TL7700A Series
July 2000
SUPPLY VOLTAGE SUPERVISORS
®
.POWER-ON RESET GENERATOR
.AUTOMATIC RESET GENERATION AFTER
VOLTAGE DROP
.WIDE SUPPLY VOLTAGE RANGE ... 3V TO
18V
.PRECISION VOLTAGE SENSOR
.TEMPERATURE-COMPENSATED VOLTAGE
REFERENCE
.TRUE AND COMPLEMENT RESET OUTPUTS
.EXTERNALLY ADJUSTABLE PULSE WIDTH N
Minidip
DESCRIPTION
The TL7700A series are monolithic supply voltage
supervisor IC’s specifically designed for use as reset
controllers in microcomputer and microprocessor
systems. During power-up the device tests the sup-
ply v olt ag e and k eeps the RESET and RESET ou t-
puts active (high and low, respectively) as long as
th e supp ly volt age h as no t reac hed it s n omina l vol t-
age va lue. Tak ing RESIN low has the same effect.
To ensure that the microcomputer system has reset,
the TL7700A then initiates an internal time count
that delays the return of the reset outputs to their in-
active states. Since the time delay for most micro-
computers and microprocessors is in the order of
se ve ral machine cycles, the de vi ce internal time de-
lay is determined by an external capacitor con-
nec t ed to t he CT inp ut (pi n 3) .
tpo = 1. 3 x 104 x CT
Where : CT is in fara ds (F) and tpo in seconds (s). In
addition, when the supply voltage drops below the
nominal value, the outputs will be active until the
su pply v olt ag e re t ur ns to the nom ina l v alue. A n ex-
ternal capacitor (typically 0.1 µF) must be connected
to the RE F output (pi n 1) to re duc e the infl uenc e of
fa st tra ns ients in th e su ppl y v ol ta ge.
T he TL7700 A I ser ies is c har ac t eriz ed f o r o per at ion
from – 25 oC to 85oC ; the T L770 0AC seri es is c har-
a c terize d f rom 0oC to 70oC.
D
SO8
ORDERING NUMBERS
Temperature Range Minidip S08
0 to 70 oC TL77XXACP TL77XXACD
-25 to 85oC TL77XXAIP TL77XXAID
PIN CONNECTION (top view)
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*TL7702 A R1 = 0Ω, R2 = open ; TL 7705A R1 = 7 .8 KΩ, R2 = 10kΩ ; TL7709A R1 = 19.7 K Ω, R2 = 10kΩ ;
TL7712A R1 = 32.7kΩ, R2 = 10kΩ ; TL771 5A R1 = 43. 4 KΩ, R2 = 10kΩ.
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VSSupply Voltage, VCC - (see note 1) 20 V
ViInput Voltage Range at RESIN -0.3 to 20 V
ViInput Voltage at SENSE : TL7702A (see note 2)
TL7705A -0.3 to 6
-0.3 to 10 V
IOH High-level Output Current at RESET -30 mA
IOL Low-level Output Current at RESET 30 mA
Tamb Operating Free-air Temperature Range :TL77XXAI
TL77XXAC -25 to 85
0 to 70
oC
Tstg Storage Temperature Range -65 to 150 oC
Notes : 1. All voltage valu es are with respect to the network ground terminal
2. For the TL7700A, the voltage appl ied to the SENSE terminal must never exc eed Vs.
THER MAL DAT A
Symbol Parameter Value Unit
Rth j-amb Thermal Resistance Junction-ambient Max. 120 oC/W
RECOMMENDED OPERATI NG CONDITIONS
Symbol Parameter Min. Max. Unit
VSSupply Voltage 3.6 18 V
VIH High-level Input Voltage at RESIN 2 V
VIL Low-level Input Voltage at RESIN 0.6 V
ViVoltage at Sense Input TL7702A
TL7705A 0
0See note 3
10 V
IOH High-level Output Current at RESET -16 mA
IOL Low-level Output Current at RESET 16 mA
Tamb Operating Free-air Temperature Range TL77-AI
TL77-AC -25
085
70 oC
Note : 3. For proper operation of the TL7702A, the voltage applied to t he SENSE terminal should not exceed Vs - 1V or 6V, which ever is less.
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ELECTRICAL CHARACTERISTICS these s pecifications unless oth erwise specified, apply for :
Tamb = –25 to 85oC (TLXXAI), Tamb = 0 to 70oC (TL77XXAC)
Symbol Parameter Test Conditions (1) Min. Typ. Max. Unit
VOH High-level Output Voltage at RESET IOH = –16mA Vs -
1.5 V
VOL Low-Level Output Voltage at RESET IOL = 16mA 0.4 V
Vref Reference Voltage T amb = 25oC 2.48 2.53 2.58 V
VTThreshold Voltage at SEN SE Input TL7702A
TL7705A Vs = 3.6V to 18V
Tamb = 25oC2.48
4.5 2.53
4.55 2.58
4.6 V
VTThreshold Voltage at SEN SE Inpu TL7702A
TL7705A Vs = 3.6V to 18V 2.45
4.45 2.53
4.55 2.58
4.6 V
VT+, VT– Hysteresis (2) at SENSE Input TL7702A
TL7705A Vs = 3.6V to 18V
Tamb = 25oC10
15 mV
IIInput Current at RESIN Input Vi = 2.4V to VS
Vi = 0.4V 20
-100 µA
IIInput Current at SENSE Input TL7702A Vref < Vi < Vs - 1.5V 0.5 2 µA
IOH High-level Output Current at RESET VO = 18V 50 µA
IOL Low-level Output Current at RESET VO = 0V -50 µA
ISSupply Current All Inputs and out.
open 1.8 3.3 mA
Notes : 1. All characte ristics are m easured wi t h C = 0.1µF from Pin 1 to GND, and with C = 0.1µF from Pin 3 to G ND.
2. Hysteresis is th e difference bet ween th e positi ve goi ng in put thres hol d voltage. VT+, and the negati ve goin g inp ut thres hol d
voltage, VT-.
SWITCHING CHARACTERISTICS
Symbol Parameter Test Conditions Min. Typ. Max. Unit
tpi Pulse Width at SENSE Input Vih = Vityp + 0.04 x Vi
ViL = Vityp –0.04 x V i0.9 µs
tpi Pulse Width at RESIN Input 0.4 µs
tpo Pulse Width at Output CT = 0.1µF 0.65 1.3 2.6 ms
tpdHL Propagation Delay Time from RESIN
to RESET CL = 100pF, Vs = 5V, RL = 4.7kΩ1µs
tr/ f Rise/Falltime at RESET and RESET CL = 10pF, Vs = 5V, RL = 4.7kΩ1µs
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TL7705
F ig ure 1 : Reset Contr oller for µP
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DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033
b 0.35 0.48 0.014 0.019
b1 0.19 0.25 0.007 0.010
C 0.25 0.5 0.010 0.020
c1 45° (typ.)
D (1) 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 3.81 0.150
F (1) 3.8 4.0 0.15 0.157
L 0.4 1.27 0.016 0.050
M 0.6 0.024
S8° (max.)
(1) D and F do not include mold flash or protrusions. Mold flash or
potrusions shall not exceed 0.15mm (.006inch).
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OUTLINE AND
MECHANICAL DATA
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Minidip
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 3.32 0.131
a1 0.51 0.020
B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022
b1 0.204 0.304 0.008 0.012
D 10.92 0.430
E 7.95 9.75 0.313 0.384
e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 6.6 0.260
I 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060
OUTLINE AND
MECHANICAL DATA
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quences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this
publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi-
croelectronics products are not authorized for use as critical components in life support devices or systems without express written
approval of STMicroel ectro nics. The ST logo is a r egistered t rademark of S TMicroelec troni cs
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TL7700A Series
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