TL7700 SERIA.PDF

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SUPPLY VOLTAGE SUPERVISORS
TL7700 A Series
SUPPLY VOLTAGE SUPERVISORS
. POWER-ON RESET GENERATOR
. AUTOMATIC RESET GENERATION AFTER
VOLTAGE DROP
. PRECISION VOLTAGE SENSOR
. TEMPERATURE-COMPENSATED VOLTAGE
REFERENCE
. TRUE AND COMPLEMENT RESET OUTPUTS
. EXTERNALLY ADJUSTABLE PULSE WIDTH
N
Minidip
DESCRIPTION
The TL7700Aseries are monolithic integratedcircuit
supply voltage supervisors specifically desi-gned for
use as reset controllers in microcomputer and mi-
croprocessor systems. During power-up the device
tests the supply voltage and keeps the RESET and
RESET outputs active (high and low, respectively)
as long as the supply voltage has not reached its
nominal voltage value. Taking RESIN low has the
same effect. To ensure that the microcomputer sys-
tem has reset, the TL7700A then initiates an internal
time delay that delays the return of the reset outputs
to their inactive states. Since the time delay for most
microcomputers and microprocessors is in the order
of several machine cycles, the device internal time
delay is determined by an external time delay is de-
termined by an external capacitor connected to the
C T input (pin 3).
t d = 1.3 x 10 4 xC T
Where : C T is in farads (F) and t d 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-
ternalcapacitor (typically 0.1 m F) 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 Cto85 o C ; the TL7700AC series is char-
acterized from 0 o Cto70 o C.
D
SO8
ORDERING NUMBERS
Temperature Range
Minidip
S08
0to70 o C
TL77XXACP
TL77XXACD
-25 to 85 o C
TL77XXAIP
TL77XXAID
PIN CONNECTION (top view)
April 1993
1/7
. WIDE SUPPLY VOLTAGE RANGE ... 3V TO
18V
311066058.002.png
TL7700A Series
BLOCK DIAGRAM
* TL7702A R1 = 0
, R2 = open ; TL7705A R1 = 7.8 K
W
, R2 = 10k
W
; TL7709A R1 = 19.7 K
W
, R2 = 10k
W
;
TL7712A R1 = 32.7k
W
, R2 = 10k
W
; TL7715A R1 = 43.4 K
W
, R2 = 10k
W
.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
Supply Voltage, V CC - (see note 1)
20
V
V i
Input Voltage Range at RESIN
-0.3 to 20
V
V i
Input Voltage at SENSE :
TL7702A (see note 2)
TL7705A
TL7709A
TL7712A
TL7715A
-0.3 to 6
-0.3 to 10
-0.3 to 15
-0.3 to 20
-0.3 to 20
V
I OH
High-level Output Current at RESET
-30
mA
I OL
Low-level Output Current at RESET
30
mA
T amb
Operating Free-air Temperature Range :
TL77XXAI
TL77XXAC
-25 to 85
0to70
o C
T stg
Storage Temperature Range
-65 to 150
o C
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
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 S
Supply Voltage
3.6
18
V
V IH
High-level Input Voltage at RESIN
2
V
V IL
Low-level Input Voltage at RESIN
0.6
V
V i
Voltage at Sense Input
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
0
0
0
0
0
See note 3
10
15
20
20
V
I OH
High-level Output Current at RESET
-16
mA
I OL
Low-level Output Current at RESET
16
mA
T amb
Operating Free-air Temperature Range TL77-AI
TL77-AC
-25
0
85
70
o C
Note : 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
W
311066058.003.png
TL7700A Series
ELECTRICAL CHARACTERISTICS t hese specifications unless otherwise specified, apply for :
T amb = –25 to 85 o C (TLXXAI), T amb = 0 to 70 o C (TL77XXAC)
Symbol
Parameter
Test Conditions (1) Min.
Typ. Max. Unit
V OH
High-level Output Voltage at RESET
I OH = –16mA
V s -
1.5
V
V OL
Low-Level Output Voltage at RESET
I OL = 16mA
0.4
V
V ref
Reference Voltage
T amb =25 o C
2.48
2.53 2.58
V
V T
Threshold Voltage at SENSE Input
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
V s = 3.6V to 18V
T amb =25 o C
2.48
4.5
7.5
10.6
13.2
2.53
4.55
7.6
10.8
13.5
2.58
4.6
7.7
11
13.8
V
V T
Threshold Voltage at SENSE Inpu
TL7702A
TL7705A
TL7709A
TL7712A
TL7715At
V s = 3.6V to 18V
2.45
4.45
7.4
10.4
13
2.53
4.55
7.6
10.8
13.5
2.58
4.6
7.7
11
13.8
V
V T+ ,V T– Hysteresis (2) at SENSE Input
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
V s = 3.6V to 18V
T amb =25 o C
10
15
20
35
45
mV
I I
Input Current at RESIN Input
V i = 2.4V to V S
V i = 0.4V
20
-100
m
A
I I
Input Current at SENSE Input
TL7702A
V ref <V i <V s - 1.5V
0.5
2
m
A
I OH
High-level Output Current at RESET
V O = 18V
50
m
A
I OL
Low-level Output Current at RESET
V O = 0V
-50
m
A
I S
Supply Current
All Inputs and out.
open
1.8
3.3
mA
Notes : 1. All characteristics are measured with C = 0.1
F 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- .
m
F from Pin 1 to GND, and with C = 0.1
m
SWITCHING CHARACTERISTICS
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
t pi
Pulse Width at SENSE Input
V ih =V ityp +0.04 x V i
V iL =V ityp –0.04 x V i
0.9
m
s
t pi
Pulse Width at RESIN Input
0.4
m
s
t po
Pulse Width at Output
C f = 0.1
m
F
0.65 1.3
2.6
ms
t pdHL
Propagation Delay Time from RESIN
to RESET
C L = 100pF, V s = 5V, R L = 4.7k
W
1
m
s
t r/f
Rise/Falltime at RESET and RESET
C L = 10pF, V s = 5V, R L = 4.7k
W
1
m
s
3/7
311066058.004.png
TL7700A Series
Figure 1 : Multiple Power Supply System Reset Generation
Figure 2 : Reset Controller for m P
4/7
311066058.005.png
TL7700A Series
SO8 PACKAGE MECHANICAL DATA
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
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
3.8
4.0
0.15
0.157
L
0.4
1.27
0.016
0.050
M
0.6
0.024
S
8
°
(max.)
5/7
311066058.001.png

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