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CA3277 Datasheet(PDF) 1 Page - Intersil Corporation

Part No. CA3277
Description  Dual 5V Regulator with Serial Data Buffer Interface for Microcontroller Applications
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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CA3277 Datasheet(HTML) 1 Page - Intersil Corporation

   
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
407-727-9207
| Copyright
© Intersil Corporation 1999
CA3277
Dual 5V Regulator with Serial Data Buffer
Interface for Microcontroller Applications
Description
The CA3277 is a Dual 5V Voltage Regulator IC intended for micro-
processor and logic controller applications. It is supplied with fea-
tures that are commonly specified for sequentially controlled
shutdown and startup requirements of microcontrollers. Over-volt-
age shutdown, short circuit current limiting and thermal shutdown
features are provided for protection in the harsh environmental appli-
cations of industrial and automotive systems. The CA3277 functions
are complementary to the needs of microcontroller and memory cir-
cuits, providing for sustained memory with a 5V standby output.
The Ignition Comparator senses the voltage level at the IGN IN input
and provides a 5V logic switched output (supply sourced
from
OUT1). The Ignition Output, IGN OUT can be used to signal a sys-
tem microcontroller which can respond with a logic switched output
to the CA3277 ENABLE input control for OUT2. The OUT1 +5V
Standby Supply of the regulator is normally used as a power supply
for microcontroller/memory circuits to preserve stored data when in
the standby mode.To allow for maximum heat transfer from the chip,
the four center leads are directly connected to the die mounting pad.
Refer to AN9302 for further information on CA3277 circuit Applica-
tions.
Ordering Information
PART NUMBER
TEMPERATURE RANGE
PACKAGE
CA3277E
-40oC to +85oC
16 Lead Plastic DIP
Features
• Dual 5V Regulator
-VOUT1 at 5V 100mA - Standby
-VOUT2 at 5V 100mA - Enabled
- Regulation Range 6V to 18V
- Bandgap Voltage References
• Low Quiescent Idle Current, 500
µA Typ.
• Over-Voltage Shutdown Protection, 20.5V Typ.
• Reverse Battery Protection, -26V Max.
• Thermal Shutdown Protection
• Short Circuit Current Limiting
• Low Input P.S. Flag and Delayed Reset Control
• Low Voltage Shutdown Control, Ouput1
• Ignition Comparator Logic Level Control
• Data Comparator and 100X Current Mult. Used
as Input/Output Buffers for Remote Serial Data
Communication
Applications
• Automotive 5V Regulators and Data Buffers
• Industrial Controller Remote System
• Microcontroller and Memory Power Supply
• Radio, TV, CATV, Consumer Applications
File Number
2792.4
April 1994
Pinout
CA3277 (PDIP)
TOP VIEW
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
IGN
ENABLE
GND
GND
IGN OUT
CUR IN
CUR OUT
OUT2
BATT
OUT1
DATA IN
GND
GND
DATA OUT
RESET
CRST
Functional Block Diagram
4, 5 AND
12, 13
OUT1 REG.
DR. CNTRL
BANDGAP
VOLTAGE
REF
2
RESET
CRST
8
7
BATT
1
OVER-
SHTDWN
15
OVER-
SHTDWN
ENABLE 14
CURRENT
MULTIPLIER
IGN
11
OUT
10
CUR
OUT
9
16
IGN IN
3
DATA IN
6
DATA
OUT
GND
-
+
(OUTPUT2)
TEMP
OUT2 REG.
DR. CNTRL
OUT1
OUT2
LOW
VOLTAGE
SHTDWN
VOLTAGE
VBATT -2.9V
6V
1.2V
+5V
(STANDBY)
+5V
(ENABLE)
CUR
IN
-
+
IN
-
+
-
+
-
+
-
+


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