SCAS027A − D2957, JULY 1987 − REVISED APRIL 1993
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Bidirectional Bus Transceivers in
High-Density 24-Pin Packages
Inputs Are TTL-Voltage Compatible
Flow-Through Architecture to Optimize
PCB Layout
Center-Pin VCC and GND Configurations to
Minimize High-Speed Switching Noise
EPICt (Enhanced-Performance Implanted
CMOS) 1-mm Process
500-mA Typical Latch-Up Immunity
at 125°C
Package Options Include Plastic SmallOutline Packages, Ceramic Chip Carriers,
and Standard Plastic and Ceramic 300-mil
DIPs
54ACT11640 . . . JT PACKAGE
74ACT11640 . . . DW OR NT PACKAGE
(TOP VIEW)
A1
A2
A3
A4
GND
GND
GND
GND
A5
A6
A7
A8
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
DIR
B1
B2
B3
B4
VCC
VCC
B5
B6
B7
B8
G
54ACT11640 . . . FK PACKAGE
(TOP VIEW)
description
B3
B4
V CC
NC
V CC
B5
B6
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. These devices transmit data from the
A bus to the B bus or from the B bus to the A bus
depending upon the level at the direction control
(DIR) input. The enable input G is used to disable
the device so the buses are effectively isolated.
B2
B1
DIR
NC
A1
A2
A3
4
3 2 1 28 27 26
25
6
24
7
23
8
22
9
21
10
20
11
19
12 13 14 15 16 17 18
B7
B8
G
NC
A8
A7
A6
A4
GND
GND
NC
GND
GND
A5
The 54ACT11640 is characterized for operation
over the full military temperature range of − 55°C
to 125°C. The 74ACT11640 is characterized for
operation from − 40°C to 85°C.
5
NC − No internal connection
FUNCTION TABLE
CONTROL
INPUTS
G
DIR
L
L
H
L
H
X
OPERATION
B data to A bus
A data to B bus
Isolation
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1993, Texas Instruments Incorporated
!"#$%! & '("")% $& ! *(+,'$%! -$%).
"!-('%& '!!"# %! &*)''$%!& *)" %/) %)"#& ! )0$& &%"(#)%&
&%$-$"- 1$""$%2. "!-('%! *"!')&&3 -!)& !% )')&&$",2 ',(-)
%)&%3 ! $,, *$"$#)%)"&.
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•
2−1
SCAS027A − D2957, JULY 1987 − REVISED APRIL 1993
logic symbol†
G
DIR
13
24
logic diagram (positive logic)
G
G3
3 EN1 [BA]
3 EN2 [AB]
A1
A2
A3
A4
A5
A6
A7
A8
1
2
DIR
23
1
2
22
3
21
4
20
9
17
10
16
11
15
12
14
B1
A1
B2
B1
B3
To Seven Other Transceivers
B4
B5
B6
B7
B8
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Pin numbers shown are for the DW, JT, and NT packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 6 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC + 0.5 V
Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 200 mA
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2−2
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•
SCAS027A − D2957, JULY 1987 − REVISED APRIL 1993
recommended operating conditions
54ACT11640
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
VCC
VIH
Supply voltage
VIL
VI
Low-level input voltage
Input voltage
0
VO
IOH
Output voltage
0
High-level output current
IOL
Dt /Dv
Low-level output current
TA
Operating free-air temperature
High-level input voltage
74ACT11640
2
2
V
V
0.8
Input transition rise or fall rate
UNIT
0.8
V
VCC
VCC
V
−24
−24
mA
24
24
mA
VCC
VCC
0
0
V
0
10
0
10
ns/ V
−55
125
− 40
85
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = − 50 mA
A
VOH
IOH = − 24 mA
IOH = − 50 mA†
IOH = − 75 mA†
IOZ
II
ICC
DICC§
G or DIR
74ACT11640
MIN
MIN
4.5 V
4.4
4.4
4.4
5.5 V
5.4
5.4
5.4
4.5 V
3.94
3.7
3.8
5.5 V
4.94
4.7
4.8
MAX
MAX
UNIT
V
3.85
5.5 V
3.85
4.5 V
IOL = 24 mA
A or B ports‡
54ACT11640
MIN
5.5 V
A
IOL = 50 mA
VOL
TA = 25°C
TYP
MAX
VCC
0.1
0.1
0.1
5.5 V
0.1
0.1
0.1
4.5 V
0.36
0.5
0.44
5.5 V
0.36
0.5
0.44
V
IOL = 50 mA†
IOL = 75 mA†
5.5 V
VO = VCC or GND
VI = VCC or GND
5.5 V
± 0.5
± 10
±5
mA
5.5 V
± 0.1
±1
±1
mA
VI = VCC or GND,
IO = 0
One input at 3.4 V,
Other inputs at GND or VCC
5.5 V
8
160
80
mA
5.5 V
0.9
1
1
mA
1.65
5.5 V
1.65
Ci
G or DIR
VI = VCC or GND
5V
4
Cio
A or B ports
VO = VCC or GND
5V
12
† Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
‡ For I/O ports, the parameter IOZ includes the input leakage.
§ 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 VCC.
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•
pF
pF
2−3
SCAS027A − D2957, JULY 1987 − REVISED APRIL 1993
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A or B
B or A
tPZH
tPZL
G
A or B
tPHZ
tPLZ
G
A or B
MIN
TA = 25°C
TYP
MAX
54ACT11640
MIN
74ACT11640
MAX
MIN
MAX
1.5
6.3
9.6
1.5
11
1.5
10.5
1.5
5.7
8.6
1.5
10
1.5
9.5
1.5
8.8
12.2
1.5
14.2
1.5
13.4
1.5
8.4
12.3
1.5
14.5
1.5
13.6
1.5
9.1
12.9
1.5
14.5
1.5
13.9
1.5
9.6
13.1
1.5
15
1.5
14.2
UNIT
ns
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Outputs enabled
Power dissipation capacitance per transceiver
Outputs disabled
CL = 50 pF,
TYP
45
f = 1 MHz
12
UNIT
pF
PARAMETER MEASUREMENT INFORMATION
2 × VCC
S1
500 Ω
From Output
Under Test
Open
GND
CL = 50 pF
(see Note A)
Output
Control
(low-level
enabling)
3V
1.5 V
0V
tPHL
Output
Waveform 2
S1 at GND
(see Note C)
VOH
50% VCC
3V
50% VCC
VOL
1.5 V
1.5 V
0V
tPZL
tPLZ
Output
Waveform 1
S1 at 2 × VCC
(see Note C)
1.5 V
tPLH
Output
S1
Open
2 × VCC
GND
500 Ω
LOAD CIRCUIT
Input
(see Note B)
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
50% VCC
20% VCC
VOL
tPHZ
tPZH
VOLTAGE WAVEFORMS
[ VCC
50% VCC
80% VCC
VOH
[0V
VOLTAGE WAVEFORMS
NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns.
C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
2−4
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