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参数资料
| 型号： | G684 |
| 厂商： | Global Mixed-mode Technology Inc. |
| 元件分类： | 复位半导体 |
| 英文描述： | Microprocessor Reset IC |
| 中文描述： | 微处理器复位IC |
| 文件页数： | 5/7页 |
| 文件大小： | 181K |
| 代理商： | G684 |
Ver: 1.2
Jun 03, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G684/G685
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
FUNCTION
1
N.C.
No Connection.
2,3
GND
Ground
RESET
(G684L/G685L)
RESET
Output remains low while VCC is below the reset threshold, and for 2ms typical after VCC
rises above the reset threshold.
4
RESET (G684H)
RESET Output remains high while VCC is below the reset threshold, and for 2ms typical after VCC
rises above the reset threshold.
5
VCC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor’s (P’s) reset input starts the P in a
known state. The G685L/G684L/G684H assert reset to
prevent
code-execution
errors
during
power-up,
power-down, or brownout conditions. They assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold (VTH-), VCC has risen above
the high reset threshold VTH+ (VTH-+VHYS). The G685L
uses an open-drain output, and the G684L/G684H
have a push-pull output stage. Connect a pull-up resistor
on the G685L’s RESET output to any supply between 0
and 5.5V.
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 0.8V, the G684 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most P and other circuitry is inoperative with VCC be-
low 0.8V. However, in applications where RESET ust
be valid down to 0V, adding a pull-down resistor to
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1’s value is
not critical; 100k
is large enough not to load RESET
and small enough to pull RESET to ground.
A 100k
pull-up resistor to VCC is also recommended
for the G685L if RESET is required to remain valid for
VCC < 0.8V.
Figure2. RESET Valid to VCC = Ground Circuit
V
CC
RESET
GND
G684
R1
100k
V
CC
RESET
GND
G684
R1
100k
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