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參數資料
| 型號： | TL7770-5IN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL POWER-SUPPLY SUPERVISORS |
| 中文描述： | 雙電源監事 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 128K |
| 代理商： | TL7770-5IN |
TL7770-5, TL7770-12
DUAL POWER-SUPPLY SUPERVISORS
SLVS019F – OCTOBER 1987 – REVISED JULY 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Power-On Reset Generator
Automatic Reset Generation After Voltage
Drop
RESET Defined When V
CC
Exceeds 1 V
Wide Supply-Voltage Range . . . 3.5 V
to 18 V
Precision Overvoltage and Undervoltage
Sensing
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
CC
attains the minimum voltage of 1 V during power up, the RESET output becomes active
(low). As V
CC
approaches 3.5 V, the time-delay function activates, latching RESET and RESET active (high and
low, respectively) for a time delay (t
d
) after system voltages have achieved normal levels. Above V
CC
= 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
IT+
, for a time delay, which is determined by an external timing capacitor such that:
t
d
20
10
3
capacitance
where t
d
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.
Copyright
1999, 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.
DW OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1RESIN
1CT
1RESET
1RESET
1VSU
1VSO
1SCR DRIVE
GND
V
CC
2RESIN
2CT
2RESET
2RESET
2VSU
2VSO
2SCR DRIVE
相關PDF資料 |
PDF描述 |
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| TL7770-5N | DUAL POWER-SUPPLY SUPERVISORS |
| TL7770-5Y | DUAL POWER-SUPPLY SUPERVISORS |
| TL7770-5DW | DUAL POWER-SUPPLY SUPERVISORS |
| TL780KTE | POSITIVE-VOLTAGE REGULATORS |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TL7770-5MFKB | 制造商:Texas Instruments 功能描述: |
| TL7770-5MJB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL POWER-SUPPLY SUPERVISORS |
| TL7770-5N | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL POWER-SUPPLY SUPERVISORS |
| TL7770-5QDW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL POWER-SUPPLY SUPERVISORS |
| TL7770-5QDWR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL POWER-SUPPLY SUPERVISORS |
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