Datasheet
SN54ABT640, SN74ABT640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS104C – FEBRUARY 1991 – REVISED JANUARY 1997
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A
= 25°C SN54ABT640 SN74ABT640
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP
†
MAX MIN MAX MIN MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.2 –1.2 –1.2 V
V
CC
= 4.5 V, I
OH
= –3 mA 2.5 2.5 2.5
V
OH
V
CC
= 5 V, I
OH
= –3 mA 3 3 3
V
V
OH
V
CC
=45V
I
OH
= –24 mA 2 2
V
V
CC
=
4
.
5
V
I
OH
= –32 mA 2* 2
V
OL
V
CC
=45V
I
OL
= 48 mA 0.55 0.55
V
V
OL
V
CC
=
4
.
5
V
I
OL
= 64 mA 0.55* 0.55
V
V
hys
100 mV
I
I
Control inputs
V
CC
=55V
V
I
=V
CC
or GND
±1 ±1 ±1
µA
I
I
A or B ports
V
CC
=
5
.
5
V
,
V
I
=
V
CC
or
GND
±100 ±100 ±100
µ
A
I
OZH
‡
V
CC
= 5.5 V, V
O
= 2.7 V 50 50 50 µA
I
OZL
‡
V
CC
= 5.5 V, V
O
= 0.5 V –50 –50 –50 µA
I
off
V
CC
= 0, V
I
or V
O
≤ 4.5 V ±100 ±100 µA
I
CEX
V
CC
= 5.5 V,
V
O
= 5.5 V
Outputs high 50 50 50 µA
I
O
§
V
CC
= 5.5 V, V
O
= 2.5 V –50 –100 –180 –50 –180 –50 –180 mA
V
CC
=
5.5 V,
Outputs high 5 250 250 250 µA
I
CC
A or B ports
V
CC
=
5
.
5
V
,
I
O
= 0,
Outputs low 24 30 30 30 mA
V
I
= V
CC
or GND
Outputs disabled 0.5 250 250 250 µA
¶
Data inp ts
V
CC
= 5.5 V,
One input at 3.4 V,
Outputs enabled 1.5 1.5 1.5
∆I
CC
¶
D
ata
i
nputs
,
Other inputs at
V
CC
or GND
Outputs disabled 0.05 0.05 0.05
mA
Control inputs
V
CC
= 5.5 V, One input at 3.4 V,
Other inputs at V
CC
or GND
1.5 1.5 1.5
C
i
Control inputs V
I
= 2.5 V or 0.5 V 4 pF
C
io
A or B ports V
O
= 2.5 V or 0.5 V 7 pF
* On products compliant to MIL-PRF-38535, this parameter does not apply.
†
All typical values are at V
CC
= 5 V.
‡
The parameters I
OZH
and I
OZL
include the input leakage current.
§
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
¶
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
SN54ABT640 SN74ABT640
UNIT
(INPUT)
(OUTPUT)
MIN TYP MAX MIN MAX MIN MAX
t
PLH
AorB
BorA
1 2.7 4.2 1 5 1 4.9
ns
t
PHL
A
or
B
B
or
A
1.5 2.7 4.3 1.5 5 1.5 4.9
ns
t
PZH
OE
AorB
1.5 3.7 4.9 1.5 5.9 1.5 5.8
ns
t
PZL
OE
A
or
B
1.3 5 5.9 1.3 7.4 1.3 7.3
ns
t
PHZ
OE
AorB
2.5 4.1 6.5 2.5 6.9 2.5 6.8
ns
t
PLZ
OE
A
or
B
2 3.3 5.3 2 5.6 2 5.5
ns
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