- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄60265 > G684H330T1U (Global Mixed-mode Technology Inc.) Microprocessor Reset IC PDF資料下載
參數(shù)資料
| 型號(hào)： | G684H330T1U |
| 廠商： | Global Mixed-mode Technology Inc. |
| 元件分類： | 復(fù)位半導(dǎo)體 |
| 英文描述： | Microprocessor Reset IC |
| 中文描述： | 微處理器復(fù)位IC |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大?。?/td> | 181K |
| 代理商： | G684H330T1U |
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G684/G685
Global Mixed-mode Technology Inc.
Interfacing to Ps with Bidirectional Reset Pins
Since the RESET output on the G685L is open drain,
this device interfaces easily with Ps that have bidirec-
tional reset pins, such as the Motorola 68HC11. Connect-
ing the P supervisor’s RESET output directly to the
microcontroller’s (C’s) RESET pin with a single pull-up
resistor allows either device to assert reset (Figure 3).
Figure 3. Interfacing to Ps with Bidirectional Reset
I/O
G685L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the G685L will
connect to the supply voltage that is being monitored at
the IC’s VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the G685L’s VCC decreases
below 1V, so does the IC’s ability to sink current at
RESET . Also, with any pull-up, RESET will be pulled
high as VCC decays toward 0. The voltage where this
occurs depends on the pull-up resistor value and the
voltage to which it is connected.
Figure 4. G685L Open-Drain RESET Output Allows
Use with Multiple Supplies
Benefits of Highly Accurate Reset Threshold
Most P supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup-
ply voltages. This ensures a reset will not occur within
5% of the nominal supply, but will occur when the sup-
ply is 10% below nominal.
When using ICs rated at only the nominal supply ±5%,
this leaves a zone of uncertainty where the supply is
between 5% and 10% low, and where the reset may or
may not be asserted.
The G68_ _463/G68_ _308 use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below nominal.
RESET
INPUT
GND
P
V
CC
RESET
GND
G685
V
CC
V
CC
MOTOROLA
68HCXX
RPULL-UP
RESET
INPUT
GND
P
V
CC
RESET
GND
G685
V
CC
V
CC
MOTOROLA
68HCXX
RPULL-UP
RESET
INPUT
GND
5V SYSTEM
V
CC
RESET
GND
G685
V
CC
RPULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
V
CC
V
CC
RPULL-UP
+3.3V
+5.0V
RESET
INPUT
GND
5V SYSTEM
V
CC
RESET
GND
G685
V
CC
RPULL-UP
+3.3V
+5.0
RESET
INPUT
GND
5V SYSTEM
V
CC
V
CC
RPULL-UP
+3.3V
+5.0V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| G684H400T1U | Microprocessor Reset IC |
| G684H438T1U | Microprocessor Reset IC |
| G684H463T1U | Microprocessor Reset IC |
| G684L263T1U | Microprocessor Reset IC |
| G684L293T1U | Microprocessor Reset IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| G684H400T1U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Microprocessor Reset IC |
| G684H438T1U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Microprocessor Reset IC |
| G684H463T1U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Microprocessor Reset IC |
| G684L263T1U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Microprocessor Reset IC |
| G684L293T1U | 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(gòu)，3分鐘左右您將得到回復(fù)。