HD74LS293P 查看數據表（PDF） - Renesas Electronics
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HD74LS293P Datasheet PDF : 8 Pages
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HD74LS293
Testing Method
Test Circuit
4.5V
P.G.
Zout = 50Ω
VCC
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. CL includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Testing Table
Item From input to output
A
Inputs
B
R0
ƒmax
A→Q
B→Q
IN
4.5V
to QA
IN
GND
GND
A→QA
IN
to QA
GND
A→QD
IN
to QA
GND
tPLH
B→QB
4.5V
IN
GND
tPHL
B→QC
4.5V
IN
GND
B→QD
4.5V
IN
GND
R0→Q**
IN*
to QA
IN
Notes: * For initialized.
** Measured with each input and unused inputs at 4.5 V.
QA
OUT
—
OUT
—
—
—
—
OUT
Outputs
QB
QC
OUT
OUT
OUT
OUT
—
—
—
—
OUT
—
—
OUT
—
—
OUT
OUT
QD
OUT
OUT
—
OUT
—
—
OUT
OUT
Rev.3.00, Jul.15.2005, page 5 of 7
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