CAT25C128VA-GT2 [CATALYST]

128K/256K-Bit SPI Serial CMOS EEPROM; 128K / 256K位的SPI串行EEPROM CMOS
CAT25C128VA-GT2
型号: CAT25C128VA-GT2
厂家: CATALYST SEMICONDUCTOR    CATALYST SEMICONDUCTOR
描述:

128K/256K-Bit SPI Serial CMOS EEPROM
128K / 256K位的SPI串行EEPROM CMOS

可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器
文件: 总12页 (文件大小:444K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
CAT25C128/256  
128K/256K-Bit SPI Serial CMOS EEPROM  
FEATURES  
I Self-Timed Write Cycle  
I 64-Byte Page Write Buffer  
I Block Write Protection  
I 5 MHz SPI Compatible  
I 1.8 to 5.5 Volt Operation  
I Hardware and Software Protection  
I Low Power CMOS Technology  
I SPI Modes (0,0 &1,1)  
– Protect 1/4, 1/2 or all of EEPROM Array  
I 100,000 Program/Erase Cycles  
I 100 Year Data Retention  
I Industrial and Automotive  
I RoHS-compliant packages  
Temperature Ranges  
DESCRIPTION  
The CAT25C128/256 is a 128K/256K-Bit SPI Serial  
CMOS EEPROM internally organized as 16Kx8/32Kx8  
bits. Catalyst’s advanced CMOS Technology  
substantially reduces device power requirements. The  
CAT25C128/256 features a 64-byte page write buffer.  
The device operates via the SPI bus serial interface  
and is enabled through a Chip Select (CS). In addition  
to the Chip Select, the clock input (SCK), data in (SI)  
and data out (SO) are required to access the device.  
The HOLD pin may be used to suspend any serial  
communication without resetting the serial sequence.  
The CAT25C128/256 is designed with software and  
hardware write protection features including Block Lock  
protection. The device is available in 8-pin DIP, 8-pin  
SOIC, 14-pin TSSOP and 20-pin TSSOP packages.  
PIN CONFIGURATION  
BLOCK DIAGRAM  
TSSOP Package (Y14)**  
SOIC Package  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
CS  
(V**, X)  
V
SENSE AMPS  
SHIFT REGISTERS  
CC  
SO  
NC  
NC  
NC  
WP  
HOLD  
NC  
NC  
NC  
SCK  
SI  
1
2
3
4
8
7
6
5
V
CS  
SO  
WP  
CC  
HOLD  
SCK  
SI  
COLUMN  
DECODERS  
WORD ADDRESS  
BUFFERS  
V
SS  
V
8
SS  
TSSOP Package (Y20)**  
DIP Package (L)  
SO  
SI  
I/O  
CONTROL  
1
2
3
4
5
6
20  
19  
18  
17  
16  
NC  
CS  
NC  
1
2
3
4
8
7
6
5
V
CS  
SO  
CC  
V
CC  
CS  
EEPROM  
ARRAY  
HOLD  
SCK  
SI  
SPI  
CONTROL  
LOGIC  
XDEC  
HOLD  
HOLD  
NC  
SO  
SO  
NC  
NC  
WP  
WP  
WP  
SS  
HOLD  
SCK  
15  
14  
13  
12  
11  
NC  
SCK  
7
**CAT25C128 only.  
BLOCK  
PROTECT  
LOGIC  
V
SI  
NC  
NC  
8
SS  
NC  
NC  
9
10  
DATA IN  
STORAGE  
PIN FUNCTIONS  
Pin Name  
SO  
Function  
Serial data Output  
Serial Clock  
Write Protect  
Power Supply  
Ground  
HIGH VOLTAGE/  
TIMING CONTROL  
SCK  
WP  
VCC  
STATUS  
REGISTER  
VSS  
CS  
Chip Select  
SI  
HOLD  
NC  
Serial Data Input  
Suspends Serial Input  
No Connect  
For Ordering Information details, see page 11.  
© 2005 by Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
Document No. 1018, Rev. I  
1
CAT25C128/256  
ABSOLUTE MAXIMUM RATINGS*  
*COMMENT  
Temperature Under Bias ................. –55°C to +125°C  
Storage Temperature....................... –65°C to +150°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  
thoselistedintheoperationalsectionsofthisspecification  
isnotimplied.Exposuretoanyabsolutemaximumrating  
for extended periods may affect device performance  
and reliability.  
Voltage on any Pin with  
Respect to VSS1) ................... –2.0V to +VCC +2.0V  
VCC with Respect to VSS ................................ –2.0V to +7.0V  
Package Power Dissipation  
Capability (Ta = 25°C)................................... 1.0W  
Lead Soldering Temperature (10 secs) ............ 300°C  
Output Short Circuit Current(2) ........................ 100 mA  
RELIABILITY CHARACTERISTICS  
Symbol  
Parameter  
Endurance  
Min.  
100,000  
100  
Max.  
Units  
Cycles/Byte  
Years  
(3)  
NEND  
(3)  
TDR  
Data Retention  
ESD Susceptibility  
Latch-Up  
(3)  
VZAP  
2000  
100  
Volts  
(3)(4)  
ILTH  
mA  
D.C. OPERATING CHARACTERISTICS  
= +1.8V to +5.5V, unless otherwise specified.  
V
CC  
Limits  
Typ.  
Symbol  
Parameter  
Min.  
Max.  
Units  
Test Conditions  
ICC1  
Power Supply Current  
(Operating Write)  
10  
mA  
VCC = 5V @ 5MHz  
SO=open; CS=Vss  
ICC2  
Power Supply Current  
(Operating Read)  
2
mA  
VCC = 5.0V  
FCLK = 5MHz  
(5)  
ISB  
Power Supply Current  
(Standby)  
1
µA  
CS = VCC  
VIN = VSS or VCC  
ILI  
Input Leakage Current  
Output Leakage Current  
2
3
µA  
µA  
ILO  
VOUT = 0V to VCC  
,
CS = 0V  
(3)  
VIL  
Input Low Voltage  
Input High Voltage  
Output Low Voltage  
Output High Voltage  
-1  
VCC x 0.3  
VCC + 0.5  
0.4  
V
V
V
V
(3)  
VIH  
VCC x 0.7  
4.5VV <5.5V  
VOL1  
VOH1  
CC  
= 3.0mA  
= -1.6mA  
I
I
OL  
OH  
VCC - 0.8  
VOL2  
VOH2  
Output Low Voltage  
Output High Voltage  
0.2  
V
V
1.8VVCC<2.7V  
VCC-0.2  
IOL = 150µA  
IOH = -100µA  
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 V +0.5V, which may overshoot to V +2.0V for periods of less than 20 ns.  
CC  
CC  
(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 according to appropriate AEC-Q100 and  
JEDEC test methods.  
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to V +1V.  
CC  
(5) Maximum standby current (I ) = 10µA for the Automotive and Extended Automotive temperature range.  
SB  
Document No. 1018, Rev. I  
2
CAT25C128/256  
(1)  
PIN CAPACITANCE  
Applicable over recommended operating range from TA=25˚C, f=1.0 MHz, VCC=+5.0V (unless otherwise noted).  
Symbol  
COUT  
CIN  
Test Conditions  
Max.  
Units  
pF  
Conditions  
Output Capacitance (SO)  
8
6
VOUT=0V  
VIN=0V  
Input Capacitance (CS, SCK, SI, WP, HOLD)  
pF  
A.C. CHARACTERISTICS (CAT25C128)  
SYMBOL PARAMETER  
Limits  
Vcc=  
1.8V-5.5V  
VCC  
2.5V-5.5V  
=
VCC  
4.5V-5.5V  
Max. Min. Max. UNITS Conditions  
=
Test  
Min. Max. Min.  
tSU  
tH  
Data Setup Time  
Data Hold Time  
100  
100  
250  
250  
DC  
70  
70  
35  
35  
80  
80  
DC  
ns  
ns  
tWH  
tWL  
fSCK  
tLZ  
SCK High Time  
150  
150  
DC  
ns  
SCK Low Time  
ns  
Clock Frequency  
HOLD to Output Low Z  
Input Rise Time  
1
50  
2
3
50  
2
5
50  
2
MHz  
ns  
(1)  
tRI  
µs  
µs  
ns  
(1)  
tFI  
Input Fall Time  
2
2
2
CL = 50pF  
tHD  
tCD  
tWC  
tV  
HOLD Setup Time  
HOLD Hold Time  
Write Cycle Time  
Output Valid from Clock Low  
Output Hold Time  
Output Disable Time  
HOLD to Output High Z  
CS High Time  
250  
250  
250  
250  
40  
40  
ns  
10  
10  
5
ms  
ns  
250  
250  
80  
tHO  
tDIS  
tHZ  
tCS  
tCSS  
0
0
0
ns  
250  
150  
250  
150  
100  
50  
ns  
ns  
1000  
1000  
250  
250  
200  
100  
ns  
CS Setup Time  
ns  
tCSH  
tWPS  
tWPH  
CS Hold Time  
WP Setup Time  
WP Hold Time  
500  
50  
50  
250  
50  
50  
100  
50  
50  
ns  
ns  
ns  
NOTE:  
(1) This parameter is tested initially and after a design or process change that affects the parameter.  
Document No. 1018, Rev. I  
3
CAT25C128/256  
A.C. CHARACTERISTICS (CAT25C256)  
Limits  
Vcc=  
1.8V-5.5V  
Min. Max. Min. Max. Min. Max. Min. Max. UNITS Conditions  
VCC  
2.5V-5.5V  
=
VCC  
=
VCC=  
2.7V-5.5V 4.5V-5.5V  
Test  
SYMBOL PARAMETER  
tSU  
tH  
Data Setup Time  
Data Hold Time  
500  
500  
100  
100  
250  
250  
DC  
70  
70  
35  
ns  
ns  
35  
tWH  
tWL  
fSCK  
tLZ  
SCK High Time  
2500  
2500  
DC  
150  
150  
2.0 DC  
50  
80  
ns  
SCK Low Time  
80  
ns  
Clock Frequency  
HOLD to Output Low Z  
Input Rise Time  
0.2  
100  
2
2.5 DC  
5
50  
2
MHz  
ns  
50  
2
(3)  
tRI  
2
µs  
µs  
ns  
(3)  
tFI  
Input Fall Time  
2
2
2
2
CL = 50pF  
tHD  
tCD  
tWC  
tV  
HOLD Setup Time  
HOLD Hold Time  
Write Cycle Time  
Output Valid from Clock Low  
Output Hold Time  
Output Disable Time  
HOLD to Output High Z  
CS High Time  
250  
250  
100  
100  
100  
100  
10  
40  
40  
ns  
10  
10  
5
ms  
ns  
250  
200  
0
200  
0
80  
tHO  
tDIS  
tHZ  
tCS  
tCSS  
0
0
ns  
250  
150  
200  
100  
100  
100  
200  
100  
100  
100  
100  
50  
ns  
ns  
100  
100  
100  
100  
ns  
CS Setup Time  
ns  
tCSH  
tWPS  
tWPH  
CS Hold Time  
WP Setup Time  
WP Hold Time  
100  
50  
50  
100  
50  
50  
100  
50  
50  
100  
50  
50  
ns  
ns  
ns  
NOTE:  
(3) This parameter is tested initially and after a design or process change that affects the parameter.  
Document No. 1018, Rev. I  
4
CAT25C128/256  
SO: Serial Output  
FUNCTIONAL DESCRIPTION  
SO is the serial data output pin. This pin is used to transfer  
dataoutoftheCAT25C128/256. Duringareadcycle, data  
is shifted out on the falling edge of the serial clock.  
The CAT25C128/256 supports the SPI bus data  
transmissionprotocol.ThesynchronousSerialPeripheral  
Interface (SPI) helps the CAT25C128/256 to interface  
directly with many of today’s popular microcontrollers.  
The CAT25C128/256 contains an 8-bit instruction  
register. (The instruction set and the operation codes  
are detailed in the instruction set table)  
SCK: Serial Clock  
SCK is the serial clock pin. This pin is used to synchronize  
the communication between the microcontroller and the  
CAT25C128/256. Opcodes, byte addresses, or data  
present on the SI pin are latched on the rising edge of the  
SCK. Data on the SO pin is updated on the falling edge of  
the SCK.  
After the device is selected with CS going low, the first  
byte will be received. The part is accessed via the SI pin,  
with data being clocked in on the rising edge of SCK.  
Thefirstbytecontainsoneofthesixop-codesthatdefine  
the operation to be performed.  
CS: Chip Select  
CSistheChipselectpin.CSlowenablestheCAT25C128/  
256 and CS high disables the CAT25C128/256. CS high  
takes the SO output pin to high impedance and forces the  
devices into a Standby Mode (unless an internal write  
operation is underway). The CAT25C128/256 draws  
ZEROcurrentintheStandbymode.Ahightolow transition  
on CS is required prior to any sequence being initiated. A  
low to high transition on CS after a valid write sequence is  
what initiates an internal write cycle.  
PIN DESCRIPTION  
SI: Serial Input  
SI is the serial data input pin. This pin is used to input all  
opcodes, byte addresses, and data to be written to the  
25C32/64. Input data is latched on the rising edge of the  
serial clock.  
Figure 1. Sychronous Data Timing  
t
CS  
VIH  
CS  
VIL  
t
CSH  
t
CSS  
VIH  
VIL  
t
t
WL  
SCK  
SI  
WH  
t
H
t
SU  
VIH  
VALID IN  
V
IL  
t
RI  
FI  
t
t
V
t
t
HO  
DIS  
VOH  
VOL  
HI-Z  
HI-Z  
SO  
Note: Dashed Line= mode (1, 1) — — — —  
INSTRUCTION SET  
Instruction  
WREN  
WRDI  
Opcode  
Operation  
0000 0110  
0000 0100  
0000 0101  
0000 0001  
0000 0011  
0000 0010  
Enable Write Operations  
Disable Write Operations  
Read Status Register  
Write Status Register  
Read Data from Memory  
Write Data to Memory  
RDSR  
WRSR  
READ  
WRITE  
Document No. 1018, Rev. I  
5
CAT25C128/256  
WP: Write Protect  
9 illustrates hold timing sequence.  
WP is the Write Protect pin. The Write Protect pin will  
allow normal read/write operations when held high.  
When WP is tied low and the WPEN bit in the status  
register is set to “1”, all write operations to the status  
register are inhibited. WP going low while CS is still low  
will interrupt a write to the status register. If the internal  
write cycle has already been initiated, WP going low will  
have no effect on any write operation to the status  
register.TheWPpinfunctionisblockedwhentheWPEN  
bit is set to 0.  
STATUS REGISTER  
The Status Register indicates the status of the device.  
TheRDY(Ready)bitindicateswhethertheCAT25C128/  
256 is busy with a write operation. When set to 1 a write  
cycle is in progress and when set to 0 the device  
indicates it is ready. This bit is read only.  
The WEL (Write Enable) bit indicates the status of the  
writeenablelatch. Whensetto1, thedeviceisinaWrite  
Enable state and when set to 0 the device is in a Write  
Disablestate. TheWELbitcanonlybesetbytheWREN  
instruction and can be reset by the WRDI instruction.  
HOLD: Hold  
The HOLD pin is used to pause transmission to the  
CAT25C128/256 while in the middle of a serial sequence  
without having to re-transmit entire sequence at a later  
time. To pause, HOLD must be brought low while SCK is  
low. The SO pin is in a high impedance state during the  
time the part is paused, and transitions on the SI pins will  
be ignored. To resume communication, HOLD is brought  
high, while SCK is low. (HOLD should be held high any  
time this function is not being used.) HOLD may be tied  
high directly to Vcc or tied to Vcc through a resistor. Figure  
The BP0 and BP1 (Block Protect) bits indicate which  
blocks are currently protected. These bits are set by the  
user issuing the WRSR instruction. The user is allowed  
to protect quarter of the memory, half of the memory or  
the entire memory by setting these bits. Once protected  
the user may only read from the protected portion of the  
array. These bits are non-volatile.  
STATUS REGISTER  
7
6
5
4
3
2
1
0
WPEN  
X
X
X
BP1  
BP0  
WEL  
RDY  
BLOCK PROTECTION BITS  
Status Register Bits  
Array Address  
Protected  
Protection  
BP1  
0
BP0  
0
None  
No Protection  
0
1
25C128: 3000-3FFF  
25C256: 6000-7FFF  
Quarter Array Protection  
Half Array Protection  
Full Array Protection  
1
1
0
1
25C128: 2000-3FFF  
25C256: 4000-7FFF  
25C128: 0000-3FFF  
25C256: 0000-7FFF  
WRITE PROTECT ENABLE OPERATION  
Protected  
Blocks  
Unprotected  
Blocks  
Status  
WPEN  
WP  
X
WEL  
Register  
0
0
1
1
X
X
0
1
0
1
0
1
Protected  
Protected  
Protected  
Protected  
Protected  
Protected  
Protected  
Writable  
Protected  
Writable  
Protected  
Writable  
Protected  
Writable  
X
Low  
Low  
High  
High  
Protected  
Protected  
Protected  
Writable  
Document No. 1018, Rev. I  
6
CAT25C128/256  
TheWPEN(WriteProtectEnable)isanenablebitforthe  
WP pin. The WP pin and WPEN bit in the status register  
control the programmable hardware write protect fea-  
ture. Hardware write protection is enabled when WP is  
low and WPEN bit is set to high. The user cannot write  
tothestatusregister(includingtheblockprotectbitsand  
the WPEN bit) and the block protected sections in the  
memory array when the chip is hardware write pro-  
tected. Only the sections of the memory array that are  
not block protected can be written. Hardware write  
protection is disabled when either WP pin is high or the  
WPEN bit is zero.  
latch) to the device. Disabling writes will protect the  
device against inadvertent writes.  
READ Sequence  
The part is selected by pulling CS low. The 8-bit read  
instructionistransmittedtotheCAT25C128/256,followed  
by the 16-bit address(the three Most Significant Bit is  
don’t care for 25C256 and four most significant bits are  
don't care for 25C128).  
After the correct read instruction and address are sent,  
the data stored in the memory at the selected address is  
shifted out on the SO pin. The data stored in the memory  
atthenextaddresscanbereadsequentiallybycontinuing  
to provide clock pulses. The internal address pointer is  
automatically incremented to the next higher address  
after each byte of data is shifted out. When the highest  
address (7FFFh for 25C256 and 3FFFh for 25C128) is  
reached,theaddresscounterrollsoverto0000hallowing  
the read cycle to be continued indefinitely. The  
readoperation is terminated by pulling the CS high.  
DEVICE OPERATION  
Write Enable and Disable  
TheCAT25C128/256containsawriteenablelatch. This  
latch must be set before any write operation. The device  
powers up in a write disable state when Vcc is applied.  
WRENinstructionwillenable writes(setthelatch)tothe  
device. WRDI instruction will disable writes (reset the  
Figure 2. WREN Instruction Timing  
CS  
SK  
1
1
0
SI  
0
0
0
0
0
HIGH IMPEDANCE  
SO  
Figure 3. WRDI Instruction Timing  
CS  
SK  
SI  
1
0
0
0
0
0
0
0
HIGH IMPEDANCE  
SO  
Note: Dashed Line= mode (1, 1) — — — —  
Document No. 1018, Rev. I  
7
CAT25C128/256  
To read the status register, RDSR instruction should be  
sent. The contents of the status register are shifted out  
on the SO line. The status register may be read at any  
time even during a write cycle. Read sequece is illus-  
trated in Figure 4. Reading status register is illustrated in  
Figure 5.  
properly set. Also, for a successful write operation the  
address of the memory location(s) to be programmed  
must be outside the protected address field location  
selected by the block protection level.  
Byte Write  
WRITE Sequence  
Once the device is in a Write Enable state, the user may  
proceed with a write sequence by setting the CS low,  
issuing a write instruction via the SI line, followed by the  
16-bit address (the three Most Significant Bits are don’t  
care for 25C256 and four most significant bits are don't  
care for 25C128), and then the data to be written.  
ProgrammingwillstartaftertheCSisbroughthigh. Figure  
6 illustrates byte write sequence.  
The CAT25C128/256 powers up in a Write Disable  
state. Prior to any write instructions, the WREN instruc-  
tion must be sent to CAT25C128/256. The device goes  
into Write enable state by pulling the CS low and then  
clocking the WREN instruction into CAT25C128/256.  
TheCSmustbebroughthighaftertheWRENinstruction  
to enable writes to the device. If the write operation is  
initiated immediately after the WREN instruction without  
CS being brought high, the data will not be written to the  
array because the write enable latch will not have been  
During an internal write cycle, all commands will be  
ignored except the RDSR (Read Status Register)  
instruction.  
Figure 4. Read Instruction Timing  
CS  
0
1
2
3
4
5
6
7
8
9
10  
20 21 22 23 24 25 26 27 28 29 30  
SK  
OPCODE  
BYTE ADDRESS*  
SI  
0
0
0
0
0
0
1
1
DATA OUT  
HIGH IMPEDANCE  
SO  
7
6
5
4
3
2
1
0
MSB  
*Please check the instruction set table for address  
Note: Dashed Line= mode (1, 1) — — — —  
Figure 5. RDSR Timing  
CS  
0
1
2
3
4
5
6
0
7
1
8
9
10  
11  
12  
13  
14  
SCK  
OPCODE  
0
0
0
0
0
1
SI  
DATA OUT  
HIGH IMPEDANCE  
SO  
5
7
6
4
3
2
1
0
MSB  
Note: Dashed Line= mode (1, 1) — — — —  
Document No. 1018, Rev. I  
8
CAT25C128/256  
address counter reaches the end of the page and clock  
continues, the counter will “roll over” to the first address  
of the page and overwrite any data that may have been  
written. The CAT25C128/256 is automatically returned  
to the write disable state at the completion of the write  
cycle. Figure 8 illustrates the page write sequence.  
TheStatusRegistercanbereadtodetermineifthewrite  
cycle is still in progress. If Bit 0 of the Status Register is  
set at 1, write cycle is in progress. If Bit 0 is set at 0, the  
device is ready for the next instruction.  
Page Write  
The CAT25C128/256 features page write capability.  
After the first initial byte the host may continue to write  
up to 64 bytes of data to the CAT25C128/256. After  
each byte of data is received, six lower order address  
bits are internally incremented by one; the high order  
bits of address will remain constant. The only restriction  
is that the 64 bytes must reside on the same page. If the  
To write to the status register, the WRSR instruction  
should be sent. Only Bit 2, Bit 3 and Bit 7 of the status  
register can be written using the WRSR instruction.  
Figure 7 illustrates the sequence of writing to status  
register.  
Figure 6. Write Instruction Timing  
CS  
0
1
2
3
4
5
6
7
8
21 22 23 24 25 26 27 28 29 30  
3
SK  
SI  
OPCODE  
DATA IN  
D7 D6 D5 D4 D3 D2 D1 D0  
0
0
0
0
0
0
1
0
ADDRESS  
HIGH IMPEDANCE  
SO  
Note: Dashed Line= mode (1, 1) — — — —  
Figure 7. WRSR Timing  
CS  
0
1
2
3
4
5
6
7
1
8
7
9
6
10  
5
11  
4
12  
13  
2
14  
1
15  
0
SCK  
OPCODE  
DATA IN  
SI  
0
0
0
0
0
0
0
3
MSB  
HIGH IMPEDANCE  
SO  
Note: Dashed Line= mode (1, 1) — — — —  
Figure 8. Page Write Instruction Timing  
CS  
24+(N-1)x8-1..24+(N-1)x8 24+Nx8-1  
0
1
2
3
4
5
6
7
8
21 22 23  
32-39  
24-31  
SK  
SI  
DATA IN  
OPCODE  
Data  
Byte 1  
Data  
Data  
Data Byte N  
0
0
0
0
0
0
1
0
ADDRESS  
0
Byte 2 Byte 3  
7..1  
HIGH IMPEDANCE  
SO  
Note: Dashed Line= mode (1, 1) — — — —  
Document No. 1018, Rev. I  
9
CAT25C128/256  
DESIGN CONSIDERATIONS  
The CAT25C128/256 powers up in a write disable state  
and in a low power standby mode. A WREN instruction  
must be issued to perform any writes to the device after  
power up. Also,on power up CS should be brought low  
to enter a ready state and receive an instruction. After  
a successful byte/page write or status register write the  
CAT25C128/256 goes into a write disable mode. CS  
must be set high after the proper number of clock cycles  
tostartaninternalwritecycle. Accesstothearrayduring  
an internal write cycle is ignored and program-ming  
is continued. On power up, SO is in a high impedance.  
If an invalid op code is received, no data will be shifted  
intotheCAT25C128/256, andtheserialoutputpin(SO)  
will remain in a high impedence state until the falling  
edge of CS is detected again.  
Whenpoweringdown,thesupplyshouldbetakendown  
to 0V, so that the CAT25C128/256 will be reset when  
power is ramped back up. If this is not possible, then,  
following a brown-out episode, the CAT25C128/256  
can be reset by refreshing the contents of the Status  
Register (See Application Note AN10).  
Figure 9. HOLD Timing  
CS  
t
t
CD  
CD  
SCK  
t
HD  
t
HD  
HOLD  
SO  
t
HZ  
HIGH IMPEDANCE  
t
LZ  
Note: Dashed Line= mode (1, 1) — — — —  
Figure 10. WP Timing  
t
t
WPH  
WPS  
t
CSH  
SCK  
WP  
Note: Dashed Line= mode (1, 1) — — — —  
Document No. 1018, Rev. I  
10  
CAT25C128/256  
ORDERING INFORMATION  
Prefix  
Device #  
25C128  
Suffix  
- 1.8  
– G  
T3  
V
CAT  
I
Product  
Tape & Reel  
T: Tape & Reel  
2: 2000/Reel  
3: 3000/Reel  
Temperature Range  
Optional  
Company ID  
Number  
I = Industrial (-40˚C to +85˚C)  
A = Automotive (-40˚C to +105˚C)  
25C128: 128K  
25C256: 256K  
E = Extended (-40˚C to +125˚C)  
Package  
L: PDIP  
Lead Finish  
Blank: Matte-Tin  
G: NiPdAu  
V: SOIC, JEDEC**  
X: SOIC, EIAJ(4)  
Y14: 14-Pin TSSOP**  
Y20: 20-Pin TSSOP**  
Operating Voltage  
Blank (VCC = 2.5V to 5.5V  
1.8 (VCC = 1.8V to 5.5V)  
**CAT25C128 only  
Notes:  
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).  
(2) The standard finish is NiPdAu pre-plated (PPF).  
(3) The device used in the above example is a CAT25C128VI-1.8-GT3 (SOIC, Industrial Temperature, 1.8V to 5.5V Operating Voltage,  
NiPdAu, Tape & Reel).  
(4) For SOIC, EIAJ (X) package the standard finish is Matte-Tin. This package is available in 2000 pcs/reel, i.e. CAT25C256XI-T2.  
(5) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.  
Document No. 1018, Rev. I  
11  
REVISION HISTORY  
Date  
Rev.  
Reason  
8/5/2004  
F
Updated Features  
Updated DC Operating Characteristics table & notes  
2/172005  
05/23/2005  
10/13/06  
G
H
I
Updated D.C. Operating Characteristics table  
Updated Reliability Characteristics table  
Update Features  
Update Description  
Update Pin Configuration  
Update Pin Funtions  
Update D.C. Operating Characteristics (V Range)  
CC  
Update A.C. Characteristics tables (V Range)  
CC  
Update Ordering Information  
Copyrights, Trademarks and Patents  
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:  
DPP ™  
DPPs ™ AE2 ™  
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.  
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS  
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE  
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING  
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.  
Catalyst Semiconductor 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 Catalyst Semiconductor product could create a  
situation where personal injury or death may occur.  
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets  
labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.  
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate  
typical semiconductor applications and may not be complete.  
Catalyst Semiconductor, Inc.  
Corporate Headquarters  
2975 Stender Way  
Santa Clara, CA 95054  
Phone: 408.542.1000  
Fax: 408.542.1200  
www.catsemi.com  
Publication #: 1018  
Revison:  
Issue date:  
Type:  
I
10/13/06  
Final  

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