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| 型号： | SN54HC21FK |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | Up to 18V NiCd/NiMH Battery Fast Charge Controller with 177s Hold-off Time; Package: SOIC-8 Narrow Body; No of Pins: 8; Container: Tape and Reel; Qty per Container: 2500 |
| 中文描述： | 双4输入阳性与门 |
| 文件页数： | 2/5页 |
| 文件大小： | 77K |
| 代理商： | SN54HC21FK |
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic diagram (positive logic)
1A
1B
1C
1D
1Y
2A
2B
2C
2D
2Y
1
2
4
5
9
10
12
13
6
8
Pin numbers shown are for the D, J, N, and W packages.
absolute maximum ratings over operating free-air temperature range
Supply voltage range, V
CC
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) (see Note 1)
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) (see Note 1)
Continuous output current, I
O
(V
O
= 0 to V
CC
)
Continuous current through V
CC
or GND
Package thermal impedance,
θ
JA
(see Note 2): D package
–0.5 V to 7 V
±
20 mA
±
20 mA
±
25 mA
±
50 mA
127
°
C/W
78
°
C/W
–65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with EIA/JEDEC Std JESD51, except for through-hole packages,
which use a trace length of zero.
recommended operating conditions
SN54HC21
MIN
NOM
SN74HC21
MIN
NOM
UNIT
MAX
MAX
VCC
Supply voltage
2
5
6
2
5
6
V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
1.5
1.5
VIH
High-level input voltage
3.15
3.15
V
4.2
4.2
0
0.5
0
0.5
VIL
Low-level input voltage
0
1.35
0
1.35
V
0
1.8
0
1.8
VI
VO
Input voltage
0
VCC
VCC
1000
0
VCC
VCC
1000
V
Output voltage
0
0
V
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
0
0
tt
Input transition (rise and fall) time
0
500
0
500
ns
0
400
0
400
TA
Operating free-air temperature
–55
125
–40
85
°
C
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