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SN74LS221DRE4 数据表(PDF) 8 Page - Texas Instruments

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部件名 SN74LS221DRE4
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

SN74LS221DRE4 数据表(HTML) 8 Page - Texas Instruments

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SN54221, SN54LS221, SN74221, SN74LS221
DUAL MONOSTABLE MULTIVIBRATORS
WITH SCHMITT TRIGGER INPUTS
SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS†
SN54LS221
SN74LS221
UNIT
PARAMETER
TEST CONDITIONS†
MIN
TYP‡
MAX
MIN
TYP‡
MAX
UNIT
VT+
Positive-going threshold voltage,
B input
VCC = MIN
1
2*
1
2
V
VT−
Negative-going threshold voltage,
B input
VCC = MIN
0.7*
0.9
0.8
0.9
V
VIK
VCC = MIN,
II = −18 mA
−1.5
−1.5
V
VOH
VCC = MIN,
IOH = −400 µA
2.5
3.4
2.7
3.4
V
VOL
VCC = MIN
IOL = 4 mA
0.25
0.4
0.25
0.4
V
VOL
VCC = MIN
IOL = 8 mA
0.35
0.5
V
II
VCC = MAX,
VI = 7 V
0.1
0.1
mA
IIH
VCC = MAX,
VI = 2.7 V
20
20
µA
IIL
A input
VCC = MAX,
VI = 0.4 V
−0.4
−0.4
mA
IIL
CLR, B input
VCC = MAX,
VI = 0.4 V
−0.8
−0.8
mA
IOS§
VCC = MAX
−20
−100
−20
−100
mA
ICC
Quiescent
VCC = MAX
4.7
11
4.7
11
mA
ICC
Triggered
VCC = MAX
19
27*
19
27
mA
∗ On products compliant to MIL-PRF-38535, this parameter is not production tested.
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
timing requirements over recommended ranges of supply voltage and operating free-air
temperature
SN54LS221
SN74LS221
UNIT
MIN
MAX
MIN
MAX
UNIT
tw
Pulse duration
A or B
50
50
ns
tw
Pulse duration
CLR
40
40
ns
tsu
Setup time, inactive state¶
CLR
15
15
ns
Rext
External timing resistance
1.4*
70*
1.4
100
k
Cext
External timing capacitance
0*
1000*
0
1000
µF
Output duty cycle
RT = 2 kΩ
50%
50%
Output duty cycle
RT = MAX Rext
90%
90%
∗ On products compliant to MIL-PRF-38535, this parameter is not production tested.
¶ Inactive-state setup time also is referred to as recovery time.


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