HD74LS248 Datasheet, PDF (5/7 Pages) Hitachi Semiconductor – BCD-to-Seven-Segment Decoders/Drivers(internal pull-up outputs)

HD74LS248
Testing Method
Test Circuit
4.5V
Input
P.G.
Zout = 50Ω
V_CC
a
A
b
B
c
C
D
d
LT
e
RBI
f
BI/RBO g
RL
Output
CL
Note: C_L includes probe and jig capacitance.
Testing Table
Item
t_on
t_off
RBI
4.5V
4.5V
4.5V
IN
D
GND
GND
GND
GND
Inputs
C
GND
GND
4.5V
GND
B
GND
4.5V
4.5V
GND
A
IN
IN
IN
GND
a
OUT
—
—
OUT
b
—
—
OUT
OUT
c
—
OUT
—
OUT
Outputs
d
OUT
—
OUT
OUT
e
OUT
OUT
OUT
OUT
f
OUT
—
OUT
OUT
g
—
—
OUT
—
Waveform
t_TLH
t_THL
90%
90%
3V
Input
1.3 V
1.3 V
10%
10%
0V
t_PLH
t_PHL
In phase output
1.3 V
t_PHL
1.3 V
t_PLH
V_OH
V_OL
Out of phase output
1.3 V
V_OH
1.3 V
V_OL
Note: Input pulse; t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz, duty cycle = 50%
Rev.3.00, Jul.15.2005, page 5 of 6