TL7770-5

Name: TL7770-5
Brand: TI
SKU: TL7770-5
Price: 1.071 USD

現行

具有可編程延遲時間的 5-V 可編程雙電源供電監控器

立即訂購

產品規格表

document-pdfAcrobat Dual Power-Supply Supervisors datasheet (Rev. F) (英文)

TL7770-5

現行

產品規格表

立即訂購

產品詳細資料

Number of supplies monitored

2

Threshold voltage 1 (typ) (V)

4.55

Features

Complimentary output, Manual reset capable, Undervoltage and overvoltage monitor, Wide input voltage

Reset threshold accuracy (%)

2

Iq (typ) (mA)

5

Output driver type/reset output

Active-high, Active-low, Open-drain

Supply voltage (min) (V)

3.5

Supply voltage (max) (V)

18

Rating

Catalog

Watchdog timer WDI (s)

None

Operating temperature range (°C)

-40 to 85

Number of supplies monitored

2

Threshold voltage 1 (typ) (V)

4.55

Features

Complimentary output, Manual reset capable, Undervoltage and overvoltage monitor, Wide input voltage

Reset threshold accuracy (%)

2

Iq (typ) (mA)

5

Output driver type/reset output

Active-high, Active-low, Open-drain

Supply voltage (min) (V)

3.5

Supply voltage (max) (V)

18

Rating

Catalog

Watchdog timer WDI (s)

None

Operating temperature range (°C)

-40 to 85

PDIP (N)

16

181.42 mm² 19.3 x 9.4

SOIC (DW)

16

106.09 mm² 10.3 x 10.3

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

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

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 × 10³ × 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.

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 × 10³ × 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.

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