tl7705acp-a STMicroelectronics, tl7705acp-a Datasheet

tl7705acp-a

Manufacturer Part Number

tl7705acp-a

Description

Supply Voltage Supervisors

Manufacturer

STMicroelectronics

Datasheet

1.TL7705ACP-A.pdf (7 pages)

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DESCRIPTION

The TL7700A series are monolithic supply voltage

supervisor IC’s specifically designed for use as reset

controllers in microcomputer and microprocessor

systems. During power-up the device tests the sup-

ply voltage and keeps the RESET and RESET out-

puts active (high and low, respectively) as long as

the supply voltage has not reached its nominal volt-

age value. Taking RESIN low has the same effect.

To ensure that the microcomputer system has reset,

the TL7700A then initiates an internal time count

that delays the return of the reset outputs to their in-

active states. Since the time delay for most micro-

computers and microprocessors is in the order of

several machine cycles, the device internal time de-

lay is determined by an external capacitor con-

nected to the C

Where : C

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 ex-

ternal capacitor (typically 0.1 F) 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 – 25

acterized from 0

July 2000

po = 1.3 x 10

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

C to 85

is in farads (F) and t

x C

input (pin 3).

C to 70

C ; the TL7700AC series is char-

in seconds (s). In

SUPPLY VOLTAGE SUPERVISORS

ORDERING NUMBERS

PIN CONNECTION (top view)

Temperature Range

-25 to 85

0 to 70

TL7700A Series

Minidip

TL77XXACP

TL77XXAIP

SO8

Minidip

TL77XXACD

TL77XXAID

S08

1/7

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tl7705acp-a Summary of contents

Page 1

POWER-ON RESET GENERATOR AUTOMATIC RESET GENERATION AFTER . VOLTAGE DROP WIDE SUPPLY VOLTAGE RANGE ... 18V . PRECISION VOLTAGE SENSOR TEMPERATURE-COMPENSATED VOLTAGE . REFERENCE . TRUE AND COMPLEMENT RESET OUTPUTS EXTERNALLY ADJUSTABLE PULSE WIDTH ...

Page 2

TL7700A Series BLOCK DIAGRAM * TL7702A open ; TL7705A 10k ; TL7709A 10k ; TL7712A R1 = 32. ...

Page 3

ELECTRICAL CHARACTERISTICS these specifications unless otherwise specified, apply for : – (TLXXAI), T amb Symbol Parameter V High-level Output Voltage at RESET OH V Low-Level Output Voltage at RESET OL V Reference Voltage ref ...

Page 4

TL7700A Series Figure 1 : Reset Controller for P 4/7 TL7705 ...

Page 5

DIM. MIN. TYP. MAX. MIN. A 1.75 a1 0.1 0.25 0.004 a2 1.65 a3 0.65 0.85 0.026 b 0.35 0.48 0.014 b1 0.19 0.25 0.007 C 0.25 0.5 0.010 c1 45 (typ.) D (1) 4.8 5.0 0.189 E 5.8 ...

Page 6

TL7700A Series mm DIM. MIN. TYP. MAX. A 3.32 a1 0.51 0.020 B 1.15 1.65 0.045 b 0.356 0.55 0.014 b1 0.204 0.304 0.008 D 10.92 E 7.95 9.75 0.313 e 2.54 e3 7.62 e4 7.62 F 6.6 I 5.08 ...

Page 7

... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi- croelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...

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