Datasheet
SN54HCT623, SN74HCT623
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS016C – MARCH 1984 – REVISED MARCH 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HCT623 SN74HCT623
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage V
CC
= 4.5 V to 5.5 V 2 2 V
V
IL
Low-level input voltage V
CC
= 4.5 V to 5.5 V 0.8 0.8 V
V
I
Input voltage 0 V
CC
0 V
CC
V
V
O
Output voltage 0 V
CC
0 V
CC
V
t
t
Input transition (rise and fall) time 500 500 ns
T
A
Operating free-air temperature –55 125 –40 85 °C
NOTE 3: All unused inputs of the device must be held at V
CC
or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
T
A
= 25°C SN54HCT623 SN74HCT623
UNIT
PARAMETER
TEST
CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
V
OH
V
I
=V
IH
or V
IL
I
OH
= –20 µA
45V
4.4 4.499 4.4 4.4
V
V
OH
V
I
=
V
IH
or
V
IL
I
OH
= –6 mA
4
.
5
V
3.98 4.3 3.7 3.84
V
V
OL
V
I
=V
IH
or V
IL
I
OL
= 20 µA
45V
0.001 0.1 0.1 0.1
V
V
OL
V
I
=
V
IH
or
V
IL
I
OL
= 6 mA
4
.
5
V
0.17 0.26 0.4 0.33
V
I
I
OEAB or
OEBA
V
I
= V
CC
or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
I
OZ
A or B V
O
= V
CC
or GND 5.5 V ±0.01 ±0.5 ±10 ±5 µA
I
CC
V
I
= V
CC
or 0, I
O
= 0 5.5 V 8 160 80 µA
∆I
CC
†
One input at 0.5 V or 2.4 V,
Other inputs at 0 or V
CC
5.5 V 1.4 2.4 3 2.9 mA
C
i
OEAB or
OEBA
4.5 V
to 5.5 V
3 10 10 10 pF
†
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
.
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
V
CC
T
A
= 25°C SN54HCT623 SN74HCT623
UNIT
PARAMETER
(INPUT) (OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
d
AorB
BorA
4.5 V 15 22 33 28
ns
t
pd
A
or
B
B
or
A
5.5 V 13 20 30 25
ns
t
OEBA
A
4.5 V 30 42 63 53
ns
t
en
OEBA
A
5.5 V 23 38 57 48
ns
t
di
OEBA
A
4.5 V 18 30 45 38
ns
t
dis
OEBA
A
5.5 V 16 28 42 35
ns
t
OEAB
B
4.5 V 30 42 63 53
ns
t
en
OEAB
B
5.5 V 23 38 57 48
ns
t
di
OEAB
B
4.5 V 18 30 45 38
ns
t
dis
OEAB
B
5.5 V 16 28 42 35
ns
t
t
AorB
4.5 V 9 12 18 15
ns
t
t
A
or
B
5.5 V 8 11 16 14
ns
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design phase of development. Characteristic data and other
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change or discontinue these products without notice.