ST TL7700A User Manual
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SUPPLY VOLTAGE SUPERVISORS
.POWER-ONRESETGENERATOR
.AUTOMATIC RESET GENERATION AFTER
VOLTAGEDROP
.
WIDE SUPPLY VOLTAGE RANGE ... 3V TO
18V
.
PRECISIONVOLTAGESENSOR
.TEMPERATURE-COMPENSATED VOLTAGE
REFERENCE
.
TRUEANDCOMPLEMENTRESETOUTPUTS
.EXTERNALLYADJUSTABLEPULSE WIDTH
DESCRIPTION
TheTL7700Aseriesaremonolithicintegratedcircuit
supplyvoltagesupervisorsspecificallydesi-gnedfor
use as reset controllers in microcomputerand microprocessorsystems.During power-upthedevice
teststhesupplyvoltageandkeepsthe RESET and
RESEToutputsactive(high and low, respectively)
as long as the supply voltage has not reached its
nominalvoltage value.Taking RESIN low has the
sameeffect.Toensurethatthe microcomputersystemhasreset,theTL7700Atheninitiatesaninternal
timedelaythatdelaysthereturnofthe resetoutputs
totheirinactivestates.Sincethetimedelayformost
microcomputersandmicroprocessorsisintheorder
of several machinecycles, the device internaltime
delayis determinedby an externaltimedelayisdeterminedbyan externalcapacitorconnectedtothe
input(pin3).
C
T
t
=1.3x 104xC
d
Where: CTisin farads(F) and tdinseconds (s).In
addition,when the supplyvoltagedrops below the
nominal value, the outputs will be active until the
supplyvoltagereturnstothe nominalvalue.An externalcapacitor(typically0.1µF)mustbeconnected
to the REF output(pin 1) to reducetheinfluenceof
fasttransientsin the supply voltage.
TheTL7700AIseries is characterizedforoperation
from– 25
acterizedfrom 0
o
T
Cto85oC ; theTL7700ACseriesischar-
o
Cto70oC.
TL7700A Series
N
Minidip
D
SO8
ORDERINGNUMBERS
Temperature Range Minidip S08
-25to 85
PIN CONNECTION (top view)
0to70
o
C TL77XXACP TL77XXACD
o
C TL77XXAIP TL77XXAID
April 2000
1/7
TL7700A Series
BLOCK DIAGRAM
*
TL7702A R1 =0Ω, R2 = open; TL7705A R1= 7.8KΩ, R2 = 10kΩ;TL7709A R1 = 19.7KΩ,R2 = 10kΩ;
TL7712A R1 = 32.7kΩ, R2 = 10kΩ; TL7715AR1 = 43.4 KΩ, R2 = 10kΩ.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
OH
I
T
amb
T
Notes: 1. All voltagevaluesare withrespect to the networkground terminal
Supply Voltage, VCC- (see note 1) 20 V
S
Input Voltage Range at RESIN -0.3 to 20 V
i
Input Voltage at SENSE : TL7702A (see note 2)
i
TL7705A
-0.3 to 6
-0.3 to 10
High-level Output Current at RESET -30 mA
Low-level Output Current at RESET 30 mA
OL
Operating Free-air Temperature Range :
TL77XXAI
TL77XXAC
Storage Temperature Range -65 to 150
stg
2. For the TL7700A, thevoltage appliedto the SENSEterminal must neverexceed V
.
s
-25 to 85
0to70
V
o
C
o
C
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal Resistance Junction-ambient Max. 120
o
C/W
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min. Max. Unit
V
V
V
V
I
OH
I
T
amb
Note : 3. Forproper operation of theTL7702A,thevoltage applied totheSENSEterminalshould not exceed Vs-1V or6V,whicheverisless.
2/7
Supply Voltage 3.6 18 V
S
High-level Input Voltage at RESIN 2 V
IH
Low-level Input Voltage at RESIN 0.6 V
IL
Voltage at Sense Input TL7702A
i
TL7705A
0
See note 310V
0
High-level Output Current at RESET -16 mA
Low-level Output Current at RESET 16 mA
OL
Operating Free-air Temperature Range TL77-AI
TL77-AC
-25
0
85
70
o
C
TL7700A Series
ELECTRICAL CHARACTERISTICS these specificationsunless otherwisespecified, apply for :
= –25 to 85oC (TLXXAI),T
T
amb
Symbol Parameter Test Conditions (1) Min. Typ. Max. Unit
V
V
V
V
V
V
T+,VT–
I
OH
I
I
Notes:
High-level Output Voltage at RESET IOH= –16mA Vs-
OH
Low-Level Output Voltage at RESET IOL= 16mA 0.4 V
OL
Reference Voltage T
ref
Threshold Voltage at SENSE Input TL7702A
T
Threshold Voltage at SENSE Inpu TL7702A
T
Hysteresis (2) at SENSE Input TL7702A
I
Input Current at RESIN Input Vi= 2.4V to V
I
I
Input Current at SENSE Input TL7702A V
I
High-level Output Current at RESET VO= 18V 50
Low-level Output Current at RESET VO=0V -50 µA
OL
Supply Current All Inputs and out.
S
1. All characteristicsare measured withC = 0.1µF from Pin1 toGND, and withC = 0.1µF fromPin 3 to GND.
2. Hysteresis is thedifferencebetween thepositive going inputthreshold voltage. V
voltage, V
.
T-
= 0 to 70oC (TL77XXAC)
amb
TL7705A
TL7705A
TL7705A
1.5
=25oC 2.48 2.53 2.58 V
amb
Vs= 3.6V to 18V
=25oC
T
amb
2.48
Vs= 3.6V to 18V 2.45
4.45
Vs= 3.6V to 18V
=25oC
T
amb
Vi= 0.4V
ref<Vi<Vs
S
- 1.5V 0.5 2
4.5
2.53
4.55
2.53
4.55
10
15
20
-100
1.8 3.3 mA
open
,and thenegativegoing inputthreshold
T+
2.58
4.6
2.58
4.6
V
V
V
mV
µ
µ
µ
A
A
A
SWITCHING CHARACTERISTICS
Symbol Parameter Test Conditions Min. Typ. Max. Unit
t
t
t
pdHL
t
Pulse Width at SENSE Input Vih=V
pi
t
Pulse Width at RESIN Input 0.4
pi
Pulse Width at Output CT= 0.1µF 0.65 1.3 2.6 ms
po
Propagation Delay Time from RESIN
ViL=V
CL= 100pF, Vs= 5V, RL= 4.7k
to RESET
Rise/Falltime at RESET and RESET CL= 10pF, Vs= 5V, RL= 4.7k
r/f
+0.04 x V
ityp
–0.04 x V
ityp
i
i
0.9
Ω
Ω
1
1
s
µ
s
µ
s
µ
s
µ
3/7
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