SN74LV221AQPWRQ1 datasheet(8/14 Pages) TI1

Part #	SN74LV221AQPWRQ1

Description	DUAL MONOSTABLE MULTIVIBRATOR WITH SCHMITT-TRIGGER INPUTS

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Manufacturer	TI1 [Texas Instruments]

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VCC

RT

CT

To Rext/Cext

Terminal

To Cext

Terminal

SN74LV221A-Q1

SCLS692A

– OCTOBER 2005 – REVISED APRIL 2008

www.ti.com

APPLICATION INFORMATION

Caution in Use

To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep the

wiring between the external components and Cext and Rext/Cext terminals as short as possible.

Power-Down Considerations

Large values of Cext can cause problems when powering down the SN74LV221A-Q1 because of the amount of

energy stored in the capacitor. When a system containing this device is powered down, the capacitor can

discharge from VCC through the protection diodes at pin 2 or pin 14. Current through the input protection diodes

must be limited to 30 mA; therefore, the turn-off time of the VCC power supply must not be faster than

t = VCC × Cext/30 mA. For example, if VCC = 5 V and Cext = 15 pF, the VCC supply must turn off no faster than

t = (5 V)

× (15 pF)/30 mA = 2.5 ns. Usually, this is not a problem because power supplies are heavily filtered and

cannot discharge at this rate. When a more rapid decrease of VCC to zero occurs, the SN74LV221A-Q1 can

sustain damage. To avoid this possibility, use external clamping diodes.

Output Pulse Duration

The output pulse duration, tw, is determined primarily by the values of the external capacitance (CT) and timing

resistance (RT). The timing components are connected as shown in Figure 2.

Figure 2. Timing-Component Connections

The pulse duration is given by:

tw = K × RT × CT

if CT is ≥ 1000 pF, K = 1.0

or

if CT is < 1000 pF, K can be determined from Figure 7

where:

tw = pulse duration in ns

RT = external timing resistance in kΩ

CT = external capacitancein pF

K = multiplier factor

(1)

Equation 1 and Figure 3 or Figure 4 can be used to determine values for pulse duration, external resistance, and

external capacitance.

8

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