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CAT28C256 256 kb Parallel EEPROM
Description
The CAT28C256 is a fast, low power, 5 V-only CMOS Parallel EEPROM organized as 32K x 8-bits. It requires a simple interface for in-system programming. On-chip address and data latches, self-timed write cycle with auto-clear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bits signal the start and end of the self-timed write cycle. Additionally, the CAT28C256 features hardware and software write protection. The CAT28C256 is manufactured using ON Semiconductor'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 or 32-pin PLCC packages.
Features
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TSOP-28 T13, H13 SUFFIX CASE 318AE
* Fast Read Access Times: 120/150 ns * Low Power CMOS Dissipation: * * * * * * * * *
- Active: 25 mA Max. - Standby: 150 mA Max. Simple Write Operation: - On-chip Address and Data Latches - Self-timed Write Cycle with Auto-clear Fast Write Cycle Time: - 5 ms Max. CMOS and TTL Compatible I/O Hardware and Software Write Protection Automatic Page Write Operation: - 1 to 64 Bytes in 5 ms - Page Load Timer End of Write Detection: - Toggle Bit - DATA Polling 100,000 Program/Erase Cycles 100 Year Data Retention Commercial, Industrial and Automotive Temperature Ranges
PDIP-28 P, L SUFFIX CASE 646AE
PLCC-32 N, G SUFFIX CASE 776AK
PIN FUNCTION
Pin Name A0-A14 I/O0-I/O7 CE OE WE VCC VSS NC Function Address Inputs Data Inputs/Outputs Chip Enable Output Enable Write Enable 5 V Supply Ground No Connect
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 14 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2009
December, 2009 - Rev. 6
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Publication Order Number: CAT28C256/D
CAT28C256
PIN CONFIGURATION
DIP Package (P, L) A14 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 A13 A8 A9 A11 OE A10 CE I/O7 I/O6 I/O5 I/O4 I/O3 PLCC Package (N, G) A7 A12 A14 NC VCC WE A13 OE A11 A9 A8 A13 WE VCC A14 A12 A7 A6 A5 A4 A3 TSOP Package (8 mm X 13.4 mm) (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
A6 A5 A4 A3 A2 A1 A0 NC I/O0
4 3 2 1 32 31 30 5 29 6 28 7 27 8 26 9 25 10 24 11 23 12 22 13 21 14 1516 171819 20 I/O1 I/O2 VSS NC I/O3 I/O4 I/O5
A8 A9 A11 NC OE A10 CE I/O7 I/O6
(Top Views)
A6-A14
ADDR. BUFFER & LATCHES INADVERTENT WRITE PROTECTION
ROW DECODER
32,768 x 8 EEPROM ARRAY
VCC
HIGH VOLTAGE GENERATOR 64 BYTE PAGE REGISTER
CE OE WE
CONTROL LOGIC DATA POLLING AND TOGGLE BIT COLUMN DECODER
I/O BUFFERS
TIMER ADDR. BUFFER & LATCHES
I/O0-I/O7
A0-A5
Figure 1. Block Diagram
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CAT28C256
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters Temperature Under Bias Storage Temperature Voltage on Any Pin with Respect to Ground (Note 1) VCC with Respect to Ground Package Power Dissipation Capability (TA = 25C) Lead Soldering Temperature (10 secs) Output Short Circuit Current (Note 2) Ratings -55 to +125 -65 to +150 -2.0 V to +VCC + 2.0 V -2.0 to +7.0 1.0 300 100 Units C C V V W C mA
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. The minimum DC input voltage is -0.5 V. During transitions, inputs may undershoot to -2.0 V for periods of less than 20 ns. Maximum DC voltage on output pins is VCC + 0.5 V, which may overshoot to VCC + 2.0 V for periods of less than 20 ns. 2. Output shorted for no more than one second. No more than one output shorted at a time.
Table 2. RELIABILITY CHARACTERISTICS (Note 3)
Symbol NEND TDR VZAP ILTH (Note 4) Parameter Endurance Data Retention ESD Susceptibility Latch-Up Test Method MIL-STD-883, Test Method 1033 MIL-STD-883, Test Method 1008 MIL-STD-883, Test Method 3015 JEDEC Standard 17 Min 100,000 100 2,000 100 Max Units Cycles/Byte Years V mA
3. These parameters are tested initially and after a design or process change that affects the parameters. 4. Latch-up protection is provided for stresses up to 100 mA on address and data pins from -1 V to VCC + 1 V.
Table 3. D.C. OPERATING CHARACTERISTICS (VCC = 5 V 10%, unless otherwise specified.)
Limits Symbol ICC ICCC (Note 5) ISB ISBC (Note 6) ILI ILO VIH (Note 6) VIL (Note 5) VOH VOL VWI Parameter VCC Current (Operating, TTL) VCC Current (Operating, CMOS) VCC Current (Standby, 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 IOH = -400 mA IOL = 2.1 mA 3.5 Test Conditions CE = OE = VIL, f = 8 MHz, All I/O's Open CE = OE = VILC, f = 8 MHz, All I/O's Open CE = VIH, All I/O's Open CE = VIHC, All I/O's Open VIN = GND to VCC VOUT = GND to VCC, CE = VIH -10 -10 2 -0.3 2.4 0.4 Min Typ Max 30 25 1 150 10 10 VCC + 0.3 0.8 Units mA mA mA mA mA mA V V V V V
5. VILC = -0.3 V to +0.3 V. 6. VIHC = VCC -0.3 V to VCC + 0.3 V.
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CAT28C256
Table 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
Table 5. CAPACITANCE (TA = 25C, f = 1.0 MHz, VCC = 5 V)
Symbol CI/O (Note 7) CIN (Note 7) Test Input/Output Capacitance Input Capacitance Max 10 6 Conditions VI/O = 0 V VIN = 0 V Units pF pF
7. This parameter is tested initially and after a design or process change that affects the parameter.
Table 6. A.C. CHARACTERISTICS, READ CYCLE (VCC = 5 V 10%, unless otherwise specified.)
28C256-12 Symbol tRC tCE tAA tOE tLZ (Note 8) tOLZ (Note 8) tHZ (Notes 8, 9) tOHZ (Notes 8, 9) tOH (Note 8) Read Cycle Time CE Access Time Address Access Time OE Access 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 Parameter Min 120 120 120 50 0 0 50 50 Max 28C256-15 Min 150 150 150 70 Max Units ns ns ns ns ns ns ns ns ns
8. This parameter is tested initially and after a design or process change that affects the parameter. 9. Output floating (High-Z) is defined as the state when the external data line is no longer driven by the output buffer.
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CAT28C256
Table 7. A.C. CHARACTERISTICS, WRITE CYCLE (VCC = 5 V 10%, unless otherwise specified.)
28C256-12 Symbol tWC tAS tAH tCS tCH tCW (Note 10) tOES tOEH tWP (Note 10) tDS tDH tINIT (Note 11) tBLC (Notes 11, 12) Write Cycle Time Address Setup Time 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 50 0 0 100 0 0 100 50 10 5 0.1 10 100 Parameter Min Max 5 0 50 0 0 100 0 0 100 50 10 5 0.1 10 100 28C256-15 Min Max 5 Units ms ns ns ns ns ns ns ns ns ns ns ms ms
10. A write pulse of less than 20 ns duration will not initiate a write cycle. 11. This parameter is tested initially and after a design or process change that affects the parameter. 12. 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. VCC - 0.3 V INPUT PULSE LEVELS 0.0 V 2.0 V 0.8 V
REFERENCE POINTS
Figure 2. A.C. Testing Input/Output Waveform (Note 13)
13. Input rise and fall times (10% and 90%) < 10 ns. 1.3 V 1N914
3.3 K DEVICE UNDER TEST OUT CL = 100 pF
CL INCLUDES JIG CAPACITANCE
Figure 3. A.C. Testing Load Circuit (example)
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CAT28C256
DEVICE OPERATION
Read Byte Write
Data stored in the CAT28C256 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.
tRC ADDRESS tCE
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.
CE
OE
tOE
WE
VIH tLZ
tOLZ tAA tOH DATA VALID tOHZ tHZ DATA VALID
DATA OUT
HIGH-Z
Figure 4. Read Cycle
tWC ADDRESS tAS tCS CE tAH tCH
OE tOES WE tBLC DATA OUT HIGH-Z tWP tOEH
DATA IN
DATA VALID tDS tDH
Figure 5. Byte Write Cycle [WE Controlled]
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CAT28C256
Page Write
The page write mode of the CAT28C256 (essentially an extended BYTE WRITE mode) allows from 1 to 64 bytes of data to be programmed within a single EEPROM write cycle. This effectively reduces the byte-write time by a factor of 64. 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 64 byte temporary buffer. The page address where data is to be written, specified by bits A6 to A14, is latched on the last falling edge of WE. Each byte within the page is defined by address bits A0 to A5 (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.
tWC
ADDRESS tAS tAH tCW CE tOEH OE tCS WE HIGH-Z DATA OUT tOES tCH tBLC
DATA IN
DATA VALID tDS tDH
Figure 6. Byte Write Cycle [CE Controlled]
OE
CE tWP WE tBLC
ADDRESS tWC I/O BYTE 0 BYTE 1 BYTE 2 BYTE n BYTE n+1 LAST BYTE BYTE n+2
Figure 7. Page Mode Write Cycle
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CAT28C256
DATA Polling Toggle Bit
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.
ADDRESS
In addition to the DATA Polling feature of the CAT28C256, 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.
CE
WE tOEH OE tWC I/O7 DIN = X DOUT = X DOUT = X tOE tOES
Figure 8. DATA Polling
WE
CE tOEH OE tOE tOES
I/O6
(Note 14) tWC
(Note 14)
Figure 9. Toggle Bit
14. Beginning and ending state of I/O6 is indeterminate.
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CAT28C256
Hardware Data Protection
The following is a list of hardware data protection features that are incorporated into the CAT28C256. 1. VCC sense provides for write protection when VCC falls below 3.5 V 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 3.5 V min. 3. Write inhibit is activated by holding any one of OE low, CE high or WE high.
WRITE DATA: ADDRESS: AA 5555
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 CAT28C256 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 ON Semiconductor with the software protection NOT ENABLED (the CAT28C256 is in the standard operating mode).
WRITE DATA: ADDRESS:
AA 5555
WRITE DATA: ADDRESS:
55 2AAA
WRITE DATA: ADDRESS:
55 2AAA
WRITE DATA: ADDRESS:
A0 5555
WRITE DATA: ADDRESS:
80 5555
SOFTWARE DATA PROTECTION ACTIVATED (Note 15)
WRITE DATA: ADDRESS:
AA 5555
WRITE DATA:
XX
WRITE DATA: ADDRESS:
55 2AAA
TO ANY ADDRESS
WRITE LAST BYTE TO LAST ADDRESS
WRITE DATA: ADDRESS:
20 5555
Figure 10. Write Sequence for Activating Software Data Protection
Figure 11. Write Sequence for Deactivating Software Data Protection
15. 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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CAT28C256
To activate the software data protection, the device must be sent three write commands to specific addresses with specific data (Figure 10). This sequence of commands (along with subsequent writes) must adhere to the page write timing specifications (Figure 12). 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.
DATA ADDRESS CE tWP WE tBLC AA 5555 55 2AAA
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 11) will reset the internal protection circuitry, and the device will return to standard operating mode (Figure 13 provides reset timing). After the sixth byte of this reset sequence has been issued, standard byte or page writing can commence.
A0 5555
tWC BYTE OR PAGE WRITES ENABLED
Figure 12. Software Data Protection Timing
DATA ADDRESS CE
AA 5555
55 2AAA
80 5555
AA 5555
55 2AAA
20 5555
tWC
SDP RESET
DEVICE UNPROTECTED WE
Figure 13. Resetting Software Data Protection Timing
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CAT28C256
PACKAGE DIMENSIONS
PLCC 32 CASE 776AK-01 ISSUE O
PIN#1 IDENTIFICATION
E1
E
E2
D1 D TOP VIEW A3 END VIEW
A2
SYMBOL b1 A2 A3 b b1 b D2 SIDE VIEW Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-016. e D D1 D2 E E1 E2 e
MIN 0.38 2.54 0.33 0.66 12.32 11.36 9.56 14.86 13.90 12.10
NOM
MAX
2.80 0.54 0.82 12.57 11.50 11.32 15.11 14.04 13.86 1.27 BSC
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CAT28C256
PACKAGE DIMENSIONS
TSOP 28, 8x13.4 CASE 318AE-01 ISSUE O
D1 A PIN 1
b E1
e
D
A1 A2
TOP VIEW q1 L2
END VIEW
c
SYMBOL A
MIN 1.00 0.05 0.90 0.17 0.10 13.20 11.70 7.90 0.30 0.675
NOM 1.10 1.00 0.22 0.15 13.40 11.80 8.00 0.55 BSC 0.50 0.25 BSC
MAX 1.20 0.15 1.05 0.27 0.20 13.60 11.90 8.10 0.70
q SIDE VIEW
A1 L L1 A2 b c D D1 E e L L1 Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-183. L2
1
0 10
3 12
5 16
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CAT28C256
PACKAGE DIMENSIONS
PDIP-28, 600 mils CASE 646AE-01 ISSUE A
SYMBOL A A1 A2 E1 E b b1 c D D E E1 e TOP VIEW eB L 15.24 2.93 0.39 3.18 0.36 0.77 0.21 35.10 15.24 12.32 2.54 BSC 17.78 5.08 4.95 0.55 1.77 0.38 39.70 15.87 14.73 MIN NOM MAX 6.35
A2
A
c A1 b1 e b L eB
SIDE VIEW Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-011.
END VIEW
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CAT28C256
Example of Ordering Information (Note 16)
Prefix CAT Device # 28C256 Suffix N I - 15 T
Company ID (Optional)
Product Number 28C256
Temperature Range Blank = Commercial (0C to +70C) I = Industrial (-40C to +85C) A = Automotive (-40C to +105C) (Note 18) Speed
Tape & Reel (Note 20) T: Tape & Reel
Package P: PDIP (Note 17) N: PLCC (Note 17) T13: TSOP (8 mm x 13.4 mm) (Note 17) L: PDIP (Lead Free, Halogen Free) G: PLCC (Lead Free, Halogen Free) H13: TSOP (8 mm x 13.4 mm) (Lead Free, Halogen Free) (Note 19)
12: 120 ns 15: 150 ns
16. The device used in the above example is a CAT28C256NI-15T (PLCC, Industrial Temperature, 150 ns Access Time, Tape & Reel). 17. Solder-plate (tin-lead) packages, contact Factory for availability. 18. -40C to +125C is available upon request. 19. For the TSOP package (H13), the orderable part number does not contain a hyphen, example: CAT28C256H13I15T. 20. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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CAT28C256/D

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