74HC244 Philips, 74HC244 Datasheet - Page 6

• Manufacturer Part Number: 74HC244
• Description: Octal buffer/line driver 3-state
• Manufacturer: Philips

Philips Semiconductors
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
Output capability: bus driver
I
Note to HCT types
The value of additional quiescent supply current ( I
To determine I
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
December 1990
CC
INPUT
1A
2A
1OE
2OE
t
t
t
t
SYMBOL
PHL
PZH
PHZ
THL
Octal buffer/line driver; 3-state
n
n
category: MSI
/ t
/ t
/ t
/ t
TLH
PLH
PZL
PLZ
propagation delay
3-state output enable time
3-state output disable time
output transition time
r
1A
2A
1OE to 1Y
2OE to 2Y
1OE to 1Y
2OE to 2Y
= t
CC
UNIT LOAD COEFFICIENT
0.70
0.70
0.70
0.70
f
n
n
= 6 ns; C
to 1Y
to 2Y
per input, multiply this value by the unit load coefficient shown in the table below.
PARAMETER
n;
n
n;
n
n;
n
L
= 50 pF
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
min. typ. max. min. max. min. max.
13
15
15
5
25
CC
) for a unit load of 1 is given in the family specifications.
22
30
25
12
6
T
74HCT
amb
40 to 85
( C)
28
38
31
15
40 to 125
33
45
38
18
.
ns
ns
ns
ns
UNIT
74HC/HCT244
4.5
4.5
4.5
4.5
TEST CONDITIONS
V
(V)
Product specification
CC
Fig.5
Fig.6
Fig.6
Fig.5
WAVEFORMS