STMICROELECTRONICS TL7705A

TL7700A Series
®
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 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 system has reset,
the TL7700A then initiates an internal time count
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 capacitor connected to the CT input (pin 3).
tpo = 1.3 x 104 x CT
Where : CT is in farads (F) and tpo 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 external 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 – 25oC to 85oC ; the TL7700AC series is characterized from 0oC to 70oC.
July 2000
D
SO8
ORDERING NUMBERS
Temperature Range
o
Minidip
S08
0 to 70 C
TL77XXACP
TL77XXACD
-25 to 85oC
TL77XXAIP
TL77XXAID
PIN CONNECTION (top view)
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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
Parameter
Value
Unit
20
V
-0.3 to 20
V
-0.3 to 6
-0.3 to 10
V
VS
Supply Voltage, VCC - (see note 1)
Vi
Input Voltage Range at RESIN
Vi
Input Voltage at SENSE :
IOH
High-level Output Current at RESET
-30
mA
IOL
Low-level Output Current at RESET
30
mA
Tamb
Tstg
TL7702A (see note 2)
TL7705A
Operating Free-air Temperature Range :
TL77XXAI
TL77XXAC
-25 to 85
0 to 70
Storage Temperature Range
-65 to 150
o
C
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
Rth j-amb
Parameter
Value
Thermal Resistance Junction-ambient
Max.
Unit
o
120
C/W
RECOMMENDED OPERATING CONDITIONS
Symbol
Min.
Max.
Unit
3.6
18
V
Supply Voltage
VIH
High-level Input Voltage at RESIN
VIL
Low-level Input Voltage at RESIN
Vi
Voltage at Sense Input
IOH
High-level Output Current at RESET
-16
mA
IOL
Low-level Output Current at RESET
16
mA
85
70
o
Tamb
Note :
2/7
Parameter
VS
2
TL7702A
TL7705A
Operating Free-air Temperature Range TL77-AI
TL77-AC
0
0
-25
0
V
0.6
V
See note 3
10
V
C
3. For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed Vs - 1V or 6V, which ever is less.
TL7700A Series
ELECTRICAL CHARACTERISTICS these specifications unless otherwise specified, apply for :
Tamb = –25 to 85oC (TLXXAI), Tamb = 0 to 70oC (TL77XXAC)
Symbol
Parameter
Test Conditions (1)
Min.
Vs 1.5
VOH
High-level Output Voltage at RESET
IOH = –16mA
VOL
Low-Level Output Voltage at RESET
IOL = 16mA
o
Typ.
Max.
Unit
V
0.4
V
Vref
Reference Voltage
T amb = 25 C
2.48
2.53
2.58
V
VT
Threshold Voltage at SENSE Input
TL7702A
TL7705A
Vs = 3.6V to 18V
Tamb = 25oC
2.48
4.5
2.53
4.55
2.58
4.6
V
VT
Threshold Voltage at SENSE Inpu
TL7702A
TL7705A
Vs = 3.6V to 18V
2.45
4.45
2.53
4.55
2.58
4.6
V
Hysteresis (2) at SENSE Input
TL7702A
TL7705A
Vs = 3.6V to 18V
Tamb = 25oC
VT+, VT–
II
Input Current at RESIN Input
II
Input Current at SENSE Input
Vi = 2.4V to VS
Vi = 0.4V
TL7702A
Vref < Vi < Vs - 1.5V
10
15
mV
20
-100
µA
0.5
IOH
High-level Output Current at RESET
VO = 18V
50
IOL
Low-level Output Current at RESET
VO = 0V
-50
IS
Supply Current
All Inputs and out.
open
1.8
2
µA
µA
µA
3.3
mA
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, VT-.
SWITCHING CHARACTERISTICS
Symbol
Parameter
tpi
Pulse Width at SENSE Input
tpi
Pulse Width at RESIN Input
tpo
Test Conditions
Min.
Vih = Vityp +0.04 x Vi
ViL = Vityp –0.04 x Vi
0.9
Pulse Width at Output
CT = 0.1µF
0.65
tpdHL
Propagation Delay Time from RESIN
to RESET
tr/f
Rise/Falltime at RESET and RESET
Typ.
Max.
Unit
µs
µs
0.4
1.3
2.6
ms
CL = 100pF, Vs = 5V, RL = 4.7kΩ
1
µs
CL = 10pF, Vs = 5V, RL = 4.7kΩ
1
µs
3/7
TL7700A Series
Figure 1 : Reset Controller for µP
TL7705
4/7
TL7700A Series
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.25
a2
MAX.
0.069
0.004
0.010
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
S
OUTLINE AND
MECHANICAL DATA
0.6
0.024
SO8
8 ° (max.)
(1) D and F do not include mold flash or protrusions. Mold flash or
potrusions shall not exceed 0.15mm (.006inch).
5/7
TL7700A Series
mm
DIM.
MIN.
A
TYP.
MAX.
MIN.
3.32
TYP.
MAX.
0.51
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
E
0.020
10.92
7.95
9.75
0.430
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
Z
3.18
OUTLINE AND
MECHANICAL DATA
0.131
a1
D
6/7
inch
3.81
1.52
0.125
0.150
0.060
Minidip
TL7700A Series
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences 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. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written
approval of STMicroelectronics.
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