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參數(shù)資料
| 型號： | SN54221W |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS |
| 中文描述： | 雙單穩(wěn)多諧振蕩器與施密特觸發(fā)輸入 |
| 文件頁數(shù)： | 7/23頁 |
| 文件大小： | 621K |
| 代理商： | SN54221W |
SDLS213B DECEMBER 1983 REVISED NOVEMBER 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics V
CC
= 5 V, R
L
= 400
,
T
A
= 25 C (see Figures 1 and 2)
PARAMETER
FROM
(INPUT)
TO
TEST CONDITIONS
SN54221
TYP
SN74221
TYP
UNIT
(OUTPUT)
MIN
MAX
MIN
MAX
tPLH
A
Q
45
70
45
70
B
Cext = 80 pF,
Rext = 2 k
35
55
35
55
ns
tPHL
A
Q
50
80
50
80
B
40
65
40
65
tPHL
tPLH
CLR
Q
Cext = 80 pF,
Rext = 2 k
27
27
ns
Q
40
40
Cext = 80 pF,
Cext = 0,
Cext = 100 pF,
Cext = 1
μ
F,
Rext = 2 k
Rext = 2 k
Rext = 10 k
Rext = 10 k
70
110
150
70
110
150
tw
A or B
Q or Q
17
30
50
17
30
50
ns
650
700
750
650
700
750
6.5*
7
7.5*
6.5
7
7.5
ms
On products compliant to MIL-PRF-38535, this parameter is not production tested.
recommended operating conditions (see Note 4)
SN54LS221
MIN
NOM
SN74LS221
MIN
NOM
UNIT
MAX
MAX
VCC
IOH
IOL
Supply voltage
4.5
5
5.5
4.75
5
5.25
V
μ
A
mA
High-level output current
400
400
Low-level output current
4
8
v/
t
Rise or fall of input pulse rate
B input
1*
1*
1
V/s
V/
μ
s
°
C
A input
1
TA
Operating free-air temperature
On products compliant to MIL-PRF-38535, this parameter is not production tested.
NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs
, literature number SCBA004.
55
125
0
70
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| SN74LS221 | 500mA, 8V,±2% Tolerance, Voltage Regulator, Ta = 0°C to +125°C; Package: DPAK 4 LEAD Single Gauge Surface Mount; No of Pins: 4; Container: Tape and Reel; Qty per Container: 2500 |
| SN74LS221D | 500mA, 8V,±4% Tolerance, Voltage Regulator, Ta = -40°C to +125°C; Package: DPAK 4 LEAD Single Gauge Surface Mount; No of Pins: 4; Container: Rail; Qty per Container: 75 |
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