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CAT25C128U14A-1.8TE13 Datasheet(Hoja de datos) 8 Page - Catalyst Semiconductor

No. de Pieza. CAT25C128U14A-1.8TE13
Descripción  128K/256K-Bit SPI Serial CMOS E2PROM
Descarga  11 Pages
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Fabricante  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
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8
CAT25C128/256
Doc. No. 25088-00 1/01
Figure 5. RDSR Timing
Byte Write
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 most significant bit is don't care for
25C256 and the two most significant bits are don't care
for the 25C128), and then the data to be written. Pro-
gramming will start after the
CS is brought high. The low
to high transition of the
CS pin must occur during the
SCK low time, immediately after clocking the least
significant bit of the data. Figure 6 illustrates byte write
sequence.
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.
The
CS must be brought high after the WREN instruction
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
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.
Figure 4. Read Instruction Timing
SK
SI
SO
0000001
1
BYTE ADDRESS*
0123456789
10
20
21
22
23
24
25
26
27
28
29
30
7
6
5
4
3
2
1
0
*Please check the instruction set table for address
CS
OPCODE
DATA OUT
MSB
HIGH IMPEDANCE
0
1
2
345
67
8
10
911
12
13
14
SCK
SI
DATA OUT
MSB
HIGH IMPEDANCE
OPCODE
SO
7
6
5
4
3
2
1
0
CS
00
0
00
1
0
1
Note: Dashed Line= mode (1, 1) — — — —
Note: Dashed Line= mode (1, 1) — — — —




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