HD74LS174 Datasheet, PDF (5/9 Pages) Hitachi Semiconductor – Hex/Quadruple D-type Flip-Flips(with clear)

HD74LS174 / HD74LS175
Switching Characteristics
• HD74LS174
(V_CC = 5 V, Ta = 25°C)
Item
Symbol Inputs Outputs min.
typ.
max.
Unit Condition
Maximum clock frequency
ƒ_max
Clock
Q
30
40
—
MHz
Propagation delay time
t_PHL
Clear
Q
t_PLH
Clock
Q
—
23
35
C_L = 15 pF,
—
20
30
ns
R_L = 2 kΩ
t_PHL
Clock
Q
—
21
30
• HD74LS175
(V_CC = 5 V, Ta = 25°C)
Item
Symbol Inputs Outputs min.
typ.
max.
Unit Condition
Maximum clock frequency
ƒ_max
Clock
Q, Q
30
40
—
MHz
Propagation delay time
t_PLH
Clear
Q
t_PHL
Q
—
16
25
—
20
30
C_L = 15 pF,
ns
R_L = 2 kΩ
t_PLH
Clock
Q, Q
—
13
25
t_PHL
Clock
Q, Q
—
16
25
Testing Method
Test Circuit
V_CC
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. C_L includes probe and jig capacitance.
3. All diodes are 1S2074(H).
Testing Table
Item
From input to output
ƒ_max
CK→Q, Q*
t_PLH
CK→Q, Q*
t_PHL
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