G697L400T - Global Mixed-Mode Technology, Inc.

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

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



6µA Supply Current



Guaranteed Reset Valid to VCC = 0.8V



Power Supply Transient Immunity



5 pin SOT23-5 Packages

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 VCC supply voltage declines

below a preset threshold, with hysteresis keeping it

asserted for time delay determined by externally pro-

gramable time delay generator. after VCC 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 VCC. 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 VCC,

and the outputs are guaranteed to be in the correct

logic state for VCC 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 packages.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

G696H(L)xxxT1 -40°C ~ +105°C SOT23-5

G697LxxxT1 -40°C ~ +105°C SOT23-5

* xxx specifies the threshold voltage.

e.g. 263 denotes the 2.63V threshold voltage.

Pin Configuration Typical Operating Circuit

VCC

SOT23-5

G696/G697

RESET(RESET)

N.C.

GND

()is for G696H *G697 ONLY

RESET

INPUT

GND

µP

VCC

RESET

(RESET)

GND

G696/G697

VCC

Rpull-up*

VCC

SOT23-5

G696/G697

RESET(RESET)

N.C.

GND

()is for G696H *G697 ONLY

RESET

INPUT

GND

µP

VCC

RESET

(RESET)

GND

G696/G697

VCC

Rpull-up*

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

Absolute Maximum Ratings

Terminal Voltage (with respect to GND)

VCC.……………………………..…….…….-0.3V to +6.0V

Delay Capacitor Pin Voltage, VCD…..-0.3 to (VCC +0.3V)

RESET, RESET (push-pull)....…....-0.3V to (VCC + 0.3V)

RESET (open drain)...…......…................-0.3V to +6.0V

Input Current, VCC ............................…..…............20mA

Output Current, RESET, RESET ......…...............20mA

Continuous Power Dissipation (TA = +70°C)

5-Pin SOT23-5 (derate 2.17mW/°C above +70°C).174mW

Operating Temperature Range …...…..-40°C to +105°C

Storage Temperature Range..….…......-65°C to +150°C

Lead Temperature (soldering, 10s)...…...….…...+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause p’ermanent damage to the device. These are stress rat-

ings 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

(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V

for 463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

A = 0°C +70°C 0.8 5.5

VCC Range

A = -40°C +105°C 1 5.5 V

CC<5.5V, G69_ _463/438/400/330_ 6 10

Supply Current (SOT23-5) ICC

CC<3.6V, G69_ _308/293/263_ 5 8.5 µA

G69_ _463_ 4.537 4.63 4.722

G69_ _438_ 4.293 4.38 4.467

G69_ _400_ 3.92 4 4.08

G69_ _330_ 3.234 3.30 3.366

G69_ _308_ 3.019 3.08 3.141

G69_ _293_ 2.872 2.93 2.988

Reset Threshold VTH-

G69_ _263_ 2.578 2.63 2.682

G69__463_ 139 231 324

G69__438_ 132 219 306

G69__400_ 120 200 280

G69__330_ 99 165 231

G69__308_ 93 154 215

G69__293_ 88 146 205

Reset Threshold Hystersis VHYS

G69__263_ 79 131 184

Reset Threshold Tempco 70 ppm/°C

CC = 5V G69_ _ 463/438/400/330__ 3 3.3 3.9 V

CC =3.3V G69_ _308/293 1.9 2.3 2.7

CD Delay Pin Threshold Voltage VTDC

CC =3.0V G69_ 263_ 1.8 2.2 2.6

Delay Capacitor Pin Sink Current ICD

CC = 1.5V, VCD = 0.5V 3 5 mA

Delay Pull up Resistance RD 1 1.5 2.3

MΩ

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

Electrical Characteristics (Continued)

(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V

for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

RESET Output Current Low (push-pull active low,

and open-drain active-low, G696L and G697L) IOL VCC = 2.5V, V RESET = 0.5V 8 mA

VCC = 5V, V RESET = 4.5V,

G696L463/438/400/330 4.5

VCC = 3.3V, V RESET = 2.8V,

G696L308/293 3

RESET Output Current High (push-pull active

low, G696L) IOH

VCC = 3V, V RESET = 2.5V,

G696L263 2

VCC = 5V, VRESET = 0.5V,

G696H463/438/400/330 16

VCC = 3.3V, VRESET = 0.5V,

G696H308/293 12

RESET Output Current Low (push-pull active

high, G696H) IOL

VCC = 3V, VRESET = 0.5V,

G696H263 10

RESET Output Current High (push-pull active

high, G696H) IOH V

CC = 2.5V, VRESET = 2V 2 mA

RESET Open-Drain Output Leakage Current

(G697L)

CC > VTH, RESET deasserted 1 µA

Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.

Selector Guide

PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE TOP MARK

G697L463T_ 4.63 Open-Drain RESET 697Gx

G697L438T_ 4.38 Open-Drain RESET 697Fx

G697L400T_ 4.00 Open-Drain RESET 697Ex

G697L330T_ 3.30 Open-Drain RESET 697Dx

G697L308T_ 3.08 Open-Drain RESET 697Cx

G697L293T_ 2.93 Open-Drain RESET 697Bx

G697L263T_ 2.63 Open-Drain RESET 697Ax

G696H463T_ 4.63 Push-Pull RESET 696Lx

G696H438T_ 4.38 Push-Pull RESET 696Kx

G696H400T_ 4.00 Push-Pull RESET 696Jx

G696H330T_ 3.30 Push-Pull RESET 696Nx

G696H308T_ 3.08 Push-Pull RESET 696Ix

G696H293T_ 2.93 Push-Pull RESET 696Hx

G696H263T_ 2.63 Push-Pull RESET 696Gx

G696L463T_ 4.63 Push-Pull RESET 696Fx

G696L438T_ 4.38 Push-Pull RESET 696Ex

G696L400T_ 4.00 Push-Pull RESET 696Dx

G696L330T_ 3.30 Push-Pull RESET 696Mx

G696L308T_ 3.08 Push-Pull RESET 696Cx

G696L293T_ 2.93 Push-Pull RESET 696Bx

G696L263T_ 2.63 Push-Pull RESET 696Ax

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

Typical Operating Characteristics

(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V

for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.)

CD Delay Pin Sink Current vs. Voltage

32.41.81.20.60.40.20.05

VCD, Delay Pin Voltage (V)

ICD, CD DELAY PIN SINK CURRENT (mA)

VCC=3V

VCC=2.5

VCC=1.5V

Output Time Delay vs. Capacitance

0.1

100

1000

10000

0.0001 0.001 0.01 0.1 1

CD, Delay Pin Capacitance (uF)

Output Time Delay

Dela

between V

to out

ut chan

(

)

Delay between VCC<VTH to

output change (us)

Delay Resistance vs. Temperature

1.3

1.35

1.4

1.45

1.5

1.55

1.6

1.65

1.7

1.75

-40-30-20-10 0 102030405060708090

TA, Ambient Temperature (°C)

RD, Delay Resistance (MΩ)

Supply Current vs. VCC

0 0.6 1 1.2 1.5 1.8 2.1 2.4 2.7 3 3.2 3.3 3.4 3.5 3.7 3.9 4 4.5 5 5.5 6

VCC (V)

Supply Current (uA)

Reset Output Time Delay vs. Temperature

100

150

200

250

300

-40-30-20-10 0 10 2030405060708090

TA, Ambient Temperature (°C)

Output Time Delay (ms)

CD=0.1uF

Normalized Reset Threshold vs. Temperature

0.96

0.97

0.98

0.99

1.01

1.02

1.03

1.04

1.05

1.06

-40-30-20-100 10202730405060708090

TA, Ambient Temperature (°C)

Normalized Ormalized VTH+, VTH- (V)

VTH

Supply Curremt vs. Temperature (No Load)

-40-200 20406080

Temperature (°C)

Supply Current (uA)

VCC=5V

VCC=3.3V

VCC=2.5

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

Timing Diagram

Figure 1

Functional Diagram

Figure 2

() is for G696H

2VCC

VTH

RESET

3GND

2VCC

VTH

RESET

(RESET)

3GND

() is for G696H

2VCC

VTH

RESET

3GND

2VCC

VTH

RESET

(RESET)

3GND

VCC

VTH+

VTH-

VCC

VTH-

tD2

VCC, Pin 2

CD, Pin 5 0.675 VIN

Reset Output

(Active Low), Pin 1

Reset Output

(Active High), Pin 1

VCC

VTH+

VTH-

VCC

VTH-

tD2

VCC, Pin 2

CD, Pin 5 0.675 VIN

Reset Output

(Active Low), Pin 1

Reset Output

(Active High), Pin 1

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

Pin Description

PIN NAME FUNCTION

RESET (G696L/G697L) RESET Output remains low while VCC is below the reset threshold, and for delay time set by CD

after VCC rises above the reset threshold.

RESET (G696H) RESET Output remains high while VCC is below the reset threshold, and for delay time set by CD

after VCC rises above the reset threshold.

2 VCC Supply Voltage (+5V, +3.3V, +3.0V)

3 GND Ground

4 N.C. No Connection.

5 CD External Programmable time delay is set by the capacitor connect to CD pin.

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 VCC supply voltage declines

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

time delay set by capacitor connected to CD pin, after

VCC has risen above the high reset threshold VTH+

(VTH-+VHYS). 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 CD, and

internal pull up resistor RD. When the voltage at CD

pin exceeds the buffer threshold, typically 0.675 VCC,

the RESET output high (RESET output low). The

voltage detector and buffer have built-in hysterisis to

prevent erratic reset operation. The formula of time

delay is T (ms) ≅ 1685 CD (µF). Fig1 and Fig2 show a

timing deagram and a Functional Block.

Figure3. RESET Valid to VCC = Ground Circuit

Ensuring a Valid Reset Output Down to VCC = 0

When VCC 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; 100kΩ is large enough not to load

RESET and small enough to pull RESET to ground.

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

for the G697L if RESET is required to remain valid

for VCC < 0.8V.

Figure 4. Interfacing to µPs with Bidirectional Reset

I/O

Figure 5. G697L Open-Drain RESET Output Allows

Use with Multiple Supplies

VCC

RESET

GND

G696

100k

VCC

RESET

GND

G696

100k

RESET

INPUT

GND

µP

VCC

RESET

GND

G697

VCC

MOTOROLA

68HCXX

RPULL-UP

RESET

INPUT

GND

µP

VCC

RESET

GND

G697

VCC

MOTOROLA

68HCXX

RPULL-UP

RESET

INPUT

GND

5V SYSTEM

VCC

RESET

GND

G697

VCC

RPULL-UP

+3.3V

+5.0

RESET

INPUT

GND

5V SYSTEM

VCC VCC

RPULL-UP

+3.3V

+5.0V

RESET

INPUT

GND

5V SYSTEM

VCC

RESET

GND

G697

VCC

RPULL-UP

+3.3V

+5.0

RESET

INPUT

GND

5V SYSTEM

VCC VCC

RPULL-UP

+3.3V

+5.0V

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

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 bidi-

rectional reset pins, such as the Motorola 68HC11.

Connecting the µP supervisor’s RESET output di-

rectly 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 VCC 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 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.

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.

Ver: 1.1

Jul 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

G696/G697

Global Mixed-mode Technology Inc.

Package Information

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

DIMENSIONS IN MILLIMETERS

SYMBOLS MIN NOM MAX

A 1.00 1.10 1.30

A1 0.00 ----- 0.10

A2 0.70 0.80 0.90

b 0.35 0.40 0.50

C 0.10 0.15 0.25

D 2.70 2.90 3.10

E 1.40 1.60 1.80

e ----- 1.90(TYP) -----

e1 ----- 0.95 -----

H 2.60 2.80 3.00

L 0.37 ------ -----

θ1 1º 5º 9º

Taping Specification

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.

θ1

Feed Direction

SOT23-5 Package Orientation

Feed Direction

SOT23-5 Package Orientation