HD74LS74A Datasheet, PDF (3/8 Pages) Hitachi Semiconductor – Dual D-type Positive Edge-triggered Flip-Flops(With Preset and Clear)

HD74LS74A
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
Output voltage
D
VIH
2.0
—
—
V
VIL
—
—
0.8
V
VOH
2.7
—
—
V
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V,
IOH = –400 µA
VOL
—
—
0.5
V
IOL = 8 mA V_CC = 4.75 V, V_IL = 0.8 V,
—
—
0.4
IOL = 4 mA VIH = 2 V
—
—
20
Clear
—
—
40
Preset
IIH
—
—
40
µA VCC = 5.25 V, VI = 2.7 V
Clock
—
—
20
D
—
—
–0.4
Input
Clear
—
—
–0.8
current Preset
IIL
—
—
–0.8
mA VCC = 5.25 V, VI = 0.4 V
Clock
—
—
–0.4
D
—
—
0.1
Clear
—
—
0.2
Preset
II
—
—
0.2
mA VCC = 5.25 V, VI = 7 V
Clock
—
—
0.1
Short-circuit output
current
IOS
–20
—
–100
mA VCC = 5.25 V
Supply current
ICC**
—
4
8
mA VCC = 5.25 V
Input clamp voltage
VIR
—
—
–1.5
V
VCC = 4.75 V, IIN = –18 mA
Notes: * VCC = 5 V, Ta = 25°C
** With all output open, ICC is measured with the Q and Q outputs high in turn. At the time of measurement, the
clock input is grounded.
Switching Characteristics
(V_CC = 5 V, Ta = 25°C)
Item
Symbol
Inputs
Outputs min. typ. max. Unit
Condition
Maximum clock frequency
fmax
25
33
MHz
Propagation delay time
tPLH
Clear, Clock Q, Q
tPHL
or Preset
—
—
13
25
25
40
ns
CL = 15 pF,
RL = 2 kΩ
ns
Timing Definition
t_w
Clock
Data
1.3 V
t_su
1.3 V
t_h
1.3 V
t_su
t_h
1.3 V
"H" Data
1.3 V
"L" Data
3V
0V
3V
1.3 V
0V
Rev.3.00, Jul.22.2005, page 3 of 7