HD74LS273 Datasheet, PDF (3/7 Pages) Hitachi Semiconductor – Octal D-type Positive-edge-triggered Flip-Flops(with Clear)

HD74LS273
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
V_IH
2.0
—
—
V
V_IL
—
—
0.8
V
Output voltage
V_OH
2.7
—
—
V
V_CC = 4.75 V, V_IH = 2 V, V_IL = 0.8 V,
I_OH = –400 µA
V_OL
—
—
0.5
V
I_OL = 8 mA V_CC = 4.75 V, V_IH = 2 V,
—
—
0.4
I_OL = 4 mA ^VIL ^{= 0.8 V}
I_IH
—
20
µA V_CC = 5.25 V, V_I = 2.7 V
Input current
I_IL
—
–0.4
mA V_CC = 5.25 V, V_I = 0.4 V
I_I
—
0.1
mA V_CC = 5.25 V, V_I = 7 V
Short-circuit output current
I_OS
–20
—
–100
mA V_CC = 5.25 V
Supply current
I_CC**
—
17
27
mA V_CC = 5.25 V
Input clamp voltage
V_IK
—
—
–1.5
V
V_CC = 4.75 V, I_IN = –18 mA
Notes: * V_CC = 5 V, Ta = 25°C
** With all outputs open and 4.5 V applied to all data and clear inputs, I_CC is measured after a momentary
ground, then 4.5 V is applied to clock.
Switching Characteristics
(V_CC = 5 V, Ta = 25°C)
Item
Symbol
Inputs min.
typ.
max.
Unit
Condition
Maximum clock frequency
ƒ_max
Clock
30
40
—
MHz
Propagation delay time
t_PHL
t_PLH
Clear
—
18
27
—
17
27
ns
C_L = 15 pF, R_L = 2 kΩ
Clock
t_PHL
—
18
27
Testing Method
Test Circuit
P.G.
Zout = 50Ω
Input 4.5V
P.G.
Zout = 50Ω
Input
V_CC
Output
RL
D
Q
Clock
Clear
CL
Notes: 1. C_L includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Rev.3.00, Jul.15.2005, page 3 of 6