GMT G699L438T1U Microprocessor reset ic Datasheet

Global Mixed-mode Technology Inc.
G698/G699
Microprocessor Reset IC
Features
General Description
„Precision Monitoring of +3V, +3.3V, and +5V
The G698/G699 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.
Power-Supply Voltages
„Fully Specified Over Temperature
„Available in Three Output Configurations
Push-Pull RESET Output (G698L)
Push-Pull RESET Output (G698H)
Open-Drain RESET Output (G699L)
„Externally Programmable Time Delay Generator
„14µA Supply Current
„Guaranteed Reset Valid to VCC = 0.8V
„Power Supply Transient Immunity
„5 pin SOT23-5 Packages
„2% Threshold Accuracy
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 programmable 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 G699L has an open-drain output stage, while the
G698 have push-pull outputs. The G699L’s open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. The G698L
have an active-low RESET output, while the G698H
has an active-high RESET output. The reset comparator 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.
Applications
„Computers
„Controllers
„Intelligent Instruments
„Critical µP and µC Power Monitoring
„Portable / Battery-Powered Equipment
„Automotive
Low supply current makes the G698/G699 ideal for
use in portable equipment. The G698/G699 are available in 5-pin SOT23-5 packages.
Ordering Information
ORDER NUMBER TEMP. RANGE
G698H(L)xxxT1U
G699LxxxT1U
-40°C ~ +105°C
-40°C ~ +105°C
PACKAGE
SOT23-5
SOT23-5
Note:T1 : SOT23-5
U : Tape & Reel
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
Pin Configuration
Typical Application Circuit
VCC
CD
1
5
VCC
VCC
VCC
Rpull-up*
GND
2
G698/G699
G698/G699
CD
GND
3
4
RESET
(RESET)
RESET
(RESET)
GND
µP
RESET
INPUT
GND
CD
SOT23-5
()is for G698H
*G699 ONLY
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Ver: 1.3
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
G698/G699
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).….….………+260°C
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
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
(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
VCC Range
Supply Current (SOT23-5)
ICC
Reset Threshold
VTH-
Reset Threshold Hysterisis
Reset Threshold Tempco
CD Delay Pin Threshold Voltage
Delay Capacitor Pin Sink Current
Delay Capacitor Pin Source Current
VHYS
RESET Output Current Low (push-pull
active low,
and open-drain active-low, G698L and
G699L)
RESET Output Current High
(push-pull active low, G698L)
RESET Output Current Low (push-pull
active high, G698H)
RESET Output Current High
(push-pull active high, G698H)
RESET Open-Drain Output Leakage
Current (G699L)
CONDITION
TA = 0°C +70°C
TA = -40°C +105°C
VCC<5.5V, G69_ _463/438/400/330_
VCC<3.6V, G69_ _308/293/263_
G69_ _463_
G69_ _438_
G69_ _400_
G69_ _330_
G69_ _308_
G69_ _293_
G69_ _263_
5.5
5.5
25
22
4.69
4.40
4.04
3.37
3.16
2.96
2.69
7
--1.29
--1.2
%
ppm/°C
V
mA
µA
8
---
---
mA
4.5
---
---
3
---
---
2
---
---
16
---
---
12
---
---
10
---
---
VCC = 2.5V, VRESET = 2V
2
---
---
mA
VCC > VTH, RESET deasserted
---
---
1
µA
VCC = 1.5V, VCD = 0.5V
VCC > VTH- + VHYS
IOL
VCC = 2.5V, V RESET = 0.5V
IOH
UNIT
----16.5
13.9
4.60
4.32
3.96
3.30
3.10
2.91
2.64
5.3
70
1.25
5
0.88
ICD
IOL
TYP MAX
0.8
1
----4.50
4.23
3.88
3.25
3.04
2.86
2.59
3.6
--0.87
3
0.5
VTDC
IOH
MIN
VCC = 5V, V RESET = 4.5V,
G698L463/438/400/330
VCC = 3.3V, V RESET = 2.8V,
G698L308/293
VCC = 3V, V RESET = 2.5V,
G698L263
VCC = 5V, VRESET = 0.5V,
G698H463/438/400/330
VCC = 3.3V, VRESET = 0.5V,
G698H308/293
VCC = 3V, VRESET = 0.5V,
G698H263
V
µA
V
mA
mA
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
TEL: 886-3-5788833
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Ver: 1.3
Jun 03, 2004
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Global Mixed-mode Technology Inc.
G698/G699
Selector Guide
PART/SUFFIX
RESET THRESHOLD (V)
OUTPUT TYPE
TOP MARK
G699L463T1U
4.60
Open-Drain RESET
699Gx
G699L438T1U
4.32
Open-Drain RESET
699Fx
G699L400T1U
3.96
Open-Drain RESET
699Ex
G699L330T1U
3.30
Open-Drain RESET
699Dx
G699L308T1U
3.10
Open-Drain RESET
699Cx
G699L293T1U
2.91
Open-Drain RESET
699Bx
G699L263T1U
G698H463T1U
G698H438T1U
G698H400T1U
G698H330T1U
G698H308T1U
G698H293T1U
G698H263T1U
G698L463T1U
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
Open-Drain RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
699Ax
698Lx
698Kx
698Jx
698Nx
698Ix
698Hx
698Gx
698Fx
G698L438T1U
4.32
Push-Pull RESET
698Ex
G698L400T1U
3.96
Push-Pull RESET
698Dx
G698L330T1U
3.30
Push-Pull RESET
698Mx
G698L308T1U
3.10
Push-Pull RESET
698Cx
G698L293T1U
2.91
Push-Pull RESET
698Bx
G698L263T1U
2.64
Push-Pull RESET
698Ax
Push-Pull RESET
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Ver: 1.3
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G698/G699
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.)
Supply Curremt vs. Temperature (No Load)
Supply Current vs. VCC
8
7
7
6
VCC=5V
5
4
3
VCC=3.3V
5
Supply Current (µA)
Supply Current (µA)
6
4
VCC=2.5V
3
2
2
1
1
0
0
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
-40
5.5 6
-20
0
20
VCC (V)
60
80
Output Time Delay vs. Capacitance
Normalized Reset Threshold vs. Temperature
1.06
10000
1.05
1.04
1000
VT
Delay between VCC>VTH to output change
1.03
Output Time Delay
Normalized Ormalized V TH+ , VTH- (V)
40
Temperature (°C)
1.02
1.01
VTH
1
0.99
0.98
100
10
1
Delay between VCC<VTH to output change
0.97
0.96
-40 -30 -20 -10
0
0.1
10 20 27 30 40 50 60 70 80 90
0.0001
0.001
0.1
1
Reset Output Time Delay vs. Temperature
CD Delay Pin Sink Current vs. Voltage
40
300
VCC=3V
35
250
30
Output Time Delay (ms)
ICD, CD DELAY PIN SINK CURRENT (mA)
0.01
CD, Delay Pin Capacitance (µF)
TA, Ambient Temperature (°C)
VCC=2.5V
25
20
15
10
VCC=1.5V
200
CD=0.1µF
150
100
50
5
0
0
0.05
0.2
0.4
0.6
1.2
1.8
2.4
3
-40
VCD, Delay Pin Voltage (V)
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
TA, Ambient Temperature (°C)
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Ver: 1.3
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G698/G699
Global Mixed-mode Technology Inc.
Timing Diagram
VCC
V TH+
VTH-
VCC, Pin 5
VCC
CD, Pin 1
0.675 V IN
VCC
Reset Output
(Active Low), Pin 4
V TH0V
V CC
Reset Output
(Active High), Pin 4
V TH0V
tD2
Figure 1
Functional Diagram
2
VCC
2
ICD
+
*
RESET
ICD
1
VTH
3 GND 5
() is for G698H
1
VCC
RESET
(RESET)
+
VTH
3
CD
GND 5
CD
Figure 2
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Ver: 1.3
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G698/G699
Pin Description
PIN
NAME
1
2.3
CD
GND
4
RESET (G698L/G699L)
RESET (G698H)
5
VCC
FUNCTION
External Programmable time delay is set by the capacitor connect to CD pin.
Ground
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 Output remains high while VCC is below the reset threshold, and for delay time set by
CD after VCC rises above the reset threshold.
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
must be valid down to 0V, adding a pull-down resistor
to RESET causes any stray leakage currents to flow
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The G699L/G698L/G698H 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 G699L uses an open-drain output,
and the G698L/G698H have a push-pull output stage.
Connect a pull-up resistor on the G699L’s RESET output to any supply between 0 and 5.5V.
to ground, holding RESET low (Figure 3). 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 G699L if RESET is required to remain valid
for VCC < 0.8V.
VCC
The time delay is set by external capacitor CD, and
internal pull up current ICD. When the voltage at CD
pin exceeds the buffer threshold, typically 1.25V, 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.
G698
RESET
GND
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 0.8V, the G698 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs connected 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
R1
100k
Figure3. RESET Valid to VCC = Ground Circuit
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G698/G699
Global Mixed-mode Technology Inc.
Interfacing to µPs with Bidirectional Reset Pins
Since the RESET output on the G699L is open drain,
this device interfaces easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output di-
+5.0
+5.0V
+3.3V
VCC
VCC
rectly to the microcontroller’s (µC’s) RESET pin with
a single pull-up resistor allows either device to assert
reset (Figure 4).
RPULL-UP
G699
RESET
5V SYSTEM
RESET
INPUT
VCC
GND
GND
VCC
VCC
RPULL-UP
G699
RESET
GND
µP
RESET MOTOROLA
INPUT
68HCXX
Figure 5. G699L Open-Drain RESET Output Allows
Use with Multiple Supplies
GND
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.
Figure 4. Interfacing to µPs with Bidirectional Reset
I/O
G699L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the G699L 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 5). Note that as the G699L’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.
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.
TEL: 886-3-5788833
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Ver: 1.3
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G698/G699
Package Information
C
D
L
E
H
θ1
e1
e
A
A2
A1
b
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
SYMBOL
A
A1
A2
b
C
D
E
e
e1
H
L
θ1
MIN
DIMENSIONS IN MILLIMETER
NOM
1.00
0.00
0.70
0.35
0.10
2.70
1.40
--------2.60
0.37
1º
1.10
----0.80
0.40
0.15
2.90
1.60
1.90(TYP)
0.95
2.80
-----5º
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
--------3.00
----9º
Taping Specification
Feed Direction
SOT23-5 Package Orientation
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.
TEL: 886-3-5788833
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Ver: 1.3
Jun 03, 2004
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