Technology Inc.
24LC04B/08B
FIGURE 7-1: CURRENT ADDRESS READ
S
T
S
T
A
R
T
BUS ACTIVITY
MASTER
CONTROL
BYTE
O
DATA n
P
SDA LINE
S
P
A
C
K
N
O
BUS ACTIVITY
A
C
K
FIGURE 7-2: RANDOM READ
S
T
O
P
S
T
A
R
T
S
T
A
R
T
BUS ACTIVITY
MASTER
CONTROL
BYTE
WORD
ADDRESS (n)
CONTROL
BYTE
DATA (n)
S
P
S
SDA LINE
A
C
K
A
C
K
A
C
K
N
O
BUS ACTIVITY
A
C
K
FIGURE 7-3: SEQUENTIAL READ
S
T
O
P
BUS ACTIVITY
MASTER
CONTROL
BYTE
DATA n
DATA n + 1
DATA n + 2
DATA n + X
SDA LINE
P
A
C
K
A
C
K
A
C
K
A
C
K
N
O
BUS ACTIVITY
A
C
K
8.3
WP
8.0
PIN DESCRIPTIONS
This pin must be connected to either VSS or VCC.
8.1
SDA Serial Address/Data Input/Output
If tied to VSS, normal memory operation is enabled
(read/write the entire memory).
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 pullup
resistor to VCC (typical 10KΩ for 100 kHz, 1KΩ for 400
kHz).
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 24LC04B/08B as
a serial ROM when WP is enabled (tied to VCC).
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 condi-
tions.
8.4
A0, A1, A2
These pins are not used by the 24LC04B/08B. They
may be left floating or tied to either VSS or VCC.
8.2
SCL Serial Clock
This input is used to synchronize the data transfer from
and to the device.
1996 Microchip Technology Inc.
DS21051E-page 7
24LC04B/08B
NOTES:
DS21051E-page 8
1996 Microchip Technology Inc.
24LC04B/08B
NOTES:
1996 Microchip Technology Inc.
DS21051E-page 9
24LC04B/08B
NOTES:
DS21051E-page 10
1996 Microchip Technology Inc.
24LC04B/08B
24LC04B/08B 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.
24LC04B/08B
–
/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
SM = Plastic SOIC (207 mil Body), 8-lead
Temperature
Range:
Blank = 0°C to +70°C
I = -40°C to +85°C
2
Device:
24LC04B
4K I C Serial EEPROM
2
24LC04BT
24LC08B
24LC04BT
4K1 C Serial EEPROM (Tape and Reel)
2
8K1 C Serial EEPROM
2
8K 1 C Serial EEPROM (Tape and Reel)
1996 Microchip Technology Inc.
DS21051E-page 11
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Los Angeles
Microchip Technology Inc.
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 714 263-1888 Fax: 714 263-1338
NewYork
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
All rights reserved. 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 repre-
sentation 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 autho-
rized 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.
DS21051E-page 12
1996 Microchip Technology Inc.
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