SN64BCT245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS040A – JANUARY 1990 – REVISED JANUAR Y 1994
Copyright 1994, Texas Instruments Incorporated
3–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• BiCMOS Design Significantly Reduces I
CCZ
• 3-State True Outputs Drive Bus Lines
Directly
• 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 (N)
description
This octal bus transceiver is designed for
asynchronous communication between data
buses. The devices transmit data 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 be used to disable the device
so the buses are effectively isolated.
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 SN64BCT245 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
logic symbol
†
logic diagram (positive logic)
A5
6
A6
7
A7
8
A8
9
A2
3
A3
4
A4
5
OE
A1
2
G3
19
3EN2[AB]
B5
14
B6
13
B7
12
B8
11
B1
18
B2
17
B3
16
B4
15
3EN1[BA]
1
DIR
DIR
OE
A1
B1
1
2
18
19
To Seven Other Channels
1
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
DW OR N PACKAGE
(TOP VIEW)
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.
SN64BCT245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS040A – JANUARY 1990 – REVISED JANUAR Y 1994
3–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
– 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) – 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state, V
O
– 0.5 V to 5.5 V. . . . . . . . . . . . . . .
Voltage range applied to any output in the high state, V
O
– 0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state 128 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 voltage ratings may be exceeded if the input and output current ratings are observed.
recommended operating conditions
MIN NOM MAX UNIT
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
I
IK
Input clamp current –18 mA
p
A1–A8 –3
IOHHigh-level output current
B1–B8 –15
mA
p
A1–A8 24
IOLLow-level output current
B1–B8 64
mA
T
A
Operating free-air temperature –40 85 °C
SN64BCT245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS040A – JANUARY 1990 – REVISED JANUAR Y 1994
3–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
VCC = 4.5 V, II = –18 mA –1.2 V
Any A IOH = –1 mA 2.5 3.4
V
OH
Any A or B
VCC = 4.5 V
IOH = –3 mA 2.4 3.3
V
Any B IOH = –15 mA 2 3.1
Any A
IOL = 24 mA 0.35 0.5
V
OL
Any B
V
CC
= 4.5
V
IOL = 64 mA 0.42 0.55
V
p
VO = 2.7 V
70 µA
Power up
V
CC
= 0 to 2.3
V
VO = 0.5 V
OE at 0.8 V
–0.65 mA
I
OZ
VO = 2.7 V
70 µA
Power down
V
CC
= 1.8 V to
0
VO = 0.5 V
OE at 0.8 V
–0.65 mA
A and B
1
I
I
‡
DIR and OE
V
CC
= 5.5 V,
V
I
= 5.5
V
0.1
mA
A and B
70
I
IH
‡
DIR and OE
V
CC
= 5.5 V,
V
I
= 2.7
V
20
µ
A
A and B
–0.65
I
IL
DIR and OE
V
CC
=
5.5 V
,
V
I
=
0.5 V
–1.2
mA
Any A
–60 –150
I
OS
§
Any B
V
CC
= 5.5 V,
V
O
=
0
–100 –225
mA
I
CCH
A-to-B VCC = 5.5 V 36 57
I
CCL
A-to-B VCC = 5.5 V 57 90
mA
I
CCZ
VCC = 5.5 V 10 15
C
i
OE and DIR VCC = 5 V, VI = 2.5 V or 0.5 V 7 pF
A to B
9
p
C
io
B to A
V
CC
= 5 V,
V
I
= 2.5 V or 0.5
V
12
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.
switching characteristics (see Note 2)
FROM
TO
VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω
PARAMETER
(INPUT) (OUTPUT)
R2
=
500 Ω
,
TA = 25°C
TA = –40°C
to 85°C
TA = 0°C
to 70°C
UNIT
MIN MAX MIN MAX MIN MAX
t
PLH
1 6 1 7.2 1 7
t
PHL
A or B
B or A
1.5 6.6 1.5 7.6 1.5 7
ns
t
PZH
1.5 9.4 1.5 11.2 1.5 10.9
t
PZL
OE
A or B
1.5 10.2 1.5 11.8 1.5 11.6
ns
t
PHZ
1.5 8.3 1.5 9.7 1.5 9.3
t
PLZ
OE
A or B
1.5 7.8 1.5 9.6 1.5 9.1
ns
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
SN64BCT245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS040A – JANUARY 1990 – REVISED JANUAR Y 1994
3–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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Copyright 1998, Texas Instruments Incorporated
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