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CAT28LV64
64K-Bit CMOS PARALLEL EEPROM FEATURES
3.0V to 3.6 V Supply Read access times: CMOS and TTL compatible I/O Automatic page write operation:
H
GEN FR ALO
EE
LE
A D F R E ETM
- 150/200/250ns
Low power CMOS dissipation:
- 1 to 32 bytes in 5ms - Page load timer
End of write detection:
- Active: 8 mA max. - Standby: 100 A max.
Simple write operation:
- Toggle bit - DATA polling
Hardware and software write protection 100,000 program/erase cycles 100 year data retention
- On-chip address and data latches - Self-timed write cycle with auto-clear
Fast write cycle time:
- 5ms max.
Commercial, industrial and automotive
temperature ranges
DESCRIPTION
The CAT28LV64 is a low voltage, low power, CMOS parallel EEPROM organized as 8K x 8-bits. It requires a simple interface for in-system programming. On-chip address and data latches, self-timed write cycle with autoclear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bit signal the start and end of the selftimed write cycle. Additionally, the CAT28LV64 features hardware and software write protection. The CAT28LV64 is manufactured using Catalyst's advanced CMOS floating gate technology. It is designed to endure 100,000 program/erase cycles and has a data retention of 100 years. The device is available in JEDEC approved 28-pin DIP, 28-pin TSOP, 28-pin SOIC or 32pin PLCC packages.
BLOCK DIAGRAM
A5-A12 ADDR. BUFFER & LATCHES INADVERTENT WRITE PROTECTION ROW DECODER 8,192 x 8 E2PROM ARRAY 32 BYTE PAGE REGISTER
VCC
HIGH VOLTAGE GENERATOR
CE OE WE
CONTROL LOGIC I/O BUFFERS TIMER DATA POLLING AND TOGGLE BIT COLUMN DECODER
I/O0-I/O7
A0-A4
ADDR. BUFFER & LATCHES
(c) 2004 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. 1010, Rev. D
CAT28LV64
PIN CONFIGURATION
DIP Package (P, L)
NC A12 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC WE NC A8 A9 A11 OE A10 CE I/O7 I/O6 I/O5 I/O4 I/O3
SOIC Package (J, W) (K, X)
NC A12 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC WE NC A8 A9 A11 OE A10 CE I/O7 I/O6 I/O5 I/O4 I/O3
PLCC Package (N, G)
A7 A12 NC NC VCC WE NC
OE A11 A9 A8 NC WE VCC NC A12 A7 A6 A5 A4 A3
TSOP Top View (8mm x 13.4mm) (T13, H13)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 A10 CE I/O7 I/O6 I/O5 I/O4 I/O3 GND I/O2 I/O1 I/O0 A0 A1 A2
4 3 2 1 32 31 30 A6 A5 A4 A3 A2 A1 A0 NC I/O0 5 6 7 8 9 10 29 28 27 26 25 24 A8 A9 A11 NC OE A10 CE I/O7 I/O6
TOP VIEW
11 23 12 22 13 21 14 15 16 17 18 19 20
I/O1 I/O2 VSS NC I/O3 I/O4 I/O5
PIN FUNCTIONS
Pin Name A0-A12 I/O0-I/O7 CE OE Function Address Inputs Data Inputs/Outputs Chip Enable Output Enable Pin Name WE VCC VSS NC Function Write Enable 3.0 to 3.6 V Supply Ground No Connect
Doc. No. 1010, Rev. D
2
CAT28LV64
ABSOLUTE MAXIMUM RATINGS*
Temperature Under Bias ................. -55C to +125C Storage Temperature ....................... -65C to +150C Voltage on Any Pin with Respect to Ground(2) ........... -2.0V to +VCC + 2.0V VCC with Respect to Ground ............... -2.0V to +7.0V Package Power Dissipation Capability (Ta = 25C) ................................... 1.0W Lead Soldering Temperature (10 secs) ............ 300C Output Short Circuit Current(3) ........................ 100 mA RELIABILITY CHARACTERISTICS Symbol NEND
(1)
*COMMENT
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Parameter Endurance Data Retention ESD Susceptibility Latch-Up
Min. 105 100 2000 100
Max.
Units Cycles/Byte Years Volts mA
Test Method MIL-STD-883, Test Method 1033 MIL-STD-883, Test Method 1008 MIL-STD-883, Test Method 3015 JEDEC Standard 17
TDR(1) VZAP
(1)
ILTH(1)(4)
MODE SELECTION Mode Read Byte Write (WE Controlled) Byte Write (CE Controlled) Standby, and Write Inhibit Read and Write Inhibit H X CE L L L X H WE H OE L H H X H I/O DOUT DIN DIN High-Z High-Z Power ACTIVE ACTIVE ACTIVE STANDBY ACTIVE
CAPACITANCE TA = 25C, f = 1.0 MHz Symbol CI/O
(1)
Test Input/Output Capacitance Input Capacitance
Max. 10 6
Units pF pF
Conditions VI/O = 0V VIN = 0V
CIN(1)
Note: (1) This parameter is tested initially and after a design or process change that affects the parameter. (2) The minimum DC input voltage is -0.5V. During transitions, inputs may undershoot to -2.0V for periods of less than 20 ns. Maximum DC voltage on output pins is VCC +0.5V, which may overshoot to VCC +2.0V for periods of less than 20 ns. (3) Output shorted for no more than one second. No more than one output shorted at a time. (4) Latch-up protection is provided for stresses up to 100mA on address and data pins from -1V to VCC +1V.
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Doc. No. 1010, Rev. D
CAT28LV64
D.C. OPERATING CHARACTERISTICS Vcc = 3.0V to 3.6V, unless otherwise specified.
Limits Symbol ICC ISBC(3) ILI ILO VIH(3) VIL VOH VOL VWI Parameter VCC Current (Operating, TTL) VCC Current (Standby, CMOS) Input Leakage Current Output Leakage Current High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Write Inhibit Voltage 2 -1 -5 2 -0.3 2 0.3 Min. Typ. Max. 8 100 1 5 VCC +0.3 0.6 Units mA A A A V V V V V IOH = -100A IOL = 1.0mA Test Conditions CE = OE = VIL, f = 1/tRC min, All I/O's Open CE = VIHC, All I/O's Open VIN = GND to VCC VOUT = GND to VCC, CE = VIH
A.C. CHARACTERISTICS, Read Cycle Vcc = 3.0V to 3.6V, unless otherwise specified. 28LV64-15 Symbol tRC tCE tAA tOE tLZ(1) tOLZ(1) tHZ(1)(2) tOHZ(1)(2) tOH(1) Parameter Read Cycle Time CE Access Time Address Access Time OEAccess Time CE Low to Active Output OE Low to Active Output CE High to High-Z Output OE High to High-Z Output Output Hold from Address Change 0 0 0 50 50 0 Min. 150 150 150 70 0 0 50 50 0 0 55 55 Max. 28LV64-20 Min. 200 200 200 80 0 Max. 28LV64-25 Min. 250 250 250 100 Max. Units ns ns ns ns ns ns ns ns ns
Note: (1) This parameter is tested initially and after a design or process change that affects the parameter. (2) Output floating (High-Z) is defined as the state when the external data line is no longer driven by the output buffer. (3) VIHC = VCC -0.3V to VCC +0.3V.
Doc. No. 1010, Rev. D
4
CAT28LV64
Figure 1. A.C. Testing Input/Output Waveform(4)
VCC - 0.3 V INPUT PULSE LEVELS 0.0 V 0.6 V 2.0 V REFERENCE POINTS
Figure 2. A.C. Testing Load Circuit (example)
Vcc 1.8 K DEVICE UNDER TEST OUTPUT 1. 3K CL= 100 pF
CL INCLUDES JIG CAPACITANCE
A.C. CHARACTERISTICS, Write Cycle Vcc = 3.0V to 3.6V, unless otherwise specified. 28LV64-15 Symbol tWC tAS tAH tCS tCH tCW(2) tOES tOEH tWP(2) tDS tDH tINIT(1) tBLC(1)(3) Parameter Write Cycle Time Address Setup Time0 Address Hold Time CE Setup Time CE Hold Time CE Pulse Time OE Setup Time OE Hold Time WE Pulse Width Data Setup Time Data Hold Time Write Inhibit Period After Power-up Byte Load Cycle Time 0 100 0 0 110 0 0 110 60 0 5 0.05 10 100 Min Max 5 0 100 0 0 150 10 10 150 100 0 5 0.1 10 100 28LV64-20 Min Max 5 0 100 0 0 150 10 10 150 100 0 5 0.1 10 100 28LV64-25 Min Max 5 Units ms ns ns ns ns ns ns ns ns ns ns ms s
Note: (1) This parameter is tested initially and after a design or process change that affects the parameter. (2) A write pulse of less than 20ns duration will not initiate a write cycle. (3) A timer of duration tBLC max. begins with every LOW to HIGH transition of WE. If allowed to time out, a page or byte write will begin; however a transition from HIGH to LOW within tBLC max. stops the timer. (4) Input rise and fall times (10% and 90%) < 10 ns.
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Doc. No. 1010, Rev. D
CAT28LV64
DEVICE OPERATION
Read Data stored in the CAT28LV64 is transferred to the data bus when WE is held high, and both OE and CE are held low. The data bus is set to a high impedance state when either CE or OE goes high. This 2-line control architecture can be used to eliminate bus contention in a system environment.
Byte Write A write cycle is executed when both CE and WE are low, and OE is high. Write cycles can be initiated using either WE or CE, with the address input being latched on the falling edge of WE or CE, whichever occurs last. Data, conversely, is latched on the rising edge of WE or CE, whichever occurs first. Once initiated, a byte write cycle automatically erases the addressed byte and the new data is written within 5 ms.
Figure 3. Read Cycle
tRC ADDRESS tCE CE tOE OE VIH WE tLZ tOLZ DATA OUT HIGH-Z tOH DATA VALID tAA tOHZ tHZ DATA VALID
Figure 4. Byte Write Cycle [WE Controlled]
tWC ADDRESS tAS tCS CE tAH tCH
OE tOES WE tBLC DATA OUT HIGH-Z tWP tOEH
DATA IN
DATA VALID tDS tDH
Doc. No. 1010, Rev. D Doc. No. 1010, Rev. A
6
CAT28LV64
Page Write The page write mode of the CAT28LV64 (essentially an extended BYTE WRITE mode) allows from 1 to 32 bytes of data to be programmed within a single EEPROM write cycle. This effectively reduces the byte-write time by a factor of 32. Following an initial WRITE operation (WE pulsed low, for tWP, and then high) the page write mode can begin by issuing sequential WE pulses, which load the address and data bytes into a 32 byte temporary buffer. The page address where data is to be written, specified by bits A5 to A12, is latched on the last falling edge of WE. Each byte within the page is defined by address bits A0 to A4 Figure 5. Byte Write Cycle [CE Controlled]
tWC ADDRESS tAS tAH tCW CE tOEH OE tCS WE HIGH-Z DATA OUT tOES tCH tBLC
(which can be loaded in any order) during the first and subsequent write cycles. Each successive byte load cycle must begin within tBLC MAX of the rising edge of the preceding WE pulse. There is no page write window limitation as long as WE is pulsed low within tBLC MAX. Upon completion of the page write sequence, WE must stay high a minimum of tBLC MAX for the internal automatic program cycle to commence. This programming cycle consists of an erase cycle, which erases any data that existed in each addressed cell, and a write cycle, which writes new data back into the cell. A page write will only write data to the locations that were addressed and will not rewrite the entire page.
DATA IN
DATA VALID tDS tDH
Figure 6. Page Mode Write Cycle
OE
CE t WP WE t BLC
ADDRESS t WC I/O BYTE 0 BYTE 1 BYTE 2 BYTE n BYTE n+1 LAST BYTE BYTE n+2
Doc. No. 1010, Rev. D Doc. No. 1010, Rev. A
7
CAT28LV64
DATA Polling DATA polling is provided to indicate the completion of write cycle. Once a byte write or page write cycle is initiated, attempting to read the last byte written will output the complement of that data on I/O7 (I/O0-I/O6 are indeterminate) until the programming cycle is complete. Upon completion of the self-timed write cycle, all I/O's will output true data during a read cycle. Toggle Bit In addition to the DATA Polling feature, the device offers an additional method for determining the completion of a write cycle. While a write cycle is in progress, reading data from the device will result in I/O6 toggling between one and zero. However, once the write is complete, I/O6 stops toggling and valid data can be read from the device.
Figure 7. DATA Polling
ADDRESS
CE
WE tOEH OE tWC I/O7 DIN = X DOUT = X DOUT = X tOE tOES
Figure 8. Toggle Bit
WE
CE tOEH OE tOE tOES
I/O6
(1) tWC
(1)
Note: (1) Beginning and ending state of I/O6 is indeterminate.
Doc. No. 1010, Rev. D
8
CAT28LV64
HARDWARE DATA PROTECTION The following is a list of hardware data protection features that are incorporated into the CAT28LV64. (1) VCC sense provides for write protection when VCC falls below 2.0V min. (2) A power on delay mechanism, tINIT (see AC characteristics), provides a 5 to 10 ms delay before a write sequence, after VCC has reached 2.40V min. (3) Write inhibit is activated by holding any one of OE low, CE high or WE high.
(4) Noise pulses of less than 20 ns on the WE or CE inputs will not result in a write cycle. SOFTWARE DATA PROTECTION The CAT28LV64 features a software controlled data protection scheme which, once enabled, requires a data algorithm to be issued to the device before a write can be performed. The device is shipped from Catalyst with the software protection NOT ENABLED (the CAT28LV64 is in the standard operating mode).
Figure 9. Write Sequence for Activating Software Data Protection
Figure 10. Write Sequence for Deactivating Software Data Protection
WRITE DATA: ADDRESS: AA 1555
WRITE DATA: ADDRESS:
AA 1555
WRITE DATA: ADDRESS:
55 0AAA
WRITE DATA: ADDRESS:
55 0AAA
WRITE DATA: ADDRESS:
A0 1555
WRITE DATA: ADDRESS:
80 1555
SOFTWARE DATA (1) PROTECTION ACTIVATED
WRITE DATA: ADDRESS:
AA 1555
WRITE DATA:
XX
WRITE DATA: ADDRESS:
55 0AAA
TO ANY ADDRESS
WRITE LAST BYTE TO LAST ADDRESS
WRITE DATA: ADDRESS:
20 1555
28LV64 F12
Note: (1) Write protection is activated at this point whether or not any more writes are completed. Writing to addresses must occur within tBLC Max., after SDP activation.
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Doc. No. 1010, Rev. D
CAT28LV64
To activate the software data protection, the device must be sent three write commands to specific addresses with specific data (Figure 9). This sequence of commands (along with subsequent writes) must adhere to the page write timing specifications (Figure 11). Once this is done, all subsequent byte or page writes to the device must be preceded by this same set of write commands. The data protection mechanism is activated until a deactivate sequence is issued regardless of power on/off transitions. This gives the user added inadvertent write protection on power-up in addition to the hardware protection provided. Figure 11. Software Data Protection Timing
DATA ADDRESS CE tWP WE tBLC AA 1555 55 0AAA A0 1555 BYTE OR PAGE WRITES ENABLED tWC
To allow the user the ability to program the device with an EEPROM programmer (or for testing purposes) there is a software command sequence for deactivating the data protection. The six step algorithm (Figure 10) will reset the internal protection circuitry, and the device will return to standard operating mode (Figure 12 provides reset timing). After the sixth byte of this reset sequence has been issued, standard byte or page writing can commence.
Figure 12. Resetting Software Data Protection Timing
DATA ADDRESS CE DEVICE UNPROTECTED WE AA 1555 55 0AAA 80 1555 AA 1555 55 0AAA 20 1555 tWC SDP RESET
Doc. No. 1010, Rev. D
10
CAT28LV64
ORDERING INFORMATION
Prefix CAT Device # 28LV64 Suffix N I -25 T
Optional Company ID
Product Number
Temperature Range Blank = Commercial (0C to +70C) I = Industrial (-40C to +85C) A = Automotive (-40C to +105C)* Package P: PDIP J: SOIC (JEDEC) K: SOIC (EIAJ) N: PLCC T13: TSOP (8mmx13.4mm) L: PDIP (Lead free, Halogen free) W: SOIC (JEDEC) (Lead free, Halogen free) X: SOIC (EIAJ) (Lead free, Halogen free) G: PLCC (Lead free, Halogen free) H13: TSOP (8mmx13.4mm) (Lead free, Halogen free)
Tape & Reel
Speed 15: 150ns 20: 200ns 25: 250ns
* -40C to +125C is available upon request
Notes: (1) The device used in the above example is a CAT28LV64NI-25T (PLCC, Industrial temperature, 250 ns Access Time, Tape & Reel).
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Doc. No. 1010, Rev. D
REVISION HISTORY
Date 3/29/04 04/20/04 Revision Comments C D Added Green packages in all areas Delete data sheet designation Update Ordering Information Update Revision History Update Rev Number
Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP TM AE2 TM
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents issued to Catalyst Semiconductor contact the Company's corporate office at 408.542.1000.
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Publication #: Revison: Issue date:
1010 D 04/20/04

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