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参数资料
| 型号： | SN54HC21W |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | Up to 18V NiCd/NiMH Battery Fast Charge Controller with 177s Hold-off Time; Package: 8 LEAD PDIP; No of Pins: 8; Container: Rail; Qty per Container: 50 |
| 中文描述： | 双4输入阳性与门 |
| 文件页数： | 3/5页 |
| 文件大小： | 77K |
| 代理商： | SN54HC21W |
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
°
C
TYP
1.998
SN54HC21
MIN
1.9
SN74HC21
MIN
1.9
UNIT
MIN
1.9
MAX
MAX
MAX
2 V
IOH = –20
μ
A
4.5 V
4.4
4.499
4.4
4.4
VOH
VI = VIH or VIL
6 V
5.9
5.999
5.9
5.9
V
IOH = –4 mA
IOH = –5.2 mA
4.5 V
3.98
4.3
3.7
3.84
6 V
5.48
5.8
5.2
5.34
2 V
0.002
0.1
0.1
0.1
IOL = 20
μ
A
4.5 V
0.001
0.1
0.1
0.1
VOL
VI = VIH or VIL
6 V
0.001
0.1
0.1
0.1
V
IOL = 4 mA
IOL = 5.2 mA
4.5 V
0.17
0.26
0.4
0.33
6 V
0.15
±
0.1
0.26
±
100
0.4
0.33
±
1000
II
ICC
Ci
VI = VCC or 0
VI = VCC or 0,
6 V
±
1000
nA
μ
A
pF
IO = 0
6 V
2
40
20
2 V to 6 V
3
10
10
10
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
VCC
TA = 25
°
C
TYP
SN54HC21
MIN
SN74HC21
MIN
UNIT
(OUTPUT)
MIN
MAX
110
MAX
165
MAX
140
2 V
44
tpd
A, B, C, or D
Y
4.5 V
14
22
33
28
ns
6 V
11
19
28
24
2 V
29
75
110
95
tt
Y
4.5 V
6 V
10
8
15
13
22
19
19
16
ns
operating characteristics, T
A
= 25
°
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance per gate
No load
25
pF
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