TL7700.pdf part of SGS-Thomson TL7700 TL7700.pdf, Supply voltage supervisors text manual preview

Text preview for : TL7700.pdf part of SGS-Thomson TL7700 Supply voltage supervisors

Back to : TL7700.pdf | Home

TL7700 A 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 Min id ip

DESCRIPTION The TL7700Aseries are monolithic integratedcircuit supplyvoltage supervisors specifically desi-gnedfor 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 delay that delays the return of the reset outputs to their inactive states. Since the time delay for most microcomputersand microprocessors is in the order of several machine cycles, the device internal time delay is determined by an external time delay is determined by an external capacitor connected to the CT input (pin 3). td = 1.3 x 104 x CT Where : CT is in farads (F) and td 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 externalcapacitor (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.
April 1993

D SO8

ORDERING NUMBERS
Temperature Range 0 to 70 C -25 to 85 C
o o

Minidip TL77XXACP TL77XXAIP

S08 TL77XXACD TL77XXAID

PIN CONNECTION (top view)

1/7

TL7700A Series
BLOCK DIAGRAM

* TL7702A R1 = 0, R2 = open ; TL7705A R1 = 7.8 K, R2 = 10k ; TL7709A R1 = 19.7 K, R2 = 10k ; TL7712A R1 = 32.7k, R2 = 10k ; TL7715A R1 = 43.4 K, R2 = 10k.

ABSOLUTE MAXIMUM RATINGS
Symbol VS Vi Vi Parameter Supply Voltage, VCC - (see note 1) Input Voltage Range at RESIN Input Voltage at SENSE : TL7702A (see note 2) TL7705A TL7709A TL7712A TL7715A Value 20 -0.3 to 20 -0.3 to 6 -0.3 to 10 -0.3 to 15 -0.3 to 20 -0.3 to 20 -30 30 -25 to 85 0 to 70 -65 to 150
o

Unit V V V

IOH IOL Tamb

High-level Output Current at RESET Low-level Output Current at RESET Operating Free-air Temperature Range : TL77XXAI TL77XXAC Storage Temperature Range

mA mA
o

C

Tstg

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 Vs.

THERMAL DATA
Symbol R th j-amb Parameter Thermal Resistance Junction-ambient Max. Value 120 Unit
o

C/W

RECOMMENDED OPERATING CONDITIONS
Symbol VS VIH VIL Vi Supply Voltage High-level Input Voltage at RESIN Low-level Input Voltage at RESIN Voltage at Sense Input TL7702A TL7705A TL7709A TL7712A TL7715A 0 0 0 0 0 Parameter Min. 3.6 2 0.6 See note 3 10 15 20 20 -16 16 -25 0 85 70 Max. 18 Unit V V V V

IOH IOL Tamb
Note :

High-level Output Current at RESET Low-level Output Current at RESET Operating Free-air Temperature Range TL77-AI TL77-AC

mA mA
o

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.

2/7

TL7700A Series
ELECTRICAL CHARACTERISTICS these specifications unless otherwise specified, apply for : Tamb = 25 to 85oC (TLXXAI), Tamb = 0 to 70oC (TL77XXAC)
Symbol VOH VOL Vref VT Parameter High-level Output Voltage at RESET Low-Level Output Voltage at RESET Reference Voltage Threshold Voltage at SENSE Input TL7702A TL7705A TL7709A TL7712A TL7715A TL7702A TL7705A TL7709A TL7712A TL7715At TL7702A TL7705A TL7709A TL7712A TL7715A Test Conditions (1) IOH = 16mA IOL = 16mA Tamb = 25 C Vs = 3.6V to 18V Tamb = 25oC
o

Min. Vs 1.5

Typ.

Max.

Unit V

0.4 2.48 2.48 4.5 7.5 10.6 13.2 2.45 4.45 7.4 10.4 13 2.53 2.53 4.55 7.6 10.8 13.5 2.53 4.55 7.6 10.8 13.5 10 15 20 35 45 20 -100 0.5 50 -50 1.8 3.3 2 2.58 2.58 4.6 7.7 11 13.8 2.58 4.6 7.7 11 13.8

V V V

VT

Threshold Voltage at SENSE Inpu

Vs = 3.6V to 18V

V

VT+, VT

Hysteresis (2) at SENSE Input

Vs = 3.6V to 18V Tamb = 25oC

mV

II II IOH IOL IS

Input Current at RESIN Input Input Current at SENSE Input High-level Output Current at RESET Low-level Output Current at RESET Supply Current TL7702A

Vi = 2.4V to VS Vi = 0.4V Vref < Vi < Vs - 1.5V VO = 18V VO = 0V All Inputs and out. open

µA µA µA µA 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. VT+, and the negative going input threshold voltage, VT-.

SWITCHING CHARACTERISTICS
Symbol tpi tpi tpo tpdHL tr/f Parameter Pulse Width at SENSE Input Pulse Width at RESIN Input Pulse Width at Output Propagation Delay Time from RESIN to RESET Rise/Falltime at RESET and RESET C f = 0.1µF C L = 100pF, V s = 5V, R L = 4.7k C L = 10pF, Vs = 5V, RL = 4.7k Test Conditions Vih = Vityp +0.04 x Vi ViL = Vityp 0.04 x Vi Min. 0.9 0.4 0.65 1.3 2.6 1 1 Typ. Max. Unit µs µs ms µs µs

3/7

TL7700A Series
Figure 1 : Multiple Power Supply System Reset Generation

Figure 2 : Reset Controller for µP

4/7

TL7700A Series
SO8 PACKAGE MECHANICAL DATA
DIM. MIN. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8° (max.) 0.15 0.016 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm TYP. MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45° (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.024 0.197 0.244 0.026 0.014 0.007 0.010 0.004 MIN. inch TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020

5/7

TL7700A Series
MINIDIP PACKAGE MECHANICAL DATA
DIM. MIN. A a1 B b b1 D E e e3 e4 F I L Z 3.18 7.95 2.54 7.62 7.62 6.6 5.08 3.81 1.52 0.125 0.51 1.15 0.356 0.204 1.65 0.55 0.304 10.92 9.75 0.313 0.100 0.300 0.300 0.260 0.200 0.150 0.060 mm TYP. 3.32 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384 MAX. MIN. inch TYP. 0.131 MAX.

6/7

TL7700A Series

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.

7/7