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參數資料
| 型號： | CS8140 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | 5V, 500mA Linear Regulator with ENABLE, , and Watchdog RESET |
| 中文描述： | 5V的，500mA的線性穩壓器具有使能，以及看門狗復位 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 214K |
| 代理商： | CS8140 |
The CS8140 is a 5V Watchdog
Regulator with protection circuitry and
three logic control functions that allow
a microprocessor to control its own
power supply. The CS8140 is designed
for use in automotive, switch mode
power supply post regulator, and bat-
tery powered systems.
Basic regulator performance character-
istics include a low noise, low drift, 5V
± 4% precision output voltage with low
dropout voltage (1.25V @ I
OUT
= 500mA)
and low quiescent current (7mA @ I
OUT
= 500mA). On board short circuit, ther-
mal, and overvoltage protection make it
possible to use this regulator in particu-
larly harsh operating environments.
The Watchdog logic function monitors
an input signal (WDI) from the micro-
processor or other signal source. When
the signal frequency moves outside
externally programmable window lim-
its, a
signal is generated
(
). An external capacitor
(C
DELAY
) programs the watchdog win-
dow frequency limits as well as the
power on reset (POR) and
delay.
The
function is activated by any
of three conditions: the watchdog sig-
nal moves outside of its preset limits;
the output voltage drops out of regula-
tion by more than 4.5%; or the IC is in
its power up sequence. The
nal is independent of V
IN
and reliable
down to V
OUT
= 1V.
In conjunction with the Watchdog, the
ENABLE function controls the regula-
tors power consumption. The CS8140s
output stage and its attendant circuitry
are enabled by setting the ENABLE
lead high. The regulator goes into sleep
mode (I
OUT
= 250μA) when the
ENABLE lead goes low and the watch-
dog signal moves outside its preset
window limits. This unique combina-
tion of control functions in the CS8140
gives the microprocessor control over
its own power down sequence: i.e. it
gives the microprocessor the flexibility
to perform housekeeping functions
before it powers down.
sig-
The CS8141 has the same features as the
CS8140, except that the CS8141 only
responds to input signals (WDI) which
are below the preset watchdog frequen-
cy threshold.
RESET
RESET
RESET
RESET
RESET
1
Features
Gnd
WDI
ENABLE
VIN
VOUT
Delay
Overvoltage
Overtemperature
Reference
& Bias
Short Circuit
Watchdog
Undervoltage
Regulation
RESET
Control Logic
ENABLE
RESET
Delay
Sense
*NOTE: shorted together
on 7 Lead TO-220
*
I
5V ± 4%, 500mA Output
Voltage
μP Compatible Control
Functions
Watchdog
RESET
I
ENABLE
Low Dropout Voltage
(1.25V @ 500mA)
Low Quiescent Current
(7mA @ 500mA)
Low Noise, Low Drift
Low Current SLEEP Mode
(I
Q
= 250μA)
Fault Protection
Thermal Shutdown
Short Circuit
60V Peak Transient
Voltage
I
I
I
I
I
Package Options
7 Lead TO-220
Tab (Gnd)
14 Lead PDIP
24 Lead SOIC Wide
C
5V, 500mA Linear Regulator with
ENABLE,
RESET
Description
, and Watchdog
1
1
Delay
V
OUT
Sense
WDI
NC
NC
NC
NC
NC
V
IN
ENABLE
RESET
Gnd
NC
NC
NC
Gnd
NC
NC
NC
NC
NC
NC
NC
CS8140/1
Block Diagram
1
Delay
V
OUT
Sense
WDI
NC
NC
NC
NC
NC
Gnd
V
IN
ENABLE
RESET
NC
1 V
IN
2 ENABLE
3
4 Gnd
5 Delay
6 WDI
7 V
OUT
RESET
A
Company
¨
Rev. 2/23/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
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| CS8140/1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V 500mA Linear Regulator with ENABLE RESET and Watchdog |
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