CS8151C Cherry Semiconductor Corporation, CS8151C Datasheet

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CS8151C

Manufacturer Part Number
CS8151C
Description
5V/ 100mA Low Dropout Linear Regulator with Watchdog/ RESET/ & Wake Up
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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Part Number:
CS8151C
Quantity:
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Rev. 3/17/99
RESET
Delay
The CS8151C is a precision 5V, 100mA
micro-power voltage regulator with
very low quiescent current (400µA typ-
ical at 200µA load). The 5V output is
accurate within ±1% and supplies 100
mA of load current with a typical
dropout voltage of 400mV.
Microprocessor control logic includes
Watchdog, Wake Up and
current and full microprocessor con-
trol makes the CS8151C ideal for use in
battery operated, microprocessor con-
trolled equipment.
The CS8151C Wake Up function brings
the microprocessor out of Sleep mode.
The microprocessor in turn, signals its
Wake Up status back to the CS8151C
by issuing a Watchdog signal.
The Watchdog logic function monitors
an input signal (WDI) from the micro-
processor. The CS8151C responds to
the falling edge of the Watchdog signal
which it expects at least once during
each wake-up period. When the cor-
rect Watchdog signal is received, a
unique combination of low quiescent
WDI
V
IN
5V, 100mA Low Dropout Linear Regulator
Falling Edge
V
Detector
OUT
Timing
Circuit
with Watchdog, RESET, & Wake Up
Current Source
(Circuit Bias)
RESET
Circuit
WATCHDOG
Circuit
RESET
Description
Reference
Bandgap
Shutdown
Shutdown
Thermal
Voltage
Block Diagram
. This
Over
+
-
falling edge is issued on the wake-up
signal line.
operates correctly to an output voltage
as low as 1V. A
in any of three situations. During
power up the
the output voltage is in regulation.
During operation if the output voltage
shifts below the regulation limits, the
until proper output voltage regulation
is restored. And finally, a
is issued if the regulator does not
receive a Watchdog signal within the
Wake Up period.
The
nal frequency, and Wake Up delay
time are all set by one external capaci-
tor C
The regulator is protected against
short circuit, over voltage, and thermal
runaway conditions. The device can
withstand 74 volt load dump tran-
sients, making it suitable for use in
automotive environments.
RESET
RESET
Error
Amplifier
WAKE UP
Circuit
RESET
CS8151C
Delay
Current Limit
Sense
is independent of V
toggles low and remains low
.
pulse width, Wake Up sig-
RESET
RESET
1
is held low until
signal is issued
RESET
V
OUT
IN
and
signal
V
WAKE UP
Sense
Gnd
OUT
2000 South County Trail, East Greenwich, RI 02818
WAKE UP
Tel: (401)885-3600 Fax: (401)885-5786
Cherry Semiconductor Corporation
Web Site: www.cherry-semi.com
RESET
5V ±1% / 100 mA Output
Voltage
Micropower Compatible
Control Functions:
Low Dropout Voltage:
400mV @ 100mA
Low Sleep Mode Quiescent
Current (400µA typ)
Protection Features:
Email: info@cherry-semi.com
Package Options
WDI
V
Wake Up
Watchdog
Thermal Shutdown
74V Load Dump
Reverse Transient (-50V)
IN
Short Circuit
RESET
Features
1
8 Lead PDIP
A
V
Gnd
N/C
Delay
¨
OUT
Company

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CS8151C Summary of contents

Page 1

... Watchdog, Wake Up and RESET . This unique combination of low quiescent current and full microprocessor con- trol makes the CS8151C ideal for use in battery operated, microprocessor con- trolled equipment. The CS8151C Wake Up function brings the microprocessor out of Sleep mode. The microprocessor in turn, signals its Wake Up status back to the CS8151C by issuing a Watchdog signal ...

Page 2

Power Dissipation.............................................................................................................................................Internally Limited Output Current (V , RESET , Wake Up) ...................................................................................................Internally Limited OUT Reverse Battery..........................................................................................................................................................................-15V Maximum Load Dump Transient .........................................................................................................................................+74V Maximum Negative Transient (t<2ms) .................................................................................................................................-50V ESD Susceptibility (Human Body Model)..............................................................................................................................2kV ESD Susceptibility (Machine Model).....................................................................................................................................200V Logic Inputs/Outputs ................................................................................................................................................-0.3V to +6V ...

Page 3

Electrical Characteristics 47µF (ESR < 8½), C PARAMETER Watchdog Input Threshold HIGH LOW Hysteresis Input Current Pulse Width Wake Up Output Wake Up Period Wake Up Duty Cycle nominal RESET HIGH to Wake Up Rising Delay Time ...

Page 4

Figure 1a. Power Up, Sleep Mode and Normal Operation V IN ______ RESET WAKE UP WDI V - OUT POR ______ RESET High to Wakeup Delay Time Power Up Figure 1b. Error Condition: Watchdog remains LOW and ...

Page 5

... Current Limit: Peak current that can be delivered to the output. Circuit Description Capacitor temperature coefficient and tolerance as well as the tolerance of the CS8151C must be taken into account in order to get the correct system tolerance for each parameter. WAKE UP . Delay WDI Figure 2 ...

Page 6

... OUT 0.1mF CS8151C RESET *C required if regulator is located 1 far from the power supply filter. **C 2 Figure 5. Test and application circuit showing output compensation. The capacitor value and type should be based on cost, availability, size and temperature constraints ...

Page 7

... R QJA are functions of the package type, heatsink and the inter- face between them. These values appear in heat sink data sheets of heat sink manufacturers. I OUT V OUT Application Diagram V OUT CS8151C WDI ______ RESET Gnd WAKE UP 7 Heat Sinks : QJA ...

Page 8

... PACKAGE DIMENSIONS IN mm (INCHES) Lead Count Max 8L PDIP 10.16 8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115) .356 (.014) .203 (.008) REF: JEDEC MS-001 Ordering Information Part Number Description CS8151CGN8 8 Lead PDIP Rev. 3/17/99 Package Specification Thermal Data D R Metric English QJC R Min Max Min QJA 9.02 .400 .355 Plastic DIP (N) ...

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