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參數資料
| 型號： | MC74F399 |
| 廠商： | Motorola, Inc. |
| 英文描述： | QUAD 2-PORT REGISTER FAST SCHOTTKY TTL |
| 中文描述： | 四2端口登記快中子肖特基TTL |
| 文件頁數： | 2/3頁 |
| 文件大小： | 78K |
| 代理商： | MC74F399 |
4-193
FAST AND LS TTL DATA
MC54/74F399
FUNCTIONAL DESCRIPTION
The MC54/74F398 is a high-speed quad 2-port register. It
will select four bits of data from either of two sources (Ports)
under control of a common Select input (S). The selected data
is transferred to a 4-bit output register synchronous with the
LOW-to-HIGH transition of the Clock input (CP). The 4-bit D-
type output register is fully edge-triggered. The Data inputs
(I0x, I1x) and Select input (S) must be stable only a setup time
prior to and hold time after the LOW-to-HIGH transition of the
Clock input for predictable operation.
Inputs
Output
S
I0
I1
X
Q
I
I
h
h
I
h
X
X
X
I
h
L
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition
I = LOW Voltage Level one setup time prior to the LOW-to-HIGH clock transition
X = Don’t Care
FUNCTION TABLE
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54, 74
4.5
5.0
5.5
V
TA
Operating Ambient Temperature Range
54
–55
25
125
°
C
74
0
25
70
IOH
Output Current
High
54, 74
– 1.0
mA
IOL
Output Current
Low
54, 74
20
mA
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
IIH
Input HIGH Current
20
μ
A
VIN = 2.7 V
VCC = MAX
100
μ
A
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
22
34
mA
VCC = MAX
VIN = GND
CP =
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.
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