Datasheet

t
PHZ
t
PLZ
t
PZL
t
PZH
3 V
0 V
Output
Control
(low-level
enabling)
Waveform 1
(see Notes C
and D)
Waveform 2
(see Notes C
and D)
1.5 V
V
OH
0.3 V
V
OL
+ 0.3 V
1.5 V
1.3 V 1.3 V
1.3 V
1.3 V
V
OL
V
OH
t
t
PZH
1.5 V
V
V
OL
t
PHL
t
PLH
t
PLH
t
PHL
Input
Out-of-Phase
Output
(see Note D)
3 V
0 V
V
OL
V
OH
V
OH
V
OL
In-Phase
Output
(see Note D)
1.3 V 1.3 V
1.3 V 1.3 V
1.3 V 1.3 V
3 V
3 V
0 V
0 V
t
t
h
su
Timing
Input
Data
Input
1.3 V
1.3 V 1.3 V
8
SN54LS240
,
SN54LS241
,
SN54LS244
,
SN54S240
,
SN54S241
,
SN54S244
SN74LS240
,
SN74LS241
,
SN74LS244
,
SN74S240
,
SN74S241
,
SN74S244
SDLS144D APRIL 1985REVISED OCTOBER 2016
www.ti.com
Product Folder Links: SN54LS240 SN54LS241 SN54LS244 SN54S240 SN54S241 SN54S244 SN74LS240
SN74LS241 SN74LS244 SN74S240 SN74S241 SN74S244
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Figure 6. Voltage Waveforms,
Setup and Hold Times
Figure 7. Voltage Waveforms,
Propagation Delay Times
A. C
L
includes probe and jig capacitance.
B. All diodes are 1N3064 or equivalent.
C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output
control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the
output control.
D. S1 and S2 are closed for t
PLH
, t
PHL
, t
PHZ
, and t
PLZ
; S1 is open and S2 is closed for t
PZH
; S1 is closed and S2 is open
for t
PZL
.
E. Phase relationships between inputs and outputs have been chosen arbitrarily for these examples.
F. All input pulses are supplied by generators having the following characteristics: PRR 1 MHz, Z
O
is approximately
50 Ω, t
r
15 ns, t
f
6 ns.
G. The outputs are measured one at a time with one input transition per measurement.
Figure 8. Voltage Waveforms,
Enable and Disable Times, 3-State Outputs