TL7702A [TI]
SUPPLY-VOLTAGE SUPERVISORS; 电源电压监事
| 型号： | TL7702A |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SUPPLY-VOLTAGE SUPERVISORS |
| 文件： | 总10页 (文件大小：143K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
D OR P PACKAGE
(TOP VIEW)
Power-On Reset Generator
Automatic Reset Generation After Voltage
Drop
REF
RESIN
CT
V
CC
1
2
3
4
8
7
6
5
Wide Supply-Voltage Range
Precision Voltage Sensor
SENSE
RESET
RESET
GND
Temperature-Compensated Voltage
Reference
True and Complement Reset Outputs
Externally Adjustable Pulse Duration
description
The TL77xxA family of integrated-circuit supply-voltage supervisors is specifically designed for use as reset
controllers in microcomputer and microprocessor systems. The supply-voltage supervisor monitors the supply
for undervoltage conditions at the SENSE input. During power up, the RESET output becomes active (low)
when V attains a value approaching 3.6 V. At this point (assuming that SENSE is above V ), the delay timer
CC
IT+
function activates a time delay, after which outputs RESET and RESET go inactive (high and low, respectively).
When an undervoltage condition occurs during normal operation, outputs RESET and RESET go active. To
ensure that a complete reset occurs, the reset outputs remain active for a time delay after the voltage at the
SENSE input exceeds the positive-going threshold value. The time delay is determined by the value of the
4
external capacitor C : t = 1.3 × 10 × C , where C is in farads (F) and t is in seconds (s).
T d
T
T
d
During power down (assuming that SENSE is below V ), the outputs remain active until the V
IT–
a maximum of 2 V. After this, the outputs are undefined.
falls below
CC
An external capacitor (typically 0.1 µF for the TL77xxAC and TL77xxAI) must be connected to REF to reduce
the influence of fast transients in the supply voltage.
The TL77xxAC series is characterized for operation from 0°C to 70°C. The TL77xxAI series is characterized
for operation from –40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
CHIP
SMALL
OUTLINE
(D)
PLASTIC
DIP
FORM
(Y)
T
A
(P)
TL7702ACD
TL7705ACD
TL7709ACD
TL7712ACD
TL7715ACD
TL7702ACP
TL7705ACP
TL7709ACP
TL7712ACP
TL7715ACP
TL7702ACY
TL7705ACY
TL7709ACY
TL7712ACY
TL7715ACY
0°C to 70°C
TL7702AID
TL7705AID
TL7709AID
TL7712AID
TL7715AID
TL7702AIP
TL7705AIP
TL7709AIP
TL7712AIP
TL7715AIP
—
—
—
—
—
–40°C to 85°C
The D package is available taped and reeled. Add the suffix R to the
device type (e.g., TL7702ACDR). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
functional block diagram
The functional block diagram is shown for illustrative purposes only; the actual circuit includes a trimming
network to adjust the reference voltage and sense-comparator trip point.
8
V
CC
Reference
Voltage
≈100 µA
6
5
RESET
RESET
3
7
CT
SENSE
R1
(see Note A)
R2
(see Note A)
2
4
RESIN
GND
1
REF
NOTES: A. TL7702A: R1 = 0 Ω, R2 = open
TL7705A: R1 = 7.8 kΩ, R2 = 10 kΩ
TL7709A: R1 = 19.7 kΩ, R2 = 10 kΩ
TL7712A: R1 = 32.7 kΩ, R2 = 10 kΩ
TL7715A: R1 = 43.4 kΩ, R2 = 10 kΩ
B. Resistor values shown are nominal.
timing diagram
V
CC
and SENSE
Threshold Voltage
≈ 3.6 V
V
CC
V
CC
≈ 2 V
t
RESET
d
t
d
Output
Undefined
Output
Undefined
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
†
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
CC
Input voltage range, V , RESIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V
Input voltage range, V , SENSE:TL7702A (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6 V
I
I
TL7705A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V
TL7709A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V
TL7712A, TL7715A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V
High-level output current, I , RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA
OH
Low-level output current, I , RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
OL
Package thermal impedance, θ (see Notes 3 and 4): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
JA
P package . . . . . . . . . . . . . . . . . . . . . . . . . . . 127°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or P package . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to the network ground terminal.
2. For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed V
is less.
– 1 V or 6 V, whichever
CC
3. Maximum power dissipation is a function of T (max), θ , and T . The maximum allowable power dissipation at any allowable
J
JA
A
ambient temperature is P = (T (max) – T )/θ . Operating at the absolute maximum T of 150°C can impact reliability.
D
J
A
JA
J
4. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
MIN
3.5
2
MAX
UNIT
Supply voltage, V
CC
18
V
V
V
High-level input voltage at RESIN, V
IH
Low-level input voltage at RESIN, V
0.6
IL
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
0
0
0
0
0
See Note 2
10
15
Input voltage, SENSE, V
V
I
20
20
High-level output current, RESET, I
–16
16
mA
mA
µF
OH
Low-level output current, RESET, I
Timing capacitor, C
OL
10
T
TL77xxAC
TL77xxAI
0
70
Operating free-air temperature range, T
°C
A
–40
85
NOTE 2: For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed V
– 1 V or 6 V, whichever is less.
CC
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
electrical characteristics over recommended operating conditions (unless otherwise noted)
TL77xxAC
TL77xxAI
†
PARAMETER
UNIT
TEST CONDITIONS
MIN
TYP
MAX
V
V
High-level output voltage, RESET
Low-level output voltage, RESET
Reference voltage
I
I
= –16 mA
= 16 mA
V –1.5
CC
V
V
V
OH
OH
0.4
2.58
2.58
4.6
OL
OL
V
ref
T
= 25°C
2.48
2.48
4.5
2.53
2.53
4.55
7.6
10.8
13.5
10
A
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
Negative-going input threshold voltage,
SENSE
V
IT–
T
= 25°C
7.5
7.7
V
A
10.6
13.2
11
13.8
15
V
hys
Hysteresis, SENSE (V
Input current
– V
)
T = 25°C
A
20
mV
IT+
IT–
35
45
V = 2.4 V to V
I
20
–100
2
CC
RESIN
I
I
V = 0.4 V
I
µA
SENSE
TL7702A
V
< V < V
I
– 1.5 V
CC
0.5
1.8
ref
I
I
I
High-level output current, RESET
Low-level output current, RESET
Supply current
V
= 18 V
= 0
50
µA
µA
OH
O
O
V
–50
3
OL
CC
All inputs and outputs open
mA
†
All electrical characteristics are measured with 0.1-µF capacitors connected at REF, CT, and V
CC
to GND.
switching characteristics over recommended operating conditions (unless otherwise noted)
TL77xxAC
TL77xxAI
‡
PARAMETER
UNIT
TEST CONDITIONS
MIN
0.65
0.4
TYP
MAX
Output pulse duration
C
= 0.1 µF
1.2
2.6
µs
µs
T
Input pulse duration at RESIN
Pulse duration
at SENSE input to switch outputs
t
t
V
V
= V
+200 mV,
V
= V
–200 mV
2
µs
µs
w(S)
IH
IT–
IL
IT–
Propagation delay time, RESIN to RESET
= 5 V
= 5 V,
1
0.2
3.5
3.5
0.2
pd
CC
RESET
t
Rise time
V
See Note 5
See Note 5
µs
µs
r
f
CC
CC
RESET
RESET
t
Fall time
V
= 5 V,
RESET
‡
All switching characteristics are measured with 0.1-µF capacitors connected at REF and V
to GND.
CC
NOTE 5: The rise and fall times are measured with a 4.7-kΩ load resistor at RESET and RESET.
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
electrical characteristics over recommended operating conditions, T = 25°C (unless otherwise
A
noted)
TL77xxAY
†
PARAMETER
UNIT
TEST CONDITIONS
MIN
TYP
2.53
2.53
4.55
7.6
10.8
13.5
10
MAX
V
Reference voltage
V
ref
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
TL7702A
TL7705A
TL7709A
TL7712A
TL7715A
TL7702A
V
Negative-going input threshold voltage, SENSE
V
IT–
hys
15
V
Hysteresis, SENSE (V
– V
)
IT–
20
mV
IT+
35
45
I
I
Input current, SENSE
Supply current
V
< V < V – 1.5 V
CC
0.5
1.8
µA
I
ref
All inputs and outputs open
to GND.
I
mA
CC
†
All electrical characteristics are measured with 0.1-µF capacitors connected at REF, CT, and V
CC
switching characteristics over recommended operating conditions, T = 25°C (unless otherwise
A
noted)
TL77xxAY
‡
PARAMETER
Output pulse time delay
UNIT
TEST CONDITIONS
MIN
TYP
MAX
t
d
C
= 0.1 µF
1.2
µs
T
‡
All switching characteristics are measured with 0.1-µF capacitors connected at REF and V
to GND.
CC
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
PARAMETER MEASUREMENT INFORMATION
Voltage
Drop
t
w(S)
V
V
IT–
IT+
V
IT+
SENSE
RESIN
0 V
V
IH
Undefined
2 V
0.7 V
V
IL
t
f
t
t
r
pd
V
OH(RESET)
90%
90%
90%
RESET
RESET
50%
50%
10%
90%
t
d
t
t
d
t
d
f
10%
10%
10%
10%
V
OL(RESET)
t
r
Figure 1. Voltage Waveforms
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
†
TYPICAL CHARACTERISTICS
DEASSERTION TIME
vs
LOAD RESISTANCE
ASSERTION TIME
vs
LOAD RESISTANCE
7
6
5
4
3
42
38
34
30
26
22
18
V
C
C
= 5 V
= 0.1 µF
= 10 pF
= 25°C
V
C
C
= 5 V
= 0.1 µF
= 10 pF
= 25°C
CC
T
L
CC
T
L
T
A
T
A
RESET t
f
RESET t
r
2
1
0
RESET t
r
RESET t
4
f
0
2
4
6
8
10
0
2
6
8
10
R – Load Resistance – kΩ
L
R
– Load Resistance – kΩ
L
Figure 2
Figure 3
DEASSERTION TIME
vs
LOAD CAPACITANCE
ASSERTION TIME
vs
LOAD CAPACITANCE
3.6
3.2
2.8
2.4
2
44
V
C
R
= 5 V
= 0.1 µF
= 4.7 kΩ
= 25°C
CC
T
L
V
C
R
= 5 V
= 0.1 µF
= 4.7 kΩ
= 25°C
CC
T
L
40
36
32
28
24
20
T
A
T
A
RESET t
f
RESET t
r
RESET t
1.6
1.2
0.8
r
RESET t
f
0
25
50
75
100 125 150 175 200
0
25
50
C
75
100 125 150 175 200
C
– Load Capacitance – pF
– Load Capacitance – pF
L
L
Figure 4
Figure 5
†
For proper operation, both RESET and RESET should be terminated with resistors of similar value. Failure to do so may cause unwanted
plateauing in either output waveform during switching.
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
APPLICATION INFORMATION
5 V
12 V
8
8
10 kΩ
22 kΩ
V
V
CC
SENSE
CC
7
2
7
2
SENSE
5
5
System Reset
RESET
RESET
RESIN
RESIN
TL7712A
RESET
TL7705A
RESET
6
1
10 kΩ
6
1
3
3
REF
CT
CT
REF
GND
4
10 kΩ
GND
4
10 kΩ
C
C
T
T
0.1 µF
0.1 µF
GND
td s
1.3 104
8
( )
CT(F)
V
CC
7
2
SENSE
5
6
RESET
RESIN
TL7712A
RESET
3
1
CT
REF
GND
4
10 kΩ
C
T
0.1 µF
–12 V
Figure 6. Multiple Power-Supply System Reset Generation
5 V
8
10 kΩ
V
CC
V
CC
7
2
SENSE
5
RESET
RESET
RESIN
TMS7000
td s
1.3 104
TL7705A
RESET
REF
( )
6
1
CT(F)
3
CT
V
SS
GND
10 kΩ
0.1 µF
4
C
T
GND
Figure 7. Reset Controller for TMS7000 System
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
APPLICATION INFORMATION
5 V
µA7805
4.7 kΩ
25 kΩ
8
INPUT OUTPUT
V
System RESET
CC
SENSE
7
3
S
Input
G
5
RESET
TL7705A
RESET
Q1
2N3994
COMMON
6
1
D
CT
T
REF
GND
4
4.7 kΩ
C
C
C
I
O
0.1 µF
Figure 8. Eliminating Undefined States Using a P-Channel JFET
V
CC
10 kΩ
750 Ω
Q1
2N4036
8
2.7 kΩ
V
CC
System RESET
7
2
5
SENSE Input
SENSE
RESET
TL77xxA
6
1
RESET
RESIN
3
10 kΩ
1 kΩ
CT
T
REF
GND
4
C
0.1 µF
Figure 9. Eliminating Undefined States Using a pnp Transistor
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
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