Ω
SCBS053B − MAY 1990 − REVISED APRIL 1994
•
•
•
•
•
SN54BCT25245 . . . JT OR W PACKAGE
SN74BCT25245 . . . DW OR NT PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
Designed to Facilitate Incident-Wave
Switching for Line Impedances of 25 Ω
or Greater
Distributed VCC and GND Pins Minimize
Noise Generated by the Simultaneous
Switching of Outputs
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)
A1
GND
A2
A3
GND
A4
A5
GND
A6
A7
GND
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
VCC
B3
B4
B5
B6
VCC
B7
B8
OE
SN54BCT25245 . . . FK PACKAGE
(TOP VIEW)
B4
B5
B6
NC
VCC
B7
B8
description
The ′BCT25245 is a 25-Ω octal bus transceiver
designed for asynchronous communication
between data buses. It improves both the
performance and density of 3-state memory
address drivers, clock drivers, and bus-oriented
transceivers.
4
5
3 2 1 28 27 26
25
VCC
B2
NC
B1
DIR
A1
6
24
7
23
8
22
9
21
10
20
19
11
12 13 14 15 16 17 18
OE
A8
GND
NC
A7
A6
GND
GND
A2
A3
NC
GND
A4
A5
The device allows data transmission from the A
bus to the B bus or from the B bus to the A bus
depending upon the logic level at the
direction-control (DIR) input. The output-enable
(OE) input can disable the device so that both
buses are effectively isolated.
B3
NC − No internal connection
These transceivers are capable of sinking 188-mA
IOL, which facilitates switching 25-Ω transmission
lines on the incident wave. The distributed VCC
and GND pins minimize switching noise for more
reliable system operation.
The SN54BCT25245 is characterized for operation over the full military temperature range of
−55°C to 125°C. The SN74BCT25245 is
characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
Copyright 1994, Texas Instruments Incorporated
!"#$% !%&% %'(#&% !"(($% & ' )"*+!&% &$, ("! !%'(# )$!'!&% )$( $ $(# ' $-& %("#$% &%&( .&((&%/,
("!% )(!$%0 $ % %$!$&(+/ %!+"$ $%0 ' &++
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• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
2−1
Ω
SCBS053B − MAY 1990 − REVISED APRIL 1994
logic symbol†
OE
DIR
A1
13
24
1
logic diagram (positive logic)
G3
DIR
24
3EN1[BA]
3EN2[AB]
13
23
1
B1
A1
OE
1
2
A2
A3
A4
A5
A6
A7
A8
3
22
4
20
6
19
7
18
9
17
10
15
12
14
B2
23
B3
B1
B4
B5
B6
To Seven Other Channels
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, NT, and W packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input voltage range, VI (see Note 1): Control inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 5.5 V
Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . . −0.5 V to 5.5 V
Voltage range applied to any output in the high state, VO (B port) . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC
Input clamp current, IIK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state, IO: SN54BCT25245 (A port) . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
SN54BCT25245 (B port) . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA
SN74BCT25245 (A port) . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
SN74BCT25245 (B port) . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
Operating free-air temperature range: SN54BCT25245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74BCT25245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
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 negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2−2
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
Ω
SCBS053B − MAY 1990 − REVISED APRIL 1994
recommended operating conditions
SN54BCT25245
SN74BCT25245
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
0.8
V
Input clamp current
−18
−18
mA
A port
−53
−80
IOH
High-level output current
B port
−3
−3
A port
125
188
IOL
Low-level output current
B port
20
24
TA
Operating free-air temperature
High-level input voltage
2
2
−55
125
V
V
0
70
mA
mA
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VCC = 4.5 V,
A port
B port
A port
MIN
II = −18 mA
IOH = − 53 mA
VCC = 4.5 V
VCC = 4.75 V,
VCC = 4.5 V,
−1.2
2.4
3.3
0.38
IIH‡
IIL‡
IOS§
VI = 5.5 V
0.3
VCC = 5.5 V,
VI = 2.7 V
Control input
VCC = 5.5 V,
VI = 0.5 V
B port only¶
VCC = 5.5 V,
VO = 0
A or B port
−60
A to B
ICCH
B to A
VCC = 5.5 V
A to B
ICCL
B to A
VCC = 5.5 V
ICCZ
Ci
Control input
VCC = 5.5 V
VCC = 5 V,
Cio
A port
B port
VO = 2.5 V or 0.5 V
V
0.5
0.25
0.25
0.1
0.1
70
70
20
20
−0.6
−0.6
−0.6
−0.6
−150
−60
−150
36
46
36
46
63
80
63
80
48
60
48
60
95
125
95
125
12
16
12
16
VI = 2.5 V or 0.5 V
VCC = 5 V,
0.55
0.5
0.35
A or B port
Control input
3.3
0.42
0.7
IOL = 20 mA
IOL = 24 mA
VCC = 5.5 V,
Control input
2.4
0.55
0.8
A or B port
II
V
V
2.7
IOL = 125 mA
IOL = 188 mA
VCC = 4.5 V
−1.2
UNIT
2
IOH = − 3 mA
IOL = 94 mA
VCC = 4.5 V
SN74BCT25245
TYP†
MAX
MIN
2
IOH = − 80 mA
IOH = − 3 mA
VOL
B port
SN54BCT25245
TYP†
MAX
TEST CONDITIONS
8
8
18
18
8
8
mA
µA
A
mA
mA
mA
mA
mA
pF
pF
† All typical values are at VCC = 5 V, TA = 25°C.
‡ For I/O ports, the parameters IIH and IIL include the off-state output current.
§ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
¶ Testing for this parameter on the A port is not recommended.
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$0% )&$ ' $1$+)#$%, &(&!$(! && &% $(
)$!'!&% &($ $0% 0&+, $-& %("#$% ($$(1$ $ (0 !&%0$ ( !%%"$ $$ )("! ." %!$,
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
2−3
Ω
SCBS053B − MAY 1990 − REVISED APRIL 1994
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C
′BCT25245
TO
(OUTPUT)
tPLH
tPHL
A
B
tPLH
tPHL
B
A
tPZH
tPZL
OE
A
tPHZ
tPLZ
OE
A
tPZH
tPZL
OE
B
tPHZ
tPLZ
OE
B
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†
SN54BCT25245 SN74BCT25245
MIN
TYP
MAX
MIN
MAX
MIN
MAX
1.2
3.3
5.1
1.2
5.8
1.2
5.7
1.9
4.3
6.7
1.9
7.6
1.9
7.2
1.2
3.3
4.8
1.2
5.7
1.2
5.5
2.1
4
5.6
2.1
6.4
2.1
6.2
3.7
6.3
8.4
3.7
10.1
3.7
9.6
4.5
7.4
9.2
4.5
11.1
4.5
10.3
1.8
3.7
5.5
1.8
6.4
1.8
6.2
3.3
5.1
7.2
3.3
9.6
3.3
8.3
3.4
5.7
7.9
3.4
9.2
3.4
8.9
4.3
6.6
8.7
4.3
10.1
4.3
9.7
2.7
4.5
6.3
2.7
7.2
2.7
6.9
1.7
4.5
6.8
1.7
8.3
1.7
7.5
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
%'(#&% !%!$(% )("! % $ '(#&1$ (
$0% )&$ ' $1$+)#$%, &(&!$(! && &% $(
)$!'!&% &($ $0% 0&+, $-& %("#$% ($$(1$ $ (0 !&%0$ ( !%%"$ $$ )("! ." %!$,
2−4
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
UNIT
ns
ns
ns
ns
ns
ns
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