HIT HD74HC174 Datasheet
HD74HC174
Hex D-type Flip-Flops (with Clear)
Description
This device contains 6 master-slave flip-flops with a common clock and common clear. Data on the D
input having the specified setup and hold times is transferred to the Q output on the low to high transition
of the clock input. The clear input when low, sets all outputs to a low state.
Features
• High Speed Operation: tpd (Clock to Q) = 15 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs Outputs
Clear Clock D Q
LX X L
H HH
H LL
H L X no change
H X no change
HD74HC174
Pin Arrangement
Clear
V
1
16
CC
Logic Diagram
Clock
1D
Clear
1Q
1D
2D
2Q
3D
3Q
GND
2
Q
CK CK
D
3
4
D
CK
Q
5
6
D
CK
Q
7
CLR
CLR
CLR
CLR
CK
CLR
CK
CLR
8
15
14
13
12
11
10
9
6Q
6D
5D
5Q
4D
4Q
Clock
Q
D
D
Q
D
Q
(Top view)
CK
Q
D
CL
1Q
2D
3D
4D
5D
6D
CK
Q
D
CL
CK
Q
D
CL
CK
Q
D
CL
CK
Q
D
CL
CK
Q
D
CL
2Q
3Q
4Q
5Q
6Q
2
HD74HC174
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –4 mA
6.0 5.68 — — 5.63 — IOH = –5.2 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 4 mA
6.0 — — 0.26 — 0.33 IOL = 5.2 mA
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
3
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