®
TL7700A Series
SUPPLY VOLTAGE SUPERVISORS
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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 voltage and keeps the RESET and RESET out-
puts active (high and low, respectively) as long as
the supply voltage has not reached its nominal volt-
age value. Taking 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
several machine cycles, the device internal time de-
lay is determined by an external capacitor con-
nected to the C
T
input (pin 3).
t
po = 1.3 x 104
x C
T
Where : C
T
is in farads (F) and t
po
in seconds (s). In
addition, when the supply voltage drops below the
nominal value, the outputs will be active until the
supply voltage returns to the nominal value. An ex-
ternal capacitor (typically 0.1
µF)
must be connected
to the REF output (pin 1) to reduce the influence of
fast transients in the supply voltage.
The TL7700AI series is characterized for operation
from – 25
o
C to 85
o
C ; the TL7700AC series is char-
acterized from 0
o
C to 70
o
C.
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SO8
ORDERING NUMBERS
Temperature Range
0 to 70 C
-25 to 85 C
o
o
Minidip
TL77XXACP
TL77XXAIP
S08
TL77XXACD
TL77XXAID
PIN CONNECTION
(top view)
July 2000
1/7
TL7700A Series
BLOCK DIAGRAM
* TL7702A R1 = 0Ω, R2 = open ; TL7705A R1 = 7.8 KΩ, R2 = 10kΩ ; TL7709A R1 = 19.7 KΩ, R2 = 10kΩ ;
TL7712A R1 = 32.7kΩ, R2 = 10kΩ ; TL7715A R1 = 43.4 KΩ, R2 = 10kΩ.
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
V
i
V
i
I
OH
I
OL
T
amb
Parameter
Supply Voltage, V
CC
- (see note 1)
Input Voltage Range at RESIN
Input Voltage at SENSE :
High-level Output Current at RESET
Low-level Output Current at RESET
Operating Free-air Temperature Range :
TL77XXAI
TL77XXAC
Storage Temperature Range
TL7702A (see note 2)
TL7705A
Value
20
-0.3 to 20
T
stg
Notes :
1. All voltage values are with respect to the network ground terminal
2. For the TL7700A, the voltage applied to the SENSE terminal must never exceed V
s
.
THERMAL DATA
Symbol
R
th j-amb
Thermal Resistance Junction-ambient
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min.
3.6
2
0.6
TL7702A
TL7705A
0
0
See note 3
10
-16
16
-25
0
85
70
Max.
18
Unit
V
V
V
V
mA
mA
o
bs
O
V
S
V
IH
V
IL
V
i
I
OH
I
OL
T
amb
Note :
et
l
o
P
e
ro
uc
d
s)
t(
so
b
-O
te
le
r
P
-0.3 to 6
-0.3 to 10
-30
30
od
s)
t(
uc
V
V
V
o
o
Unit
mA
mA
C
-25 to 85
0 to 70
-65 to 150
C
Parameter
Max.
Value
120
Unit
o
C/W
Supply Voltage
High-level Input Voltage at RESIN
Low-level Input Voltage at RESIN
Voltage at Sense Input
High-level Output Current at RESET
Low-level Output Current at RESET
Operating Free-air Temperature Range TL77-AI
TL77-AC
C
3. For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed V
s
- 1V or 6V, which ever is less.
2/7
TL7700A Series
ELECTRICAL CHARACTERISTICS these
specifications unless otherwise specified, apply for :
T
amb
= –25 to 85
o
C (TLXXAI), T
amb
= 0 to 70
o
C (TL77XXAC)
Symbol
V
OH
V
OL
V
ref
V
T
V
T
V
T+
, V
T–
I
I
I
I
I
OH
I
OL
I
S
Parameter
High-level Output Voltage at RESET
Low-Level Output Voltage at RESET
Reference Voltage
Threshold Voltage at SENSE Input
Threshold Voltage at SENSE Inpu
Hysteresis (2) at SENSE Input
Input Current at RESIN Input
Input Current at SENSE Input
High-level Output Current at RESET
Low-level Output Current at RESET
Supply Current
TL7702A
TL7702A
TL7705A
TL7702A
TL7705A
TL7702A
TL7705A
Test Conditions (1)
I
OH
= –16mA
I
OL
= 16mA
T
amb
= 25 C
V
s
= 3.6V to 18V
T
amb
= 25
o
C
V
s
= 3.6V to 18V
V
s
= 3.6V to 18V
T
amb
= 25
o
C
V
i
= 2.4V to V
S
V
i
= 0.4V
V
ref
< V
i
< V
s
- 1.5V
V
O
= 18V
V
O
= 0V
All Inputs and out.
open
o
Min.
V
s
-
1.5
Typ.
Max.
Unit
V
0.4
2.48
2.48
4.5
2.45
4.45
2.53
2.53
4.55
2.53
4.55
10
15
20
-100
0.5
50
-50
1.8
2
2.58
2.58
4.6
2.58
4.6
V
V
V
V
mV
µA
µA
µA
µA
Notes :
1. All characteristics are measured with C = 0.1µF from Pin 1 to GND, and with C = 0.1µF from Pin 3 to GND.
2. Hysteresis is the difference between the positive going input threshold voltage. V
T+
, and the negative going input threshold
voltage, V
T-
.
SWITCHING CHARACTERISTICS
Symbol
t
pi
t
pi
t
po
t
pdHL
t
r/f
Parameter
Pulse Width at SENSE Input
Pulse Width at RESIN Input
Pulse Width at Output
Propagation Delay Time from RESIN
to RESET
Rise/Falltime at RESET and RESET
bs
O
et
l
o
P
e
ro
uc
d
s)
t(
V
ih
= V
ityp
+0.04 x V
i
V
iL
= V
ityp
–0.04 x V
i
C
T
= 0.1µF
C
L
= 100pF, V
s
= 5V, R
L
= 4.7kΩ
C
L
= 10pF, V
s
= 5V, R
L
= 4.7kΩ
so
b
-O
P
te
le
od
r
Min.
0.9
0.4
0.65
ct
u
3.3
s)
(
mA
Test Conditions
Typ.
Max.
Unit
µs
µs
1.3
2.6
1
1
ms
µs
µs
3/7
TL7700A Series
Figure 1 :
Reset Controller for
µP
TL7705
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4/7
TL7700A Series
DIM.
MIN.
A
a1
a2
a3
b
b1
C
c1
D (1)
E
e
e3
F (1)
L
M
S
3.8
0.4
4.8
5.8
1.27
3.81
4.0
1.27
0.6
8
°
(max.)
0.15
0.016
0.65
0.35
0.19
0.25
0.1
mm
TYP.
MAX.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
0.026
0.014
0.007
0.010
0.004
MIN.
inch
TYP.
MAX.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
OUTLINE AND
MECHANICAL DATA
45° (typ.)
5.0
6.2
0.189
0.228
0.050
0.150
0.157
0.050
0.024
0.197
0.244
SO8
(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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