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X4283 데이터시트 PDF




Intersil Corporation에서 제조한 전자 부품 X4283은 전자 산업 및 응용 분야에서
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부품번호 X4283 기능
기능 (X4283 / X4285) CPU Supervisor
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X4283 데이터시트, 핀배열, 회로
®
Data Sheet
May 23, 2006
X4283, X4285
128K, 16K x 8 Bit
FN8121.1
CPU Supervisor with 128K EEPROM
FEATURES
• Selectable watchdog timer
• Low VCC detection and reset assertion
—Four standard reset threshold voltages
—Adjust low VCC reset threshold voltage using
special programming sequence
—Reset signal valid to VCC = 1V
• Low power CMOS
—<20µA max standby current, watchdog on
—<1µA standby current, watchdog OFF
—3mA active current
• 128Kbits of EEPROM
—64 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512
bytes of EEPROM array with programmable
Block Lockprotection
• 400kHz 2-wire interface
www.DataSheet4U.com 2.7V to 5.5V power supply operation
• Available packages
—8 Ld SOIC
—8 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)
BLOCK DIAGRAM
DESCRIPTION
The X4283, X4285 combines four popular functions,
Power-on Reset Control, Watchdog Timer, Supply
Voltage Supervision, and Block Lock protect serial
EEPROM memory in one package. This combination
lowers system cost, reduces board space require-
ments, and increases reliability.
Applying power to the device activates the power-on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable
time out interval, the device activates the
RESET/RESET signal. The user selects the interval
from three preset values. Once selected, the interval
does not change, even after cycling the power.
The device’s low VCC detection circuitry protects the
user’s system from low voltage conditions, resetting
the system when VCC falls below the set minimum VCC
trip point. RESET/RESET is asserted until VCC returns
to proper operating level and stabilizes. Four industry
standard Vtrip thresholds are available, however, Inter-
sil’s unique circuits allow the threshold to be repro-
grammed to meet custom requirements or to fine-tune
the threshold for applications requiring higher precision.
WP
SDA
SCL
S0
S1
Watchdog Transition
Detector
Data
Register
Command
Decode &
Control
Logic
VCC Threshold
Reset logic
Protect Logic
Status
Register
EEPROM Array
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
RESET (X4283)
RESET (X4285)
Power-on and
VCC
VTRIP
+
-
Low Voltage
Reset
Generation
Kb=Kilobyte
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.




X4283 pdf, 반도체, 판매, 대치품
X4283, X4285
Ordering Information (Continued)
PART NUMBER
RESET
(ACTIVE LOW)
PART
MARKING
PART NUMBER
RESET
(ACTIVE HIGH)
PART VCC RANGE VTRIP RANGE TEMP
MARKING
(V)
(V) RANGE (°C)
PACKAGE
PKG.
DWG #
X4283V8IZ (Note) 4283 IZ X4285V8IZ (Note) 4285 IZ
4.5 to 5.5
4.5 to 4.75
-40 to +85 8 Ld TSSOP
M8.173
(4.4mm) (Pb-free)
X4283S8-4.5A
X4283 AL X4285S8-4.5A X4285 AL
0 to 70
8 Ld SOIC
(150 mil)
MDP0027
X4283S8Z-4.5A
(Note)
X4283 ZAL X4285S8Z-4.5A X4285 ZAL
(Note)
0 to 70 8 Ld SOIC
MDP0027
(150 mil) (Pb-free)
X4283S8I-4.5A
X4283 AM X4285S8I-4.5A X4285 AM
-40 to +85 8 Ld SOIC
(150 mil)
MDP0027
X4283S8IZ-4.5A
(Note)
X4283 ZAM X4285S8IZ-4.5A X4285 ZAM
(Note)
-40 to +85 8 Ld SOIC
MDP0027
(150 mil) (Pb-free)
X4283V8-4.5A
4283 AL X4285V8-4.5A 4285 AL
0 to 70 8 Ld TSSOP
(4.4mm)
M8.173
X4283V8Z-4.5A
(Note)
4283 ALZ X4285V8Z-4.5A 4285 ALZ
(Note)
0 to 70 8 Ld TSSOP
M8.173
(4.4mm) (Pb-free)
X4283V8I-4.5A
4283 AM X4285V8I-4.5A 4285 AM
-40 to +85 8 Ld TSSOP
(4.4mm)
M8.173
X4283V8IZ-4.5A
(Note)
4283 AMZ X4285V8IZ-4.5A 4285 AMZ
(Note)
-40 to +85 8 Ld TSSOP
M8.173
(4.4mm) (Pb-free)
*Add "T1" suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
4 FN8121.1
May 23, 2006

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X4283 전자부품, 판매, 대치품
Figure 4. VTRIP Programming Sequence
X4283, X4285
VTRIP Programming
Execute
RSeesqeut eVnTcReIP
Set VCC = VCC Applied =
Desired VTRIP
New VCC Applied =
Old VCC Applied + Error
Execute
SSeeqt uVeTnRcIPe
Apply 5V to VCC
Decrement VCC
(VCC = VCC - 50mV)
New VCC Applied =
Old VCC Applied - Error
Execute
Reset VTRIP
Sequence
NO RESET pin
goes active?
YES
Error –Emax
Emax = Maximum Allowed VTRIP Error
Measured VTRIP -
Desired VTRIP
Error Emax
–Emax < Error < Emax
DONE
Control Register
The Control Register provides the user a mechanism
for changing the Block Lock and Watchdog Timer set-
tings. The Block Lock and Watchdog Timer bits are
nonvolatile and do not change when power is
removed.
The Control Register is accessed at address FFFFh. It
can only be modified by performing a byte write opera-
tion directly to the address of the register and only one
data byte is allowed for each register write operation.
Prior to writing to the Control Register, the WEL and
RWEL bits must be set using a two step process, with
the whole sequence requiring 3 steps. See "Writing to
the Control Register" below.
The user must issue a stop after sending this byte to
the register to initiate the nonvolatile cycle that stores
WD1, WD0, BP2, BP1, and BP0. The X4283, X4285
will not acknowledge any data bytes written after the
first byte is entered.
7 FN8121.1
May 23, 2006

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