CAT25C32 Datasheet, PDF (9/9 Pages) Catalyst Semiconductor – 32K/64K-Bit SPI Serial CMOS E2PROM

Advanced Information
CAT25C32/64
DESIGN CONSIDERATIONS
The CAT25C32/64 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
CAT25C32/64 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
SO
Note: Dashed Line = mode (1, 1) – – – –
Figure 9. HOLD Timing
CS
tCD
SCK
tHD
HOLD
HIGH IMPEDANCE
tHD
SO
Note: Dashed Line= mode (1, 1) — — — —
ORDERING INFORMATION
Prefix Device #
CAT
25C64
tHZ
Suffix
S
HIGH IMPEDANCE
I
tCD
tLZ
-1.8 _TE13
Optional
Company ID
Product
Number
25C32: 32K
25C64: 64K
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 = 8-Pin PDIP
S = 8-Pin SOIC
U14= 14-Pin TSSOP
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. 25087 -00 8/99 SPI-1