TL7700CPW [TI]
SUPPLY-VOLTAGE SUPERVISOR; 供给电压监控器
| 型号： | TL7700CPW |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | SUPPLY-VOLTAGE SUPERVISOR |
| 文件： | 总11页 (文件大小：147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
P, PS, OR PW PACKAGE
(TOP VIEW)
Adjustable Sense Voltage With Two
External Resistors
Adjustable Hysteresis of Sense Voltage
CT
SENSE
NC
RESET
NC
NC
1
2
3
4
8
7
6
5
Wide Operating Supply-Voltage
Range . . . 1.8 V to 40 V
GND
V
Wide Operating-Temperature
CC
Range . . . –40°C to 85°C
NC – No internal connection
Low Power Consumption (I
= 0.6 mA
CC
TYP, V
= 40 V)
CC
Minimum External Components
Package Options Include Plastic
Small-Outline (PS) and Thin Shrink
Small-Outline (PW) Packages and Standard
DIP (P)
description
The TL7700 is a bipolar integrated circuit designed for use as a reset controller in microcomputer and
microprocessor systems. The SENSE voltage can be set to any value greater than 0.5 V using two external
resistors. The hysteresis value of the sense voltage also can be set by the same resistors. The device includes
a precision voltage reference, fast comparator, timing generator, and output driver, so it can generate a
power-on reset signal in a digital system.
The TL7700 has an internal 1.5-V temperature-compensated voltage reference from which all function blocks
are supplied. Circuit function is very stable, with supply voltage in the 1.8-V to 40-V range. Minimum supply
current allows use with ac line operation, portable battery operation, and automotive applications.
The TL7700C is characterized for operation from –40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
PLASTIC
T
A
PLASTIC
DIP
PLASTIC
SMALL OUTLINE
(PS)
THIN SHRINK
SMALL OUTLINE
(PW)
(P)
–40°C to 85°C
TL7700CP
TL7700CPS
TL7700CPW
PSandPWpackagesareavailabletapedandreeled. Addthesuffix R to device type
(e.g., TL7700CPSR).
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
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
functional block diagram
V
CC
V
s
= 500 mV TYP
RESET
Reference
Voltage
+
–
+
–
+
–
SENSE
†
I
CT
High:
On
R
S
Q
†
I
S
GND
†
I
= 15 µA TYP; I = 2.5 µA TYP
s
CT
CT
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
Timing capacitor connection. This terminal sets the RESET output pulse duration (t ). It is connected internally to a
po
15-µA constant-current source. There is a limit on the switching speed of internal elements; even if CT is set to 0,
response speeds remain at approximately 5 to 10 µs. If CT is open, the device can be used as an adjustable-threshold
noninverting comparator. If CT is low, the internal output-stage comparator is active and the RESET output transistor
is on. An external voltage must not be applied to this terminal due to the internal structure of the device. Therefore, drive
the device using an open-collector transistor, FET, or 3-state buffer (in the low-level or high-impedance state).
CT
1
GND
NC
4
Ground. Keep this terminal as low impedance to reduce circuit noise.
No internal connection
3, 6, 7
8
Reset output. This terminal can be connected directly to a system that resets in the active-low state. A pullup resistor
usually is required because the output is an npn open-collector transistor. An additional transistor should be connected
when the active-high reset or higher output current is required.
RESET
SENSE
Voltage sense. This terminal has a threshold level of 500 mV. The sense voltage and hysteresis can be set at the same
timewhenthetwovoltage-dividingresistorsareconnected.Thereferencevoltageistemperaturecompensatedtoinhibit
temperature drift in the threshold voltage within the operating temperature range.
2
5
V
CC
Power supply. This terminal is used in an operating-voltage range of 1.8 V to 40 V.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V
CC
Sense input voltage range, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 41 V
s
Output voltage, V
(off state) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V
OH
Output current, I (on state) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
OL
Package thermal impedance, θ (see Notes 2 and 3): P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85°C/W
JA
PS package . . . . . . . . . . . . . . . . . . . . . . . . . . . 95°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . 149°C/W
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. 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
3. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions
MIN NOM
MAX
40
UNIT
V
Supply voltage, V
CC
1.8
Low-level output current, I
3
mA
°C
OL
Operating free-air temperature, T
–40
85
A
electrical characteristics, V
= 3 V, T = 25°C (unless otherwise noted)
CC
A
PARAMETER
MIN
495
490
2
TYP
MAX
505
510
3
UNIT
TEST CONDITIONS
500
V
s
SENSE input voltage
mV
T
= –40°C to 85°C
A
2.5
0.6
I
I
SENSE input current
Supply current
V = 0.4 V
µA
mA
V
s
s
T
A
= –40°C to 85°C
1.5
3.5
1
V
= 40 V,
V = 0.6 V,
s
No load
CC
CC
I
= 1.5 mA
= 3 mA
0.4
0.8
1
OL
OL
V
OL
Low-level output voltage
I
I
I
High-level output current
V
= 40 V,
V = 0.6 V,
s
T = –40°C to 85°C
A
µA
µA
OH
OH
V = 0.6 V
Timing-capacitor charge current
11
15
19
CT
s
switching characteristics, V
= 3 V, T = 25°C (unless otherwise noted)
CC
A
PARAMETER
TEST CONDITIONS
MIN
2
TYP
MAX
UNIT
µs
t
t
t
t
t
SENSE pulse duration
Output pulse duration
Output rise time
C
C
C
C
C
= 0.01 µF
= 0.01 µF
= 0.01 µF,
= 0.01 µF,
= 0.01 µF
pi
po
r
T
T
T
T
T
0.5
1
1.5
15
ms
µs
R
R
= 2.2 kΩ,
= 2.2 kΩ,
C
C
= 100 pF
= 100 pF
L
L
L
L
Output fall time
0.5
10
µs
f
Propagation delay time, SENSE to output
µs
pd
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
PARAMETER MEASUREMENT INFORMATION
–
+
A
V
CC
V
s
SENSE
V
CC
0.6 V
GND
Figure 1. V
vs I
Measurement Circuit
CC
CC
V
CC
V
s
SENSE
CT
V
CC
+
A
0.6 V
GND
–
Figure 2. V
vs I
CT
CC
Test
Point
V
CC
RESET
CT
V
s
3 V
SENSE
0.4 V
GND
0.01 µF
Figure 3. I
vs V
OL
OL
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
PARAMETER MEASUREMENT INFORMATION
2.2 kΩ
V
CC
Test
Point
RESET
CT
V
s
+
–
V
CC
A
SENSE
V
s
GND
0.01 µF
Figure 4. V , I Characteristics
S
S
2.2 kΩ
V
CC
Test
Point
RESET
CT
V
s
3 V
SENSE
GND
100 pF
C
t
Figure 5. Switching Characteristics
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
†
TYPICAL CHARACTERISTICS
SUPPLY CURRRENT
vs
TIMING-CAPACITOR CHARGE CURRENT
vs
SUPPLY VOLTAGE
SUPPLY VOLTAGE
16
15
14
1.2
1.0
0.8
T
A
= –40 C
T
A
= 25 C
= 85 C
T
= 85 C
= 25 C
= –40 C
A
T
A
T
A
T
13
12
11
10
0.6
0.4
0.2
0
A
0
10
20
30
40
50
60
0
10
20
30
40
50
60
V
CC
– Supply Voltage – V
V
CC
– Supply Voltage – V
Figure 7
Figure 6
V
vs
SENSE INPUT VOLTAGE
vs
OL
I
TEMPERATURE
OL
506
504
1.2
1.0
T
= 25 C
= 500.8 mV
A
V
S
502
500
498
496
494
T
= 85 C
= 25 C
A
0.8
0.6
T
A
T
V
= 25 C
= 498.3 mV
T
A
= –40 C
0.4
0.2
A
S
492
490
488
0
–75 –50 –25
0
25 50 75 100 125 150
0
1
2
3
4
5
6
T
A
– Free-Air Temperature – °C
I
– Low-Level Output Current – mA
OL
Figure 8
Figure 9
†
Data at high and low temperatures are applicable only within the recommended operating conditions.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
†
TYPICAL CHARACTERISTICS
SENSE INPUT CURRENT
vs
SENSE INPUT VOLTAGE
SENSE INPUT CURRENT
vs
TEMPERATURE
3.5
3.0
3.4
3.2
2.5
2.0
1.5
1.0
0.5
3.0
2.8
2.6
2.4
2.2
0
2.0
1.8
1.6
–0.5
–1.0
0
0.1 0.2 0.3 0.4 0.5 0.6 1.0 10 40
–75 –50 –25
0
25 50 75 100 125 150
V
s
– Sense Input Voltage – V
T
A
– Free-Air Temperature – °C
Figure 10
Figure 11
OUTPUT PULSE DURATION
vs
TIMING CAPACATOR
9
8
10
10
7
10
6
10
5
10
4
10
3
10
2
1
1
10
10
1
2
3
4
5
6
7
8
9
1
10 10 10 10 10 10 10 10 10
C – Timing Capacitor – pF
t
Figure 12
†
Data at high and low temperatures are applicable only within the recommended operating conditions.
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
TYPICAL CHARACTERISTICS
Test
Point 1
TP1
2.2 kΩ
Test
240 kΩ
V
CC
RESET
Point 2
TP2
V
s
SENSE
6 V
CT
30 kΩ
GND
510 pF
100 pF
X-Axis = 0.2 ms/Division
Figure 13. V
vs Output Test Circuit 1
Figure 14. V
vs Output Waveform 1
CC
CC
Test
TP1
Point 1
2.2 kΩ
240 kΩ
V
CC
Test
Point 2
RESET
TP2
V
s
SENSE
6 V
CT
30 kΩ
GND
100 pF
510 pF
X-Axis = 0.2 ms/Division
Figure 15. V
vs Output Test Circuit 2
Figure 16. V
vs Output Waveform 2
CC
CC
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
TYPICAL CHARACTERISTICS
Test
Point 1
TP1
TP2
2.2 kΩ
240 kΩ
V
CC
Test
Point 2
RESET
V
s
SENSE
CT
30 kΩ
GND
100 pF
510 pF
X-Axis = 0.2 ms/Division
Figure 18. V
vs Output Waveform 3
Figure 17. V
vc Output Test Circuit 3
CC
CC
detailed description
sense-voltage setting
The sense voltage, V , of the TL7700 typically is 500 mV. By using two external resistors, the circuit designer
s
can obtain any sense voltage over 500 mV. In Figure 19, the sensing voltage, V′s, is calculated as:
V′s = V × (R1 + R2)/R2
s
Where:
V = 500 mV, typically at T = 25°C
s
A
At room temperature, V has a variation of 500 mV ± 5 mV. In the basic circuit shown in Figure 19, variations
s
of [±5 × (R1 + R2)/R2] mV are superimposed on V .
s
V
CC
R
L
V
R1
R2
CC
RESET
CT
RESET
V
s
SENSE
GND
C
t
GND
Figure 19
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL7700
SUPPLY-VOLTAGE SUPERVISOR
SLVS220A – JULY 1999 – REVISED NOVEMBER 1999
sense-voltage hysteresis setting
If the sense voltage, V , does not have hysteresis in it and the voltage on the sensing line contains ripples, the
s
resetting of TL7700 will be unstable. Hysteresis is added to the sense voltage to prevent such problems. As
shown in Figure 20, the hysteresis, V , is added, and the value is determined as:
hys
V
= I × R1
s
hys
Where:
I = 2.5 µA, typically at T = 25°C
s
A
At room temperature, I has variations of 2.5 µA ± 0.5 µA. Therefore, in the circuit shown in Figure 19, V
hys
has
s
variations of (±0.5 × R1) µV. In circuit design, it is necessary to consider the voltage-dividing resistor tolerance
and temperature coefficient in addition to variations in V and V
.
hys
s
V
CC
V
hys
V
s
1.5 V
T
RESET
t
t
po
po
T
Figure 20. V -RESET Timing Chart
CC
output pulse-duration setting
Constant-current charging starts on the timing capacitor when the sensing-line voltage reaches the TL7700
sense voltage. When the capacitor voltage exceeds the threshold level of the output drive comparator, RESET
changes from a low to a high level. The output pulse duration is the time between the point when the sense-pin
voltage exceeds the threshold level and the point when the RESET output changes from a low level to a high
level. When the TL7700 is used for system power-on reset, the output pulse duration, t , must be set longer
po
than the power rise time. The value of t is:
po
5
t
= C × 10 seconds
po
t
Where:
C is the timing capacitor in farads
t
There is a limit on the device response speed. Even if C = 0, t is not 0, but approximately 5 µs to 10 µs.
t
po
Therefore, when the TL7700 is used as a comparator with hysteresis, without connecting C , switching speeds
t
(t /t , t /t , etc.) must be considered.
r f po pd
10
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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