Datasheet
5
SN54HCT244
,
SN74HCT244
www.ti.com
SCLS175E –MONTH 2003–REVISED AUGUST 2016
Product Folder Links: SN54HCT244 SN74HCT244
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(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.4 Thermal Information
THERMAL METRIC
(1)
SN74HCT244
UNIT
DB
(SSOP)
DW
(SOIC)
N
(PDIP)
NS
(SO)
PW
(TSSOP)
20 PINS 20 PINS 20 PINS 20 PINS 20 PINS
R
θJA
Junction-to-ambient thermal resistance 89.4 76.6 44.8 71.8 97.4 °C/W
R
θJC(top)
Junction-to-case (top) thermal resistance 50.8 42.1 30.9 38.1 32.5 °C/W
R
θJB
Junction-to-board thermal resistance 44.5 44.5 25.7 39.2 49.3 °C/W
ψ
JT
Junction-to-top characterization parameter 16.9 15.9 16.3 14.9 1.7 °C/W
ψ
JB
Junction-to-board characterization parameter 44.1 44 25.6 38.8 47.7 °C/W
(1) This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or V
CC
.
6.5 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
V
OH
V
I
= V
IH
or V
IL
I
OH
= –20 µA
T
A
= 25°C
4.5 V
4.4 4.499
V
SN54HCT244 4.4
SN74HCT244 4.4
I
OH
= –6 mA
T
A
= 25°C 3.98 4.3
SN54HCT244 3.7
SN74HCT244 3.84
V
OL
V
I
= V
IH
or V
IL
I
OL
= 20 µA
T
A
= 25°C
4.5 V
0.001 0.1
V
SN54HCT244 0.1
SN74HCT244 0.1
I
OL
= 6 mA
T
A
= 25°C 0.17 0.26
SN54HCT244 0.4
SN74HCT244 0.33
I
I
V
I
= V
CC
or 0
T
A
= 25°C
5.5 V
±0.1 ±100
nASN54HCT244 ±1000
SN74HCT244 ±1000
I
OZ
V
O
= V
CC
or 0,
V
I
= V
IH
or V
IL
T
A
= 25°C
5.5 V
±0.01 ±0.5
µASN54HCT244 ±10
SN74HCT244 ±5
I
CC
V
I
= V
CC
or 0,
I
O
= 0
T
A
= 25°C
5.5 V
8
µASN54HCT244 160
SN74HCT244 80
∆I
CC
(1)
One input at 0.5 V
or 2.4 V,
Other inputs at 0 or
V
CC
T
A
= 25°C
5.5 V
1.4 2.4
mA
SN54HCT244 3
SN74HCT244 2.9
C
i
T
A
= 25°C
4.5 V to
5.5 V
3 10
pFSN54HCT244 10
SN74HCT244 10