FM34W02 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM
with Full Array Write Protect
Connection Diagram
SO (M8) and TSSOP (MT8) Package
A0
A1
A2
VSS
1
2
3
4
8
VCC
WP
SCL
SDA
DS800041-2
FM34W02
7
6
5
Top View
See Package Number
M08A and MTC08
Pin Names
A0,A1,A2
V
SS
SDA
SCL
WP
V
CC
Device Address Inputs
Ground
Data I/O
Clock Input
Write Protect
Power Supply
Ordering Information
FM
34
W
02
LZ
E
XX
Package
Temp. Range
Voltage Operating Range
Letter
M8
MT8
None
E
Blank
L
LZ
02
W
Interface
34
FM
Description
8-Pin SO8
8-Pin TSSOP
0 to 70°C
-40 to +85°C
4.5V to 5.5V
2.7V to 5.5V
2.7V to 5.5V and
<1µA Standby Current
2K
Full Array Write Protect
IIC
Fairchild Non-Volatile
Memory
Density
2
FM34W02 Rev. A
www.fairchildsemi.com
FM34W02 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM
with Full Array Write Protect
Product Specifications
Absolute Maximum Ratings
Ambient Storage Temperature
All Input or Output Voltages
with Respect to Ground
Lead Temperature
(Soldering, 10 seconds)
ESD Rating
–65°C to +150°C
6.5V to –0.3V
+300°C
2000V min.
Operating Conditions
Ambient Operating Temperature
FM34W02
FM34W02E
Positive Power Supply
FM34W02
FM34W02L
FM34W02LZ
0°C to +70°C
-40°C to +85°C
4.5V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
Standard V
CC
(4.5V to 5.5V) DC Electrical Characteristics
Symbol
Parameter
Test Conditions
Min
I
CCA
I
SB
I
LI
I
LO
V
IL
V
IH
V
OL
Active Power Supply Current
Standby Current
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage
I
OL
= 3 mA
f
SCL
= 400 kHz
V
IN
= GND or V
CC
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
–0.3
V
CC
x 0.7
Limits
Typ
(Note 1)
0.2
10
0.1
0.1
Units
Max
1.0
50
1
1
V
CC
x 0.3
V
CC
+ 0.5
0.4
mA
µA
µA
µA
V
V
V
Low V
CC
(2.7V to 5.5V) DC Electrical Characteristics
Symbol
Parameter
Test Conditions
Min
I
CCA
I
SB
Active Power Supply Current
Standby Current
f
SCL
= 400 kHz
V
IN
= GND or V
CC
= 4.5V - 5.5V
V
IN
= GND or V
CC
= 2.7V - 5.5V (L)
V
IN
= GND or V
CC
= 2.7V - 5.5V (LV)
V
IN
= GND to V
CC
V
OUT
= GND to V
CC
–0.3
V
CC
x 0.7
I
OL
= 3 mA
Limits
Typ
(Note 1)
0.2
10
1
0.1
0.1
0.1
Units
Max
1.0
50
10
1
1
1
V
CC
x 0.3
V
CC
+ 0.5
0.4
mA
µA
µA
µA
µA
µA
V
V
V
I
LI
I
LO
V
IL
V
IH
V
OL
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Capacitance
T
A
= +25°C, f = 100/400 KHz, V
CC
= 5V
(Note 2)
Symbol
C
I/O
C
IN
Test
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, A2, SCL)
Conditions
V
I/O
= 0V
V
IN
= 0V
Max
8
6
Units
pF
pF
Note 1:
Typical values are T
A
= 25°C and nominal supply voltage (5V).
Note 2:
This parameter is periodically sampled and not 100% tested.
3
FM34W02 Rev. A
www.fairchildsemi.com
FM34W02 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM
with Full Array Write Protect
AC Conditions of Test
Input Pulse Levels
Input Rise and Fall Times
Input & Output Timing Levels
Output Load
V
CC
x 0.1 to V
CC
x 0.9
10 ns
V
CC
x 0.5
1 TTL Gate and C
L
= 100 pF
Read and Write Cycle Limits (Standard and Low V
CC
Range 2.7V - 5.5V)
Symbol
f
SCL
T
I
Parameter
SCL Clock Frequency
Noise Suppression Time Constant at
SCL, SDA Inputs (Minimum V
IN
Pulse width)
SCL Low to SDA Data Out Valid
Time the Bus Must Be Free before
a New Transmission Can Start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time
(for a Repeated Start Condition)
Data in Hold Time
Data in Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Condition Setup Time
Data Out Hold Time
Write Cycle Time - FM34W02
- FM34W02L, FM34W02LZ
100 KHz
Min
Max
100
100
0.3
4.7
4.0
4.7
4.0
4.7
0
250
1
300
4.7
300
10
15
3.5
400 KHz
Min
Max
400
50
0.1
1.3
0.6
1.5
0.6
0.6
0
100
0.3
300
0.6
50
10
15
0.9
Units
KHz
ns
µs
µs
µs
µs
µs
µs
ns
ns
µs
ns
µs
ns
ms
t
AA
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R
t
F
t
SU:STO
t
DH
t
WR
(Note 3)
Note 3:
The write cycle time (t
WR
) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle. During the write cycle, the
FM34W02 bus interface circuits are disabled, SDA is allowed to remain high per the bus-level pull-up resistor, and the device does not respond to its slave address.
4
FM34W02 Rev. A
www.fairchildsemi.com
FM34W02 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM
with Full Array Write Protect
Bus Timing
tF
tHIGH
tLOW
SCL
tLOW
tR
SDA
SDA
OUT
Background Information (IIC Bus)
As mentioned, the IIC bus allows synchronous bidirectional com-
munication between Transmitter/Receiver using the SCL (clock)
and SDA (Data I/O) lines. All communication must be started with
a valid START condition, concluded with a STOP condition and
acknowledged by the Receiver with an ACKNOWLEDGE condi-
tion.
In addition, since the IIC bus is designed to support other devices
such as RAM, EPROMs, etc., a device type identifier string must
follow the START condition. For EEPROMs, this 4-bit string is
1010. Also refer the
Addressing the WP Register
section.
As shown below, although the EEPROMs on the IIC bus may be
configured in any manner required, the total memory addressed
can not exceed 16K (16,384 bits) on the Standard IIC. EEPROM
memory address programming is controlled by 2 methods:
• Hardware configuring the A0, A1, and A2 pins (Device
Address pins) with pull-up or pull-down to V
CC
or V
SS
.
All
unused pins must be grounded
(tied to V
SS
).
• Software addressing the required PAGE BLOCK within the
device memory array (as sent in the Slave Address string).
Addressing an EEPROM memory location involves sending a
command string with the following information:
[DEVICE TYPE]—[DEVICE ADDRESS]—[PAGE BLOCK
ADDRESS]—[BYTE ADDRESS]
;;
tSU:STA
tHD:STA
IN
tHD:DAT
tSU:DAT
tSU:STO
tBUF
tDH
tAA
DS800041-5
DEFINITIONS
BYTE
PAGE
8 bits of data
16 sequential addresses (one byte
each) that may be programmed
during a 'Page Write' programming
cycle
2,048 (2K) bits organized into 16
pages of addressable memory. (8
bits) x (16 bytes) x (16 pages) = 2,048
bits
Any IIC device CONTROLLING the
transfer of data (such as a micropro-
cessor)
Device being controlled (EEPROMs
are always considered Slaves)
Device currently SENDING data on
the bus (may be either a Master or
Slave).
Device currently receiving data on the
bus (Master or Slave)
PAGE BLOCK
MASTER
SLAVE
TRANSMITTER
RECEIVER
Example of 16K of Memory on 2-Wire Bus
VCC
VCC
SDA
SCL
VCC
VCC
VCC
VCC
34C02L
A0 A1 A2 VSS
24C02
A0 A1 A2 VSS
24C04
A0 A1 A2 VSS
24C08
A0 A1 A2 VSS
To VCC or VSS
To VCC or VSS
To VCC or VSS
To VCC or VSS
DS800041-6
Note:
The SDA pull-up resistor is required due to the open-drain/open collector output of IIC bus devices.
The SCL pull-up resistor is recommended because of the normal SCL line inactive 'high' state.
It is recommended that the total line capacitance be less than 400pF.
Specific timing and addressing considerations are described in greater detail in the following sections.
我编写了一个5*8的存储器，代码如下：library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
entity ram is
port(clk,wr,rd,en, ......
白光LED光衰原因之荧光粉性能的衰退 到目前，白光 LED、尤其是小功率白光 LED 的发光性能快速衰退已越来越为人们所认识。其实，盲目地夸大宣传，只能将 LED 行业引向歧途，不正视白光 LED 存在的问题，只能延缓白光 LED 应用的发展。只有正视问题、研究问题、尽早解决问题，白光 LED 才能健康、快速发展。 白光 LED 当前面临的一个主要问题就寿命问题。由于白光 LED 的价格尚很...[详细]
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