Datasheet > SN74LV221A-Q1

SN74LV221A-Q1

更新时间： 2024-02-22 07:23:15

品牌	Logo	应用领域
德州仪器 - TI		振荡器触发器输入元件
页数	文件大小	规格书
14页	197K
描述
DUAL MONOSTABLE MULTIVIBRATOR WITH SCHMITT-TRIGGER INPUTS

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SN74LV221A-Q1 数据手册

SN74LV221A-Q1

www.ti.com

SCLS692A –OCTOBER 2005–REVISED APRIL 2008

DUAL MONOSTABLE MULTIVIBRATOR

WITH SCHMITT-TRIGGER INPUTS

Check for Samples: SN74LV221A-Q1

FEATURES

•

Qualified for Automotive Applications

2-V to 5.5-V V_CCOperation

Supports Mixed-Mode Voltage Operation on

All Ports

Schmitt-Trigger Circuitry on A, B, and CLR

Inputs for Slow Transition Rates

Overriding Clear Terminates Output Pulse

Glitch-Free Power-Up Reset on Outputs

I_offSupports Partial-Power-Down Mode

Operation

PW PACKAGE

(TOP VIEW)

V_CC

1R_ext/C_ext

1C_ext

•

1CLR

•

12 2Q

2C_ext

2R_ext/C_ext

GND

2CLR

DESCRIPTION/ORDERING INFORMATION

The SN74LV221A is a dual multivibrator designed for 2-V to 5.5-V V_CCoperation. Each multivibrator has a

negative-transition-triggered (A) input and a positive-transition-triggered (B) input, either of which can be used as

an inhibit input.

This edge-triggered multivibrator features output pulse-duration control by three methods. In the first method, the

A input is low and the B input goes high. In the second method, the B input is high and the A input goes low. In

the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.

The output pulse duration is programmable by selecting external resistance and capacitance values. The

external timing capacitor must be connected between C_extand R_ext/C_ext(positive) and an external resistor

connected between R_ext/C_extand V_CC. To obtain variable pulse durations, connect an external variable resistor

between R_ext/C_extand V_CC. The output pulse duration also can be reduced by taking CLR low.

Pulse triggering occurs at a particular voltage level and is not related directly to the transition time of the input

pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition

rates with jitter-free triggering at the outputs.

Once triggered, the outputs are independent of further transitions of the A and B inputs and are a function of the

timing components, or the output pulses can be terminated by the overriding clear. Input pulses can be of any

duration relative to the output pulse. Output pulse duration can be varied by choosing the appropriate timing

components. Output rise and fall times are TTL compatible and independent of pulse duration. Typical triggering

and clearing sequences are illustrated in the input/output timing diagram.

The variance in output pulse duration from device to device typically is less than ±0.5% for given external timing

components. An example of this distribution for the SN74LV221A-Q1 is shown in Figure 8. Variations in output

pulse duration versus supply voltage and temperature are shown in Figure 5.

During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free,

without applying a reset pulse.

This device is fully specified for partial-power-down applications using I_off. The I_offcircuitry disables the outputs,

preventing damaging current backflow through the devices when they are powered down.

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.

UNLESS OTHERWISE NOTED this document contains

PRODUCTION DATA information 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.

12 3 4 5 6 7...14

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SN74LV221A-Q1 替代型号

型号	品牌	替代类型	描述	数据表
SN74LV221A	TI	功能相似	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS

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