TI SN64BCT25245

SN64BCT25245
25-Ω OCTAL BUS TRANSCEIVER
SCBS060A – JUNE 1990 – REVISED DECEMBER 1993
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DW OR NT PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
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
Data Flow-Through Pinout (All Inputs
on Opposite Side From Outputs)
High-Impedance State During Power Up
and Power Down
ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (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
description
The SN64BCT25245 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.
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.
This transceiver is 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 outputs are in a high-impedance state during power up and power down while the supply voltage is less
than approximately 3 V.
The SN64BCT25245 is characterized for operation from – 40°C to 85°C and 0°C to 70°C.
FUNCTION TABLE
INPUTS
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
Copyright  1993, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3–1
SN64BCT25245
25-Ω OCTAL BUS TRANSCEIVER
SCBS060A – JUNE 1990 – REVISED DECEMBER 1993
logic symbol†
OE
DIR
A1
13
24
logic diagram (positive logic)
G3
DIR
24
3EN1[BA]
3EN2[AB]
1
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.
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 7 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: A port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°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.
recommended operating conditions
MIN
NOM
MAX
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
V
Input clamp current
–18
mA
IOH
High level output current
High-level
IOL
Low level output current
Low-level
TA
Operating free-air temperature
3–2
High-level input voltage
2
POST OFFICE BOX 655303
V
A port
– 80
B port
–3
A port
188
B port
24
– 40
• DALLAS, TEXAS 75265
V
85
mA
mA
°C
SN64BCT25245
25-Ω OCTAL BUS TRANSCEIVER
SCBS060A – JUNE 1990 – REVISED DECEMBER 1993
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
TEST CONDITIONS
II = –18 mA
IOH = – 3 mA
2.7
B port
VCC = 4.5 V,
VCC = 4.5 V,
IOH = – 80 mA
IOH = – 3 mA
2.4
A port
VCC = 4
4.5
5V
IOL = 94 mA
IOL = 188 mA
0.42
B port
VCC = 4.5 V,
IOL = 24 mA
VO = 2.7 V
0.35
A port
IOZ
VCC = 1
1.8
8 V to 0 (power down)
IIH‡
IIL‡
IOS§
ICCL
ICCH
ICCZ
Ci
Cio
TYP†
VCC = 4.5 V,
VCC = 4.75 V,
VCC = 0 to 2
2.3
3 V (power up)
II
MIN
A and B ports
DIR and OE
A and B ports
DIR and OE
A and B ports
DIR and OE
B port¶
A to B port
B to A port
A to B port
B to A port
OE and DIR
A port
B port
VO = 0.5 V
VO = 2.7 V
VO = 0.5 V
VCC = 0 to 5.5
5 5 V,
V
VI = 5
5.5
5V
5V
VCC = 5
5.5
V,
7V
VI = 2
2.7
VCC = 5
5.5
5V
V,
VI = 0
0.5
5V
VCC = 5.5 V,
VO = 0
V
V
3.3
0.55
0.7
OE at 0.8
08V
OE at 0.8
08V
70
µA
– 0.6
mA
70
µA
– 0.6
mA
0.1
70
20
– 60
VI = 2.5 V to 0.5 V
VI = 2
2.5
5 V to 0
0.5
5V
µA
mA
– 150
mA
60
95
125
36
46
63
80
12
16
8
mA
– 0.6
06
48
18
V
0.5
0.25
VCC = 5
5.5
5V
VCC = 5
5.5
5V
V,
UNIT
– 1.2
2
VCC = 5
5.5
5V
VCC = 5.5 V
VCC = 5.5 V,
MAX
mA
mA
mA
pF
pF
F
8
† All typical values are at VCC = 5 V, TA = 25°C.
‡ For I/O ports, the parameters IIH and IIL include the off-state outputs 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3–3
SN64BCT25245
25-Ω OCTAL BUS TRANSCEIVER
SCBS060A – JUNE 1990 – REVISED DECEMBER 1993
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
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
POST OFFICE BOX 655303
TA = – 40°C
to 85°C
UNIT
TA = 0°C
to 70°C
MIN
TYP
MAX
MIN
MAX
MIN
MAX
1.2
3.3
5.1
1.2
5.7
1.2
5.7
1.9
4.3
6.7
1.9
7.3
1.9
7.2
1.2
3.3
4.8
1.2
5.5
1.2
5.5
2.1
4
5.6
2.1
6.3
2.1
6.2
3.7
6.3
8.4
3.7
9.7
3.7
9.6
4.5
7.4
9.2
4.5
10.6
4.5
10.3
1.8
3.7
5.5
1.8
6.2
1.8
6.2
3.3
5.1
7.2
3.3
8.8
3.3
8.3
3.4
5.7
7.9
3.4
8.9
3.4
8.9
4.3
6.6
8.7
4.3
9.9
4.3
9.7
2.7
4.5
6.3
2.7
6.9
2.7
6.9
1.7
4.5
6.8
1.7
7.7
1.7
7.5
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
3–4
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω
VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω
Ω,
TA = 25°C
• DALLAS, TEXAS 75265
ns
ns
ns
ns
ns
ns
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