HD74LS293 Datasheet, PDF (5/8 Pages) Hitachi Semiconductor – 4-bit Binary Counters

HD74LS293
Testing Method
Test Circuit
4.5V
P.G.
Zout = 50Ω
V_CC
QA
QA
A
B
QB
QB
QC
R0(1)
QC
R0(2)
QD
QD
RL ^{Load circuit 1}
CL
Same as Load Circuit 1.
Same as Load Circuit 1.
Same as Load Circuit 1.
Notes: 1. C_L includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Testing Table
Item From input to output
A
Inputs
B
R₀
ƒ_max
A→Q
B→Q
IN
4.5V
to Q_A
IN
GND
GND
A→Q_A
IN
to Q_A
GND
A→Q_D
IN
to Q_A
GND
t_PLH
B→Q_B
4.5V
IN
GND
t_PHL
B→Q_C
4.5V
IN
GND
B→Q_D
4.5V
IN
GND
R₀→Q**
IN*
to Q_A
IN
Notes: * For initialized.
** Measured with each input and unused inputs at 4.5 V.
Q_A
OUT
—
OUT
—
—
—
—
OUT
Outputs
Q_B
Q_C
OUT
OUT
OUT
OUT
—
—
—
—
OUT
—
—
OUT
—
—
OUT
OUT
Q_D
OUT
OUT
—
OUT
—
—
OUT
OUT
Rev.3.00, Jul.15.2005, page 5 of 7