TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Power-On Reset Generator
D
Automatic Reset Generation After Voltage
Drop
D
Wide Supply-Voltage Range
D
Precision Voltage Sensor
D
Temperature-Compensated Voltage
Reference
D
True and Complement Reset Outputs
D
Externally Adjustable Pulse Duration
D
Package Options Include Plastic
Small-Outline (D) Package and Standard
Plastic (P) DIP
description
The TL77xxA family of integrated-circuit supply-voltage supervisors is designed specifically 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 VCC attains a value approaching 3.6 V . At this point (assuming that SENSE is above VIT+), the delay timer
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, 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 external capacitor
CT: td = 1.3 × 104 × CT, where CT is in farads (F) and td is in seconds (s).
During power down and when SENSE is below VIT–, the outputs remain active until VCC falls below 2 V. After
this, the outputs are undefined.
An external capacitor (typically 0.1 µF) 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
TASMALL
OUTLINE
(D)
PLASTIC
DIP
(P)
0°C to 70°C
TL7702ACD
TL7705ACD
TL7709ACD
TL7712ACD
TL7715ACD
TL7702ACP
TL7705ACP
TL7709ACP
TL7712ACP
TL7715ACP
–40°C to 85°CTL7702AID
TL7705AID TL7702AIP
TL7705AIP
The D package is available taped and reeled. Add the
suffix R to the device type (e.g., TL7702ACDR).
Copyright 2001, 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.
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.
1
2
3
4
8
7
6
5
REF
RESIN
CT
GND
VCC
SENSE
RESET
RESET
D OR P PACKAGE
(TOP VIEW)
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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.
RESIN
≈100 µA
R1
(see Note A)
6
5
1
Reference
Voltage
SENSE
GND
8
3
7
2
4
VCC
CT
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.
RESET
RESET
R2
(see Note A)
timing diagram
Output
Undefined
RESET
ÎÎ
ÎÎ
td
Output
Undefined
VCC and SENSE
td
Threshold Voltage
VCC ≈ 3.6 V VCC ≈ 2 V
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage, VCC (see Note 1) 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI, RESIN –0.3 V to 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI, SENSE:TL7702A (see Note 2) –0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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, IOH, RESET –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low-level output current, IOL, RESET 30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Notes 3 and 4): D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
P package 85°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or P package 260°C. . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†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 af fect device reliability.
NOTES: 1. All voltage values are with respect to GND.
2. For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed VCC – 1 V or 6 V, whichever
is less.
3. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
4. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions
MIN MAX UNIT
VCC Supply voltage 3.5 18 V
VIH High-level input voltage at RESIN 2 V
VIL Low-level input voltage at RESIN 0.6 V
TL7702A 0 See Note 2
TL7705A 0 10
VIInput voltage, SENSE TL7709A 0 15 V
TL7712A 0 20
TL7715A 0 20
IOH High-level output current, RESET –16 mA
IOL Low-level output current, RESET 16 mA
CTT iming capacitor 10 µF
TA
O
p
erating free air tem
p
erature range
TL77xxAC 0 70
°C
T
A
Operating
free
-
air
temperature
range
TL77xxAI –40 85
°C
NOTE 2: For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed VCC – 1 V or 6 V , whichever is less.
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS
†
TL77xxAC
TL77xxAI UNIT
MIN TYP MAX
VOH High-level output voltage, RESET IOH = –16 mA VCC–1.5 V
VOL Low-level output voltage, RESET IOL = 16 mA 0.4 V
Vref Reference voltage TA = 25°C 2.48 2.53 2.58 V
TL7702A 2.48 2.53 2.58
Nti iitthhldlt
TL7705A 4.5 4.55 4.6
VIT–Negative-going input threshold voltage,
SENSE
TL7709A TA = 25°C7.5 7.6 7.7 V
SENSE
TL7712A 10.6 10.8 11
TL7715A 13.2 13.5 13.8
TL7702A 10
TL7705A 15
Vh
y
sHysteresis, SENSE (VIT+ – VIT–)TL7709A TA = 25°C20 mV
y
TL7712A 35
TL7715A 45
RESIN
VI = 2.4 V to VCC 20
IIInput current
RESIN
VI = 0.4 V –100 µA
SENSE TL7702A Vref < VI < VCC – 1.5 V 0.5 2
IOH High-level output current, RESET VO = 18 V 50 µA
IOL Low-level output current, RESET VO = 0 –50 µA
ICC Supply current All inputs and outputs open 1.8 3 mA
†All electrical characteristics are measured with 0.1-µF capacitors connected at REF, CT, and VCC to GND.
switching characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS
‡
TL77xxAC
TL77xxAI UNIT
MIN TYP MAX
Output pulse duration CT = 0.1 µF 0.65 1.2 2.6 msec
Input pulse duration at RESIN 0.4 µs
tw(S) Pulse duration
at SENSE input to switch outputs VIH = VIT– +200 mV, VIL = VIT– –200 mV 2µs
tpd Propagation delay time, RESIN to RESET VCC = 5 V 1µs
t
RESET
VCC =5V
See Note 5
0.2
µs
t
r
RESET
V
CC =
5
V
,
See
Note
5
3.5 µ
s
tf
RESET
VCC =5V
See Note 5
3.5
µs
t
f
RESET
V
CC =
5
V
,
See
Note
5
0.2 µ
s
‡All switching characteristics are measured with 0.1-µF capacitors connected at REF and VCC to GND.
NOTE 5: The rise and fall times are measured with a 4.7-kΩ load resistor at RESET and RESET.
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
0.7 V
tpd
10%
90%
tw(S)
10%
VIT+ VIT–VIT+
0 V
VIH
VIL
2 V
50%
50%
10%
10%
90%
10%
td
SENSE
Undefined
RESET
Voltage
Drop
tftr
90%
tftd
tr
RESIN
RESET
ÎÎ
ÎÎ
td
90% VOH(RESET)
VOL(RESET)
Figure 1. Voltage Waveforms
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS†
Figure 2
30
26
22
18 0246
34
38
ASSERTION TIME
vs
LOAD RESISTANCE
42
810
t – Assertion Time – ns
RL – Load Resistance – kΩ
RESET tr
RESET tf
VCC = 5 V
CT = 0.1 µF
CL = 10 pF
TA = 25°C
Figure 3
4
3
2
1
0246
t – Deassertion Time –
5
6
DEASSERTION TIME
vs
LOAD RESISTANCE
7
810
0
sµ
RL – Load Resistance – kΩ
RESET tf
RESET tr
VCC = 5 V
CT = 0.1 µF
CL = 10 pF
TA = 25°C
Figure 4
32
28
24
200 25 50 75 100 125
36
40
ASSERTION TIME
vs
LOAD CAPACITANCE
44
150 175 200
RESET tr
RESET tf
VCC = 5 V
CT = 0.1 µF
RL = 4.7 kΩ
TA = 25°C
t – Assertion Time – ns
CL – Load Capacitance – pF
Figure 5
2.4
2
1.6
1.2
2.8
3.2
DEASSERTION TIME
vs
LOAD CAPACITANCE
3.6
RESET tf
RESET tr
VCC = 5 V
CT = 0.1 µF
RL = 4.7 kΩ
TA = 25°C
0 25 50 75 100 125 150 175 200
CL – Load Capacitance – pF
0.8
t – Deassertion Time –sµ
†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.
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
22 kΩ
0.1 µF
SENSE
RESIN
GND
RESET
RESET
VCC
CT
System Reset
10 kΩ
CT
10 kΩ
0.1 µF
SENSE
RESIN
GND
RESET
RESET
VCC
CT
0.1 µF
SENSE
RESIN
GND
REF
RESET
VCC
CT
CT
CT
5 V
12 V
–12 V
GND
TL7712A TL7705A
TL7712A
RESET
10 kΩ
10 kΩ
REF
10 kΩ
REF
8
7
2
3
4
1
6
5
8
7
2
3
4
1
6
5
8
7
2
3
4
1
6
5
CT(F)
+
td(s)
1.3
104
Figure 6. Multiple Power-Supply System Reset Generation
5 V
10 kΩ
0.1 µF
SENSE
RESIN
GND
REF
RESET
VCC
CT
CT
RESET
VCC
GND
VSS
TMS7000
TL7705A
10 kΩ
RESET
8
7
2
3
4
1
6
5
CT(F)
+
td(s)
1.3
104
Figure 7. Reset Controller for TMS7000 System
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028G – APRIL 1983 – REVISED MAY 2001
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
4.7 kΩ
0.1 µF
SENSE
GND REF
RESET
VCC
CT
CT
TL7705A
INPUT OUTPUT
CO
CI
COMMON
25 kΩ
GS
D
Q1
2N3994
5 V
µA7805
RESET
4.7 kΩ
System RESET
8
7
3
4
1
6
5
Input
Figure 8. Eliminating Undefined States Using a P-Channel JFET
2.7 kΩ
0.1 µF
SENSE
GND REF
RESIN
VCC
CT
CT
TL77xxA
RESET
750 Ω
System RESET
Q1
2N4036
VCC
10 kΩ1 kΩ
10 kΩ
RESET
8
7
3
4
1
6
5
SENSE Input
2
Figure 9. Eliminating Undefined States Using a pnp Transistor
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Copyright 2001, Texas Instruments Incorporated