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參數(shù)資料
| 型號： | 74C923 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 16, 20-Key Encoder |
| 中文描述： | 16，20鍵編碼器 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 218K |
| 代理商： | 74C923 |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Voltage at Any Pin
V
CC
b
0.3V to V
CC
a
0.3V
Operating Temperature Range
MM54C922, MM54C923
MM74C922, MM74C923
b
55
§
C to
a
125
§
C
b
40
§
C to
a
85
§
C
Storage Temperature Range
b
65
§
C to
a
150
§
C
Power Dissipation (P
D
)
Dual-In-Line
Small Outline
700 mW
500 mW
Operating V
CC
Range
V
CC
Lead Temperature
(Soldering, 10 seconds)
3V to 15V
18V
260
§
C
DC Electrical Characteristics
Min/Max limits apply across temperature range unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CMOS TO CMOS
V
T
a
Positive-Going Threshold Voltage
at Osc and KBM Inputs
V
CC
e
5V, I
IN
t
0.7 mA
V
CC
e
10V, I
IN
t
1.4 mA
V
CC
e
15V, I
IN
t
2.1 mA
V
CC
e
5V, I
IN
t
0.7 mA
V
CC
e
10V, I
IN
t
1.4 mA
V
CC
e
15V, I
IN
t
2.1 mA
V
CC
e
5V
V
CC
e
10V
V
CC
e
15V
V
CC
e
5V
V
CC
e
10V
V
CC
e
15V
V
CC
e
5V, V
IN
e
0.1 V
CC
V
CC
e
10V
V
CC
e
15V
V
CC
e
5V, I
O
e b
10
m
A
V
CC
e
10V, I
O
e b
10
m
A
V
CC
e
15V, I
O
e b
10
m
A
V
CC
e
5V, I
O
e
10
m
A
V
CC
e
10V, I
O
e
10
m
A
V
CC
e
15V, I
O
e
10
m
A
V
CC
e
5V, V
O
e
0.5V
V
CC
e
10V, V
O
e
1V
V
CC
e
15V, V
O
e
1.5V
V
CC
e
5V
V
CC
e
10V
V
CC
e
15V
V
CC
e
15V, V
IN
e
15V
3.0
6.0
9.0
3.6
6.8
10
4.3
8.6
12.9
V
V
V
V
T
b
Negative-Going Threshold Voltage
at Osc and KBM Inputs
0.7
1.4
2.1
1.4
3.2
5
2.0
4.0
6.0
V
V
V
V
IN(1)
Logical ‘‘1’’ Input Voltage,
Except Osc and KBM Inputs
3.5
8.0
12.5
4.5
9
13.5
V
V
V
V
IN(0)
Logical ‘‘0’’ Input Voltage,
Except Osc and KBM Inputs
0.5
1
1.5
1.5
2
2.5
V
V
V
I
rp
Row Pull-Up Current at Y1, Y2,
Y3, Y4 and Y5 Inputs
b
2
b
10
b
22
b
5
b
20
b
45
m
A
m
A
m
A
V
OUT(1)
Logical ‘‘1’’ Output Voltage
4.5
9
13.5
V
V
V
V
OUT(0)
Logical ‘‘0’’ Output Voltage
0.5
1
1.5
V
V
V
R
on
Column ‘‘ON’’ Resistance at
X1, X2, X3 and X4 Outputs
500
300
200
1400
700
500
X
X
X
I
CC
Supply Current
Osc at 0V, (one Y low)
0.55
1.1
1.7
1.1
1.9
2.6
mA
mA
mA
I
IN(1)
Logical ‘‘1’’ Input Current
at Output Enable
0.005
1.0
m
A
I
IN(0)
Logical ‘‘0’’ Input Current
at Output Enable
V
CC
e
15V, V
IN
e
0V
b
1.0
b
0.005
m
A
CMOS/LPTTL INTERFACE
V
IN(1)
Logical ‘‘1’’ Input Voltage,
Except Osc and KBM Inputs
54C, V
CC
e
4.5V
74C, V
CC
e
4.75V
54C, V
CC
e
4.5V
74C, V
CC
e
4.75V
54C, V
CC
e
4.5V
I
O
e b
360
m
A
74C, V
CC
e
4.75V
I
O
e b
360
m
A
54C, V
CC
e
4.5V
I
O
e b
360
m
A
74C, V
CC
e
4.75V
I
O
e b
360
m
A
V
CC
b
1.5
V
CC
b
1.5
V
V
V
IN(0)
Logical ‘‘0’’ Input Voltage,
Except Osc and KBM Inputs
0.8
0.8
V
V
V
OUT(1)
Logical ‘‘1’’ Output Voltage
2.4
V
2.4
V
V
OUT(0)
Logical ‘‘0’’ Output Voltage
0.4
V
0.4
V
Note 1:
‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. Except for ‘‘Operating Temperature Range’’
they are not meant to imply that the devices should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device
operation.
2
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