VISHAY GS809C

GS809C and GS810C
Vishay
New Product
formerly General Semiconductor
Microprocessor Reset Monitors
Description
Pin Configuration
SOT-23 (Top View)
GND
1
3
Reset
Output
Vcc
• The GS809C and 810C are system supervisor
circuits designed to monitor VCC in digital systems
and provide a reset signal to the host processor
when necessary. No external components are
required.
• When the processor power supply voltage drops
below the reset threshold, the reset output is driven
active, in less than 40µs (TD1). Reset is maintained active for a time period (TD2), after the Vcc
rises above the threshold voltage.
2
• To prevent jitter, the reset threshold voltage has a
built-in hysteresis of 0.4% of VTH.
Fig. 1 – Typical Application Diagram
• The GS809C has an active-low reset output, while
the GS810C has an active-high reset output. Both
devices have push/pull output drives.
• The reset signal is guaranteed valid, down to
Vcc = 1.0V.
VCC
VCC
GS809C
Reset
GND
VCC
Processor
Reset
Input
GND
• Low supply current of 3µA makes these devices
well suited for battery powered applications. They
are designed to reject fast transients from causing
false resets.
• Both devices are available in a space-saving
SOT-23 package.
Applications
Features
• Computers
• Battery Powered Equipment
• Critical uProcessor and uController power supply
monitoring
• Tight reset voltage tolerances ± 1.5%
• 4 reset active timeout period options
• Low quiescent current: < 3µA
• 9 reset threshold options from 2.1V to 4.63V
• Reset output guaranteed down to 1.0V
• No external components
• Vcc Transient immunity
• Wide temperature range –40°C to +85°C
Document Number 74808
01-Nov-02
www.vishay.com
1
GS809C and GS810C
Vishay
formerly General Semiconductor
Ordering Information
Reset Timeout
Period
Reset Active Low
Default: 210mS
E: 150mS
D: 30mS
A : 1.5mS
GS809CxxEUx
GS810CxxEUx
Reset Active High
Reset Voltage
Options
L
M
J
T
S
27
R
24
21
Vth = 4.63V
Vth = 4.38V
Vth = 4.0V
Vth = 3.08V
Vth = 2.93V
Vth = 2.7V
Vth = 2.63V
Vth = 2.4V
Vth = 2.1V
Marking Information
X XX XX
Date Code
Year -- Week
Threshold Voltage
26: 2.63V 38: 3.8V 46: 4.63V Etc.
No letters
A:
D:
E:
G:
GS809C,
1.5mS
GS809C, 30.0mS
GS809C, 150.0mS
GS809C, 210.0mS
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2
L:
Q:
R:
S:
GS810C,
1.5mS
GS810C, 30.0mS
GS810C, 150.0mS
GS810C, 210.0mS
Document Number 74808
01-Nov-02
GS809C and GS810C
Vishay
formerly General Semiconductor
Absolute Maximum Ratings (1)
Parameter
Symbol
Value
Unit
Vcc
6.0
V
–0.3 to (Vcc + 0.3)
V
Input Current, Vcc
20
mA
Output Current, Reset/Reset
20
mA
dV/dT (Vcc)
100
V/µS
Supply Voltage
Reset/Reset
Operating Temperature Range
TA
–40 to +85
°C
Storage Temperature Range
Tstg
–65 to +150
°C
Power Dissipation (TA ≤ 70°C)
SOT-23 (Derate 4mW/°C above 70°C)
PD
260
mW
Note: (1) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
Electrical Characteristics
TA = 25°C unless otherwise noted.
Parameter
Symbol
Vcc Range
VRANGE
Supply Current
Reset Threshold
ICC
Test Conditions
Min
Typ
Max
1
–
5.5
TA = –40 to +85°C
1
–
5.5
Vcc = 3.0V
–
–
3.0
Vcc=3.0V, TA= –40 to +85°C
–
–
5.0
VTHNOM–1.5%
VTHNOM
VTHNOM+1.5%
VTHNOM–2.0%
VTHNOM
VTHNOM+2.0%
VTH
TA = –40 to +85°C
Threshold Hysteresis
VTH HIST
Unit
V
µA
0.4
Reset Threshold
Temperature Coefficient
V
%VTH
–
30
–
ppm/°C
VOL
809C Vcc < VTH min
810C Vcc > VTH max
TA = –40 to +85°C
ISINK = 1.2mA
–
–
0.5
V
VOH
809C Vcc > VTH max
810C Vcc < VTH min
TA = –40 to +85°C
ISOURCE = 0.5mA
0.8VCC
–
–
V
VCC to Reset Delay
TD1
VCC = VTH – 100mV
TA = –40 to +85°C
–
40
–
µS
Reset Timeout Period
TD2
TA = –40 to +85°C
TD2NOM–35%
TD2NOM
TD2NOM+35%
mS
Reset Output Voltage Low
809C/810C
Reset Output Voltage High
809C/810C
Document Number 74808
01-Nov-02
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3
GS809C and GS810C
Vishay
formerly General Semiconductor
Ratings and
Characteristic Curves (T
A
= 25°C unless otherwise noted)
Fig. 2 – Timing Diagram
VTH
VTH
VCC
TD2
50%
TD1
50%
Reset
TD2
50%
TD1
50%
Reset
Fig. 3 – Transient Rejection
140
Supply (VCC) Transients
120
Transient Duration (µS)
These devices have a certain immunity to fast negative
going transients. The graph titled “Transient Rejection”
shows the maximum allowable transient amplitude and
duration to avoid triggering an unintended reset. As
shown in the graph shorter transients can have larger
amplitudes without triggering resets.
100
80
60
40
20
0
0.01
0.1
1
Transient Amplitude (V)
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Document Number 74808
01-Nov-02
GS809C and GS810C
Vishay
formerly General Semiconductor
Ratings and
Characteristic Curves (T
A
= 25°C unless otherwise noted)
Fig. 4 – Reset Time vs. Temperature
Fig. 5 – ICC vs. Temperature
2.35
220
Supply Current @5V (µA)
Reset Time (mS)
215
GS809CREU
210
205
200
195
190
--50
--20
10
40
70
100
2.30
2.25
GS809CREU
2.20
2.15
2.10
--50
130
--20
10
40
70
100
130
Temperature (°C)
Temperature (°C)
Fig. 7 – ICC vs. VCC
Fig. 6 – Reset Vth vs. Temperature
2
2.650
2.648
2.646
1.6
85°C
40°C
2.642
I CC (µA)
Reset Vth (V)
2.644
GS809CREU
2.640
2.638
1.2
0°C
0.8
2.636
0.4
2.634
2.632
2.630
0
--50
--20
10
40
70
100
130
Temperature (°C)
0
1
2
3
4
5
VCC (V)
Fig. 8 – TD1 Delay vs. Temperature
43
TD1 Delay (µS)
42
41
40
39
38
37
--40
--20
0
20
40
60
80
100
Temperature (°C)
Document Number 74808
01-Nov-02
www.vishay.com
5
GS809C and GS810C
Vishay
formerly General Semiconductor
Ratings and
Characteristic Curves (T
A
= 25°C unless otherwise noted)
Fig. 9 – Threshold Hysteresis
vs. Temperature
Fig. 10 – Reset VOL vs. Temperature
0.265
0.5
0.260
Reset VOL @0.8mA (V)
Hysteresis (% of VTH)
0.4
0.3
0.2
0.1
0.255
0.250
0.245
0.240
GS809CREU
0.235
0.230
0.225
0
--40
0.220
--20
0
20
40
60
80
100
--50
Temperature (°C)
--20
10
40
70
100
130
Temperature (°C)
SOT-23 Case Outline
3.10
2.70
Top View
Mounting Pad Layout
3
0.031 (0.8)
3.00
2.60
1.80
1.40
0.035 (0.9)
1
2
1.90
(TYP.)
0.079 (2.0)
Dimensions in millimeters
1.40
1.00
0.037 (0.95)
0.25
0.10
1.25
0.70
0.50
0.35
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0.15
0.55
0.35
0.037 (0.95)
θ1 9°
1°
Document Number 74808
01-Nov-02