1 Mb Boot Block Flash Memory

CAT28F001
1 Megabit CMOS Boot Block
Flash Memory
Licensed Intel
second source
FEATURES
■ Deep Powerdown Mode
■ Fast Read Access Time: 90/120 ns
■ On-Chip Address and Data Latches
■ Blocked Architecture
■
■
■
■
■
■
■
■
— One 8 KB Boot Block w/ Lock Out
• Top or Bottom Locations
— Two 4 KB Parameter Blocks
— One 112 KB Main Block
Low Power CMOS Operation
12.0V ± 5% Programming and Erase Voltage
Automated Program & Erase Algorithms
High Speed Programming
Commercial, Industrial and Automotive
Temperature Ranges
■
■
■
— 0.05 µA ICC Typical
— 0.8 µA IPP Typical
Hardware Data Protection
Electronic Signature
100,000 Program/Erase Cycles and 10 Year
Data Retention
JEDEC Standard Pinouts:
— 32 pin DIP
— 32 pin PLCC
— 32 pin TSOP
Reset/Deep Power Down Mode
"Green" Package Options Available
DESCRIPTION
The CAT28F001 is a high speed 128K X 8 bit electrically
erasable and reprogrammable Flash memory ideally
suited for applications requiring in-system or after sale
code updates.
The CAT28F001 is designed with a signature mode
which allows the user to identify the IC manufacturer and
device type. The CAT28F001 is also designed with onChip Address Latches, Data Latches, Programming and
Erase Algorithms.
The CAT28F001 has a blocked architecture with one 8
KB Boot Block, two 4 KB Parameter Blocks and one 112
KB Main Block. The Boot Block section can be at the top
or bottom of the memory map and includes a reprogramming write lock out feature to guarantee data integrity. It
is designed to contain secure code which will bring up
the system minimally and download code to other locations of CAT28F001.
The CAT28F001 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 10 years. The device is available in JEDEC
approved 32-pin plastic DIP, PLCC or TSOP packages.
BLOCK DIAGRAM
I/O0–I/O7
ADDRESS
COUNTER
I/O BUFFERS
WRITE STATE
MACHINE
ERASE VOLTAGE
SWITCH
STATUS
REGISTER
RP
WE
PROGRAM VOLTAGE
SWITCH
CE, OE LOGIC
DATA
LATCH
SENSE
AMP
COMPARATOR
COMMAND
REGISTER
A0–A16
VOLTAGE VERIFY
SWITCH
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
ADDRESS LATCH
CE
OE
Y-GATING
Y-DECODER
X-DECODER
1
8K-BYTE BOOT BLOCK
4K-BYTE PARAMETER BLOCK
4K-BYTE PARAMETER BLOCK
112K-BYTE MAIN BLOCK
Doc. No. MD-1078, Rev. K
CAT28F001
PIN CONFIGURATION
I/O6
I/O5
I/O4
I/O3
RP
5
6
7
29
28
27
A4
A3
A2
A1
8
9
10
11
26
25
24
23
A0
I/O0
12
A14
A13
A8
A9
A11
OE
A10
22 F02CE
28F001
13
21
14 15 16 17 18 19 20
I/O7
I/O6
20
19
18
17
4 3 2 1 32 31 30
A7
A6
A5
I/O4
I/O5
13
14
15
16
VCC
WE
RP
A14
A13
A8
A9
A11
OE
A10
CE
I/O7
VSS
I/O3
I/O0
I/O1
I/O2
VSS
32
31
30
29
28
27
26
25
24
23
22
21
A12
A15
1
2
3
4
5
6
7
8
9
10
11
12
I/O1
I/O2
VPP
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
A16
VPP
VCC
WE
PLCC Package (N, G)
DIP Package (L)
TSOP Package (Standard Pinout) (T, H)
A11
A9
A8
A13
A14
RP
WE
VCC
VPP
A16
A15
A12
A7
A6
A5
A4
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
VSS
I/O2
I/O1
I/O0
A0
A1
A2
A3
PIN FUNCTIONS
Pin Name
Type
Function
A0–A16
Input
Address Inputs for
memory addressing
I/O0–I/O7
I/O
Data Input/Output
CE
Input
Chip Enable
OE
Input
Output Enable
WE
Input
Write Enable
VCC
Voltage Supply
VSS
Ground
VPP
Program/Erase
Voltage Supply
RP
Doc. No. MD-1078, Rev. K
Input
Power Down
2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
ABSOLUTE MAXIMUM RATINGS*
*COMMENT
Temperature Under Bias ................... –55°C to +95°C
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.
Storage Temperature ....................... –65°C to +150°C
Voltage on Any Pin with
Respect to Ground(1) ........... –2.0V to +VCC + 2.0V
(Except A9, RP, OE, VCC and VPP)
Voltage on Pin A9, RP AND OE with
Respect to Ground(1) ................... –2.0V to +13.5V
VPP with Respect to Ground
during Program/Erase(1) .............. –2.0V to +14.0V
VCC with Respect to Ground(1) ............ –2.0V to +7.0V
Package Power Dissipation
Capability (TA = 25°C) .................................. 1.0 W
Lead Soldering Temperature (10 secs) ............ 300°C
Output Short Circuit Current(2) ........................ 100 mA
RELIABILITY CHARACTERISTICS
Symbol
NEND
(3)
Parameter
Endurance
Min.
Max.
Units
Test Method
100K
Cycles/Byte
MIL-STD-883, Test Method 1033
10
Years
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 3015
TDR(3)
Data Retention
VZAP(3)
ESD Susceptibility
2000
Volts
ILTH(3)(4)
Latch-Up
100
mA
JEDEC Standard 17
CAPACITANCE TA = 25°C, f = 1.0 MHz
Limits
Symbol
CIN(3)
COUT
(3)
CVPP(3)
Test
Min
Max.
Units
Conditions
Input Pin Capacitance
8
pF
VIN = 0V
Output Pin Capacitance
12
pF
VOUT = 0V
VPP Supply Capacitance
25
pF
VPP = 0V
Note:
(1) 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 20ns.
(2) Output shorted for no more than one second. No more than one output shorted at a time.
(3) This parameter is tested initially and after a design or process change that affects the parameter.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to VCC +1V.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-1078, Rev. K
CAT28F001
D.C. OPERATING CHARACTERISTICS
VCC = +5V ±10%, unless otherwise specified
Limits
Symbol
Parameter
Min.
Max.
Unit
Test Conditions
ILI
Input Leakage Current
±1.0
µA
VIN = VCC or VSS
VCC = 5.5V
ILO
Output Leakage Current
±10
µA
VOUT = VCC or VSS,
VCC = 5.5V
ISB1
VCC Standby Current CMOS
100
µA
CE = VCC ±0.2V = RP
VCC = 5.5V
ISB2
VCC Standby Current TTL
1.5
mA
CE = RP = VIH, VCC = 5.5V
IPPD
VPP Deep Powerdown Current
1.0
µA
RP = GND±0.2V
ICC1
VCC Active Read Current
30
mA
VCC = 5.5V, CE = VIL,
IOUT = 0mA, f = 8 MHz
ICC2(1)
VCC Programming Current
20
mA
VCC = 5.5V,
Programming in Progress
ICC3(1)
VCC Erase Current
20
mA
VCC = 5.5V,
Erase in Progress
IPPS
VPP Standby Current
±10
200
µA
µA
VPP < VCC
VPP > VCC
IPP1
VPP Read Current
200
µA
VPP = VPPH
VPP Programming Current
30
mA
VPP = VPPH,
Programming in Progress
IPP3(1)
VPP Erase Current
30
mA
VPP = VPPH,
Erase in Progress
VIL
Input Low Level
0.8
V
VOL
Output Low Level
0.45
V
VIH
Input High Level
2.0
VCC+0.5
V
VOH
Output High Level
2.4
VID
A9 Signature Voltage
11.5
IID
IPP2
(1)
–0.5
IOL = 5.8mA, VCC = 4.5V
V
IOH = 2.5mA, VCC = 4.5V
13.0
V
A9 = VID
A9 Signature Current
500
µA
A9 = VID
ICCD
VCC Deep Powerdown Current
1.0
µA
RP = GND±0.2V
ICCES
VCC Erase Suspend Current
10
mA
Erase Suspended CE = VIH
IPPES
VPP Erase Suspend Current
300
µA
Erase Suspended VPP=VPPH
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
Doc. No. MD-1078, Rev. K
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
SUPPLY CHARACTERISTICS
Limits
Symbol
Parameter
Min
Max.
Unit
VLKO
VCC Erase/Write Lock Voltage
2.5
V
VCC
VCC Supply Voltage
4.5
5.5
V
VPPL
VPP During Read Operations
0
6.5
V
VPPH
VPP During Erase/Program
11.4
12.6
V
VHH
RP, OE Unlock Voltage
11.4
12.6
V
A.C. CHARACTERISTICS, Read Operation
VCC = +5V ±10%, unless otherwise specified
JEDEC
Symbol
Standard
Symbol
28F001-90(7)
Min
Max
28F001-12(7)
Min
Max
Units
tAVAV
tRC
Parameter
Read Cycle Time
tELQV
tCE
CE Access Time
90
120
ns
tAVQV
tACC
Address Access Time
90
120
ns
tGLQV
tOE
OE Access Time
35
50
ns
-
tOH
tGLQX
tELQX
tGHQZ
(1)(6)
90
120
ns
Output Hold from Address OE/CE Change
0
0
ns
OE to Output in Low-Z
0
0
ns
(1)(6)
CE to Output in Low-Z
0
0
ns
(1)(2)
OE High to Output High-Z
30
30
ns
(1)(2)
tOLZ
tLZ
tDF
tEHQZ
tHZ
CE High to Output High-Z
35
55
ns
tPHQV
tPWH
RP High to Output Delay
600
600
ns
Figure 1. A.C. Testing Input/Output Waveform(3)(4)(5)
VCC - 0.3V
Figure 2. Highspeed A.C. Testing Input/Output
Waveform(3)(4)(5)
3.0 V
2.0 V
INPUT PULSE LEVELS
REFERENCE POINTS
INPUT PULSE LEVELS
0.0 V
0.0 V
Testing Load Circuit (example)
Testing Load Circuit (example)
1.3V
1.3V
1N914
1N914
3.3K
DEVICE
UNDER
TEST
REFERENCE POINTS
1.5 V
0.8 V
3.3K
DEVICE
UNDER
TEST
OUT
CL = 100 pF
CL INCLUDES JIG CAPACITANCE
OUT
CL = 30 pF
CL INCLUDES JIG CAPACITANCE
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 where the external data line is no longer driven by the output buffer.
(3) Input Rise and Fall Times (10% to 90%) < 10 ns.
(4) Input Pulse Levels = 0.45V and 2.4V. For High Speed Input Pulse Levels 0.0V and 3.0V.
(5) Input and Output Timing Reference = 0.8V and 2.0V. For High Speed Input and Output Timing Reference = 1.5V.
(6) Low-Z is defined as the state where the external data may be driven by the output buffer but may not be valid.
(7) For load and reference points, see Fig. 1
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-1078, Rev. K
CAT28F001
A.C. CHARACTERISTICS, Program/Erase Operation
VCC = +5V ±10%
JEDEC
Symbol
Standard
Symbol
Parameter
28F001-90
Min
Max
28F001-12
Min
Max
Units
tAVAV
tWC
Write Cycle Time
90
120
ns
tAVWH
tAS
Address Setup to WE Going High
40
40
ns
tWHAX
tAH
Address Hold Time from WE Going High
10
10
ns
tDVWH
tWHDX
tDS
Data Setup Time to WE Going High
40
40
ns
tDH
Data Hold Time from WE Going High
10
10
ns
tELWL
tWHEH
tCS
CE Setup Time to WE Going Low
0
0
ns
tCH
tWLWH
tWHWL
tWP
CE Hold Time from WE Going High
WE Pulse Width
0
40
0
40
ns
ns
tWPH
WE High Pulse Width
10
10
ns
tWHGL
—
Write Recovery Time Before Read
0
0
µs
(1)
tPHWL
tPS
RP High Recovery to WE Going Low
480
480
ns
tPHHWH
tPHS(1)
RP VHH Setup to WE Going High
100
100
ns
tVPWH
tVPS(1)
VPP Setup to WE Going High
100
100
ns
tWHQV1
—
Duration of Programming Operations
15
15
µs
tWHQV2
tWHQV3
tWHQV4
—
—
Duration of Erase Operations (Boot)
Duration of Erase Operations (Parameter)
1.3
1.3
1.3
1.3
Sec
Sec
tQVVL
—
Duration of Erase Operations (Main)
3
3
Sec
(1)
VPP Hold from Valid Status Reg Data
0
0
ns
(1)
0
0
ns
tVPH
tPHH
RP VHH Hold from Status Reg Data
tPHBR
(1)
—
Boot Block Relock Delay
tGHHWL
—
OE VHH Setup to WE Going Low
480
480
ns
tWHGH
—
OE VHH Hold from WE High
480
480
ns
tQVPH
100
100
ns
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
Doc. No. MD-1078, Rev. K
6
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
ERASE AND PROGRAMMING PERFORMANCE
28F001-90
Parameter
Min
28F001-12
Typ
Max
Boot Block Erase Time
2.10
Boot Block Program Time
Min
Typ
Max
Units
14.9
2.10
14.9
Sec
0.15
0.52
0.15
0.52
Sec
Parameter Block Erase Time
2.10
14.6
2.10
14.6
Sec
Parameter Block Program Time
0.07
0.26
0.07
0.26
Sec
Main Block Erase Time
3.80
20.9
3.80
20.9
Sec
Main Block Program Time
2.10
7.34
2.10
7.34
Sec
Chip Erase Time
10.10
65
10.10
65
Sec
Chip Program Time
2.39
8.38
2.39
8.38
Sec
FUNCTION TABLE(1)
Pins
Mode
RP
CE
OE
WE
VPP
I/O
Read
VIH
VIL
VIL
VIH
X
DOUT
Output Disable
VIH
VIL
VIH
VIH
X
High-Z
Standby
VIH
VIH
X
X
X
High-Z
Signature (MFG)
VIH
VIL
VIL
VIH
X
31H
A0 = VIL, A9 = 12V
Signature (Device)
VIH
VIL
VIL
VIH
X
94H-28F001T
95H-28F001B
A0 = VIH, A9 = 12V
Write Cycle
VIH
VIL
VIH
VIL
X
DIN
During Write Cycle
Deep Power Down
VIL
X
X
X
X
HIGH-Z
Notes
WRITE COMMAND TABLE
Commands are written into the command register in one or two write cycles. Write cycles also internally latch
addresses and data required for programming and erase operations.
Mode
First Bus Cycle
Operation Address
DIN
Operation
Second Bus Cycle
Address
DIN
DOUT
Read Array/Reset
Write
X
FFH
Program Setup/
Program
Write
AIN
40H
10H
Write
AIN
Read Status Reg.
Write
X
70H
Read
X
Clear Status Reg.
Write
X
50H
Erase Setup/Erase
Confirm
Write
Block ad
20H
Write
Block ad
D0H
Erase Suspend/
Erase Resume
Write
X
B0H
Write
X
D0H
Read Sig (Mfg)
Write
X
90H
Read
0000H
31H
Read Sig (Dev)
Write
X
90H
Read
0001H
94H-28F001T
95H-28F001B
DIN
St. Reg. Data
Note:
(1) Logic Levels: X = Logic ‘Do not care’ (VIH, VIL, VPPL, VPPH)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-1078, Rev. K
CAT28F001
READ OPERATIONS
Read Mode
applying the required high voltage on address pin A9
while the other address line are held at VIL.
The CAT28F001 memory can be read from any of its
Blocks (Boot Block, Main Block or Parameter Block),
Status Register and Signature Information by sending
the Read Command Mode to the Command Register.
A Read cycle from address 0000H retrieves the binary
code for the IC manufacturer on outputs I/O7 to I/O0:
CAT28F001 automatically resets to Read Array mode
upon initial device power up or after exit from deep
power down. A Read operation is performed with both
CE and OE low and with RP and OE high. Vpp can be
either high or low. The data retrieved from the I/O pins
reflects the contents of the memory location corresponding to the state of the 17 address pins. The respective
timing waveforms for the read operation are shown in
Figure 3. Refer to the AC Read characteristics for
specific timing parameters.
Catalyst Code = 0011 0001 (31H)
A Read cycle from address 0001H retrieves the binary
code for the device on outputs I/O7 to I/O0:
CAT28F001T = 1001 0100 (94H)
CAT28F001B = 1001 0101 (95H)
Standby Mode
With CE at a logic-high level, the CAT28F001 is placed
in a standby mode where most of the device circuitry is
disabled, thereby substantially reducing power consumption. The outputs are placed in a high-impendance
state independent of the OE status.
Signature Mode
The signature mode allows the user to identify the IC
manufacturer and the type of the device while the device
resides in the target system. This mode can be activated
in either of two ways; through the conventional method
of applying a high voltage (12V) to address pin A9 or by
sending an instruction to the command register (see
Write Operations).
Deep Power-Down
When RP is at logic-low level, the CAT28F001 is placed
in a Deep Power-Down mode where all the device
circuitry are disabled, thereby reducing the power consumption to 0.25µW.
The conventional method is entered as a regular read
mode by driving the CE and OE low (with WE high), and
Figure 3. A.C. Timing for Read Operation
POWER UP
STANDBY
DEVICE AND
ADDRESS SELECTION
ADDRESSES
OUPUTS
ENABLED
DATA VALID
STANDBY
POWER DOWN
ADDRESS STABLE
tAVAV (tRC)
CE (E)
tEHQZ
OE (G)
tGHQZ (tDF)
tGLQV (tOE)
WE (W)
tELQV (tCE)
tGLQX (tOLZ)
tELQX (tLZ)
tOH
HIGH-Z
HIGH-Z
DATA (I/O)
OUTPUT VALID
tAVQV (tACC)
tPHQV (tPWH)
RP (P)
Doc. No. MD-1078, Rev. K
8
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
block erasure. During the first write cycle, a Command
20H (Erase Setup) is first written to the Command
Register, followed by the Command D0H (Erase Confirm). These commands require both appropriate command data and an address within Block to be erased.
Also, Block erasure can only occur when VPP= VPPH.
WRITE OPERATIONS
The following operations are initiated by observing the
sequence specified in the Write Command Table.
Read Array
The device can be put into a Read Array Mode by
initiating a write cycle with FFH on the data bus. The
device is also in a standard Read Array Mode after the
initial device power up and when comes out of the Deep
Power-Down mode.
Block preconditioning, erase and verify are all handled
internally by the Write State Machine, invisible to the
system. After receiving the two command erase sequence the CAT28F001 automatically outputs Status
Register data when read (Fig.5). The CPU can detect
the completion of the erase event by checking if the
SR.7 of the Status Register is set.
Signature Mode
An alternative method for reading device signature (see
Read Operations Signature Mode), is initiated by writing
the code 90H into the command register. A read cycle
from address 0000H with CE and OE low (and WE high)
will output the device signature.
SR.5 will indicate whether the erase was successful. If
an erase error is detected, the Status Register should be
cleared. The device will be in the Status Register Read
Mode until another command is issued.
Catalyst Code = Catalyst Code = 0011 0001 (31H)
ERASE SUSPEND/ERASE RESUME
The Erase Suspend Command allows erase sequence
interruption in order to read data from another block of
memory. Once the erase sequence is started, writing
the Erase Suspend command (B0H) to the Command
Register requests that the WSM suspend the erase
sequence at a predetermined point in the erase algorithm. The CAT28F001 continues to output Status Register data when read, after the Erase Suspend command
is written to it. Polling the WSM Status and Erase
Suspend Status bits will determine when the erase
operation has been suspended (both will be set to “1s”).
A Read cycle from address 0001H retrieves the
binary code for the device on outputs I/O7 to I/O0:
CAT28F001T = 1001 0100 (94H)
CAT28F001B = 1001 0101 (95H)
To terminate the operations, it is necessary to write
another valid command into the register.
STATUS REGISTER
The device may now be given a Read ARRAY Command, which allows any locations 'not within the block
being erased' to be read. Also, you can either perform
a Read Status Register or resume the Erase Operation
by sending Erase Resume (D0H), at which time the
WSM will continue with the erase sequence. The Erase
Suspend Status and WSM Status bits of the Status
Register will be cleared.
The 28F001 contains an 8-bit Status Register. The
Status Register is polled to check for write or erase
completion or any related errors. The Status Register
may be read at any time by issuing a Read Status
Register (70H) command. All subsequent read operations output data from the Status Register, until another
valid command is issued. The contents of the Status
Register are latched on the falling edge of OE or CE ,
whichever occurs last in the read cycle. OE or CE must
be toggled to VIH before further reads to update the
status register latch.
PROGRAM SETUP/PROGRAM COMMANDS
Programming is executed by a two-write sequence. The
program Setup command (40H) is written to the Command Register, followed by a second write specifying
the address and data (latched on the rising edge of WE)
to be programmed. The WSM then takes over, controlling the program and verify algorithms internally. After
the two-command program sequence is written to it, the
CAT28F001 automatically outputs Status Register data
when read (see figure 4; Byte Program Flowchart). The
CPU can detect the completion of the program event by
analyzing the WSM Status bit of the Status Register.
Only the Read Status Register Command is valid while
programming is active.
The Erase Status (SR.5) and Program Status (SR.4) are
set to 1 by the WSM and can only be reset issuing Clear
Status Register (50H) These two bits can be polled for
failures, thus allowing more flexibility to the designer
when using the CAT28F001. Also, VPP Status (SR.3)
when set to 1 must be reset by system software before
any further byte programs or block erases are attempted.
ERASE SETUP/ERASE CONFIRM
Erase is executed one block at a time, initiated by a two
cycle command sequence. The two cycle command
sequence provides added security against accidental
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-1078, Rev. K
CAT28F001
WSMS
ESS
ES
PS
VPPS
R
R
R
7
6
5
4
3
2
1
0
SR.7 = WRITE STATE MACHINE STATUS
1 = Ready
0 = Busy
SR.6 = ERASE SUSPEND STATUS
1 = Erase Suspended
0 = Erase in Progress/Completed
SR.5 = ERASE STATUS
1 = Error in Block Erasure
0 = Successful Block Erase
SR.4 = PROGRAM STATUS
1 = Error in Byte Program
0 = Successful Byte Program
SR.3 = VPP STATUS
1 = VPP Low Detect; Operation Abort
0 = VPP Okay
SR.2 -SR.0 = RESERVED FOR FUTURE ENHANCEMENTS
These bits are reserved for future use and should be masked
out when polling the Status Register.
NOTES:
The Write State Machine Status Bit must first be checked to
determine program or erase completion, before the
Program or Erase Status bits are checked for success.
If the Program AND Erase Status bits are set to “1s” during an
erase attempt, an improper command sequence was
entered. Attempt the operation again.
If VPP low status is detected, the Status Register must be
cleared before another program or erase operation is
attempted.
The VPP Status bit, unlike an A/D converter, does not provide
continuous indication of VPP level. The WSM interrogates
the VPP level only after the program or erase command
sequences have been entered and informs the system if
VPP has not been switched on. The VPP Status bit is not
guaranteed to report accurate feedback between VPPL and
VPPH.
When the Status Register indicates that programming is
complete, the Program Status bit should be checked. If
program error is detected, the Status Register should be
cleared. The internal WSM verify only detects errors for
“1s” that do not successfully program to “0s”. The
Command Register remains in Read Status Register
mode until further commands are issued to it.
bits will be set to “1”. When issuing the Erase Setup and
Erase Confirm commands, they should be written to an
address within the address range of the block to be
erased. Figure 5 shows a system software flowchart for
block erase.
The entire sequence is performed with VPP at VPPH.
Abort occurs when RP transitions to VIL, or VPP drops to
VPPL. Although the WSM is halted, byte data is partially
programmed or Block data is partially erased at the
location where it was aborted. Block erasure or a repeat
of byte programming will initialize this data to a known
value.
If erase/byte program is attempted while VPP = VPPL, the
Status bit (SR.5/SR.4) will be set to “1”. Erase/Program
attempts while VPPL < VPP < VPPH produce spurious
results and should not be attempted.
EMBEDDED ALGORITHMS
The CAT28F001 integrates the Quick Pulse programming algorithm on-chip, using the Command Register,
Status Register and Write State Machine (WSM). Onchip integration dramatically simplifies system software
and provides processor-like interface timings to the
Command and Status Registers. WSM operation, internal program verify, and VPP high voltage presence are
monitored and reported via appropriate Status Register
bits. Figure 4 shows a system software flowchart for
device programming.
BOOT BLOCK PROGRAM AND ERASE
The boot block is intended to contain secure code which
will minimally bring up a system and control programming and erase of other blocks of the device, if needed.
Therefore, additional “lockout” protection is provided to
guarantee data integrity. Boot block program and erase
operations are enabled through high voltage VHH on
either RP or OE, and the normal program and erase
command sequences are used. Reference the AC
Waveforms for Program/Erase.
As above, the Quick Erase algorithm is now implemented internally, including all preconditioning of block
data. WSM operation, erase verify and VPP high voltage
presence are monitored and reported through the Status
Register. Additionally, if a command other than Erase
Confirm is written to the device after Erase Setup has
been written, both the Erase Status and Program Status
Doc. No. MD-1078, Rev. K
If boot block program or erase is attempted while RP is
at VIH, either the Program Status or Erase Status bit will
be set to “1”, reflective of the operation being attempted
and indicating boot block lock. Program/erase attempts
while VIH < RP < VHH produce spurious results and
should not be attempted.
10
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
IN-SYSTEM OPERATION
For on-board programming, the RP pin is the most
convenient means of altering the boot block. Before
issuing Program or Erase confirms commands, RP must
transition to VHH. Hold RP at this high voltage throughout
the program or erase interval (until after Status Register
confirm of successful completion). At this time, it can
return to VIH or VIL.
Figure 4 Byte Programming Flowchart
START
Bus
Operation
Command
Comments
WRITE 40H,
BYTE ADDRESS
Write
Program
Setup
Data = 40H
Address = Bytes to be Programmed
WRITE BYTE
ADDRESS/DATA
Write
Program
Data to be programmed
Address = Byte to be Programmed
READ STATUS
REGISTER
Read
Status Register Data.
Toggle OE or CE to update
Status Register
Check SR.7
Standby
1 = Ready, 0 = Busy
NO
SR.7 = 1?
Repeat for subsequent bytes.
YES
Full Status check can be done after each byte or after a sequence
of bytes.
FULL STATUS
CHECK IF DESIRED
Write FFH after the last byte programming operation to reset the
device to Read Array Mode.
BYTE PROGRAM
COMPLETED
FULL STATUS CHECK PROCEDURE
STATUS REGISTER DATA
READ (SEE ABOVE)
Bus
Operation
SR.3 = 0?
Command
Comments
NO
VPP RANGE
ERROR
Standby
Check SR.3
1 = VPP Low Detect
NO
BYTE PROGRAM
ERROR
Standby
Check SR.3
1 = Byte Program Error
YES
SR.4 = 0?
YES
BYTE PROGRAM
SUCCESSFUL
SR.3 MUST be cleared, if set during a program attempt, before
further attempts are allowed by the Write State Machine.
SR.3 is only cleared by the Clear Status Register Command, in
case where multiple bytes are programmed before full status is
checked.
If error is detected, clear the Status Register before attempting retry
or other error recovery.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-1078, Rev. K
CAT28F001
Figure 5 Block Erase Flowchart
START
Bus
Operation
Command
Comments
WRITE 20H,
BLOCK ADDRESS
Write
Erase
Setup
Data = 20H
Address = Within Block to be erased
WRITE D0H
BLOCK ADDRESS
Write
Erase
Data - D0H
Address = Within Block to be erased
READ STATUS
REGISTER
Read
Status Register Data.
Toggle OE or CE to update
Status Register
Standby
Check SR.7
1 = Ready, 0 = Busy
ERASE SUSPEND
LOOP
NO
SR.7 = 1?
NO
SUSPEND
ERASE?
YES
YES
Repeat for subsequent blocks.
FULL STATUS
CHECK IF DESIRED
Full Status check can be done after each block or after a sequence
of blocks.
Write FFH after the last block erase operation to reset the device to
Read Array Mode.
BLOCK ERASE
COMPLETED
FULL STATUS CHECK PROCEDURE
STATUS REGISTER DATA
READ (SEE ABOVE)
SR.3 = 0?
NO
Bus
Operation
VPP RANGE
ERROR
Command
Comments
Standby
Check SR.3
1 = VPP Low Detect
Standby
Check SR.4
Both 1 = Command Sequence Error
Standby
Check SR.5
1 = Block Erase Error
YES
SR.4,5 = 1?
YES COMMAND SEQUENCE
ERROR
NO
SR.5 = 0?
BLOCK ERASE
SUCCESSFUL
NO
BLOCK ERASE
ERROR
SR.3 MUST be cleared, if set during a erase attempt, before further
attempts are allowed by the Write State Machine.
SR.3 is only cleared by the Clear Status Register Command, in
cases where multiple blocks are erased before full status is
checked.
If error is detected, clear the Status Register before attempting retry
or other error recovery.
Doc. No. MD-1078, Rev. K
12
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
Figure 6 Block Erase Suspend/Resume Flowchart
START
Bus
Operation Command
Comments
Write
Data = B0H
WRITE B0H
READ STATUS
REGISTER
SR.7 = 1?
Erase
Suspend
Standby/
Ready
Read Status Register
Check SR.7
1 = Ready, 0 = Busy
Toggle OE or CE to Update
Status Register
Standby
Check SR.6
1 = Suspended
NO
YES
SR.6 = 1?
NO
ERASE HAS
COMPLETED
YES
Write
Read Array
Data = FFH
WRITE FFH
Read
DONE
READING?
Read array data from block other
than that being erased.
NO
YES
Write
Erase Resume
Data = D0H
WRITE D0H
CONTINUE
ERASE
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
13
Doc. No. MD-1078, Rev. K
CAT28F001
Figure 7. A.C. Timing for Program/Erase Operation
VCC POWER-UP
& STANDBY
WRITE
WRITE PROGRAM OR
VALID ADDRESS & DATA (PROGRAM) AUTOMATED PROGRAM
ERASE SETUP COMMAND
OR ERASE DELAY
OR ERASE CONFIRM COMMAND
READ STATUS
REGISTER DATA
WRITE READ ARRAY
COMMAND
VIH
ADDRESSES (A)
AIN
VIL
AIN
tAVAV
tAVWH
tWHAX
VIH
CE (E)
VIL
tELWL
tWHEH
tWHGL
VIH
OE (G)
VIL
tWHQV 1, 2, 3, 4
tWHWL
VIH
WE (W)
VIL
VIH
tWLWH
tWHDX
tDVWH
HIGH Z
DATA (I/O)
DIN
VIL
VHH
RP (P)
VALID
SRD
DIN
tPHWL
tPHHWH
DIN
tQVPH
6.5V
VIH
VIL
VPPH
VPP (V)
tVPWH
tQVVL
VPPL
VIH
VIL
POWER UP/DOWN PROTECTION
POWER SUPPLY DECOUPLING
The CAT28F001 offers protection against inadvertent
programming during VPP and VCC power transitions.
When powering up the device there is no power-on
sequencing necessary. In other words, VPP and VCC
may power up in any order. Additionally VPP may be
hardwired to VPPH independent of the state of VCC and
any power up/down cycling. The internal command
register of the CAT28F001 is reset to the Read Mode on
power up.
To reduce the effect of transient power supply voltage
spikes, it is good practice to use a 0.1µF ceramic
capacitor between VCC and VSS and VPP and VSS. These
high-frequency capacitors should be placed as close as
possible to the device for optimum decoupling.
Doc. No. MD-1078, Rev. K
14
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
ALTERNATE CE-CONTROLLED WRITES
VCC = +5V ±10%, unless otherwise specified
JEDEC
Symbol
Standard
Symbol
28F001-90
Min
Max
90
28F001-12
Min
Max
120
tAVAV
tWC
Parameter
Write Cycle Time
tAVEH
tAS
Address Setup to CE Going High
40
40
ns
tEHAX
tAH
Address Hold Time from CE Going High
10
10
ns
tDVEH
tEHDX
tDS
tDH
Data Setup Time to CE Going High
Data Hold Time from CE Going High
40
10
40
10
ns
ns
tWLEL
tWS
WE Setup Time to CE Going Low
0
0
ns
tEHWH
tWH
WE Hold Time from CE Going High
0
0
ns
tELEH
tCP
CE Pulse Width
40
40
ns
tEHEL
tEPH
CE High Pulse Width
10
10
ns
tEHGL
—
Write Recovery Time Before Read
0
0
µs
tPHEL
tPS(1)
tPHHEH
Units
ns
RP High Recovery to CE Going Low
480
480
ns
(1)
RP VHH Setup to CE Going High
100
100
ns
(1)
tPHS
tVPEH
tVPS
VPP Setup to CE Going High
100
100
ns
tEHQV1
—
Duration of Programming Operations
15
15
µs
tEHQV2
tEHQV3
tEHQV4
tQVVL
—
—
—
tVPH(1)
Duration of Erase Operations (Boot)
Duration of Erase Operations (Parameter)
Duration of Erase Operations (Main)
VPP Hold from Valid Status Reg Data
1.3
1.3
3
0
1.3
1.3
3
0
Sec
Sec
Sec
ns
tQVPH
tPHH(1)
RP VHH Hold from Status Reg Data
0
0
ns
tPHBR(1)
—
Boot Block Relock Delay
tGHHWL
—
OE VHH Setup to WE Going Low
480
480
ns
tWHGH
—
OE VHH Hold from WE High
480
480
ns
100
100
ns
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
15
Doc. No. MD-1078, Rev. K
CAT28F001
Figure 8. Alternate Boot Block Access Method Using OE
WRITE PROGRAM OR
ERASE SETUP COMMAND
OE
WRITE
VALID ADDRESS AND DATA (PROGRAM)
OR ERASE CONFIRM COMMAND
AUTOMATED PROGRAM
OR ERASE DELAY
READ STATUS
REGISTER DATA
VHH
VIH
VIL
tWHGH
tGHHWL
VIH
WE
VIL
VIH
DATA
DIN
VIL
VALID
SR DATA
DIN
Figure 9. Alternate AC Waveform for Write Operations
VCC POWER-UP
& STANDBY
WRITE
WRITE PROGRAM OR
VALID ADDRESS & DATA (PROGRAM) AUTOMATED PROGRAM
ERASE SETUP COMMAND
OR ERASE DELAY
OR ERASE CONFIRM COMMAND
READ STATUS
REGISTER DATA
WRITE READ ARRAY
COMMAND
VIH
ADDRESSES
AIN
VIL
AIN
tAVEH
tAVAV
tEHAX
VIH
WE (W)
VIL
tWLEL
tEHWH
tEHGL
VIH
OE (a)
VIL
tEHQV 1, 2, 3, 4
tEHEL
VIH
CE (E)
VIL
VIH
tELEH
tDVEH
tEHDX
HIGH Z
DATA I/O
DIN
VIL
VHH
RP (P)
VALID
SRD
DIN
tPHEL
tPHHEH
tQVPH
tVPEH
tQVVL
DIN
6.5V
VIH
VIL
VPPH
VPP (V)
VPPL
VIH
VIL
Doc. No. MD-1078, Rev. K
16
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT28F001
ORDERING INFORMATION
Prefix
CAT
Optional
Company ID
Device #
Suffix
28F001
P
Product
Number
-90
I
Temperature Range
Blank = Commercial (0˚ - 70˚C)
I = Industrial (-40˚ - 85˚C)
A = Automotive (-40˚ - 105˚C)*
Package
N: PLCC
T: TSOP(8mmx20mm)
G: PLCC (Lead free, Halogen free)
L: PDIP (Lead free, Halogen free)
H: TSOP (Lead free, Halogen free)
B
Boot Block
B: Bottom
T: Top
T
Tape & Reel
Speed
90: 90 ns
12: 120 ns
* -40˚ to +125˚C is available upon request
Note:
(1) The device used in the above example is a CAT28F001PI-90BT (PDIP, Industrial Temperature, 90ns access time, Bottom Boot Block,
Tape & Reel)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
17
Doc. No. MD-1078, Rev. K
CAT28F001
REVISION HISTORY
Date
Revision Description
20-Apr-04
G
Delete data sheet designation
Update Features
Update Pin Configuration
Update Ordering Information
Update A. C. Tables
Update Erase Table
Update Alternate Table
Update Ordering Information
Update Revision History
Update Rev Number
2-Sep-04
H
Update Ordering Information
29-Mar-05
I
Update Ordering Information
15-Oct-08
J
Eliminate PDIP SnPb package.
17-Nov-08
K
Change logo and fine print to ON Semiconductor
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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
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Doc. No. MD-1078, Rev. K
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Characteristics subject to change without notice
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