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SC23M42
256-BYTE MEMORY CARD IC
DESCRIPTION
SC23M42 is a smart card module utilizing CMOS EEPROM technology. 256 bytes main memory, 32-bit protection memory, 3 bytes user password, and 3-bit password wrong counter (Value: 00000D2D1D0). And the periphery interface is compatible with ISO7816 agreement (synchronous propagation).
FEATURES
* 256 X 8 bit EEPROM * Byte addressing * Write-protect area (former 32 bytes) can execute the write-protect separately, and after the write-protect, the content cannot be changed. * 32 X 1bit protect memory * Serial two buses interface * More than 100,000 times write endurance cycles * Data retention of more than 10 years * Contact definition and serial interface comply to ISO7816 specification (synchronous propagation) * 3 Bytes user password, 3 bits(bit0-bit2) error counter * Before the password is checked, all the data can be read; if the password is correct, you can write or amend the data and the password. * Password error counter, and the initial value is 3. Checking the
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ORDERING INFORMATION
Device SC23M42A SC23M42B Package P6-05 MCTS012402
APPLICATIONS
* used for various IC memory cards.
password once, subtracts 1, if the value of the counter is 0, the memory card will be locked automatically, and the data can only be read, the password cannot be checked again; When the value of the counter is not 0, if the password checking is correct for one time, the value comes back to initial value.
* Comply to SLE4442
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SC23M42
BLOCK DIAGRAM
EEPROM
High voltage generator Reference current generator
Address decoder
Address and data register, comparator
Program control
Timing and encipher logic
Power on reset detector
Interface
VCC
GND
I/O
RST
CLK
ABSOLUTE MAXIMUM RATINGS
Characteristics Power Supply Voltage Input Voltage www..com Storage Temperature Power Dissipation Symbol VCC VI Tstg PD Ratings -0.3~6 -0.3~6 -40~125 70 Unit V V C mW
DC ELECTRICAL CHARACTERISTICS (VCC=5V, Tamb =25C)
Characteristics Power Supply Voltage Operating Current H Input Voltage(I/O, CLK, RST) L Input Voltage(I/O, CLK, RST) H Input Current(I/O, CLK, RST) L Output Current(VL=0.4V,Open-drain) H Leakage Current(VH=VCC, Opendrain) Input Capacitance Operating Frequency Symbol VCC ICC VIH VI IH IOL IOH CI FOSC Condition Min. 2.4 -3.0 0 -0.5 --7 Typ. -3 --3 1.0 --20 Max. 5.5 10 VCC 1.2 5 -1 10 50 Unit V mA V V A mA A pF kHz
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SC23M42
AC ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, VCC=5.0V, Tamb=25C, and testing frequency is 20 kHz) Characteristics Reset Time CLK (High Level) CLK (Low Level) Write Time Erase Time Set-up Time(D/CLK) Set-up Time (CLK/RST) Set-up Time (RST/CLK) Hold Time (D/CLK) Delay Time (CLK/D) Rise Time (I/O, CLK, RST) Fall Time (I/O, CLK, RST) Symbol tRE tH tL tW tE td1 td3 td4 td5 td2 tR tF Condition Min. 9 10 10 5 5 4 4 4 4 6 --Typ. ------------Max. ----------1 1 Unit s s s ms ms s s s s s s s
PIN CONFIGURATION
VCC 1 RST 2 CLK 3 NC 4 (Contact of the card)
8 GND 7 NC 6 I/O 5 NC
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PIN DESCRIPTIONS
Pin No. 1 2 3 4 5 6 7 8 Symbol VCC RST CLK NC GND NC I/O NC I/O -I I ---I/O -Power supply voltage is 5V Reset signal Clock signal No connect Ground No connect Data bus(open-drain output) No connect Description
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SC23M42
FUNCTION DESCRIPTIONS
SC23M42 provides 256x8 bits EEPROM memory units and 32x1 protect units, and there is writing-protect for the former 32-bit bytes. Except PSC (Programmable Security Code) memory unit, all units are readable. The unit can be erased and written before the write-protect is active, or else the unit is only readable after the write-protect. The bit with write-protection can be programmed only once, and cannot be erased. The chip has one 3-bit (bit0bit2)error register which provides 3 times continuous PSC authentication at most, after 3 times the chip cannot be erased and written. Transmission Protocols Transmit the data by serial two buses between IFD and IC memory cards. The transmission protocols can be defined as four operation mathods -Reset and reset acknowledge -Command -Output the data -Process 1. Reset and reset acknowledge The chips enter the power on reset state when it is power on, and this state will be ended by the reset signal. The reset signal begins when RST changed from" to " and end when CLK changed from " to" . The reset 0" 1" 0" 1" signal can stop any active instruction. Read operation must be carried out first after power on reset, then the other operations. The reset acknowledge complies to ISO7816-3 synchronous propagation. The address counter is set to " 0" automatically and will send the first data to the I/O port. As the clock signal, the address data can be read serially. And the content of the former 4 EEPROM address units can be read after the continuous 32 clock pulses, and then the 33rd clock pulse will set I/O to H state. The details refer to the figure 1.
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Figure 1 Reset and reset acknowledge Byte 1 DO7... DO0 Byte2 DO15... DO8 Byte3 DO23... DO16 Byte4 DO31... DO24
Reset acknowledge (Hex)
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SC23M42
2. Instruction format Instruction table Byte1control B7B6B5B4 0011 0011 0011 0011 0011 0011 0011 B3B2B1B0 0000 1000 0100 1100 0001 1001 0011 Byte2 Address A7-A0 Address bit Address bit invalid Address bit invalid Address bit Address bit Byte3 Data D7-D0 invalid Input data invalid Input data invalid Input data Input data Operation Read the main memory Write the main memory Read protect memory Write protect memory Read password memory Amend password memory Compare data Figure 2 Command input time sequence
Command IFD Sets I/O to level L
Method Output data Process Output data Process Output data Process Process
authentication
CLK
0
1
2
7
8
9
10
15
16
17
18
23
24
I/O
B0
B1
B6
B7
A0
A1
A6
A7
D0
D1
D6
D7
Start from IFD
Stop from IFD
3. Instruction description 1) Read main memory
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Control B7 0 B6 0 B5 1 B4 1 30H B3 0 B2 0 B1 0 B0 0
Address A7... A0 Address 00H... FFH
Data D7... D0 No effect No effect
Binary Hex
This command will read the data from current byte address N to the last address and the needed pulse number m=(256-N) x8+1
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SC23M42
2) Write main memory Control B7 Binary Hex 0 B6 0 B5 1 B4 1 38H B3 1 B2 0 B1 0 B0 0 Address A7... A0 Address 00H... FFH Data D7... D0 Input data Input data
This command writes the main memory in bytes. According to the new and old data, carry out one of the operations below in process mode: Erase and write Only erase Only write (5ms) Corresponding pulse number m=245 (2.5ms) Corresponding pulse number m=124 (2.5ms) Corresponding pulse number m=124
(All the time value is calculated according to the 50 kHz clock frequency.)
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3) Read protect memory Control B7 Binary Hex 0 B6 0 B5 1 B4 1 34H B3 0 B2 1 B1 0 B0 0 Address A7... A0 No effect No effect Data D7... D0 No effect No effect
This command will read the content of all the protect memory (32bit), and display that whether the data of corresponding address unit can be changed.
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SC23M42
4) Write protect memory Control B7 Binary Hex 0 B6 0 B5 1 B4 1 3CH B3 1 B2 1 B1 0 B0 0 Address A7... A0 Address 00H... 1FH Data D7... D0 Input data Input data
Compare the command input data and the original data of this unit, if they are the same, then corresponding write-protect bit is active, and the unit is only readable. 5) Read password memory Control B7 Binary Hex 0 B6 0 B5 1 B4 1 B3 0 31H B2 0 B1 0 B0 1 Address A7... A0 No effect No effect Data D7... D0 No effect No effect
Read the 4 bytes content of password memory.
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6) Change password memory Control B7 Binary Hex 0 B6 0 B5 1 B4 1 39H B3 1 B2 0 B1 0 B0 1 Address A7... A0 Address 00H... 03H Data D7... D0 Input data Input data
The password memory can be changed after PSC authentication, or else some bit of error counter will change from " to " . 1" 0"
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SC23M42
7) Compare authentication data Control B7 Binary Hex 0 B6 0 B5 1 B4 1 33H B3 0 B2 0 B1 1 B0 1 Address A7... A0 Address 00H... 03H Data D7... D0 Input data Input data
Validate the appointed byte of PSC each time.
4. Password authentication The SC23M42 is only readable without PSC authentication. The content of PSC cannot be read, if you try to read PSC, you will get " . 00" The authentication steps are as follows: --Write to one bit of the error counter (EC) which has not been written, and the EC address is" ; 00" --Input the first byte data of PSC code, and the address is" 01" --Input the second byte data of PSC code, and the address is " 02" -- Input the third byte data of PSC code, and the address is " 03" --If pass the authentication, EC can be erased. If the initial value of the error counter is " , the error counter cannot be written, and also cannot go through 00" www..com the password authentication. After the PSC authentication, I/O port will change from " to " at the raising edge 1" 0" of the second clock no matter pass the authentication or not. When RST changes from " to" I/O port returns 0" 1" to " . The flow chart is as follows: 1"
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SC23M42
Figure8 PSC authentication flow chart
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SC23M42
PACKAGE OUTLINE
P6-05 UNIT: mm
MCTS012402
UNIT: mm
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SC23M42
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
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