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GS809C and GS810C
New Product
Vishay
formerly General Semiconductor
Microprocessor Reset Monitors
Pin Configuration SOT-23 (Top View)
GND 1 3 Reset Output 2 Vcc
Description
* 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 40s (TD1). Reset is maintained active for a time period (TD2), after the Vcc rises above the threshold voltage. * To prevent jitter, the reset threshold voltage has a built-in hysteresis of 0.4% of VTH. * 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.
Fig. 1 - Typical Application Diagram
VCC VCC GS809C Reset VCC Processor Reset Input GND
* Low supply current of 3A 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.
GND
Applications
* Computers * Battery Powered Equipment * Critical uProcessor and uController power supply monitoring
Features
* Tight reset voltage tolerances 1.5% * 4 reset active timeout period options * Low quiescent current: < 3A * 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 -40C to +85C
Document Number 74808 01-Nov-02
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GS809C and GS810C
Vishay
formerly General Semiconductor
Ordering Information
Reset Active Low GS809CxxEUx GS810CxxEUx Reset Active High
Reset Timeout Period Default: 210mS E: 150mS D: 30mS A : 1.5mS 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
L: Q: R: S:
GS810C, 1.5mS GS810C, 30.0mS GS810C, 150.0mS GS810C, 210.0mS
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Document Number 74808 01-Nov-02
GS809C and GS810C
Vishay
formerly General Semiconductor
Absolute Maximum Ratings (1)
Parameter Supply Voltage Reset/Reset Input Current, Vcc Output Current, Reset/Reset dV/dT (Vcc) Operating Temperature Range Storage Temperature Range Power Dissipation (TA 70C) SOT-23 (Derate 4mW/C above 70C) TA Tstg PD Symbol Vcc Value 6.0 -0.3 to (Vcc + 0.3) 20 20 100 -40 to +85 -65 to +150 260 Unit V V mA mA V/S C C mW
Note: (1) Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
Electrical Characteristics
Parameter Vcc Range
TA = 25C unless otherwise noted.
Symbol VRANGE
Test Conditions
Min 1
Typ - - - - VTHNOM VTHNOM 0.4
Max 5.5 5.5 3.0 5.0 VTHNOM+1.5% VTHNOM+2.0%
Unit V A
TA = -40 to +85C Supply Current ICC Vcc = 3.0V Vcc=3.0V, TA= -40 to +85C Reset Threshold Threshold Hysteresis Reset Threshold Temperature Coefficient Reset Output Voltage Low 809C/810C 809C Vcc < VTH min 810C Vcc > VTH max TA = -40 to +85C ISINK = 1.2mA 809C Vcc > VTH max 810C Vcc < VTH min TA = -40 to +85C ISOURCE = 0.5mA VCC = VTH - 100mV TA = -40 to +85C TA = -40 to +85C VTH TA = -40 to +85C VTH HIST
1 - - VTHNOM-1.5% VTHNOM-2.0%
V %VTH
-
30
-
ppm/C
VOL
-
-
0.5
V
Reset Output Voltage High 809C/810C
VOH
0.8VCC
-
-
V
VCC to Reset Delay Reset Timeout Period
TD1 TD2
- TD2NOM-35%
40 TD2NOM
- TD2NOM+35%
S mS
Document Number 74808 01-Nov-02
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GS809C and GS810C
Vishay
formerly General Semiconductor
Ratings and Characteristic Curves (TA = 25C unless otherwise noted)
Fig. 2 - Timing Diagram
VTH
VTH
VCC
TD2 Reset
50%
TD1
50%
TD2 Reset
50%
TD1
50%
Fig. 3 - Transient Rejection Supply (VCC) Transients
Transient Duration (S)
140 120 100 80 60 40 20 0 0.01
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.
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 (TA = 25C unless otherwise noted)
Fig. 4 - Reset Time vs. Temperature
220 2.35
Fig. 5 - ICC vs. Temperature
215
210 205
GS809CREU
Supply Current @5V (A)
2.30
Reset Time (mS)
2.25
GS809CREU
2.20
200 195
2.15
190 --50 --20 10 40 70 100 130
2.10 --50
--20
10
40
70
100
130
Temperature (C)
Temperature (C)
Fig. 6 - Reset Vth vs. Temperature
2.650 2.648 2.646 2.644 1.6 85C 2
Fig. 7 - ICC vs. VCC
Reset Vth (V)
40C
2.640 2.638 2.636 2.634 2.632 2.630 --50 --20
GS809CREU
I CC (A)
2.642
1.2 0C 0.8
0.4
0 10 40 70 100 130
0
1
2
3
4
5
Temperature (C)
VCC (V)
Fig. 8 - TD1 Delay vs. Temperature
43
42
TD1 Delay (S)
41 40 39 38 37 --40
--20
0
20
40
60
80
100
Temperature (C)
Document Number 74808 01-Nov-02
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GS809C and GS810C
Vishay
formerly General Semiconductor
Ratings and Characteristic Curves (TA = 25C unless otherwise noted)
Fig. 9 - Threshold Hysteresis vs. Temperature
0.5 0.265 0.260
Fig. 10 - Reset VOL vs. Temperature
Reset VOL @0.8mA (V)
0.4
0.255 0.250 0.245 0.240
Hysteresis (% of VTH)
0.3
0.2
GS809CREU
0.235 0.230 0.225
0.1
0 --40
0.220 --20 0 20 40 60 80 100 --50 --20 10 40 70 100 130
Temperature (C)
Temperature (C)
SOT-23 Case Outline
3.10 2.70
Top View
Mounting Pad Layout
0.031 (0.8)
3
1.80 1.40 3.00 2.60
0.035 (0.9)
1
1.90 (TYP.)
2
Dimensions in millimeters 0.079 (2.0)
1.40 1.00 1.25 0.70 0.50 0.35 0.25 0.10 1 9 1
0.037 (0.95)
0.037 (0.95)
0.15
0.55 0.35
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Document Number 74808 01-Nov-02

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