74HC244; 74HCT244
Octal buffer/line driver; 3-state
Rev. 03 — 22 December 2005
Product data sheet
1. General description
The 74HC244; 74HCT244 is a high-speed Si-gate CMOS device and is pin compatible
with Low-power Schottky TTL (LSTTL).
The 74HC244; 74HCT244 has octal non-inverting buffer/line drivers with 3-state outputs.
The 3-state outputs are controlled by the output enable inputs 1OE and 2OE. A HIGH on
nOE causes the outputs to assume a high-impedance OFF-state. The 74HC244;
74HCT244 is identical to the 74HC240; 74HCT240 but has non-inverting outputs.
2. Features
s
s
s
s
Octal bus interface
Non-inverting 3-state outputs
Complies with JEDEC standard no. 7A
ESD protection:
x
HBM EIA/JESD22-A114-C exceeds 2000 V
x
MM EIA/JESD22-A115-A exceeds 200 V
s
Multiple package options
s
Specified from
−40 °C
to +85
°C
and from
−40 °C
to +125
°C
3. Quick reference data
Table 1:
Quick reference data
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Symbol Parameter
74HC244
t
PHL
,
t
PLH
C
i
C
PD
propagation delay
nAn to nYn
input capacitance
power dissipation
capacitance
propagation delay
nAn to nYn
input capacitance
power dissipation
capacitance
per buffer; V
I
= GND to
(V
CC
−
1.5 V)
Conditions
V
CC
= 5 V; C
L
= 15 pF
Min
-
-
Typ
9
3.5
35
Max
-
-
-
Unit
ns
pF
pF
per buffer; V
I
= GND to
V
CC
V
CC
= 5 V; C
L
= 15 pF
-
74HCT244
t
PHL
,
t
PLH
C
i
C
PD
[1]
-
-
-
11
3.5
35
-
-
-
ns
pF
pF
C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
×
N +
∑(C
L
×
V
CC2
×
f
o
) where:
PHILIPS [ NXP SEMICONDUCTORS ]
