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SN74LS221DBRG4 数据表(PDF) 11 Page - Texas Instruments

部件名 SN74LS221DBRG4
功能描述  DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUT
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74LS221DBRG4 数据表(HTML) 11 Page - Texas Instruments

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SN54221, SN54LS221, SN74221, SN74LS221
DUAL MONOSTABLE MULTIVIBRATORS
WITH SCHMITT TRIGGER INPUTS
SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
B†
CLR
Q
3 V
3 V
0 V
0 V
VOH
VOL
≥ 50 ns
CONDITION 4: TRIGGERING FROM POSITIVE TRANSITION OF CLR
≥ 50 ns
A‡
CLR
Q
Q
3 V
3 V
0 V
0 V
VOH
VOH
VOL
VOL
tw
≥ 60 ns
tPLH
tPHL
tPHL
tPLH
CONDITION 5: TRIGGER FROM A, THEN CLR
A‡
Q
Q
3 V
0 V
VOH
VOH
VOL
VOL
tw
CONDITION 6: TRIGGER FROM A
tw
† A is low.
‡ B and CLR are high.
NOTES: A. Input pulses are supplied by generators having the following characteristics: PRR
≤ 1 MHz, ZO ≈ 50Ω; for SN54/74221, tr ≤ 7 ns,
tf ≤ 7 ns, for SN54/74LS221, tr ≤ 15 ns, tf ≤ 6 ns.
B. All measurements are made between the 1.5-V points of the indicated transitions for the SN54/74221 or between the 1.3-V points
for the SN54/74LS221.
Figure 1. Switching Characteristics (Continued)


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