Datasheet > TL7770C

TL7770C

更新时间： 2024-10-28 04:28:11

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德州仪器 - TI		/
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描述
DUAL POWER-SUPPLY SUPERVISORS

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TL7770C 数据手册

TL7770-5, TL7770-12

DUAL POWER-SUPPLY SUPERVISORS

SLVS019F – OCTOBER 1987 – REVISED JULY 1999

DW OR N PACKAGE

(TOP VIEW)

Power-On Reset Generator

Automatic Reset Generation After Voltage

Drop

1RESIN

1CT

RESET Defined When V

Exceeds 1 V

2RESIN

2CT

1RESET

1VSU

Wide Supply-Voltage Range . . . 3.5 V

to 18 V

2RESET

2VSU

Precision Overvoltage and Undervoltage

Sensing

1VSO

2VSO

2SCR DRIVE

1SCR DRIVE

GND

250-mA Peak Output Current for Driving

SCR Gates

2-mA Active-Low SCR Gate Drive for

False-Trigger Protection

Temperature-Compensated Voltage

Reference

True and Complementary Reset Outputs

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

(low). As V approaches 3.5 V, the time-delay function activates, latching RESET and RESET active (high and

low, respectively) for a time delay (t ) after system voltages have achieved normal levels. Above V

= 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+

t_d

20 10³capacitance

where t is in seconds and capacitance is in farads.

Theovervoltage-detectioncircuitisprogrammableforawiderangeofdesigns. Duringanovervoltagecondition,

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...15

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与TL7770C相关器件

型号	品牌	获取价格	描述	数据表
TL7770I	TI	获取价格	DUAL POWER-SUPPLY SUPERVISORS
TL77-7F-10	DBLECTRO	获取价格	PCB PLUG-IN TRANSFORMER
TL77-7F-10D	DBLECTRO	获取价格	Power Transformer
TL77-7F-10S	DBLECTRO	获取价格	Power Transformer
TL77-7F-12	DBLECTRO	获取价格	PCB PLUG-IN TRANSFORMER
TL77-7F-120	DBLECTRO	获取价格	PCB PLUG-IN TRANSFORMER
TL77-7F-120S	DBLECTRO	获取价格	Power Transformer
TL77-7F-12D	DBLECTRO	获取价格	Power Transformer
TL77-7F-12S	DBLECTRO	获取价格	Power Transformer
TL77-7F-16	DBLECTRO	获取价格	PCB PLUG-IN TRANSFORMER

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