- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385287 > G680 (Electronic Theatre Controls, Inc.) Tantalum Molded Capacitor; Capacitance: 100uF; Voltage: 16V; Case Size: 4.3x7.3 mm; Packaging: Tape & Reel PDF資料下載
參數(shù)資料
| 型號： | G680 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Tantalum Molded Capacitor; Capacitance: 100uF; Voltage: 16V; Case Size: 4.3x7.3 mm; Packaging: Tape & Reel |
| 中文描述： | 微處理器復位IC |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 101K |
| 代理商： | G680 |
Ver: 03 Preliminary
Jan 25 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G680/G681
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
High-Voltage Theshold (Input): Analog input to a comparator. When the level on this pin initially
rises above V
TH
, the delay generator cycles and the
RESET
remains low or RESET remains high
for a minimum of 140ms.
2
GND
Ground
Low-Voltage Threshold (Input): Analog input to a comparator. This is the voltage monitor input
assigned to detect a low voltage condition. When the level on this pin falls below V
TH
,
RESET
or
RESET is asserted and the condition is latched until V
HTH
> V
TH
.
Reset (Output): Push-pull output. This output is asserted and latched when V
LTH
<V
TH
, indicating
a low voltage condition. This state remains latched until V
HTH
> V
TH
. The polarity of this signal
(active-high or low) is determined by the part number suffix. See ordering information.
5
V
CC
Power Supply (Input): Independent supply input for internal circuitry.
Detailed Description
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The G681L/G680L/G680H assert reset to
prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a
reset signal whenever the threshold voltage declines
below V
TH
, keeping it asserted for at least 140ms after
threshold voltage input has risen above the reset
threshold. The G681L uses an open-drain output, and
the G680L/G680H have a push-pull output stage.
Connect a pull-up resistor on the G681L’s RESET out-
put to any supply between 0 and 5.5V.
FUNCTION
1
HTH
3
LTH
4
RESET
(RESET)
Battery voltage is monitored by a comparator via a
voltage divider network. The divided voltage is com-
pared to an internal reference voltage. When the volt-
age at the LTH input pin drops below the internal ref-
erence voltage, the output is asserted. At this point,
the voltage at HTH is assumed to be below the refer-
ence voltage.
Figure1. Maximum
Causing a Reset Pulse vs. Reset Com-
parator Overdrive
Transient
Duration
without
Applications Information
Negative-Going V
CC
Transients
In addition to issuing a reset to the μP during
power-up, power-down, and brownout conditions, the
G681L/G680H/G680L are relatively immune to short-
duration negative-going V
LTH
transients (glitches).
Figure1. shows typical transient duration vs. reset
comparator overdrive, for which the G681L/G680H/
G680L do not generate a reset pulse. The graph was
generated using a negative-going pulse applied to
V
LTH
, starting 0.1V above the actual reset threshold
and ending below it by the magnitude indicated (reset
comparator overdrive). The graph indicates the maxi-
mum pulse width a negative-going V
LTH
transient can
have without causing a reset pulse. As the magnitude
of the transient increases (goes farther below the reset
threshold), the maximum allowable pulse width de-
creases. Typically, a V
LTH
transient that goes 100mV
below the reset threshold and lasts 7μs or less will not
cause a reset pulse. A 0.1μF bypass capacitor
mounted as close as possible to the V
LTH
pin provides
additional transient immunity.
Programming the Thresholds
The low-voltage threshold is calculated using:
R1+R2+R3
R2+R3
V
BAT (Io)
= V
REF
The low-voltage threshold is calculated using:
R1+R2+R3
R3
V
BAT (hi)
= V
REF
where, for both equations:
V
BAT (hi)
= 1.245V
In order to provide the additional criteria needed to
solve for the resistor values, the resistors can be se-
lected such that they have a given total value, that is,
R1 + R2 + R3 = R
TOTAL
.
0
200
400
600
800
1000
1200
1400
1
1000
Reset Comparator Overdrive, Vth-Vcc (mV)
M
u
G69__308/293/263
G69__463/438/400
相關PDF資料 |
PDF描述 |
|---|---|
| G681 | Tantalum Molded Capacitor; Capacitance: 1.5uF; Voltage: 16V; Case Size: 3.2x1.6 mm; Packaging: Tape & Reel |
| G692 | 4-Pin UP Voltage Monitors with Manual Reset Input |
| G692H | 4-Pin UP Voltage Monitors with Manual Reset Input |
| G693 | 4-Pin UP Voltage Monitors with Manual Reset Input |
| G693L | 4-Pin UP Voltage Monitors with Manual Reset Input |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| G681 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor Reset IC |
| G684 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Microprocessor Reset IC |
| G6849 | 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:InGaAs PIN photodiode |
| G6849-01 | 制造商:HAMAMATSU 制造商全稱:Hamamatsu Corporation 功能描述:InGaAs PIN photodiode |
| G684H263T1U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Microprocessor Reset IC |
發(fā)布緊急采購，3分鐘左右您將得到回復。