March 1999
NM34C02
2K-Bit Standard 2-Wire Bus Interface
Designed with Permanent Write-Protection for First 128 Bytes for Serial Presence Detect Application on Memory Modules
General Description
The NM34C02 is 2048 bits of CMOS non-volatile electrically erasable memory. It is designed to support Serial Presence Detect circuitry in memory modules. This communications protocol uses CLOCK (SCL) and DATA I/O (SDA) lines to synchronously clock data between the master (for example a microprocessor) and the slave EEPROM device(s).
The contents of the non-volatile memory allows the CPU to determine the capacity of the module and the electrical characteristics of the memory devices it contains. This will enable "plug and play" capability as the module is read and PC main memory resources utilized through the memory controller.
The first 128 bytes of the memory of the NM34C02 can be permanently Write Protected by writing to the "WRITE PROTECT" Register. Write Protect implementation details are described under the section titled Addressing the WP Register.
The NM34C02 is available in a JEDEC standard TSSOP package for low profile memory modules for systems requiring efficient space utilization such as in a notebook computer. Two options are available: L - Low Voltage and LZ - Low Power, allowing the part to be used in systems where battery life is of primary importance.
Features
■Extended Operating Voltage: 2.7V-5.5V
■Write-Protection for first 128 bytes
■200 μA active current typical
–10 μA standby current typical
–1.0 μA standby current typical (L)
–0.1 μA standby current typical (LZ)
■IIC compatible interface
–Provides bidirectional data transfer protocol
■Sixteen byte page write mode
–Minimizes total write time per byte
■Self timed write cycle
- Typical write cycle time of 6ms
■Endurance: 1,000,000 data changes
■Data retention greater than 40 years
■Packages available: 8-pin TSSOP and 8-pin SO
Block Diagram
VCC |
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VSS |
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START CYCLE |
H.V. GENERATION |
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TIMING &CONTROL |
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SDA |
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START |
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STOP |
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LOGIC |
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CONTROL |
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LOGIC |
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SLAVE ADDRESS |
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16 |
E2PROM |
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REGISTER & |
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ARRAY |
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SCL |
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COMPARATOR |
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XDEC |
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16 x 16 x 8 |
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LOAD |
INC |
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A2 |
WORD |
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A1 |
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ADDRESS |
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A0 |
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0/1/2/3 |
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COUNTER |
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16 |
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4 |
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4 |
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R/W |
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YDEC |
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Device Address Bits |
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8 |
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Write Protect |
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CK |
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DOUT |
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Register |
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DATA REGISTER |
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DIN |
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DS012821-1
Interface Bus Wire-2 Standard Bit-2K NM34C02
© 1999 Fairchild Semiconductor Corporation |
1 |
www.fairchildsemi.com |
NM34C02 Rev. D.2
Connection Diagram
SO (M8) and TSSOP (MT8) Package
A0 |
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1 |
8 |
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VCC |
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A1 |
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2 |
7 |
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NC |
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NM34C02 |
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A2 |
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3 |
6 |
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SCL |
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VSS |
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4 |
5 |
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SDA |
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DS012821-2
Top View
See Package Number
M08A and MTC08
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Pin Names |
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A0,A1,A2 |
Device Address Inputs |
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VSS |
Ground |
SDA |
Data I/O |
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SCL |
Clock Input |
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NC |
No Connection |
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VCC |
Power Supply |
Ordering Information
NM34C02 XX X X
Package
M8 = 8 pin SOIC
MT8 = 8 pin TSSOP
Temperature Range
Blank = 0°C to +70°C
E = -40°C to +85°C
Voltage Range
Blank = 4.5V to 5.5V
L = 2.7V to 4.5V
LZ = 2.7V to 4.5V and < 1μA standby current
Device
2K IIC Serial EEPROM
DS012821-21
Interface Bus Wire-2 Standard Bit-2K NM34C02
2 |
www.fairchildsemi.com |
NM34C02 Rev. D.2
Product Specifications
Absolute Maximum Ratings
Ambient Storage Temperature |
–65°C to +150°C |
All Input or Output Voltages |
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with Respect to Ground |
6.5V to –0.3V |
Lead Temperature |
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(Soldering, 10 seconds) |
+300°C |
ESD Rating |
2000V min. |
Operating Conditions
Ambient Operating Temperature |
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NM34C02 |
0°C to +70°C |
NM34C02E |
-40°C to +85°C |
Positive Power Supply |
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NM34C02 |
4.5V to 5.5V |
NM34C02L |
2.7V to 4.5V |
NM34C02LZ |
2.7V to 4.5V |
Standard VCC (4.5V to 5.5V) DC Electrical Characteristics
Symbol |
Parameter |
Test Conditions |
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Limits |
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Units |
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Min |
Typ |
Max |
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(Note 1) |
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ICCA |
Active Power Supply Current |
fSCL = 100 kHz |
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0.2 |
1.0 |
mA |
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ISB |
Standby Current |
VIN = GND or VCC |
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10 |
50 |
μA |
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ILI |
Input Leakage Current |
VIN = GND to VCC |
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0.1 |
1 |
μA |
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ILO |
Output Leakage Current |
VOUT = GND to VCC |
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0.1 |
1 |
μA |
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VIL |
Input Low Voltage |
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–0.3 |
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VCC x 0.3 |
V |
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VIH |
Input High Voltage |
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VCC x 0.7 |
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VCC + 0.5 |
V |
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VOL |
Output Low Voltage |
IOL = 3 mA |
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0.4 |
V |
Low VCC (2.7V to 5.5V) DC Electrical Characteristics
Symbol |
Parameter |
Test Conditions |
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Limits |
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Units |
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Min |
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Typ |
Max |
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(Note 1) |
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ICCA |
Active Power Supply Current |
fSCL = 100 kHz |
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0.2 |
1.0 |
mA |
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ISB |
Standby Current for L |
VIN = GND or VCC |
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1 |
10 |
μA |
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Standby Current for LZ |
VIN = GND or VCC |
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0.1 |
1 |
μA |
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ILI |
Input Leakage Current |
VIN = GND to VCC |
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0.1 |
1 |
μA |
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ILO |
Output Leakage Current |
VOUT = GND to VCC |
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0.1 |
1 |
μA |
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VIL |
Input Low Voltage |
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–0.3 |
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VCC x 0.3 |
V |
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VIH |
Input High Voltage |
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VCC x 0.7 |
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VCC + 0.5 |
V |
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VOL |
Output Low Voltage |
IOL = 3 mA |
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0.4 |
V |
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Capacitance TA = +25°C, f = 100/400 KHz, VCC = 5V (Note 2) |
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Symbol |
Test |
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Conditions |
Max |
Units |
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CI/O |
Input/Output Capacitance (SDA) |
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VI/O = 0V |
8 |
pF |
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CIN |
Input Capacitance (A0, A1, A2, SCL) |
VIN = 0V |
6 |
pF |
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Note 1: Typical values are TA = 25°C and nominal supply voltage (5V).
Note 2: This parameter is periodically sampled and not 100% tested.
Interface Bus Wire-2 Standard Bit-2K NM34C02
3 |
www.fairchildsemi.com |
NM34C02 Rev. D.2
AC Conditions of Test
Input Pulse Levels |
VCC x 0.1 to VCC x 0.9 |
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Input Rise and Fall Times |
10 ns |
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Input & Output Timing Levels |
VCC x 0.5 |
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Output Load |
1 TTL Gate and CL = 100 pF |
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Read and Write Cycle Limits (Standard and Low VCC Range 2.7V - 4.5V)
Symbol |
Parameter |
100 KHz |
400 KHz |
Units |
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Min |
Max |
Min |
Max |
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fSCL |
SCL Clock Frequency |
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100 |
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400 |
KHz |
TI |
Noise Suppression Time Constant at |
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SCL, SDA Inputs (Minimum VIN |
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100 |
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50 |
ns |
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Pulse width) |
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tAA |
SCL Low to SDA Data Out Valid |
0.3 |
3.5 |
0.1 |
0.9 |
μs |
tBUF |
Time the Bus Must Be Free before |
4.7 |
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1.3 |
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μs |
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a New Transmission Can Start |
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tHD:STA |
Start Condition Hold Time |
4.0 |
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0.6 |
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μs |
tLOW |
Clock Low Period |
4.7 |
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1.5 |
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μs |
tHIGH |
Clock High Period |
4.0 |
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0.6 |
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μs |
tSU:STA |
Start Condition Setup Time |
4.7 |
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0.6 |
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μs |
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(for a Repeated Start Condition) |
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tHD:DAT |
Data in Hold Time |
0 |
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0 |
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μs |
tSU:DAT |
Data in Setup Time |
250 |
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100 |
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ns |
tR |
SDA and SCL Rise Time |
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1 |
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0.3 |
μs |
tF |
SDA and SCL Fall Time |
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300 |
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300 |
ns |
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tSU:STO |
Stop Condition Setup Time |
4.7 |
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0.6 |
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μs |
tDH |
Data Out Hold Time |
300 |
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50 |
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tWR |
Write Cycle Time - NM34C02 |
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10 |
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10 |
ms |
(Note 3) |
- NM34C02L, NM34C02LZ |
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15 |
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15 |
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Note 3: The write cycle time (tWR) 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 NM34C02 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.
Interface Bus Wire-2 Standard Bit-2K NM34C02
4 |
www.fairchildsemi.com |
NM34C02 Rev. D.2