Texas Instruments TL7770-5QDWR, TL7770-5QDW, TL7770-5MFKB, TL7770-5MJB, TL7770-5QN Datasheet

TL7770-5, TL7770-12

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

D

Power-On Reset Generator

D

Automatic Reset Generation After Voltage
Drop

D

RESET Defined When VCC Exceeds 1 V

D

Wide Supply-Voltage Range . . . 3.5 V
to 18 V

D

Precision Overvoltage and Undervoltage
Sensing

D

250-mA Peak Output Current for Driving
SCR Gates

D

2-mA Active-Low SCR Gate Drive for

1SCR DRIVE

DW OR N PACKAGE

(TOP VIEW)

1RESIN

1CT
1RESET
1RESET

1VSU
1VSO

GND

1
2
3
4
5
6
7
8

CC

2RESIN

15

2CT

14

2RESET

13

2RESET

12

2VSU

11

2VSO

10

2SCR DRIVE

9

V

16

False-Trigger Protection

D

T emperature-Compensated Voltage
Reference

D

True and Complementary Reset Outputs

D

Externally Adjustable Output Pulse
Duration

description

The TL7770 is an integrated-circuit system supervisor designed for use as a reset controller in microcomputer
and microprocessor power-supply systems. This device contains two independent supply-voltage supervisors
that monitor the supplies for overvoltage and undervoltage conditions at the VSO and VSU terminals,
respectively . When V
(low). As VCC approaches 3.5 V , the time-delay function activates, latching RESET and RESET active (high and
low, respectively) for a time delay (td) after system voltages have achieved normal levels. Above VCC = 3.5 V,
taking RESIN low activates the time-delay function during normal system-voltage levels. To ensure that the
microcomputer system has reset, the outputs remain active until the voltage at VSU exceeds the threshold
value, V

, for a time delay, which is determined by an external timing capacitor such that:

IT+

attains the minimum voltage of 1 V during power up, the RESET output becomes active

CC

td[20

103

capacitance

where td is in seconds and capacitance is in farads.
The overvoltage-detection circuit is programmable for a wide range of designs. During an overvoltage condition,

an internal silicon-controlled rectifier (SCR) is triggered, providing 250-mA peak instantaneous current and
25-mA continuous current to the SCR gate drive terminal, which can drive an external high-current SCR gate
or an overvoltage-warning circuit.

The TL7770C series is characterized for operation from 0°C to 70°C. The TL7770I series is characterized for
operation from –40°C to 85°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.

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.

Copyright  1999, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

TL7770-5, TL7770-12

CHIP FORM

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

T

A

0°C to 70°C
–40°C to 85°C TL7770-5IDW TL7770-5IN —

DW package is available taped and reeled. Add the suffix R to the device type
(e.g., TL7770-5CDWR). Chip forms are tested at 25°C.

functional block diagram (each channel)

V

CC

V

ref

SMALL OUTLINE

TL7770-5CDW
TL7770-12CDW

AVAILABLE OPTIONS
PACKAGED DEVICES

PLASTIC DIP

(DW)

TL7770-5CN
TL7770-12CN

65 µA (TYP)

(N)

(Y)

TL7770-5Y
TL7770-12Y

CT

VSU

R1

R2

RESIN

VSO

DEVICE

TL7770-5
TL7770-12

†

The values listed are nominal.

1 VSU 2 VSU

†

R1

24 kΩ
70 kΩ

R2

10 kΩ
10 kΩ

†

R1 R2

Short
Short

Open
Open

RESET

RESET

SCR DRIVE

2 mA

(TYP)

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

ООООООО

timing requirements

V

IT+

V

IT–

TL7770-5, TL7770-12

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

VSU

RESET

V

VSO

SCR DRIVE

t

d

Undefined Operation
for VCC Less Than 1 V

T

t

d

t

d

VCC = 1 V (TYP)

V

OH

V

OL

V

OH

V

OL

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, VCC (see Note 1) 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI: 1VSU, 2VSU, 1VSO, and 2VSO (see Note 1) –0.3 V to 18 V. . . . . . . . . . . . . . . . . . . .

Low-level output current (1RESET

High-level output current (1RESET and 2RESET), IOH –20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Notes 2 and 3): DW package 57°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 in) from case for 10 seconds: DW or N package 260°C. . . . . . . . . . . . . . . . .

Storage temperature range, T

†

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 TJ(max),
ambient temperature is PD = (TJ(max) – TA)/

3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.

and 2RESET), IOL 20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 88°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

θ

, and TA. The maximum allowable power dissipation at any allowable

θ

JA

JA

. Operating at the absolute maximum TJ of 150°C can impact reliability.

†

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TL7770-5, TL7770-12

Operating free-air temperature, T

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

recommended operating conditions

MIN MAX UNIT

Supply voltage, V
Input voltage range, VI (see Note 4) 1VSU, 2VSU, 2VSO, 1VSO 0 18 V
Output voltage, VO (1CT, 2CT) 5 V
High-level input voltage range, VIH (1RESIN, 2RESIN) 2 18 V
Low-level input voltage range, VIL (1RESIN, 2RESIN) 0 0.8 V
Output sink current, IO (1CT, 2CT) 50 µA
High-level output current, IOH (1RESET, 2RESET) –16 mA
Low-level output current, IOL (1RESET, 2RESET) 16 mA
Continuous output current, IO (1SCR DRIVE, 2SCR DRIVE) 25 mA
Timing capacitor , C

p

NOTE 4: The algebraic convention, in which the least positive (most negative) value is designated minimum, is used in this data sheet for logic

voltage levels only .

CC

T

p

A

TL7770C series 0 70 °C
TL7770I series –40 85 °C

3.5 18 V

10 µF

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

CONDITIONS

VOHHigh-level output voltage

V

V

IT

T

A

MIN to MAX

V

V

h

T

A

MIN to MAX

mV

IIInput current

A

†

ICCSupply current

1RESIN and 2RESIN at V

CC

mA

TL7770-5, TL7770-12

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

electrical characteristics over recommended operating conditions (unless otherwise noted)

supply supervisor section

TL7770-5C

PARAMETER

p

V

V

I

OH

I

OL

I

OH

†

For conditions shown as MIN or MAX, use the appropriate value specified in the recommended operating conditions.

‡

Typical values are at VCC = 5 V, TA = 25°C.

Low-level output voltage RESET IOL = 15 mA 0.4 V

OL

Undervoltage input threshold

–

at VSU (negative-going)

Hysteresis at VSU

ys

(V

– V

IT–

)

IT+

Overvoltage threshold at VSO TL7770-5, TL7770-12 (VSO) TA = MIN to MAX 2.48 2.68 V

T

p

High-level output current RESET VO = 18 V 50 µA
Low-level output current RESET VO = 0 –50 µA
Peak output current SCR DRIVE Duration = 1 ms 250 mA

RESET IOH = –15 mA VCC–1.5
SCR DRIVE IOH = –20 mA VCC–1.5

TL7770-5 (5-V sense, 1VSU) 4.46 4.64
TL7770-12 (12-V sense, 1VSU)
TL7770-5, TL7770-12

(programmable sense, 2VSU)
TL7770-5 (5-V sense, 1VSU) 15
TL7770-12 (12-V sense, 1VSU)
TL7770-5, TL7770-12

(programmable sense, 2VSU)

RESIN VI = 5.5 V or 0.4 V –10
VSO VI = 2.4 V 0.5 2

TEST

CONDITIONS

=

=

†

TL7770-12C

TL7770-5I

MIN TYP‡MAX

10.68 11.12

1.47 1.53

36

5

UNIT

µ

total device

PARAMETER

§

V

†

For conditions shown as MIN or MAX, use the appropriate value specified in the recommended operating conditions.

‡

Typical values are at VCC = 5 V, TA = 25°C.

§

This is the lowest voltage at which RESET

Power-up reset voltage VCC = VSU 0.8 1 V

res

1VSU = 18 V, 2VSU = 2 V,

pp

1VSO and 2VSO at 0 V

becomes active.

TEST CONDITIONS

,

MIN TYP‡MAX

TA = 25°C 5
TA = MIN to MAX 6.5

TL7770-5C

TL7770-12C

TL7770-5I

UNIT

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TL7770-5, TL7770-12

CONDITIONS

V

IT

T

A

MIN to MAX

V

V

h

T

A

MIN to MAX

mV

RESET

g

ns

RESET

ns

t

)

Minimum effective ulse duration

ns

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

electrical characteristics over recommended operating conditions (unless otherwise noted)

supply supervisor section

TL7770-5Y

TL7770-12Y

MIN TYP†MAX

10.68 11.12

1.47 1.53

36

5

TL7770-5Y

TL7770-12Y

MIN TYP†MAX

PARAMETER

Undervoltage input threshold at VSU

–

(negative-going)

Hysteresis at VSU

ys

(V

– V

IT–

)

IT+

V
I

I

†

Typical values are at VCC = 5 V, TA = 25°C.

Overvoltage threshold at VSO TL7770-5, TL7770-12 (VSO) TA = MIN to MAX 2.48 2.68 V

T

Input current VSO VI = 2.4 V 0.5 µA

total device

PARAMETER TEST CONDITIONS

‡

V

I

CC

†

Typical values are at VCC = 5 V, TA = 25°C.

‡

This is the lowest voltage at which RESET

Power-up reset voltage VCC = VSU, VOL = 0.4 V, IOL = 1 mA 0.8 V

res

Supply current

TL7770-5 (5-V sense, 1VSU) 4.46 4.64
TL7770-12 (12-V sense, 1VSU)
TL7770-5, TL7770-12

(programmable sense, 2VSU)
TL7770-5 (5-V sense, 1VSU) 15
TL7770-12 (12-V sense, 1VSU)
TL7770-5, TL7770-12

(programmable sense, 2VSU)

1VSU = 18 V, 2VSU = 2 V,
1RESIN

and 2RESIN at VCC,

1VSO and 2VSO at 0 V

becomes active.

TEST

=

=

TA = 25°C 5 mA

UNIT

UNIT

switching characteristics, VCC = 5 V, CT open, TA = 25°C

FROM

(INPUT)TO(OUTPUT)

RESIN
RESIN RESET

RESIN

VSU See Figure 2b 100

RESET 270 500 ns

t

PLH

t

PHL

t

r

t

f

t

r

t

f

w(min

PARAMETER

Propagation delay time, low-to-high-level output
Propagation delay time, high-to-low-level output
Rise time
Fall time
Rise time
Fall time

p

TEST

CONDITIONS

See Figures 1

and 3

See Figure 2a 150

MIN TYP MAX UNIT

270 500 ns

150

75

75

50

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL7770-5, TL7770-12

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

PARAMETER MEASUREMENT INFORMATION

5 V

511 Ω

RESET

DUT

GND

RESET OUTPUT CONFIGURATION

NOTE A: This includes jig and probe capacitance.

15 pF
(see Note A)

Figure 1. RESET and RESET Output Configurations

t

w

a) RESIN

5 V

2.5 V
0 V

WAVEFORMS

5 V

V

CC

DUT

RESET

511 Ω

RESET OUTPUT CONFIGURATION

t

w

b) VSU

15 pF
(see Note A)

VIT + 2 V

V
VIT – 2 V

IT

VSU

RESIN

RESET

RESET

Undefined

V

t

90%

t

10%

t

r

IT+

f

d

Figure 2. Input Pulse Definition

Voltage

Fault

V

IT+

t

PLH

90%

t

d

10%10%

t

PHL

10%

90%

V

IT–

t

r

t

f

0.8 V

50%

50%

2 V

0 V

V

IH

V

IL

V

OH

90%

t

d

10%

V

OL

Figure 3. Voltage Waveforms

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7

TL7770-5, TL7770-12
DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

APPLICATION INFORMATION

V

S

16

V

1VSU
1RESIN

1CT

ƫ

C

T

CC

1RESET

1RESET

GND

8

5

10

1

C

T

*

5

Ǔ

R

5

T

Reset Input

(from system)

R

T

(see Note B)

NOTE B: When VCC and 1VSU are connected to the same point, it is recommended that series resistance (RT) be added between the time-delay

programming capacitor (CT) and the voltage-supervisor device terminal (1CT). The suggested RT value is given by:

VI*

V

IT

1 10

*

*

, where VI+ǒthe lesser of 7.1 V or V

*

3

ǒ

ƪ

(

6.5E*5)

6.5 10

*

u

R

T

When this series resistor is used, the td calculation is as follows:

1.3

t

+

d

4

32

Ǔ

S

10 kΩ

10 kΩ

System Supply

To System Reset

To System Reset

Figure 4. System Reset Controller With Undervoltage Sensing

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

IMPORTANT NOTICE

T exas 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 APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD 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