24C08B/16B
8K/16K 5.0V I
2
C
™
Serial EEPROMs
FEATURES
• Single supply with operation from 4.5-5.5V
• Low power CMOS technology
- 1 mA active current typical
- 10
µ
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, I
2
C
™
compatible
• Schmitt trigger, filtered inputs for noise suppres-
sion
• 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):
-40˚C to +125˚C
PACKAGE TYPES
PDIP
A0
A1
A2
V
SS
1
24C08B/16B
2
3
4
8
7
6
5
V
CC
WP
SCL
SDA
8-lead
SOIC
A0
A1
A2
V
SS
1
24C08B/16B
8
7
6
5
V
CC
WP
SCL
SDA
2
3
4
14-lead
SOIC
NC
A0
A1
NC
A2
V
SS
NC
1
2
3
4
5
6
7
14
13
NC
V
CC
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 mem-
ory 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 pack-
ages.
BLOCK DIAGRAM
WP
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
EEPROM
ARRAY
PAGE LATCHES
SDA
SCL
YDEC
V
CC
V
SS
SENSE AMP
R/W CONTROL
I
2
C is a trademark of Philips Corporation.
©
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
V
SS
SDA
SCL
WP
V
CC
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
V
CC
...................................................................................7.0V
All inputs and outputs w.r.t. V
SS
............... -0.6V to V
CC
+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
*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
V
CC
= +4.5V to +5.5V
Automotive (E): Tamb = -40˚C to +125˚C
Parameter
Symbol
V
IH
V
IL
V
HYS
V
OL
I
LI
I
LO
C
IN
, C
OUT
I
CC
write
I
CC
read
I
CCS
Min
.7 Vcc
—
.05 Vcc
—
-10
-10
—
—
—
—
Max
—
.3 V
CC
—
.40
10
10
10
3
1
100
Units
V
V
V
V
µ
A
µ
A
pF
mA
mA
µ
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)
I
OL
= 3.0 mA, V
CC
=4.5V
V
IN
=.1V to V
CC
V
OUT
= .1V to V
CC
V
CC
= 5.0V (Note 1)
Tamb = 25˚C, F
CLK
=1 MHz
V
CC
= 5.5V, SCL = 400 kHz
V
CC
= 5.5V, SDA = SCL = V
CC
This parameter is periodically sampled and not 100% tested.
FIGURE 1-1:
BUS TIMING START/STOP
V
HYS
SCL
T
SU
:
STA
SDA
T
HD
:
STA
T
SU
:
STO
START
STOP
DS21081D-page 2
©
1996 Microchip Technology Inc.
24C08B/16B
TABLE 1-3:
AC CHARACTERISTICS
Symbol
F
CLK
T
HIGH
T
LOW
T
R
T
F
T
HD
:
STA
T
SU
:
STA
T
HD
:
DAT
T
SU
:
DAT
T
SU
:
STO
T
AA
T
BUF
T
OF
T
SP
T
WR
—
—
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 V
IH
min to V
IL
max
Input filter spike suppres-
sion (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), C
B
≤
100 pF
(Note 3)
Byte or Page mode
25
°
C, V
CC
= 5.0V, Block Mode
(Note 4)
Note 1: Not 100% tested. C
B
= 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 T
SP
and V
HYS
specifications are due to new Schmitt trigger inputs which provide improved
noise and spike suppression. This eliminates the need for a T
I
specification.
4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific appli-
cation, please consult the Total Endurance Model which can be obtained on our BBS or website.
FIGURE 1-2:
BUS TIMING DATA
T
F
T
HIGH
T
LOW
T
R
SCL
T
SU
:
STA
SDA
IN
T
HD
:
STA
T
SP
T
AA
T
BUF
T
HD
:
DAT
T
SU
:
DAT
T
SU
:
STO
T
AA
SDA
OUT
T
HD
:
STA
©
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 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.
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 program-
ming 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
©
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 dur-
ing 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 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).
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
©
1996 Microchip Technology Inc.
DS21081D-page 5
京公网安备 11010802033920号
EEWORLD
