74AHC244 Philips Semiconductors, 74AHC244 Datasheet - Page 2

• Manufacturer Part Number: 74AHC244
• Description: Octal buffer/line driver; 3-state
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
DESCRIPTION
The 74AHC/AHCT244 is a
high-speed Si-gate CMOS device.
The 74AHC/AHCT244 is an octal
non-inverting buffer/line driver with
3-state outputs.
The 3-state outputs are controlled by
the outputs enable inputs 1OE and
2OE.
A HIGH on nOE causes the outputs to
assume a high-impedance OFF state.
1999 Sep 28
ESD protection:
HBM EIA/JESD22-A114-A
exceeds 2000 V
MM EIA/JESD22-A115-A
exceeds 200 V
CDM EIA/JESD22-C101
exceeds 1000 V
Balanced propagation delays
All inputs have a Schmitt-trigger
action
Inputs accepts voltages higher than
V
For AHC only:
operates with CMOS input levels
For AHCT only:
operates with TTL input levels
Specified from
Octal buffer/line driver; 3-state
40 to +85 and +125 C.
CC
Notes
1. C
2. The condition is V
FUNCTION TABLE
See note 1.
Note
1. H = HIGH voltage level;
QUICK REFERENCE DATA
GND = 0 V; T
t
C
C
C
SYMBOL
PHL
I
O
PD
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF state.
P
f
f
C
V
i
o
/t
D
CC
PD
= input frequency in MHz;
L
PLH
= output frequency in MHz;
(C
= output load capacitance in pF;
= C
is used to determine the dynamic power dissipation (P
L
= supply voltage in Volts.
nOE
PD
V
H
L
L
propagation delay
1A
2A
input capacitance
output capacitance
power dissipation
capacitance
amb
CC
PARAMETER
n
n
V
2
to 1Y
to 2Y
CC
= 25 C; t
2
f
2
o
) = sum of outputs;
INPUTS
I
n
n
;
= GND to V
f
i
+
r
= t
(C
f
L
C
V
V
C
f = 1 MHz;
notes 1 and 2
3.0 ns.
CC
V
CC
I
CONDITIONS
L
L
= V
CC
= 15 pF;
= 50 pF;
nA
.
74AHC244; 74AHCT244
H
X
= 5 V
L
2
CC
n
f
or GND
o
) where:
3.5
3.5
4.0
10
AHC
Product specification
TYPICAL
OUTPUT
5.0
3.5
4.0
12
AHCT
D
nY
H
L
Z
in W).
n
ns
pF
pF
pF
UNIT