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G696H308TOU中文资料

Microprocessor Reset IC

Features

Precision Monitoring of +3V, +3.3V, and +5V

Power-Supply Voltages

Fully Specified Over Temperature Available in Three Output Configurations

Push-Pull RESET Output (G696L) Push-Pull RESET Output (G696H) Open-Drain RESET Output (G697L)

Externally Programmable Time Delay Generator 14μA Supply Current

Guaranteed Reset Valid to V CC = 0.8V Power Supply Transient Immunity

5 pin SOT-23-5 or TSOT-23-5 Packages 2% Threshold Accuracy

Applications

Computers Controllers

Intelligent Instruments

Critical μP and μC Power Monitoring Portable / Battery-Powered Equipment Automotive

General Description

The G696/G697 are microprocessor (μP) supervisory circuits used to monitor the power supplies in μP and digital systems. They provide excellent circuit reliability and low cost and adjustments when used with +5V, +3.3V, +3.0V- powered circuits.

These circuits perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold, with hysteresis keeping it asserted for time delay determined by externally pro-grammable time delay generator after V CC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.

The G697L has an open-drain output stage, while the G696 have push-pull outputs. The G697L ’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than V CC . The G696L have an active-low RESET output, while the G696H has an active-high RESET output. The reset com-parator is designed to ignore fast transients on V CC , and the outputs are guaranteed to be in the correct logic state for V CC down to 0.8V.

Low supply current makes the G696/G697 ideal for use in portable equipment. The G696/G697 are avail-able in 5-pin SOT23-5 or TSOT-23-5 packages.

Pin Configuration Typical Application Circuit

(RESET)

RESET VCC

SOT-23-5/TSOT-23-5

GND

()is for G696H

*G697 ONLY

V C

Ordering Information

ORDER NUMBER ORDER NUMBER

(Pb free)

TEMP. RANGE PACKAGE

G696HxxxT1U G696HxxxT1Uf -40°C ~ +105°C SOT-23-5 G696LxxxT1U G696LxxxT1Uf -40°C ~ +105°C SOT-23-5 G697LxxxT1U G697LxxxT1Uf -40°C ~ +105°C SOT-23-5 G696HxxxTOU G696HxxxTOUf -40°C ~ +105°C TSOT-23-5 G696LxxxTOU G696LxxxTOUf -40°C ~ +105°C TSOT-23-5 G697LxxxTOU G697LxxxTOUf -40°C ~ +105°C TSOT-23-5 Note: T1: SOT-23-5 TO: TSOT-23-5

U: Tape & Reel

* xxx specifies the threshold voltage.

e.g. 263 denotes the 2.64V threshold voltage.

Selector Guide

TO: TSOT-23-5

Absolute Maximum Ratings

Terminal Voltage (with respect to GND)

V CC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.0V Delay Capacitor Pin Voltage, V CD. . -0.3 to (V CC +0.3V) RESET,RESET(push-pull) . . . . .-0.3V to (V CC + 0.3V) RESET(open drain). . . . . . . . . . . . . . . -0.3V to +6.0V Input Current, V CC . . . . . . . . . . . . . . . . . . . . . . . 20mA Output Current, RESET, RESET. . . . . . . . . . . 20mA Operating Temperature Range. . . . . .-40°C to +105°C Storage Temperature Range . . . . . . .-65°C to +150°C Reflow Temperature (soldering, 10sec) . . . .. . . 260°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Electrical Characteristics

(V CC = full range, T A = -40°C to +105°C, unless otherwise noted. Typical values are at T A = +25°C, V CC = 5V for 463/438/400/330 versions, V CC= 3.3V for 308/293 versions, and V CC = 3V for 263/250 version.) (Note 1)

Typical Operating Characteristics

(V CC = full range, T A = -40°C to +105°C, unless otherwise noted. Typical values are at T A = +25°C, V CC = 5V for 463/438/400/330 versions, V CC = 3.3V for 308/293 versions, and V CC = 3V for 263/250 version.)

0.96

0.970.980.9911.011.021.031.041.05

1.06-40-30-20-10

202730405060708090

T A , Ambient Temperature (°C)

N o r m a l i z e d O r m a l i z e d V T H + , V T H -

(V )

Supply Current vs. V

123456

7800.61 1.21.51.82.12.42.73 3.23.33.43.53.73.94 4.55 5.56

V CC (V)

S u p p l y C u r r e n t (μA )

Normalized Reset Threshold vs. Temperature

0.1

100

1000

10000

0.0001

0.001

0.01

0.1

CD, Delay P in Capacitance (μF)

O u t p u t T i m e D e l a y (μS )

Output Time Delay vs. Capacitance

(V CC

0.1

1101001000

10000

0.0001

0.001

0.01

0.1

CD, Delay P in Capacitance (μF)

O u t p u t T i m e D e l a y (m S )

012345

67-40

-200

20406080

Temperature (°C)

S u p p l y C u r r e n t (μA )

Supply Curremt vs. Temperature (No Load)

Output Time Delay vs. Capacitance

(VCC>VTH to output change)

Typical Operating Characteristics (continued)

Recommended Minimum Footprint 050100

150200

250300

-40-30-20-100102030405060708090

T A

, Ambient Temperature (°C)O u t p u t T i m e D e l a

y (m s )

Reset Output Time Delay vs. Temperature SOT-23-5 / TSOT-23-5

Timing Diagram

Figure 1

Functional Diagram

Figure 2

V C C V TH +V TH -

V C C

V TH -V TH -0V

t D 2

V C C , P in 2

C D , P in 5

0.675 V IN

R eset O utput (A ctive Low ), P in 1

R eset O utput (A ctive H igh), P in 1

() is for G696H

Pin Description

Detailed Description

A microprocessor ’s (μP ’s) reset input starts the μP in a known state. The G697L/G696L/G696H assert reset to prevent code-execution errors during power-up,

power-down, or brownout conditions. They assert a

reset signal whenever the V CC supply voltage declines

below a preset threshold (V TH-), keeping it asserted for

time delay set by capacitor connected to C D pin, after V CC has risen above the high reset threshold V TH+

(V TH-+V HYS ). The G697L uses an open-drain output,

and the G696L/G696H have a push-pull output stage.

Connect a pull-up resistor on the G697L ’s RESET out-put to any supply between 0 and 5.5V. The time delay is set by external capacitor C D , and internal pull up current I CD . When the voltage at C D pin exceeds the buffer threshold, typically 1.25V, the RESET output high (RESET output low). The volt-age detector and buffer have built-in hysterisis to prevent erratic reset operation. The formula of time delay is T (ms) ? 1685 C D (μF). Fig1 and Fig2 show a timing deagram and a Functional Block.

Figure3. RESET Valid to V CC = Ground Circuit

Ensuring a Valid Reset Output Down to V

CC = 0

When V CC falls below 0.8V, the G696 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 μP and other circuitry is inoperative with VCC below 0.8V. 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 4). R1’s value

is not critical ; 100k Ω is large enough not to load

RESET and small enough to pull RESET to ground. A 100k Ω pull-up resistor to V CC is also recommended for the G697L if RESET is required to remain valid

for V CC < 0.8V.

Figure 4. Interfacing to μPs with Bidirectional Re-set I/O

Figure 5. G697L Open-Drain RESET Output Allows

Use with Multiple Supplies

Interfacing to μPs with Bidirectional Reset Pins Since the RESET output on the G697L 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 5).

G697L Open-Drain RESET Output Allows Use with Multiple Supplies

Generally, the pull-up connected to the G697L will connect to the supply voltage that is being monitored at the IC’s V CC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 6). Note that as the G697L’s V CC 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.

Benefits of Highly Accurate Reset Threshold

Most μP supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply 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 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.

Package Information

SOT-23-5 (T1) Package

Note:

1. Package body sizes exclude mold flash protrusions or gate burrs

2. Tolerance ±0.1000 mm (4mil) unless otherwise specified

3. Coplanarity: 0.1000mm

4. Dimension L is measured in gage plane

DIMENSION IN MM DIMENSION IN INCH

SYMBOL

MIN. NOM. MAX. MIN. NOM. MAX.

A 1.00 1.10 1.30 0.039 0.043 0.051 A1 0.00 ----- 0.10 0.000 ----- 0.004

A2 0.70 0.80 0.90 0.028 0.031 0.035 b 0.35 0.40 0.50 0.014 0.016 0.020 C 0.10 0.15 0.25 0.004 0.006 0.010 D 2.70 2.90 3.10 0.106 0.114 0.122 E 1.40 1.60 1.80 0.055 0.063

0.071 e ----- 1.90(TYP) ----- ----- 0.075(TYP) ----- e1 ----- 0.95 ----- ----- 0.037 ----- H 2.60 2.80 3.00 0.102 0.110 0.118 L 0.37 ------ ----- 0.015 ----- ----- θ1 1° 5° 9° 1° 5° 9°

TSOT-23-5 (TO) Package

Note:

6. Package body sizes exclude mold flash protrusions or gate burrs

7. Tolerance ±0.1000 mm (4mil) unless otherwise specified

8. Coplanarity: 0.1000mm

9. Dimension L is measured in gage plane

DIMENSION IN MM DIMENSION IN INCH

SYMBOL

MIN. NOM. MAX. MIN. NOM. MAX.

A ----- ----- 1.00 ----- ----- 0.039 A1 0.00 ----- 0.10 0.000 ----- 0.004

A2 ----- ----- 0.90 ----- ----- 0.035 b 0.35 0.40 0.50 0.014 0.016 0.020 C 0.10 0.15 0.25 0.004 0.006 0.010 D 2.70 2.90 3.10 0.106 0.114 0.122 E 1.40 1.60 1.80 0.055 0.063

0.071 e ----- 1.90(TYP) ----- ----- 0.075(TYP) ----- e1 ----- 0.95 ----- ----- 0.037 ----- H 2.60 2.80 3.00 0.102 0.110 0.118 L 0.37 ------ ----- 0.015 ----- ----- θ1 1° 5° 9° 1° 5° 9°

Taping Specification

PACKAGE Q ’TY/REEL

SOT-23-5 3,000 ea

TSOT-23-5 3,000 ea

GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.

Feed Direction

TSOT-23-5、SOT-23-5 Package Orientation