CAT25C64 Datasheet, PDF (9/9 Pages) Catalyst Semiconductor – 64K/128K-Bit SPI Serial CMOS E2PROM

Advance Information
CAT25C64/128
DESIGN CONSIDERATIONS
The CAT25C64/128 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
Figure 8. Page Write Instruction Timing
CS
CAT25C64/128 goes into a write disable mode. CS
must be set high after the proper number of clock cycles
to start an internal write cycle. Access to the array
during an internal write cycle is ignored and program-
ming is continued. On power up, SO is in a high
impedance.
012345678
21 22 23 24-31 32-39 ^{24+(N-1)x8-1..24+(N-1)x8 24+Nx8-1}
SK
OPCODE
SI
00 00 00 10
ADDRESS
DATA IN
Data Data Data
Byte 1 Byte 2 Byte 3
Data Byte N
7..1
0
HIGH IMPEDANCE
SO
Figure 9. HOLD Timing
CS
SCK
HOLD
SO
tCD
tHD
tHZ
tCD
tHD
HIGH IMPEDANCE
tLZ
ORDERING INFORMATION
Prefix Device #
CAT
25C64
Suffix
S
I
-1.8 _TE13
Optional
Company ID
Product
Number
25C64: 64K
25C128: 128K
Temperature Range
Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
A = Automotive (-40˚ to +105˚C)*
Tape & Reel
TE13: 2000/Reel
Package
P = PDIP
S = 8-Pin SOIC
S16 = 16-Pin SOIC
U20 = 20-Pin TSSOP
Operating Voltage
Blank = 2.5 to 6.0V
1.8 = 1.8 to 6.0V
* -40˚C to +125˚C is available upon request
Notes:
(1) The device used in the above example is a 25C64SI-1.8TE13 (SOIC, Industrial Temperature, 1.8 Volt to 6 Volt Operating Voltage,
Tape & Reel)
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Doc No. 25069-00 6/99 SPI-1