English
Language : 

HD74LS93 Datasheet, PDF (6/9 Pages) Hitachi Semiconductor – 4-bit Binary Counters
◁
HD74LS93
Testing Table
From input
Inputs
Outputs
Item
to output
A
B
R0
QA
QB
QC
QD
fmax
A→Q
IN
to QA
GND
Out
B→Q
4.5 V
IN
GND
—
Out
Out
Out
Out
Out
Out
A → QA
IN
to QA
GND
Out
—
—
—
A → QD
IN
to QA
GND
—
—
—
Out
tPLH
B → QB
4.5 V
IN
GND
—
Out
—
—
tPHL
B → QC
4.5 V
IN
GND
—
—
Out
—
B → QD
4.5 V
IN
GND
—
—
—
Out
R0** → Q
IN*
to QA
IN
Out
Out
Out
Out
* For initialized.
** Measured with each input and unused inputs at 4.5 V.
Waveform
1. fmax, tPLH, tPHL (Clock → Q)
tTLH
tTHL
3V
Clock
90% 90%
10%
1.3 V 10%
1.3 V
0V
tPHL(Measure at tn+2) tPLH (Measure at tn+1)
QA
VOH
1.3 V
1.3 V
VOL
tPHL (Measure at tn+4) tPLH (Measure at tn+2)
VOH
QB
1.3 V
1.3 V
VOL
tPHL (Measure at tn+8) tPLH (Measure at tn+4)
VOH
QC
1.3 V
1.3 V
VOL
tPHL (Measure at tn+16) tPLH (Measure at tn+8)
Notes:
VOH
QD
1.3 V
1.3 V
VOL
1. Input pulse; tTLH ≤ 15 ns, tTHL ≤ 5 ns, PRR = 1 MHz, duty cycle = 50% and for fmax.,
tTLH = tTHL ≤ 2.5 ns
2. tn is reference bit time when all outputs are low.
Rev.2.00, Feb.18.2005, page 6 of 8
 ▷