CAT25C32/64
Advanced Information
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
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.
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
Data Data
Byte 2 Byte 3
OPCODE
Data
Byte 1
Data Byte N
0
0
0
0
0
0
1
0
ADDRESS
0
7..1
HIGH IMPEDANCE
SO
Note: Dashed Line = mode (1, 1) – – – –
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) — — — —
ORDERING INFORMATION
Prefix
Device #
25C64
Suffix
-1.8
S
CAT
TE13
I
Product
Temperature Range
Tape & Reel
TE13: 2000/Reel
Optional
Company ID
Number
Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
25C32: 32K
25C64: 64K
A = Automotive (-40˚ to +105˚C)*
Operating Voltage
Blank = 2.5 to 6.0V
1.8 = 1.8 to 6.0V
Package
P = 8-Pin PDIP
S = 8-Pin SOIC
U14= 14-Pin TSSOP
U20 = 20-Pin TSSOP
* -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)
Doc No. 25087 -00 8/99 SPI-1
9
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