Holtek HT2201 Cmos 1k 2-wire serial eeprom Datasheet

HT2201
CMOS 1K 2-Wire Serial EEPROM
Features
Block Diagram
• Operating voltage:
1.8V~5.5V for temperature -40°C to +85°C
• Low power consumption
–– Operation: 5mA max.
–– Standby: 2μA max.
 • Internal organization: 128×8
• 2-wire serial interface
• Write cycle time: 5ms max.

• Automatic erase-before-write operation
• Write operation with built-in timer
• 40-year data retention
• 106 erase/write cycles per word
• SOT23-5 package
General Description


 Pin Assignment
The HT2201 is a 1K-bit serial read/write non-volatile
memory device using the CMOS floating gate process.
Its 1024 bits of memory are organized into 128 words
and each word is 8 bits. The device is optimized for
use in many industrial and commercial applications
where low power and low voltage operation are
essential. The HT2201 is guaranteed for 1 million
erase/write cycles and 40-year data retention.
Selection Table
Part No.
Capacity
VDD
HT2201
128×8
1.8V~5.5V
Clock Rate Write Speed
(kHz)
@2.4V(ms)
400
5
Operating
Current
@5.0V(mA)
5
Standby
Current
Package
@5.0V(μA)
2
SOT23-5
Marking
2201+
Pin Description
Pin Name
I/O
Description
I/O
Serial data input/output
SCL
I
Serial clock data input
VSS
—
Negative power supply, ground
VCC
—
Positive power supply
SDA
Rev. 1.40
1
January 16, 2014
HT2201
Absolute Maximum Ratings
Supply Voltage .......................... VSS−0.3V to VSS+6.0V
Storage Temperature............................−50°C to 125°C
Input Voltage............................. VSS−0.3V to VCC+0.3V
Operating Temperature..........................−40°C to 85°C
Note: These are stress ratings only. Stresses exceeding the range specified under ″Absolute Maximum Ratings″
may cause substantial damage to the device. Functional operation of this device at other conditions beyond
those listed in the specification is not implied and prolonged exposure to extreme conditions may affect
device reliability.
D.C. Characteristics
Symbol
Parameter
Ta=-40°C~+85°C
Test Conditions
VCC
Conditions
Min.
Typ.
Max.
Unit
VCC
Operating Voltage
—
-40°C~+85°C
1.8
—
5.5
V
ICC1
Operating Current
5V
Read at 400kHz
—
—
2
mA
ICC2
Operating Current
5V
Write at 400kHz
—
—
5
mA
VIL
Input Low Voltage
—
—
-0.45
—
0.3VCC
V
VIH
Input High Voltage
—
—
0.7VCC
—
VCC+0.5
V
VOL
Output Low Voltage
2.4V IOL=2.1mA
—
—
0.4
V
1.8V IOL=0.7mA
—
—
0.2
V
ILI
Input Leakage Current
5V
VIN=0 or VCC
—
—
1
μA
ILO
Output Leakage Current
5V
VOUT=0 or VCC
—
—
1
μA
5V
VIN=0 or VCC
—
—
2
μA
1.8V VIN=0 or VCC
—
—
2
μA
ISTB
Standby Current
CIN
Input Capacitance (See Note)
—
f=1MHz, 25°C
—
—
6
pF
COUT
Output Capacitance (See Note)
—
f=1MHz, 25°C
—
—
8
pF
Note: These parameters are periodically sampled but not 100% tested.
Rev. 1.40
2
January 16, 2014
HT2201
A.C. Characteristics
Symbol
Ta=-40°C~+85°C
Parameter
Remark
VCC=1.8V~5.0V VCC=2.5V~5.0V
Min.
Max.
Min.
Max.
Unit
fSK
Clock Frequency
—
—
400
—
1000
kHz
tHIGH
Clock High Time
—
600
—
400
—
ns
tLOW
Clock Low Time
—
1200
—
600
—
ns
tr
SDA and SCL Rise Time
Note
—
300
—
300
ns
tf
SDA and SCL Fall Time
Note
—
300
—
300
ns
tHD:STA
START Condition Hold
Time
After this period the first clock pulse
is generated
600
—
250
—
ns
tSU:STA
START Condition Setup
Time
Only relevant for repeated START
condition
600
—
250
—
ns
tHD:DAT
Data Input Hold Time
—
0
—
0
—
ns
tSU:DAT
Data Input Setup Time
—
150
—
100
—
ns
tSU:STO
STOP Condition Setup
Time
—
600
—
250
—
ns
tAA
Output Valid from Clock
—
—
900
—
600
ns
tBUF
Bus Free Time
Time in which the bus must be free
before a new transmission can start
1200
—
500
—
ns
tSP
Input Filter Time Constant
Noise suppression time
(SDA and SCL Pins)
—
50
—
50
ns
tWR
Write Cycle Time
—
5
—
5
Endurance 25°C, Page Mode
—
5.0V
1,000,000
ms
Write
Cycles
Note: These parameters are periodically sampled but not 100% tested.
For relative timing, refer to timing diagrams.
Rev. 1.40
3
January 16, 2014
HT2201
Functional Description
Pin Function
Device Addressing
• Serial clock – SCL
The SCL input is used for positive edge clock
data into each EEPROM device and negative edge
clock data out of each device.
The HT2201 requires an 8-bit device address word
following a start condition to enable the chip for a
read or write operation. The device address word
consist of a mandatory one, zero sequence for the
first four most significant bits (refer to the diagram
showing the Device Address). This is common to all
the EEPROM device. The next three bits are fixed to
zeros.
• Serial data – SDA
The SDA pin is bidirectional for serial data
transfer. The pin is open-drain driven and may be
wired-OR with any number of other open-drain or
open collector devices.
The 8th bit of 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.
Memory Organization
• HT2201, 1K Serial EEPROM
Internally organized with 128×8-bit words, the
HT2201 requires an 8-bit data word address for
random word addressing.
• 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 zero
and then clock in the first 8-bit data word. After
receiving the 8-bit data word, the EEPROM will
output a zero 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 to the nonvolatile memory. All inputs are disabled during this
write cycle and EEPROM will not respond until
the write is completed (refer to Byte write timing).
• Start condition
A high-to-low transition of SDA with SCL high
is a start condition which must precede any other
command (refer to Start and Stop Definition
Timing diagram).
• 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 (refer to Start and Stop Definition
Timing Diagram).
• Acknowledge polling
To maximise bus throughput, one technique is to
allow the master to poll for an acknowledge signal
after the start condition and the control byte for
a write command have been sent. If the device is
still busy implementing its write cycle, then no
ACK will be returned. The master can send the
next read/write command when the ACK signal
has finally been received.
• Acknowledge
All addresses and data words are serially
transmitted to and from the EEPROM in 8-bit
words. The EEPROM sends a zero to acknowledge
that it has received each word. This happens during
the ninth clock cycle.
• Read operations
The HT2201 supports three read operations,
namely, current address read, random address
read and sequential read. During read operation
execution, the read/write select bit should be set to
"1".
Rev. 1.40
Write Operations
• Clock and data transition
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 data line while the clock line is high
will be interpreted as a START or STOP condition.
Device Operations
4
January 16, 2014
HT2201
• Random read
Arandom read requires a dummy byte write
sequence to load in the data word address which
is then clocked in and acknowledged by the
EEPROM. The microcontroller must then 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 should respond with a "no ACK"
signal (high) followed by a stop condition. (refer
to Random read timing).
• 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 acknowledgment. As long as the EEPROM
receives an acknowledgment, 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 continues. The
sequential read operation is terminated when the
microcontroller responds with a "no ACK" signal
(high) followed by a stop condition.
 
  Acknowledge Polling Flow
• 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 from the last byte of the last memory page to
the first byte of the first page. The address roll over
during write from the last byte of the current page
to the first byte of the same page. Once the device
address with the read/write select bit set to one is
clocked in and acknowledged by the EEPROM,
the current address data word is serially clocked
out. The microcontroller should respond a No
ACK (High) signal and following stop condition
(refer to Current read timing).
Rev. 1.40
5
January 16, 2014
HT2201
Byte Write Timing
Current Read Timing
Random Read Timing
Sequential Read Timing
Timing Diagrams
Note: The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the valid
start condition of sequential command.
Rev. 1.40
6
January 16, 2014
HT2201
Package Information
Note that the package information provided here is for consultation purposes only. As this information may be
updated at regular intervals users are reminded to consult the Holtek website for the latest version of the package
information.
Additional supplementary information with regard to packaging is listed below. Click on the relevant section to be
transferred to the relevant website page.
• Further Package Information (include Outline Dimensions, Product Tape and Reel Specifications)
• Packing Meterials Information
• Carton information
Rev. 1.40
7
January 16, 2014
HT2201
5-pin TSOT23-5 Outline Dimensions
Symbol
Min.
Nom.
Max.
A
0.030
—
0.031
A1
0.000
—
0.002
A2
0.028
0.030
0.031
b
0.014
—
0.020
C
0.004
—
0.008
D
—
0.114 BSC
—
E
—
0.110 BSC
—
E1
—
0.063 BSC
—
e
—
0.037 BSC
—
e1
—
0.075 BSC
—
L
0.015
0.018
0.024
L1
—
0.024 BSC
—
θ
0°
—
8°
Symbol
Rev. 1.40
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
0.75
—
0.80
A1
0.00
—
0.05
A2
0.70
0.75
0.78
b
0.35
—
0.50
C
0.10
—
0.20
D
—
2.90 BSC
—
E
—
2.80 BSC
—
E1
—
1.60 BSC
—
e
—
0.95 BSC
—
e1
—
1.90 BSC
—
L
0.37
0.45
0.60
L1
—
0.60 BSC
—
θ
0°
—
8°
8
January 16, 2014
HT2201
Copyright© 2014 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time
of publication. However, Holtek assumes no responsibility arising from the use of
the specifications described. The applications mentioned herein are used solely
for the purpose of illustration and Holtek makes no warranty or representation that
such applications will be suitable without further modification, nor recommends
the use of its products for application that may present a risk to human life due to
malfunction or otherwise. Holtek's products are not authorized for use as critical
components in life support devices or systems. Holtek reserves the right to alter
its products without prior notification. For the most up-to-date information, please
visit our web site at http://www.holtek.com.tw.
Rev. 1.40
9
January 16, 2014
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