Datasheet

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     
  
SDAS124C − APRIL 1982 − REVISED AUGUST 1996
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
T
A
= MIN to MAX
†
UNIT
(INPUT)
(OUTPUT)
SN54ALS258A SN74ALS258A
MIN MAX MIN MAX
t
PLH
A or B
Any Y
1 12 2 8
ns
t
PHL
A or B Any Y
2 9 2 7
ns
t
PLH
A/B
Any Y
4 28 5 25
ns
t
PHL
A/B
Any Y
5 25 6 20
ns
t
PZH
OE
Any Y
3 20 4 18
ns
t
PZL
OE
Any Y
5 21 5 18
ns
t
PHZ
OE
Any Y
2 12 2 10
ns
t
PLZ
OE
Any Y
3 37 4 18
ns
†
For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at T
A
= 55°C (in still air) (see Note 1): D package 1.3 W. . . . . . . . . . . . . . . . . . .
N package 1.1 W. . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN74AS257, SN74AS258 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
−65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
recommended operating conditions
SN74AS257
SN74AS258
UNIT
MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
I
OH
High-level output current −15 mA
I
OL
Low-level output current 48 mA
T
A
Operating free-air temperature 0 70 °C