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| X24F128 Datasheet, PDF (13/16 Pages) Xicor Inc. – 2-Wire SerialFlash with Block Lock TM Protection | |||
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X24F128
Bus Timing
SCL
SDA IN
tSU:STA
tF
tHIGH
tLOW
tHD:STA tHD:DAT
tSU:DAT
tR
tSU:STO
tAA
tDH
tBUF
SDA OUT
7012 ILL F15
Program Cycle Limits
Symbol
Parameter
Min.
Typ.(5)
Max.
Units
TWR(6)
Program Cycle Time
5
10
ms
7012 FRM T11
Notes: (5) Typical values are for TA = 25°C and nominal supply voltage (5V).
(6) tWR is the minimum cycle time to be allowed from the system perspective unless polling techniques are used. It is the maximum
time the device requires to automatically complete the nonvolatile write operation.
The program cycle time is the time from a valid stop condition of a program sequence to the end of the internal
erase/program cycle. During the program cycle, the X24F128 bus interface circuits are disabled, SDA is allowed to
remain HIGH, and the device does not respond to its slave address.
Bus Timing
SCL
SDA
8th BIT
WORD n
ACK
tWR
STOP
CONDITION
START
CONDITION
7012 ILL F16
Guidelines for Calculating Typical Values of
Bus Pull-Up Resistors
120
100
RMIN =
VCC MAX
IOL MIN
=1.8Kâ¦
80
RMAX
=
tR
CBUS
60
MAX.
RESISTANCE
40
20 MIN.
RESISTANCE
0
0 20 40 60
80 100 120
BUS CAPACITANCE (pF)
7012 ILL F17
SYMBOL TABLE
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Donât Care:
Changes
Allowed
N/A
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
13
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