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APPLICATION NOTE
AVAILABLE
X25320 32K
AN61
X25320
SPI Serial E2PROM With Block LockTM Protection
DESCRIPTION
4K x 8 Bit
FEATURES
* 2MHz Clock Rate * SPI Modes (0,0 & 1,1) * 4K X 8 Bits -- 32 Byte Page Mode * Low Power CMOS -- <1A Standby Current -- <5mA Active Current During Write * 2.7V To 5.5V Power Supply * Block Lock Protection -- Protect 1/4, 1/2 or all of E2PROM Array * Built-in Inadvertent Write Protection -- Power-Up/Power-Down protection circuitry -- Write Enable Latch -- Write Protect Pin * Self-Timed Write Cycle -- 5ms Write Cycle Time (Typical) * High Reliability -- Endurance: 100,000 cycles -- Data Retention: 100 Years -- ESD protection: 2000V on all pins * 8-Lead PDlP Package * 8-Lead SOIC Package * 14-Lead TSSOP Package FUNCTIONAL DIAGRAM
STATUS REGISTER WRITE PROTECT LOGIC
The X25320 is a CMOS 32768-bit serial E2PROM, internally organized as 4K x 8. The X25320 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple three-wire bus. The bus signals are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a chip select (CS) input, allowing any number of devices to share the same bus. The X25320 also features two additional inputs that provide the end user with added flexibility. By asserting the HOLD input, the X25320 will ignore transitions on its inputs, thus allowing the host to service higher priority interrupts. The WP input can be used as a hardwire input to the X25320 disabling all write attempts to the status register, thus providing a mechanism for limiting end user capability of altering 0, 1/4, 1/2 or all of the memory. The X25320 utilizes Xicor's proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles and a minimum data retention of 100 years.
X DECODE LOGIC 32
4K BYTE ARRAY
32 X 256 SO SI SCK CS HOLD COMMAND DECODE AND CONTROL LOGIC 32 32 X 256
64 64 X 256
WP
WRITE CONTROL AND TIMING LOGIC 32 8 Y DECODE DATA REGISTER
3063 ILL F01
Direct WriteTM and Block LockTM Protection is a trademark of Xicor, Inc. (c)Xicor, Inc. 1994, 1995, 1996 Patents Pending 3063-3.9 6/11/96 T4/C1/D0 NS
1
Characteristics subject to change without notice
X25320
PIN DESCRIPTIONS Serial Output (SO) SO is a push/pull serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. Serial Input (SI) SI is the serial data input pin. All opcodes, byte addresses, and data to be written to the memory are input on this pin. Data is latched by the rising edge of the serial clock. Serial Clock (SCK) The Serial Clock controls the serial bus timing for data input and output. Opcodes, addresses, or data present on the SI pin are latched on the rising edge of the clock input, while data on the SO pin change after the falling edge of the clock input. Chip Select (CS) When CS is HIGH, the X25320 is deselected and the SO output pin is at high impedance and unless an internal write operation is underway, the X25320 will be in the standby power mode. CS LOW enables the X25320, placing it in the active power mode. It should be noted that after power-on, a HIGH to LOW transition on CS is required prior to the start of any operation. Write Protect (WP) When WP is LOW and the nonvolatile bit WPEN is "1", nonvolatile writes to the X25320 status register are disabled, but the part otherwise functions normally. When WP is held HIGH, all functions, including nonvolatile writes operate normally. WP going LOW while CS is still LOW will interrupt a write to the X25320 status register. If the internal write cycle has already been initiated, WP going LOW will have no effect on a write. The WP pin function is blocked when the WPEN bit in the status register is "0". This allows the user to install the X25320 in a system with WP pin grounded and still be able to write to the status register. The WP pin functions will be enabled when the WPEN bit is set "1". Hold (HOLD) HOLD is used in conjunction with the CS pin to select the device. Once the part is selected and a serial sequence is underway, HOLD may be used to pause the serial communication with the controller without resetting the serial sequence. To pause, HOLD must be brought LOW while SCK is LOW. To resume communication, HOLD is brought HIGH, again while SCK is LOW. If the pause feature is not used, HOLD should be held HIGH at all times. PIN CONFIGURATION
DIP/SOIC CS SO WP VSS 1 2 3 4 X25320 8 7 6 5 VCC HOLD SCK SI
TSSOP CS SO NC NC NC WP VSS 1 2 3 4 5 6 7 14 13 12 X25320 11 10 9 8 VCC HOLD NC NC NC SCK SI
3063 ILL F02.2
PIN NAMES SYMBOL CS SO SI SCK WP VSS VCC HOLD NC DESCRIPTION Chip Select Input Serial Output Serial Input Serial Clock Input Write Protect Input Ground Supply Voltage Hold Input No Connect
3063 PGM T01
2
X25320
PRINCIPLES OF OPERATION The X25320 is a 4K x 8 designed to interface directly with the synchronous serial peripheral interface (SPI) of many popular microcontroller families. The X25320 contains an 8-bit instruction register. It is accessed via the SI input, with data being clocked in on the rising SCK. CS must be LOW and the HOLD and WP inputs must be HIGH during the entire operation. The WP input is "Don't Care" if WPEN is set "0". Table 1 contains a list of the instructions and their opcodes. All instructions, addresses and data are transferred MSB first. Data input is sampled on the first rising edge of SCK after CS goes LOW. SCK is static, allowing the user to stop the clock and then resume operations. If the clock line is shared with other peripheral devices on the SPI bus, the user can assert the HOLD input to place the X25320 into a "PAUSE" condition. After releasing HOLD, the X25320 will resume operation from the point when HOLD was first asserted. Write Enable Latch The X25320 contains a "write enable" latch. This latch must be SET before a write operation will be completed internally. The WREN instruction will set the latch and the WRDI instruction will reset the latch. This latch is automatically reset upon a power-up condition and after the completion of a byte, page, or status register write cycle. E2PROM Status Register The RDSR instruction provides access to the status register. The status register may be read at any time, even during a write cycle. The status register is formatted as follows: 7 6 WPEN X 5 X 4 X 3 BP1 2 BP0 1 WEL 0 WIP
3063 PGM T02
WPEN, BP0 and BP1 are set by the WRSR instruction. WEL and WIP are read-only and automatically set by other operations. The Write-In-Process (WIP) bit indicates whether the X25320 is busy with a write operation. When set to a "1", a write is in progress, when set to a "0", no write is in progress. During a write, all other bits are set to "1". The Write Enable Latch (WEL) bit indicates the status of the "write enable" latch. When set to a "1", the latch is set, when set to a "0", the latch is reset. The Block Protect (BP0 and BP1) bits are nonvolatile and allow the user to select one of four levels of protection. The X25320 is divided into four 8192-bit segments. One, two, or all four of the segments may be protected. That is, the user may read the segments but will be unable to alter (write) data within the selected segments. The partitioning is controlled as illustrated below. Status Register Bits BP1 BP0 0 0 1 1 0 1 0 1 Array Addresses Protected None $0C00-$0FFF $0800-$0FFF $0000-$0FFF
3063 PGM T03
Table 1. Instruction Set Instruction Name WREN WRDI RDSR WRSR READ WRITE Instruction Format* 0000 0110 0000 0100 0000 0101 0000 0001 0000 0011 0000 0010 Operation Set the Write Enable Latch (Enable Write Operations) Reset the Write Enable Latch (Disable Write Operations) Read Status Register Write Status Register Read Data from Memory Array beginning at selected address Write Data to Memory Array beginning at Selected Address (1 to 32 Bytes)
3063 PGM T04
*Instructions are shown MSB in leftmost position. Instructions are transferred MSB first.
3
X25320
Write-Protect Enable The Write-Protect-Enable (WPEN) is available for the X25320 as a nonvolatile enable bit for the WP pin.
WPEN WP 0 0 1 1 X X X X LOW LOW HIGH HIGH WEL 0 1 0 1 0 1 Blocks Blocks Register Protected Writable Protected Protected Protected Writable
3063 PGM T05.1
To read the status register the CS line is first pulled LOW to select the device followed by the 8-bit RDSR instruction. After the RDSR opcode is sent, the contents of the status register are shifted out on the SO line. The read status register sequence is illustrated in Figure 2. Write Sequence Prior to any attempt to write data into the X25320, the "write enable" latch must first be set by issuing the WREN instruction (See Figure 3). CS is first taken LOW, then the WREN instruction is clocked into the X25320. After all eight bits of the instruction are transmitted, CS must then be taken HIGH. If the user continues the write operation without taking CS HIGH after issuing the WREN instruction, the write operation will be ignored. To write data to the E2PROM memory array, the user issues the WRITE instruction, followed by the address and then the data to be written. This is minimally a thirty-two clock operation. CS must go LOW and remain LOW for the duration of the operation. The host may continue to write up to 32 bytes of data to the X25320. The only restriction is the 32 bytes must reside on the same page. If the address counter reaches the end of the page and the clock continues, the counter will "roll over" to the first address of the page and overwrite any data that may have been written. For the write operation (byte or page write) to be completed, CS can only be brought HIGH after bit 0 of data byte N is clocked in. If it is brought HIGH at any other time the write operation will not be completed. Refer to Figures 4 and 5 below for a detailed illustration of the write sequences and time frames in which CS going HIGH are valid. To write to the status register, the WRSR instruction is followed by the data to be written. Data bits 0, 1, 4, 5 and 6 must be "0". This sequence is shown in Figure 6. While the write is in progress following a status register or E2PROM write sequence, the status register may be read to check the WIP bit. During this time the WIP bit will be HIGH. Hold Operation The HOLD input should be HIGH (at VIH) under normal operation. If a data transfer is to be interrupted HOLD can be pulled LOW to suspend the transfer until it can be resumed. The only restriction is the SCK input must be LOW when HOLD is first pulled LOW and SCK must also be LOW when HOLD is released. The HOLD input may be tied HIGH either directly to VCC or tied to VCC through a resistor.
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Protected Protected Protected Writable Protected Protected Protected Writable Protected Protected Protected Writable
The Write Protect (WP) pin and the nonvolatile Write Protect Enable (WPEN) bit in the Status Register control the programmable hardware write protect feature. Hardware write protection is enabled when WP pin is LOW, and the WPEN bit is "1". Hardware write protection is disabled when either the WP pin is HIGH or the WPEN bit is "0". When the chip is hardware write protected, nonvolatile writes are disabled to the Status Register, including the Block Protect bits and the WPEN bit itself, as well as the block-protected sections in the memory array. Only the sections of the memory array that are not block-protected can be written. Note: Since the WPEN bit is write protected, it cannot be changed back to a "0", as long as the WP pin is held LOW.
Clock and Data Timing Data input on the SI line is latched on the rising edge of SCK. Data is output on the SO line by the falling edge of SCK. Read Sequence When reading from the E2PROM memory array, CS is first pulled LOW to select the device. The 8-bit READ instruction is transmitted to the X25320, followed by the 16-bit address of which the last 12 are used. After the READ opcode and address are sent, the data stored in the memory at the selected address is shifted out on the SO line. The data stored in memory at the next address can be read sequentially by continuing to provide clock pulses. The address is automatically incremented to the next higher address after each byte of data is shifted out. When the highest address is reached ($0FFF) the address counter rolls over to address $0000 allowing the read cycle to be continued indefinitely. The read operation is terminated by taking CS HIGH. Refer to the read E2PROM array operation sequence illustrated in Figure 1.
X25320
Operational Notes The X25320 powers-up in the following state: * The device is in the low power standby state. * A HIGH to LOW transition on CS is required to enter an active state and receive an instruction. * SO pin is high impedance. * The "write enable" latch is reset. Data Protection The following circuitry has been included to prevent inadvertent writes: * The "write enable" latch is reset upon power-up. * A WREN instruction must be issued to set the "write enable" latch. * CS must come HIGH at the proper clock count in order to start a write cycle.
Figure 1. Read E2PROM Array Operation Sequence
CS
0 SCK
1
2
3
4
5
6
7
8
9
10
20 21 22 23 24 25 26 27 28 29 30
INSTRUCTION SI
16 BIT ADDRESS 15 14 13 3 2 1 0
DATA OUT HIGH IMPEDANCE SO 7 MSB 6 5 4 3 2 1 0
3063 ILL F03
Figure 2. Read Status Register Operation Sequence
CS
0 SCK
1
2
3
4
5
6
7
8
9
10 11 12 13 14
INSTRUCTION SI
DATA OUT HIGH IMPEDANCE SO 7 MSB 6 5 4 3 2 1 0
3063 ILL F04
5
X25320
Figure 3. Write Enable Latch Sequence
CS
0 SCK
1
2
3
4
5
6
7
SI
SO
HIGH IMPEDANCE
3063 ILL F05
Figure 4. Byte Write Operation Sequence
CS
0 SCK
1
2
3
4
5
6
7
8
9
10
20 21 22 23 24 25 26 27 28 29 30 31
INSTRUCTION SI
16 BIT ADDRESS 15 14 13 3 2 1 0 7 6 5
DATA BYTE 4 3 2 1 0
HIGH IMPEDANCE SO
3063 ILL F06
6
X25320
Figure 5. Page Write Operation Sequence
CS
0 SCK
1
2
3
4
5
6
7
8
9
10
20 21 22 23 24 25 26 27 28 29 30 31
INSTRUCTION SI
16 BIT ADDRESS 15 14 13 3 2 1 0 7 6
DATA BYTE 1 5 4 3 2 1 0
CS
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 SCK
DATA BYTE 2 SI 7 6 5 4 3 2 1 0 7 6
DATA BYTE 3 5 4 3 2 1 0 6
DATA BYTE N 5 4 3 2 1 0
3063 ILL F07
Figure 6. Write Status Register Operation Sequence
CS
0 SCK
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
INSTRUCTION SI 7 6 5
DATA BYTE 4 3 2 1 0
HIGH IMPEDANCE SO
3063 ILL F08
7
X25320
ABSOLUTE MAXIMUM RATINGS* Temperature under Bias .................. -65C to +135C Storage Temperature ....................... -65C to +150C Voltage on any Pin with Respect to VSS ......... -1V to +7V D.C. Output Current ............................................. 5mA Lead Temperature (Soldering, 10 seconds) .............................. 300C *COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and the functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS Temp Commercial Industrial Military Min. 0C -40C -55C Max. +70C +85C +125C
3063 PGM T06.1
Supply Voltage X25320 X25320-2.7
Limits 5V 10% 2.7V to 5.5V
3063 PGM T07.1
D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Limits Symbol
ICC ISB ILI ILO VIL(1) VIH(1) VOL1 VOH1 VOL2 VOH2
Parameter
VCC Supply Current (Active)
Min.
Max.
5
Units
mA A A A V V V V V V
Test Conditions
SCK = VCC x 0.1/VCC x 0.9 @ 2MHz, SO = Open, CS = VSS CS = VCC, VIN = VSS or VCC VIN = VSS to VCC VOUT = VSS to VCC
VCC Supply Current (Standby) 1 Input Leakage Current 10 Output Leakage Current 10 Input LOW Voltage -1 VCC x 0.3 Input HIGH Voltage VCC x 0.7 VCC + 0.5 Output LOW Voltage 0.4 Output HIGH Voltage VCC - 0.8 Output LOW Voltage 0.4 Output HIGH Voltage VCC - 0.3
VCC = 5V, IOL = 3mA VCC = 5V, IOH = -1.6mA VCC = 3V, IOL = 1.5mA VCC = 3V, IOH = -0.4mA
3063 PGM T08.3
POWER-UP TIMING Symbol tPUR(3) tPUW(3) Parameter Power-up to Read Operation Power-up to Write Operation Min. Max. 1 5 Units ms ms
3063 PGM T09
CAPACITANCE TA = +25C, f = 1MHz, VCC = 5V. Symbol COUT(2) CIN(2)
Notes:
Test Output Capacitance (SO) Input Capacitance (SCK, SI, CS, WP, HOLD)
Max. 8 6
Units pF pF
Conditions VOUT = 0V VIN = 0V
3063 PGM T10.1
(1) VIL min. and VIH max. are for reference only and are not tested. (2) This parameter is periodically sampled and not 100% tested. (3) tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated. These parameters are periodically sampled and not 100% tested.
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X25320
EQUIVALENT A.C. LOAD CIRCUIT
5V 1.44K OUTPUT 1.95K 100pF 1.64K OUTPUT 4.63K 100pF 3V
A.C. TEST CONDITIONS Input Pulse Levels VCC x 0.1 to VCC x 0.9 Input Rise and Fall Times 10ns Input and Output Timing Level VCC x 0.5
3063 PGM T11
3063 ILL F09.1
A.C. CHARACTERISTICS (Over recommended operating conditions, unless otherwise specified) Data Input Timing Symbol fSCK tCYC tLEAD tLAG tWH tWL tSU tH tRI(4) tFI(4) tHD tCD tCS tWC(5) Data Output Timing Symbol fSCK tDIS tV tHO tRO(4) tFO(4) tLZ(4) tHZ(4) Parameter Clock Frequency Output Disable Time Output Valid from Clock LOW Output Hold Time Output Rise Time Output Fall Time HOLD HIGH to Output in Low Z HOLD LOW to Output in High Z Min. 0 Max. 2 250 200 100 100 100 100 Units MHz ns ns ns ns ns ns ns
3063 PGM T13.2
Parameter Clock Frequency Cycle Time CS Lead Time CS Lag Time Clock HIGH Time Clock LOW Time Data Setup Time Data Hold Time Data In Rise Time Data In Fall Time HOLD Setup Time HOLD Hold Time CS Deselect Time Write Cycle Time
Min. 0 500 250 250 200 200 50 50
Max. 2
2 2 100 100 2.0 10
Units MHz ns ns ns ns ns ns ns s s ns ns s ms
3063 PGM T12.2
0
Notes: (4) This parameter is periodically sampled and not 100% tested. (5) tWC is the time from the rising edge of CS after a valid write sequence has been sent to the end of the self-timed internal nonvolatile write cycle.
9
X25320
Serial Output Timing
CS tCYC SCK tV SO MSB OUT MSB-1 OUT tHO tWL LSB OUT tDIS tWH tLAG
SI
ADDR LSB IN 3063 ILL F10.1
Serial Input Timing
tCS CS tLEAD SCK tSU SI MSB IN tH tRI tFI LSB IN tLAG
HIGH IMPEDANCE SO
3063 ILL F11
10
X25320
Hold Timing
CS tHD SCK tHZ SO tLZ tCD tHD tCD
SI
HOLD
3063 ILL F12.1
SYMBOL TABLE
WAVEFORM INPUTS Must be steady May change from LOW to HIGH May change from HIGH to LOW Don't Care: Changes Allowed N/A OUTPUTS Will be steady Will change from LOW to HIGH Will change from HIGH to LOW Changing: State Not Known Center Line is High Impedance
11
X25320
PACKAGING INFORMATION
8-LEAD PLASTIC DUAL IN-LINE PACKAGE TYPE P
0.430 (10.92) 0.360 (9.14)
0.260 (6.60) 0.240 (6.10) PIN 1 INDEX PIN 1 0.300 (7.62) REF. 0.060 (1.52) 0.020 (0.51)
HALF SHOULDER WIDTH ON ALL END PINS OPTIONAL SEATING PLANE 0.150 (3.81) 0.125 (3.18)
0.145 (3.68) 0.128 (3.25)
0.025 (0.64) 0.015 (0.38) 0.065 (1.65) 0.045 (1.14) 0.020 (0.51) 0.016 (0.41)
0.110 (2.79) 0.090 (2.29)
0.015 (0.38) MAX.
0.325 (8.25) 0.300 (7.62)
TYP. 0.010 (0.25)
0 15
NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH
3926 FHD F01
12
X25320
PACKAGING INFORMATION
8-LEAD PLASTIC SMALL OUTLINE GULL WING PACKAGE TYPE S
0.150 (3.80) 0.158 (4.00) PIN 1 INDEX
0.228 (5.80) 0.244 (6.20)
PIN 1
0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00)
(4X) 7
0.053 (1.35) 0.069 (1.75)
0.050 (1.27)
0.004 (0.19) 0.010 (0.25)
0.010 (0.25) X 45 0.020 (0.50)
0.050" TYPICAL
0 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250"
0.050" TYPICAL
FOOTPRINT
0.030" TYPICAL 8 PLACES
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
3926 FHD F22.1
13
X25320
PACKAGING INFORMATION
14-LEAD PLASTIC, TSSOP PACKAGE TYPE V
.025 (.65) BSC
.169 (4.3) .252 (6.4) BSC .177 (4.5)
.193 (4.9) .200 (5.1)
.047 (1.20)
.0075 (.19) .0118 (.30)
.002 (.05) .006 (.15)
.010 (.25) Gage Plane 0 - 8 .019 (.50) .029 (.75) Detail A (20X) Seating Plane
.031 (.80) .041 (1.05)
See Detail "A"
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS)
3926 FHD F32
14
X25320
ORDERING INFORMATION X25320 Device P T -V VCC Limits Blank = 5V 10% 2.7 = 2.7V to 5.5V Temperature Range Blank = Commercial = 0C to +70C I = Industrial = -40C to +85C M = Military = -55C to +125C Package P = 8-Lead Plastic DIP S = 8-Lead SOIC V = 14-Lead TSSOP Part Mark Convention X25320 X Blank = 8-Lead SOIC P = 8-Lead Plastic DIP V = 14-Lead TSSOP
X Blank = 5V 10%, 0C to +70C I = 5V 10%, -40C to +85C F = 2.7V to 5.5V, 0C to +70C G = 2.7V to 5.5V, -40C to +85C
LIMITED WARRANTY
Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, licenses are implied. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829, 482; 4,874, 967; 4,883, 976. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurence. Xicor's products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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