74LVC244 Philips Semiconductors, 74LVC244 Datasheet - Page 6

• Manufacturer Part Number: 74LVC244
• Description: Octal buffer/line driver with 5-volt tolerant inputs/outputs 3-Statetitle
• Manufacturer: Philips Semiconductors

1. Unless otherwise stated, all typical values are at V
Philips Semiconductors
AC CHARACTERISTICS
GND = 0V; t
NOTE:
AC WAVEFORMS
V
V
output load.
V
V
Waveform 1. Input (D
Waveform 2. 3-State enable and disable times.
1998 May 20
SYMBOL
M
OL
X
Y
Octal buffer/line driver with 5-volt
tolerant inputs/outputs (3-State)
Q
LOW-to-OFF
OFF-to-LOW
Q
HIGH-to-OFF
OFF-to-HIGH
= V
= V
nOE INPUT
INPUT
OUTPUT
= 1.5 V at V
t
t
t
t
t
t
n
n
PHL
PLH
PZH
PHZ
and V
PZL
PLZ
GND
V
V
GND
V
V
OUTPUT
OUTPUT
GND
V
V
OL
OH
OH
CC
OL
OH
OL
V
I
I
+ 0.3V at V
– 0.3V at V
OH
r
= t
are the typical output voltage drop that occur with the
CC
Propagation delay
1A
2A
3-State output enable time
1OE to 1Y
2OE to 2Y
3-State output disable time
1OE to 1Y
2OE to 2Y
f
v 2.5ns; C
n
n
w 2.7 V; V
V
to 1Y
to 2Y
outputs
enabled
V
M
CC
CC
t
M
PHL
PARAMETER
t
PLZ
n
t
PHZ
) to output (Qn) propagation delays.
n
n
n
n
n
n
;
2.7V; V
2.7V; V
;
;
L
M
= 50pF; R
V
= 0.5 V
M
V
X
Y
X
V
= V
= V
Y
OL
OH
CC
L
outputs
disabled
= 500 ; T
+ 0.1 V
– 0.1 V
at V
CC
t
t
PZL
PLH
t
CC
PZH
CC
WAVEFORM
< 2.7 V
amb
at V
at V
CC
1, 3
2, 3
2, 3
SY00041
= –40 C to +85 C.
V
CC
= 3.3V and T
CC
M
V
M
SW00207
< 2.7V
outputs
enabled
< 2.7V
MIN
amb
1.5
1.5
1.5
6
V
CC
= 25 C.
TEST CIRCUIT
= 3.3V 0.3V
TYP
DEFINITIONS
R
C
R
3.5
4.3
3.7
GENERATOR
SWITCH POSITION
t
t
t
PHZ
L
L
T
PLH
PLZ
TEST
PULSE
= Load resistor
= Load capacitance includes jig and probe capacitance
= Termination resistance should be equal to Z
1
Waveform 3. Load circuitry for switching times.
of pulse generators.
/t
/t
/t
PHL
PZL
PZH
MAX
5.9
7.6
5.8
Test Circuit for 3-State Outputs
SWITCH
2<V
Open
GND
V
IN
LIMITS
CC
R
MIN
1.5
1.5
1.5
T
V
CC
= 2.7V
D.U.T.
V
CC
MAX
6.9
8.6
6.8
2.7 – 3.6V
t 2.7V
V
V
OUT
CC
74LVCH244A
V
C
74LVC244A
L
CC
TYP
16.0
19.0
17.0
Product specification
= 1.2V
2.7V
V
V
CC
IN
OUT
S
1
R
R
L
L
=500
=500
2<V
GND
Open
SW00047
UNIT
ns
ns
ns
CC