Datasheet > G693L263TCUF

G693L263TCUF

更新时间： 2024-02-20 20:11:28

品牌	Logo	应用领域
致新 - GMT		光电二极管
页数	文件大小	规格书
8页	155K
描述
Power Supply Support Circuit, Fixed, 1 Channel, +2.64VV, PDSO4, SOT-143, 4 PIN

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G693L263TCUF 技术参数

是否Rohs认证：	符合	生命周期：	Contact Manufacturer
包装说明：	TSOP, TO-253	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.71	Is Samacsys：	N
其他特性：	RESET THRESHOLD IS 2.64V	可调阈值：	NO
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT	JESD-30 代码：	R-PDSO-G4
长度：	2.92 mm	信道数量：	1
功能数量：	1	端子数量：	4
最高工作温度：	105 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSOP
封装等效代码：	TO-253	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE	电源：	3 V
认证状态：	Not Qualified	座面最大高度：	1.2 mm
子类别：	Power Management Circuits	最大供电电流 (Isup)：	0.022 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	1.2 V
标称供电电压 (Vsup)：	3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子节距：	1.92 mm	端子位置：	DUAL
阈值电压标称：	+2.64V	宽度：	1.3 mm
Base Number Matches：	1

G693L263TCUF 数据手册

Global Mixed-mode Technology Inc.

G692/G693

Applications Information

Negative-Going V_CCTransients

In addition to issuing a reset to the µP during power-up,

power-down, and brownout conditions, the G693L/

G692H/G692L are relatively immune to short-duration

negative-going V_CCtransients (glitches).

+5.0V

+3.3V

VCC

R_PULL-UP

5V SYSTEM

Figure1 shows typical transient duration vs. reset

comparator overdrive, for which the G693L/G692H/

G692L do not generate a reset pulse. The graph was

generated using a negative-going pulse applied to V_CC,

starting 0.5V 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_CCtransient 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, for the G69_ _463 and G69_ _438,

a V_CCtransient that goes 100mV below the reset

threshold and lasts 15µs or less will not cause a reset

pulse. A 0.1µF bypass capacitor mounted as close as

possible to the V_CCpin provides additional transient

immunity.

G693

RESET

INPUT

RESET

GND

Figure4. G693L Open-Drain RESET Output Allows

Use with Multiple Supplies

Interfacing to µPs with Bidirectional Reset Pins

Since the RESET output on the G693L is open drain,

this device interfaces easily with µPs that have bidirec-

tional reset pins, such as the Motorola 68HC11. Con-

necting the µP supervisor's RESET output directly to

the microcontroller’s (µC's) RESET pin with a single

pull-up resistor allows either device to assert reset

(Figure 3).

Ensuring a Valid Reset Output Down to V_CC= 0

When V_CCfalls below 1V, the G692 RESET output no

longer sinks current — it becomes an open circuit.

Therefore, high-impedance CMOS logic inputs con-

G693L Open-Drain RESET Output Allows Use with

Multiple Supplies

nected to RESET can drift to undetermined voltages.

This presents no problem in most applications since

most µP and other circuitry is inoperative with VCC be-

Generally, the pull-up connected to the G693L will

connect to the supply voltage that is being monitored at

the IC’s V_CCpin. 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 G693L's V_CCdecreases

below 1V, so does the IC’s ability to sink current at

low 1V. However, in applications where RESET must

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; 100kΩ is large enough not to load RESET

and small enough to pull RESET to ground.

RESET . Also, with any pull-up, RESET will be pulled

high as V_CCdecays toward 0. The voltage where this

occurs depends on the pull-up resistor value and the

voltage to which it is connected.

A 100kΩ pull-up resistor to VCC is also recommended

for the G693L if RESET is required to remain valid for

_CC< 1V.

Benefits of Highly Accurate Reset Threshold

Most µP 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.

V_CC

VCC

R_PULL-UP

µP

G693

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.

RESET MOTOROLA

RESET

INPUT

68HCXX

GND

The G69_ _463/G69_ _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.

Figure3. Interfacing to µPs with Bidirectional Reset I/O

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.7

May 19, 2006

1...3 4 567 8

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