HD74LS174 查看數據表（PDF） - Renesas Electronics
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HD74LS174 Datasheet PDF : 9 Pages
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HD74LS174 / HD74LS175
Switching Characteristics
• HD74LS174
(VCC = 5 V, Ta = 25°C)
Item
Symbol Inputs Outputs min.
typ.
max.
Unit Condition
Maximum clock frequency
ƒmax
Clock
Q
30
40
—
MHz
Propagation delay time
tPHL
Clear
Q
tPLH
Clock
Q
—
23
35
CL = 15 pF,
—
20
30
ns
RL = 2 kΩ
tPHL
Clock
Q
—
21
30
• HD74LS175
(VCC = 5 V, Ta = 25°C)
Item
Symbol Inputs Outputs min.
typ.
max.
Unit Condition
Maximum clock frequency
ƒmax
Clock
Q, Q
30
40
—
MHz
Propagation delay time
tPLH
Clear
Q
tPHL
Q
—
16
25
—
20
30
CL = 15 pF,
ns
RL = 2 kΩ
tPLH
Clock
Q, Q
—
13
25
tPHL
Clock
Q, Q
—
16
25
Testing Method
Test Circuit
VCC
Out
In
P.G.
Zout = 50Ω
In
P.G.
Zout = 50Ω
Q
D
CK
CLR Q
Load circuit 1
RL
CL
Out
Same as Load Circuit 1.
Notes:
1. Test is put into the each flip-flop.
2. CL includes probe and jig capacitance.
3. All diodes are 1S2074(H).
Testing Table
Item
From input to output
ƒmax
CK→Q, Q*
tPLH
CK→Q, Q*
tPHL
CLR→Q, Q*
Note: *. HD74LS175 only
CLR
4.5 V
4.5 V
IN
Inputs
CK
IN
IN
IN
D
IN
IN
4.5 V
Outputs
Q
Q
OUT
OUT
Rev.3.00, Jul.15.2005, page 5 of 8
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