MC74F521 查看數據表（PDF） - Motorola => Freescale
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MC74F521 Datasheet PDF : 3 Pages
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MC54/74F521
LOGIC DIAGRAM
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
IA = B
OA = B
NOTE:
This diagram is provided only for the understanding
of logic operations and should not be used to estimate propagation delays.
LOGIC SYMBOL
1
IA = B B7
18
A7
17
B6
16
A6
15
B5
14
A5
13
B4
12
19
OA = B A4
B3
A3
11
9
8
B2
A2
7
6
B1
5
A1
4
B0
3
A0
2
VCC = PIN 20
GND = PIN 10
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
PARAMETER
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V Guaranteed Input HIGH Voltage
VIL
Input LOW Voltage
0.8
V Guaranteed Input LOW Voltage
VIK
Input Clamp Diode Voltage
–1.2
V
IIN = – 18 mA
VCC = MIN
VOH
Output HIGH Voltage
54, 74 2.5
3.4
V
IOH = – 1.0 mA
VCC = 4.5 V
74
2.7
3.4
V
IOH = – 1.0 mA
VCC = 4.75 V
VOL
Output LOW Voltage
0.35 0.5
V
IOL = 20 mA
VCC = MIN
20
µA VIN = 2.7 V
VCC = MAX
IIH
Input HIGH Current
100
µA VIN = 7.0 V
IIL
Input LOW Current
–0.6 mA VIN = 0.5 V
VCC = MAX
IOS
Output Short Circuit Current (Note 2)
– 60
–150 mA VOUT = 0 V
VCC = MAX
ICC
Power Supply Current
21
32
mA IA = B = GND
VCC = MAX
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
4-196
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