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| ST93CS56 ST93CS57 2K (128 x 16) SERIAL MICROWIRE EEPROM NOT FOR NEW DESIGN 1 MILLION ERASE/WRITE CYCLES, with 40 YEARS DATA RETENTION SELF-TIMED PROGRAMMING CYCLE with AUTO-ERASE READY/BUSY SIGNAL DURING PROGRAMMING SINGLE SUPPLY VOLTAGE - 3V to 5.5V for the ST93CS56 - 2.5V to 5.5V for the ST93CS57 USER DEFINED WRITE PROTECTED AREA PAGE WRITE MODE (4 WORDS) SEQUENTIAL READ OPERATION 5ms TYPICAL PROGRAMMING TIME ST93CS56 and ST93CS57 are replaced by the M93S56 8 1 PSDIP8 (B) 0.4mm Frame 8 1 SO8 (M) 150mil Width Figure 1. Logic Diagram DESCRIPTION The ST93CS56 and ST93CS57 are 2K bit Electrically Erasable Programmable Memory (EEPROM) fabricated with SGS-THOMSON's High Endurance Single Polysilicon CMOS technology. The memory is accessed through a serial input D and output Q. The 2K bit memory is organized as 128 x 16 bit words.The memory is accessed by a set of instructions which include Read, Write, Page Write, Write All and instructions used to set the memory protection. A Read instruction loads the address of the first word to be read into an internal address pointer. Table 1. Signal Names S D Q C PRE W VCC VSS Chip Select Input Serial Data Input Serial Data Output Serial Clock Protect Enable Write Enable Supply Voltage Ground VCC D C S PRE W ST93CS56 ST93CS57 Q VSS AI00896B June 1997 This is information on a product still in production bu t not recommended for new de signs. 1/16 ST93CS56, ST93CS57 Figure 2A. DIP Pin Connections Figure 2B. SO Pin Connections ST93CS56 ST93CS57 S C D Q 1 2 3 4 8 7 6 5 AI00897B ST93CS56 ST93CS57 VCC PRE W VSS S C D Q 1 2 3 4 8 7 6 5 AI00898C VCC PRE W VSS Table 2. Absolute Maximum Ratings (1) Symbol TA TSTG TLEAD VIO VCC VESD Parameter Ambient Operating Temperature Storage Temperature Lead Temperature, Soldering (SO8 package) (PSDIP8 package) 40 sec 10 sec Value -40 to 85 -65 to 150 215 260 -0.3 to VCC +0.5 -0.3 to 6.5 (2) Unit C C C V V V V Input or Output Voltages (Q = VOH or Hi-Z) Supply Voltage Electrostatic Discharge Voltage (Human Body model) Electrostatic Discharge Voltage (Machine model) (3) 3000 500 Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the SGS-THOMSON SURE Program and other relevant quality documents. 2. MIL-STD-883C, 3015.7 (100pF, 1500 ). 3. EIAJ IC-121 (Condition C) (200pF, 0 ). DESCRIPTION (cont'd) The data is then clocked out serially. The address pointer is automatically incremented after the data is output and, if the Chip Select input (S) is held High, the ST93CS56/57 can output a sequential stream of data words. In this way, the memory can be read as a data stream of 16 to 2048 bits, or continuously as the address counter automatically rolls over to 00 when the highest address is reached. Within the time required by a programming cycle (tW), up to 4 words may be written with the help of the Page Write instruction; the whole memory may also be erased, or set to a predetermined pattern, by using the Write All instruction. Within the memory, an user defined area may be protected against further Write instructions. The size of this area is defined by the content of a Protect Register, located outside of the memory array. As a final protection step, data may be permanently protected by programming a One Time Programing bit (OTP bit) which locks the Protect Register content. Programming is internally self-timed (the external clock signal on C input may be disconnected or left running after the start of a Write cycle) and does not require an erase cycle prior to the Write instruction. The Write instruction writes 16 bits at one time into one of the 128 words, the Page Write instruction writes up to 4 words of 16 bits to sequential locations, assuming in both cases that all addresses are outside the Write Protected area. After the start of the programming cycle, a Ready/Busy signal is available on the Data output (Q) when the Chip Select (S) input pin is driven High. 2/16 ST93CS56, ST93CS57 AC MEASUREMENT CONDITIONS Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Reference Voltages 20ns 0.2VCC to 0.8VCC 0.3VCC to 0.7VCC Figure 3. AC Testing Input Output Waveforms 0.8VCC 0.7VCC 0.3VCC AI00825 0.2VCC Note that Output Hi-Z is defined as the point where data is no longer driven. Table 3. Capacitance (1) (TA = 25 C, f = 1 MHz ) Symbol C IN COUT Parameter Input Capacitance Output Capacitance Test Condition VIN = 0V VOUT = 0V Min Max 5 5 Unit pF pF Note: 1. Sampled only, not 100% tested. Table 4. DC Characteristics (TA = 0 to 70C or -40 to 85C; VCC = 3V to 5.5V for ST93CS56 and VCC = 2.5V to 5.5V for ST93CS57) Symbol ILI ILO ICC Parameter Input Leakage Current Output Leakage Current Supply Current (TTL Inputs) Supply Current (CMOS Inputs) ICC1 Supply Current (Standby) Input Low Voltage (ST93CS56,57) VIL Input Low Voltage (ST93CS56) Input Low Voltage (ST93CS57) Input High Voltage (ST93CS56,57) VIH Input High Voltage (ST93CS56) Input High Voltage (ST93CS57) VOL Output Low Voltage Test Condition 0V VIN VCC 0V VOUT VCC, Q in Hi-Z S = VIH, f = 1 MHz S = VIH, f = 1 MHz S = VSS, C = VSS 4.5V VCC 5.5V 3V VCC 5.5V 2.5V VCC 5.5V 4.5V VCC 5.5V 3V VCC 5.5V 2.5V VCC 5.5V IOL = 2.1mA IOL = 10 A VOH Output High Voltage IOH = -400A IOH = -10A 2.4 VCC - 0.2 -0.1 -0.1 -0.1 2 0.8 VCC 0.8 VCC Min Max 2.5 2.5 3 2 50 0.8 0.2 VCC 0.2 VCC VCC + 1 VCC + 1 VCC + 1 0.4 0.2 Unit A A mA mA A V V V V V V V V V V 3/16 ST93CS56, ST93CS57 Table 5. AC Characteristics (TA = 0 to 70C or -40 to 85C; VCC = 3V to 5.5V for ST93CS56 and VCC = 2.5V to 5.5V for ST93CS57) Symbol tPRVCH tWVCH tSHCH tDVCH tCHDX tCHQL tCHQV tCLPRX tSLWX tCLSL tSLSH tSHQV tSLQZ tCHCL tCLCH tW fC Alt tPRES tPES tCSS tDIS tDIH tPD0 tPD1 tPREH tPEH tCSH tCS tSV tDF tSKH tSKL tWP fSK Parameter Protect Enable Valid to Clock High Write Enable Valid to Clock High Chip Select High to Clock High Input Valid to Clock High Clock High to Input Transition Clock High to Output Low Clock High to Output Valid Clock Low to Protect Enable Transition Chip Select Low to Write Enable Transition Clock Low to Chip Select Transition Chip Select Low to Chip Select High Chip Select High to Output Valid Chip Select Low to Output Hi-Z Clock High to Clock Low Clock Low to Clock High Erase/Write Cycle time Clock Frequency 0 Note 2 Note 2 250 250 10 1 Note 1 0 250 0 250 500 300 Test Condition Min 50 50 50 100 100 500 500 Max Unit ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ms MHz Notes: 1. Chip Select must be brought low for a minimum of 250 ns (tSLSH) between consecutive instruction cycles. 2. The Clock frequency specification calls for a minimum clock period of 1 s, therefore the sum of the timings tCHCL + tCLCH must be greater or equal to 1 s. For example, if tCHCL is 250 ns, then tCLCH must be at least 750 ns. Figure 4. Synchronous Timing, Start and Op-Code Input PRE tPRVCH W tWVCH C tSHCH S tDVCH D START OP CODE tCHDX OP CODE tCLCH tCHCL OP CODE INPUT START AI00887 4/16 ST93CS56, ST93CS57 Figure 5. Synchronous Timing, Read or Write C tCLSL S tDVCH D An tCHQL Q15/Q7 tCHDX A0 tSLQZ Q0 tCHQV tSLSH Hi-Z Q ADDRESS INPUT DATA OUTPUT AI00820C PRE tCLPRX W tSLWX C tCLSL S tSLSH tDVCH D An tCHDX A0/D0 tSHQV Hi-Z Q BUSY tW ADDRESS/DATA INPUT WRITE CYCLE AI00888B tSLQZ READY 5/16 ST93CS56, ST93CS57 POWER-ON DATA PROTECTION In order to prevent data corruption and inadvertent write operations during power up, a Power On Reset (POR) circuit resets all internal programming circuitry and sets the device in the Write Disable mode. When VCC reaches its functional value, the device is properlyreset (in the Write Disable mode) and is ready to decode and execute an incoming instruction. A stable VCC must be applied before any logic signal. INSTRUCTIONS The ST93CS56/57 has eleven instructions, as shown in Table 6. Each instruction is composed of a 2 bit op-code and an 8 bit address. Each instruction is preceded by the rising edge of the signal Table 6. Instruction Set Instruction READ Description Read Data from Memory W pin (1) X PRE pin '0' Op Code 10 Address (1, 2) applied on the Chip Select ( S) input (assuming that the Clock C is low). The data input D is then sampled upon the following rising edges of the clock C until a '1' is sampled and decoded by the ST93CS56/57 as a Start bit. The ST93CS56/57 is fabricated in CMOS technology and is therefore able to run from zero Hz (static input signals) up to the maximum ratings (specified in Table 5). Read The Read instruction (READ) outputs serial data on the Data Output (Q). When a READ instruction is received, the instruction and address are decoded and the data from the memory is transferred into an output shift register. Adummy '0' bit is output first followed by the 16 bit word with the MSB first. Data Q15-Q0 Additional Information A7-A0 WRITE Write Data to Memory '1' '0' 01 A7-A0 D15-D0 Write is executed if the address is not inside the Protected area Write is executed if all the addresses are not inside the Protected area Write all data if the Protect Register is cleared PAWRITE Page Write to Memory '1' '0' 11 A7-A0 D15-D0 WRALL WEN WDS Write All Memory Write Enable Write Disable '1' '1' X '0' '0' '0' 00 00 00 01XX XXXX 11XX XXXX 00XX XXXX D15-D0 PRREAD Protect Register Read X '1' 10 XXXX XXXX Q8-Q0 Data Output = Protect Register content + Protect Flag bit Data above specified address A7-A0 are protected (2) Protect Flag is also cleared (cleared Flag = 1) PRWRITE Protect Register Write '1' '1' 01 A7-A0 PRCLEAR PREN PRDS Protect Register Clear Protect Register Enable Protect Register Disable '1' '1' '1' '1' '1' '1' 11 00 00 1111 1111 11XX XXXX 0000 0000 OTP bit is set permanently Notes: 1. X = don't care bit. 2. Address bit A7 is not decoded by the ST93CS56/57. 6/16 ST93CS56, ST93CS57 Output data changes are triggered by the Low to High transition of the Clock (C). The ST93CS56/57 will automatically increment the address and will clock out the next word as long as the Chip Select input (S) is held High. In this case the dummy '0' bit is NOT output between words and a continuous stream of data can be read. Write Enable and Write Disable The Write Enable instruction (WEN) authorizes the following Write instructions to be executed, the Write Disable instruction (WDS) disables the execution of the following Erase/Write instructions. When power is first applied, the ST93CS56/57 enters the Disable mode. When the Write Enable instruction (WEN) is executed, Write instructions remain enabled until a Write Disable instruction (WDS) is executed or if the Power-on reset circuit becomes active due to a reduced VCC. To protect the memory contents from accidental corruption, it is advisable to issue the WDS instruction after every write cycle. The READ instruction is not affected by the WEN or WDS instructions. Write The Write instruction (WRITE) is followed by the address and the word to be written. The Write Enable signal (W) must be held high during the WRITE instruction. Data input D is sampled on the Low to High transition of the clock. After the last data bit has been sampled, Chip Select (S) must be brought Low before the next rising edge of the clock (C), in order to start the self-timed programming cycle, providing that the address is NOT in the protected area. If the ST93CS56/57 is still performing the programming cycle, the Busy signal (Q = 0) will be returned if the Chip Select input (S) is driven high, and the ST93CS56/57 will ignore any data on the bus. When the write cycle is completed, the Ready signal (Q = 1) will indicate (if S is driven high) that the ST93CS56/57 is ready to receive a new instruction. Page Write A Page Write instruction (PAWRITE) contains the first address to be written followed by up to 4 data words. The Write Enable signal (W) must be held High duringthe Write instruction. Input address and data are read on the Low to High transition of the clock. After the receipt of each data word, bits A1-A0 of the internal address register are incremented, the high order bits A7-A2 remaining unchanged. Users must take care by software to ensure that the last word address has the same five upper order address bits as the initial address transmitted to avoid address roll-over. After the LSB of the last data word, Chip Select (S) must be brought Low before the next rising edge of the Clock (C). The falling edge of Chip Select (S) initiates the internal, self-timed write cycle. The Page Write operation will not be performed if any of the 4 words is addressing the protected area. If the ST93CS56/57 is still performing the programming cycle, the Busy signal (Q = 0) will be returned if the Chip Select input (S) is driven high, and the ST93CS56/57 will ignore any data on the bus. When the write cycle is completed, the Ready signal (Q = 1) will indicate (if S is driven high) that the ST93CS56/57is ready to receive a new instruction. Write All The Write All instruction (WRALL) is valid only after the Protect Register has been cleared by executing a PRCLEAR (Protect Register Clear) instruction. The Write All instruction simultaneously writes the whole memory with the same data word included in the instruction. The Write Enable signal (W) must be held High before and during the Write instruction. Input address and data are read on the Low to High transition of the clock. If the ST93CS56/57 is still performing the programming cycle, the Busy signal (Q = 0) will be returned if the Chip Select input (S) is driven high, and the ST93CS56/57 will ignore any data on the bus. When the write cycle is completed, the Ready signal (Q = 1) will indicate (if S is driven high) that the ST93CS56/57 is ready to receive a new instruction. MEMORY WRITE PROTECTION AND PROTECT REGISTER The ST93CS56/57 offers a Protect Register containing the bottom address of the memory area which has to be protected against write instructions. In addition to this Protect Register, two flag bits are used to indicate the Protect Register status: the Protect Flag enabling/disabling the protection of theProtect Register and the OTP bit which, when set, disables access to the Protect Register and thus prevents any further modifications of this Protect Register value. The content of the Protect Register is defined when using the PRWRITE instruction, it may be read when using the PRREAD instruction. A specific instruction PREN (Protect Register Enable) allows the user to execute the protect instructions PRCLEAR, PRWRITE and PRDS; this PREN instruction being used together with the signals applied on the input pins PRE (Protect Register Enable pin) and W (Write Enable). 7/16 ST93CS56, ST93CS57 Figure 6. READ, WRITE, WEN, WDS Sequences READ PRE S D 1 1 0 An A0 Q ADDR OP CODE Qn DATA OUT Q0 WRITE PRE W S CHECK STATUS D 1 0 1 An A0 Dn D0 Q ADDR OP CODE DATA IN BUSY READY WRITE ENABLE PRE WRITE DISABLE PRE W S S D 1 0 0 0 0 Xn X0 D 1 0 0 1 1 Xn X0 OP CODE OP CODE AI00889D 8/16 ST93CS56, ST93CS57 Figure 7. PAWRITE, WRALL Sequences PAGE WRITE PRE W S CHECK STATUS D 1 1 1 An A0 Dn D0 Q ADDR OP CODE DATA IN BUSY READY WRITE ALL PRE W S CHECK STATUS D 1 0 0 0 1 Xn X0 Dn D0 Q ADDR OP CODE AI00890C DATA IN BUSY READY 9/16 ST93CS56, ST93CS57 MEMORY WRITE PROTECTION (cont'd) Accessing the Protect Register is done by executing the following sequence: - WEN: execute the Write Enable instruction, - PREN: execute the PREN instruction, - PRWRITE, PRCLEAR or PRDS: the protection then may be defined, in terms of size of the protected area (PRWRITE, PRCLEAR) and may be set permanently (PRDS instruction). Protect Register Read The Protect Register Read instruction (PRREAD) outputs on the Data Output Q the content of the Protect Register, followed by the Protect Flag bit. The Protect Register Enable pin (PRE) must be driven High before and during the instruction. As in the Read instruction a dummy '0' bit is output first. Since it is not possible to distinguish if the Protect Register is cleared (all 1's) or if it is written with all 1's, user must check the Protect Flag status (and not the Protect Register content) to ascertain the setting of the memory protection. Protect Register Enable The Protect Register Enable instruction (PREN) is used to authorize the use of further PRCLEAR, PRWRITE and PRDS instructions. The PREN insruction does not modify the Protect Flag bit value. Note: A Write Enable (WEN) instruction must be executed before the Protect Enable instruction. Both the Protect Enable (PRE) and Write Enable (W) input pins must be held High during the instruction execution. Protect Register Clear The Protect Register Clear instruction (PRCLEAR) clears the address stored in the Protect Register to all 1's, and thus enables the execution of WRITE and WRALL instructions. The Protect Register Clear execution clears the Protect Flag to '1'. Both the Protect Enable (PRE) and Write Enable (W) input pins must be driven High during the instruction execution. Note: A PREN instruction must immediately precede the PRCLEAR instruction. Protect Register Write The Protect Register Write instruction (PRWRITE) is used to write into the Protect Register the address of the first word to be protected. After the PRWRITE instruction execution, all memory locations equal to and above the specified address, are protected from writing. The Protect Flag bit is set to '0', it can be read with Protect Register Read instruction. Both the Protect Enable (PRE) and Write Enable (W) input pins must be driven High during the instruction execution. Note: A PREN instruction must immediately precede the PRWRITE instruction, but it is not necessary to execute first a PRCLEAR. Protect Register Disable The Protect Register Disable instruction sets the One Time Programmable bit (OTP bit). The Protect Register Disable instruction (PRDS) is a ONE TIME ONLY instruction which latches the Protect Register content, this content is therefore unalterable in the future. Both the Protect Enable(PRE) and Write Enable (W) input pins must be driven High during the instruction execution. The OTP bit cannot be directly read, it can be checked by reading the content of the Protect Register (PRREAD instruction), then by writing this same value into the Protect Register (PRWRITE instruction): when the OTP bit is set, the Ready/Busy status cannot appear on the Data output (Q); when the OTP bit is not set, the Busy status appear on the Data output (Q). A PREN instruction must immediately precede the PRDS instruction. READY/BUSY Status When the ST93CS56/57 is performing the write cycle, the Busy signal (Q = 0) is returned if S is driven high, and the ST93CS56/57 will ignore any data on the bus. When the write cycle is completed, the Ready signal (Q = 1) will indicate, if S is driven high, that the ST93CS56/57 is ready to receive a new instruction. Once the ST93CS56/57 is Ready, the Data Output Q is set to '1' until a new Start bit is decoded or the Chip Select is brought Low. COMMON I/O OPERATION The Data Output (Q) and Data Input (D) signals can be connected together, through a current limiting resistor, to form a common, one wire data bus. Some precautions must be taken when operating the memory with this connection, mostly to prevent a short circuit between the last entered address bit (A0) and the first data bit output by Q. The reader should refer to the SGS-THOMSON application note "MICROWIRE EEPROM Common I/O Operation". 10/16 ST93CS56, ST93CS57 Figure 8. PRREAD, PRWRITE, PREN Sequences Protect Register READ PRE S D 1 1 0 Xn X0 Q An A0 F ADDR OP CODE DATA OUT F = Protect Flag Protect Register WRITE PRE W S CHECK STATUS D 1 0 1 An A0 Q ADDR OP CODE BUSY READY Protect Register ENABLE PRE W S D 1 0 0 1 1 Xn X0 OP CODE AI00891D 11/16 ST93CS56, ST93CS57 Figure 9. PRCLEAR, PRDS Sequences Protect Register CLEAR PRE W S CHECK STATUS D 1 11 111 Q ADDR OP CODE BUSY READY Protect Register DISABLE PRE W S CHECK STATUS D 1 00 000 Q ADDR OP CODE AI00892C BUSY READY 12/16 ST93CS56, ST93CS57 ORDERING INFORMATION SCHEME Example: ST93CS56 M 1 013TR Operating Voltage 56 57 3V to 5.5V 2.5V to 5.5V M B Package PSDIP8 0.4 mm Frame SO8 150mil Width Temp. Range 1 6 0 to 70 C -40 to 85 C Option 013TR Tape & Reel Packing 3 (1) -40 to 125 C Note: 1. Temperature range on special request only. Devices are shipped from the factory with the memory content set at all "1's" (FFFFh). For a list of available options (Operating Voltage, Package, etc...) or for further information on any aspect of this device, please contact the SGS-THOMSON Sales Office nearest to you. 13/16 ST93CS56, ST93CS57 PSDIP8 - 8 pin Plastic Skinny DIP, 0.4mm lead frame Symb Typ A A1 A2 B B1 C D E E1 e1 eA eB L N CP PSDIP8 mm Min Max 4.80 0.70 3.10 0.38 1.15 0.38 9.20 7.62 - 6.30 2.54 - 8.40 - 3.60 0.58 1.65 0.52 9.90 - 7.10 - - 9.20 3.00 8 0.10 3.80 0.100 0.300 Typ inches Min Max 0.189 0.028 0.122 0.015 0.045 0.015 0.362 - 0.248 - 0.331 - 0.142 0.023 0.065 0.020 0.390 - 0.280 - - 0.362 0.118 8 0.004 0.150 A2 A1 B B1 D N A L eA eB C e1 E1 1 E PSDIP-a Drawing is not to scale 14/16 ST93CS56, ST93CS57 SO8 - 8 lead Plastic Small Outline, 150 mils body width Symb Typ A A1 B C D E e H h L N CP SO8 mm Min 1.35 0.10 0.33 0.19 4.80 3.80 1.27 - 5.80 0.25 0.40 0 8 0.10 Max 1.75 0.25 0.51 0.25 5.00 4.00 - 6.20 0.50 0.90 8 0.050 Typ inches Min 0.053 0.004 0.013 0.007 0.189 0.150 - 0.228 0.010 0.016 0 8 0.004 Max 0.069 0.010 0.020 0.010 0.197 0.157 - 0.244 0.020 0.035 8 h x 45 A C B e D CP N E 1 H A1 L SO-a Drawing is not to scale 15/16 ST93CS56, ST93CS57 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1997 SGS-THOMSON Microelectronics - All Rights Reserved (R) MICROWIRE is a registered trademark of National Semiconductor Corp. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 16/16 |
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