SN54LS170J データシートの表示（PDF） - Motorola => Freescale
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SN54LS170J Datasheet PDF : 4 Pages
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SN54 / 74LS170
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, Negative-
Going ER to Q Outputs
Propagation Delay, RA or RB
to Q Outputs
Propagation Delay, Negative-
Going EW to Q Outputs
Propagation Delay, Data Inputs
to Q Outputs
AC SETUP REQUIREMENTS (TA = 25°C)
Symbol
tW
ts
ts
th
th
tLATCH
Parameter
Pulse Width, ER, EW
Setup Time, Data to EW
Setup Time, WA, WB to EW
Hold Time, Data to EW
Hold Time, WA, WB to EW
Latch Time
Limits
Min Typ Max Unit
20
20
30
30
ns
25
24
40
40
ns
30
26
45
40
ns
30
22
45
35
ns
Test Conditions
Figure 1
Figure 2
Figure 1
VCC = 5.0 V
CL = 15 pF
RL = 2.0 kΩ
Figure 1
Limits
Min Typ Max Unit
25
ns
10
ns
15
ns
15
ns
5.0
ns
25
ns
Test Conditions
VCC = 5.0 V
RL = 2.0 kΩ
VOLTAGE WAVEFORMS
WRITE-SELECT
INPUT WA or WB
DATA INPUT
D1, D2, D3 or D4
WRITE-ENABLE
INPUT EW
READ-SELECT
INPUT RA or RB
READ-ENABLE
INPUT ER
OUTPUT
Q1, Q2, Q3 or Q4
3V
Vref
Vref
tsu(W)
th(W)
0V
3V
Vref
Vref
tw
tsu(D)th(D)
0V
3V
Vref Vref
0V
tlatch
3V
Vref
Vref
0V
tW
3V
Vref
Vref
0V
tPHL
tPLH
VOH
Vref
Vref
tPHL
VOL
tPLH
Figure 1
DATA INPUT
D1, D2, D3 or D4
WRITE-ENABLE
INPUT EW
OUTPUT
Q1, Q2, Q3 or Q4
Vref
tPLH
Vref
DATA INPUT
D1, D2, D3 or D4
WRITE-ENABLE
INPUT EW
OUTPUT
Q1, Q2, Q3 or Q4
Vref
tPHL
Vref
Figure 2
3V
0V
3V
Vref
tPHL
0V
VOH
Vref
VOL
3V
0V
3V
Vref
tPLH
0V
3V
Vref
0V
FAST AND LS TTL DATA
5-4
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