Philips PM2521 Service Manual page 131

139
8.6.
LOW POWER SCHOTTKY
CIRCUITS
(LS)
LOW POWER SCHOTTKY
54LS/74LS
FAMILY CHARACTERISTICS
DC CHARACTERISTICS
OVER
OPERATING TEMPERATURES
Parameter
Test conditions
Limits
Unit
Min
1
Typ*
Max
V,i_i
Input
HIGH
voltage
1
H
Guaranteed input
HIGH
voltage for
all
inputs
2.0
V
V||^
Input
LOW
voltage
Guaranteed
input
LOW
voltage for inputs
Mil
0.7
V
Com
0.8
V
VcD
Input clamp diode voltage
=
Min.
I||^
=-18mA
-0.65
-1.5
V
V-, Output
LOW
voltage
UL
'^CC
'oL
~
0.25
0.4
V
=
Min.
Iq^ =
8.0mA
(Com. only)
0.35 0.5
V
V_u
Output
HIGH
voltage
Un
Vcc
= Min.
loH
=
-400/iA
Mil
2.5
3.4
V
Com
2.7
3.4
V
l-^j
Output
HIGH
current (open collector)
Un
Vcc
= Min.
Vqct
100 PA
I/-X- 71
J
Output
"off" current
HIGH
(3-state)
OZH
Vcc
= Max.
Vqct
= 2.4V
V^
=2.0V
20
PA
Iq
2
l
Output "off" current
LOW
(3-state)
VqY
=
2.0V
-20
PA
2
l|^ Input
HIGH
current Vcc
= Max. V|^
= 2.7V 20
PA
1
^
Input
HIGH
current at
Max
input voltage
Vcc=Max.V|^
=
10v3
0.1
mA
2
Input
LOW
current Vcc
=
Max.
V|^ =
0.4V
-0.4
mA
1
Qg
Output
short circuit
current Vcc
=
Max.
VccT
= 0V
-15
-100
mA
NOTES:
1.
Typical limits are at
2^C
and
v
qq=5.
0
V
2.
The
specified limits reflect
one
unit
load
for the family.
When more
than
one
load
is
connected
internally,
the limits
must be
multiplied
by
the
number
of connected
loads.
See
the
INPUT
AND
OUTPUT LOADING
AND
FAN-OUT TABLE
on
the data sheets
for the
guaranteed
limit for
each
input.
3.
The
following
LS
devices are limited to
a
5.5V
input
breakdown
voltage.
AH
inputs
of
the
LS181
;
dock
inputs
of LS90, LS92, LS93, LS196, LSI
97,
LS290, LS293, LS390,
LS393 and
LS490.