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CAT1640ZD2I45GT3 Datasheet(PDF) 6 Page - ON Semiconductor

No. de pieza CAT1640ZD2I45GT3
Descripción Electrónicos  Supervisory Circuits with I2C Serial 64K CMOS EEPROM
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
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CAT1640ZD2I45GT3 Datasheet(HTML) 6 Page - ON Semiconductor

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CAT1640, CAT1641
Doc. No. MD-3012, Rev. D
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice.
When
RESET I/O is driven to the active state, the 200
msec timer will begin to time the reset interval. If external
reset is shorter than 200 ms, Reset outputs will remain
active at least 200 ms.
Glitches shorter than 100 ns on
RESET input will not
generate a reset pulse.
Hardware Data Protection
The CAT1640/41 family has been designed to solve
many of the data corruption issues that have long been
associated with serial EEPROMs. Data corruption occurs
when incorrect data is stored in a memory location which
is assumed to hold correct data.
Whenever the device is in a Reset condition, the embedded
EEPROM is disabled for all operations, including write
operations. If the Reset output is active, in progress
communications to the EEPROM are aborted and no new
communications are allowed. In this condition an internal
write cycle to the memory can not be started, but an in
progress internal non-volatile memory write cycle can not
be aborted. An internal write cycle initiated before the
Reset condition can be successfully finished if there is
enough time (5ms) before VCC reaches the minimum
value of 2V.
DEVICE OPERATION
Reset Controller Description
The CAT1640/41 precision RESET controllers ensure
correct system operation during brownout and power
up/down conditions. They are configured with open-
drain
RESET/RESET outputs.
During power-up, the
RESET/RESET output remains
active until VCC reaches the VTH threshold and will
continue driving the outputs for approximately 200ms
(tPURST) after reaching VTH. After the tPURST timeout
interval, the device will cease to drive the reset output.
At this point the reset output will be pulled up or down by
their respective pull up/down resistors.
During power-down, the
RESET/RESET output will be
active when VCC falls below VTH. The RESET/RESET
output will be valid so long as VCC is >1.0V (VRVALID).
The device is designed to ignore the fast negative going
VCC transient pulses (glitches).
Reset output timing is shown in Figure 1.
Manual Reset Operation
The
RESET pin can operate as reset output and manual
reset input. The input is edge triggered; that is, the
RESET input will initiate a reset timeout after detecting
a high to low transition.
Figure 1. RESET/RESET Output Timing
GLITCH
t
VCC
PURST
t
PURST
t
RPD
t
RVALID
V
V
TH
RESET
RESET
RPD
t


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