Datasheet
SN54ACT16240, 74ACT16240
16-BIT BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS137C – JULY 1989 – REVISED NOVEMBER 1996
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
T
A
= 25°C SN54ACT16240 74ACT16240
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
PLH
A
Y
2.3 5 7.7 2 9.5 2.3 8.5
ns
t
PHL
A
Y
4.1 6.7 9.2 3 11.5 4.1 10.2
ns
t
PZH
OE
Y
2.6 5.6 8.5 2 10.1 2.6 9.4
ns
t
PZL
OE
Y
3.3 6.7 10.2 2.5 12.2 3.3 11.4
ns
t
PHZ
OE
Y
5.9 8.3 11 4.5 12.7 5.9 12
ns
t
PLZ
OE
Y
5.1 7.4 9.9 4 12 5.1 10.7
ns
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
d
Power dissi
p
ation ca
p
acitance
p
er driver
Outputs enabled
C
L
=50
p
F
f=1MHz
38
p
F
C
pd
Po
w
er
dissipation
capacitance
per
dri
v
er
Outputs disabled
C
L
=
50
pF
,
f
=
1
MH
z
9
pF
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
C
L
= 50 pF
(see Note A)
LOAD CIRCUIT
S1
2 × V
CC
500 Ω
500 Ω
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
Open
2 × V
CC
GND
t
PHL
t
PLH
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2 × V
CC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
V
OL
V
OH
t
PZL
t
PZH
t
PLZ
t
PHZ
1.5 V
1.5 V
1.5 V 1.5 V
V
CC
3 V
0 V
50% V
CC
50% V
CC
V
OH
V
OL
0 V
50% V
CC
20% V
CC
50% V
CC
80% V
CC
0 V
3 V
GND
Open
Input
Output
VOLTAGE WAVEFORMS VOLTAGE WAVEFORMS
TEST S1
NOTES: A. C
L
includes probe and jig capacitance.
B. 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.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z
O
= 50 Ω, t
r
= 3 ns, t
f
= 3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
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