HG24LC128/256
Features
Wide voltage Operation
VCC = 1.8V to 5.5V
Low-Power Devices (ISB = 3 µA @ 5.5V)
1MHZ(5V),400kHz(1.8V,2.7V,3.3V)
Compatibility
Write Protect Pin for Hardware Data Protection
Available Operating Ambient Temperature:
64-byte Page (128K/256K) Write Modes Partial
-40°C to +85°C Internally Organized 16,384 X 8
Page Writes Allowed
(128K), 32,768 X 8 (256K) Two-wire Serial
Self-timed Write Cycle(5ms max) High-reliability
Interface
Endurance: 1 Million Write Cycles
Schmitt Trigger, Filtered Inputs for Noise
Data Retention: 100 Years
Suppression Bidirectional Data Transfer
8-lead PDIP, 8-lead JEDEC SOIC and 8-lead
Protocol
MSOP Packages
ORDERINGINFORMATION
DEVICE
Package Type
MARKING
Packing
Packing Qty
HG24LC128N
DIP8
24LC128
TUBE
2000/box
HG24LC256N
DIP8
24LC256
TUBE
2000/box
HG24LC128M/TR
SOP8
24LC128
REEL
2500/reel
HG24LC256M/TR
SOP8
24LC256
REEL
2500/reel
HG24LC128MM/TR
MSOP8
24LC128
REEL
3000/reel
HG24LC256MM/TR
MSOP8
24LC256
REEL
3000/reel
General Description
The HG24LC128 / 256 provides 131,072/262,144 bits of serial electrically erasable and programmable
read-only memory (EEPROM) organized as4096 words of 8 bits each The device is optimized for use in many
industrial and commercial applications where low-power and low-voltage operation are essential. The
HG24LC128 / 256 is available in space-saving 8-lead DIP, 8-lead SOP8 and 8-lead MSOP packages and is
accessed via a Two-wire serial interface.
Pin Configuration
DIP8/SOP8/MSOP8
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HG24LC128/256
Pin Descriptions
Pin
Number
Designation
Type
Name and Functions
Address Inputs
DEVICE/PAGE ADDRESSES (A1, A0):
The A1 and A0 pins are device address inputs that are hardwired or left
not connected for hardware compatibility with other 24LCxx devices.
1–2
A0 – A1
I
When the pins are hardwired, as many as four 128K/256K devices may
be addressed on a single bus system (device addressing is discussed in
detail under the Device Addressing section). If the pins are left floating,
the A2, A1 and A0 pins will be internally pulleddown to GND if the
capacitive coupling to the circuit board VCC plane is 3 pF, recommends connecting the address pins to GND.
Serial Data
5
SDA
I/O&
Open-drain
SERIAL DATA (SDA):The SDA pin is bi-directional for serial data
transfer. Thispin is open-drain driven and may be
wire-ORed with any number of other open-drain or open- collector
devices.
Serial Clock Input
6
SCL
I
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock
data into eachEEPROM device and negative edge clock data out of
each device.
Write Protect
WRITE PROTECT (WP):The write protect input, when connected to
GND, allows normal write operations. When WP is connected high to
VCC, all write operations to the memory are inhibited. If the pin is left
7
WP
I
floating, the WP pin will be internally pulled down to GND if the
capacitive coupling to the circuit board VCCplane is 3 pF, recommends connecting the pin to GND. Switching WP to
VCC prior to a write operation creates a software write protect function.
The write protection feature is enabled and operates as shown in the
following Table 1.
4
8
3
GND
VCC
NC
P
P
NC
Ground
Power Supply
No connect
Table 1:Write Protect
WP Pin Status:
At VCC
At GND
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Part of the Array Protected
HG24LC128
HG24LC256
Full (128K) Array
Full (256K) Array
Normal Read/Write Operations
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HG24LC128/256
Block Diagram
Functional Description
1.
Memory Organization
HG24LC128, 128K SERIAL EEPROM: The 128K is internally organized as 256 pages of 64 bytes each.
Random word addressing requires a 14 bi-t data word address.
HG24LC256, 256K SERIAL EEPROM: The 256K is internally organized as 512 pages of
64 bytes each. Random word addressing requires a 15-bit data word address.
2.
Device Operation
CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device.
Data on the SDA pin may change only during SCL low time periods (see to Figure 1 on page 5). Data
changes during SCL high periods will indicate a start or stop condition as defined below.
START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must
precede any other command (see to Figure 2 on page 5).
STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence,
the stop command will place the EEPROM in a standby power mode (see Figure 2 onpage 5).
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ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit
words. The EEPROM sends a “0” to acknowledge that it has received each word. This happens during the
ninth clock cycle.
STANDBY MODE: The HG24LC128 / 256 features a low-power standby mode which is enabled: (a) upon
power-up and (b) after the receipt of the STOP bit and the completion of any internal operations
MEMORY RESET: After an interruption in protocol, power loss or system reset, any two-wire part can be reset
by following these steps:
1. Clock up to 9 cycles.
2. Look for SDA high in each cycle while SCL is high.
3. Create a start condition.
Figure 1.Data Validity
Figure 2.Start and Stop Definition
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Figure 3. Output Acknowledge
3. Device Addressing
The 128K/256K EEPROM devices all require an 8-bit device address word following a start condition to
enable the chip for a read or write operation (see to Figure 4 on page 5).
The device address word consists of a mandatory “1”, “0” sequence for the first four most
significant bits as shown. This is common to all the Serial EEPROM devices.
The 128K/256K uses the three device address bits A2, A1, A0 to allow as many as eight devices on the same
bus. These bits must compare to their corresponding hardwired input pins. The A2, A1, and A0 pins use an
internal proprietary circuit that biases them to a logic low condition if the pins are allowed to float.
The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if this bit
is high and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a “0”. If a compare is not made, the
chip will return to a standby state.
NOISE PROTECTION: Special internal circuitry placed on the SDA and SCL pins prevent small noise spikes
from activating the device.
DATA SECURITY: The HG24LC128 / 256 has a hardware data protection scheme that allows the user to write
protect the entire memory when the WP pin is at VCC.
Write Operations
BYTE WRITE: A write operation requires an 8-bit data word address following the device address word and
acknowledgment. Upon receipt of this address, the EEPROM will again respond with a “0” and then clock in the
first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a “0” and the addressing
device, such as a microcontroller, must terminate the write sequence with a stop condition. At this time the
EEPROM enters an internally timed write cycle, tWR,
to the nonvolatile memory. All inputs are disabled during this write cycle and the EEPROM will not
respond until the write is complete (see Figure 5 on page 8).
PAGE WRITE: The 128K/256K devices are capable of 64-byte page writes.
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HG24LC128/256
A page write is initiated the same as a byte write, but the microcontroller does not send a stopcondition after
the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the
microcontroller can transmit up to 63 more data words. The EEPROM will respond with a “0” after each data
word received. The microcontroller must terminate the page write sequence with a stop condition (see Figure
6 on page 8).
The data word address lower six (128K/256K) bits are internally incremented following the receipt of each
data word. The higher data word address bits are not incremented, retaining the memory page row location.
When the word address, internally generated, reaches the page boundary, the following byte is placed at the
beginning of the same page. If more than 64 data words are transmitted to the EEPROM, the data word
address will “roll over” and previous data will be overwritten.
ACKNOWLEDGE POLLING: Once the internally timed write cycle has started and the EEPROM inputs are
disabled, acknowledge polling can be initiated. This involves sending a start condition followed by the device
address word. The read/write bit is representative of the operation desired. Only if the internal write cycle has
completed will the EEPROM respond with a “0”, allowing the read or write sequence to continue.
Read Operations
Read operations are initiated the same way as write operations with the exception that the read/write select bit
in the device address word is set to “1”. There are three read operations: current address read, random
address read and sequential read.
CURRENT ADDRESS READ: The internal data word address counter maintains the last address accessed
during the last read or write operation, incremented by one. This address stays valid between operations as
long as the chip power is maintained. The address “roll over” during read is from the last byte of the last
memory page to the first byte of the first page. The address “roll over” during write is from the last byte of the
cur- rent page to the first byte of the same page.
Once the device address with the read/write select bit set to “1” is clocked in and acknowledged by the
EEPROM, the current address data word is serially clocked out. The microcontroller does not respond with an
input “0” but does generate a following stop condition (see Figure 7 on page 8).
RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data word address.
Once the device address word and data word address are clocked in and acknowledged by the EEPROM, the
microcontroller must generate another start condition. The microcontroller now initiates a current address read
by sending a device address with the read/write select bit high. The EEPROM acknowledges the device
address and serially clocks out the data word. The microcontroller does not respond with a “0” but does
generate a following stop condition (see Figure 8 on page 8).
SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a random address
read. After the microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM
receives an acknowledge, it will continue to increment the data word address
and serially clock out sequential data words. When the memory address limit is reached, the data
word address will “roll over” and the sequential read will continue. The sequential read operation
is terminated when the microcontroller does not respond with a “0” but does generate a following stop condition
(see Figure 9 on page 9)
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HG24LC128/256
Figure 4.Device Address
Figure 5.Byte Write
Figure 6.Page Write
Figure 7.Current Address Read
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HG24LC128/256
Figure 8.Random Read
Figure 9.Sequential Read
Electrical Characteristics
Absolute Maximum Stress Ratings
Symbol
Parameter
VCC
Supply Voltage
VO
Input / Output Voltage
Value
Unit
+6.5
V
GND-0.3 to VCC+0.3
V
Tamb
Operating Ambient Temperature
-40to+85
°C
Tstg
Storage Temperature
-55to125
°C
*Comments
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to this
device. These are stress ratings only. Functional operation of this device at these or any other conditions
above those indicated in the operational sections of this specification is not implied or intended. Exposure to
the absolute maximum rating conditions for extended periods may affect device reliability.
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HG24LC128/256
DC Electrical Characteristics
Applicable over recommended operating range from: TA = –40°C to +85°C, VCC =+1.8V to +5.5V
(unless otherwise noted)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Supply Voltage
VCC1
1.8
-
5.5
V
Supply Voltage
VCC2
2.5
-
5.5
V
Supply Voltage
VCC3
2.7
-
5.5
V
Supply Voltage
VCC4
4.5
-
5.5
V
Supply Current VCC=5.0V
ICC1
-
0.4
1.0
mA
READ at 400 kHz
Supply Current VCC=5.0V
ICC2
-
2.0
3.0
mA
WRITE at 400 kHz
Supply Current VCC=1.8V
ISB1
-0.6
1.0
VIN=VCC or VSS
Supply Current VCC=2.5V
ISB2
-1.0
2.0
VIN=VCC or VSS
Supply Current VCC=2.7V
ISB3
-1.0
2.0
VIN=VCC or VSS
Supply Current VCC=5.0V
ISB4
-1.0
3.0
VIN=VCC or VSS
Input Leakage Current
ILI
-
0.10
3.0
VIN=VCC or VSS
Output Leakage Current
ILO
-
0.05
3.0
VIN=VCC or VSS
Input Low Level
VIL
-0.6
-
VCC×0.3
V
Input High Level
VIH
VCC×0.7
-
VCC+0.5
V
Output Low Level VCC=5.0V
VOL3
-
-
0.4V
Output Low Level VCC=3.0V
VOL2
-
-
0.4
V
Output Low Level VCC=1.8V
VOL1
-
-
0.2
V
Pin Capacitance
Applicable over recommended operating range from TA=25°C,f=1.0MHz,VCC=+1.8V
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Input/Output Capacitance(SDA)
CI/O
-
-
8pF
VI/O=0V
Input Capacitance(A0,A1,A2,SCL)
CIN
-
-
8pF
VIN=0V
AE Electrical Characteristics
Applicable over recommended operating range from: TA = –40°C to +85°C, VCC =+1.8V to +5.5V,CL=1TTL
Gate and 100pF(unless otherwise noted)
Parameter Symbol
Min.
1.8, 2.7, 5.0-volt
Typ.
Max.
Units
Clock Frequency, SCL
fSCL
-
-
400
kHz
Clock Pulse Width Low
tLOW
1.2
-
-
µs
Clock Pulse Width High
tHIGH
0.6
-
-
µs
Noise Suppression Time
tI
-
-
50
ns
tAA
0.1
-
0.9
µs
Clock Low to Data Out Valid
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HG24LC128/256
Time the bus must be free
before a new transmission canstart
tBUF
1.2
-
-
µs
Start Hold Time
tHD.STA
0.6
-
-
µs
Start Setup Time
tSU.STA
0.6
-
-
µs
Data In Hold Time
tHD.DAT
0
-
-
µs
Data In Setup Time
tSU.DAT
100
-
-
ns
Inputs Rise Time
tR
-
-
0.3
µs
Inputs Fall Time
tF
-
-
300
ns
Stop Setup Time
tSU.STO
0.6
-
-
µs
50 -
-
ns
Data Out Hold Time
tDH
Write Cycle Time
tWR
-
-
5
ms
Endurance
1M
-
-
Write Cycles
5.0V, 25
C, Byte Mode
Bus Timing
Figure 10.SCL: Serial Clock, SDA: Serial Data I/O
Write Cycle Timing
Figure 11.SCL: Serial Clock, SDA: Serial Data I/O
Note:
1. The write cycle time tWR is the time from a valid stop condition of a write sequence to
the end of the internal clear/write cycle.
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HG24LC128/256
Physical Dimensions
SOP-8L
Q
A
C
C1
B
D
A1
a
0.25
b
Dimensions In Millimeters(SOP8L)
A
A1
B
C
C1
D
Min:
1.35
0.05
4.90
5.80
3.80
0.40
0°
0.35
Max:
1.55
0.20
5.10
6.20
4.00
0.80
8°
0.45
Symbol:
Q
a
b
1.27 BSC
DIP-8L
D1
L1
L
E
B
d
D
A
c
a
b
Dimensions In Millimeters(DIP8L)
A
B
D
D1
E
L
L1
a
b
c
Min:
6.10
9.00
8.40
7.42
3.10
0.50
3.00
1.50
0.85
0.40
Max:
6.68
9.50
9.00
7.82
3.55
0.70
3.60
1.55
0.90
0.50
Symbol:
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d
2.54 BSC
2022 JULY
HG24LC128/256
Physical Dimensions
MSOP8
Q
A
C1
C
B
A1
D
0.20
b
a
Dimensions In Millimeters(MSOP8L)
A
A1
B
C
C1
D
Min:
0.80
0.05
2.90
4.75
2.90
0.35
0°
0.25
Max:
0.90
0.20
3.10
5.05
3.10
0.75
8°
0.35
Symbol:
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Q
a
b
0.65 BSC
2022 JULY
HG24LC128/256
IMPORTANT STATEMENT:
Huaguan Semiconductor Co,Ltd. reserves the right to change the products and
services provided without notice. Customers should obtain the latest relevant
information before ordering, and verify the timeliness and accuracy of this
information.
Customers are responsible for complying with safety standards and taking safety
measures when using our products for system design and machine manufacturing to
avoid potential risks that may result in personal injury or property damage.
Our products are not licensed for applications in life support, military, aerospace,
etc., so we do not bear the onsequences of the application of these products in these
fields.
Huaguan Semiconductor Co,Ltd. the performance of the semiconductor products
produced by the company can reach the performance indicators that can be applied
at the time of sales. The use of testing and other quality control technologies is limite
d to the quality assurance scope of Huaguan semiconductor. Not all parameters of
each device need to be tested. The above documents are for reference only, and all
are subject to the physical parameters.
Our documentation is only permitted to be copied without any tampering with the
content, so we do not accept any responsibility or liability for the altered documents.
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