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SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131D DECEMBER 1982 REVISED AUGUST 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Wide Operating Voltage Range of 2 V to 6 V
D
High-Current 3-State Outputs Drive Bus
Lines Directly or Up To 15 LSTTL Loads
D
Low Power Consumption, 80-
A Max I
CC
D
Typical t
pd
= 12 ns
D
6-mA Output Drive at 5 V
D
Low Input Current of 1
A Max
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
A2
A1
DIR
B7
B6
OE
A8
GND
B8
V
CC
SN54HC245 . . . FK PACKAGE
(TOP VIEW)
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
SN54HC245 . . . J OR W PACKAGE
SN74HC245 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
description/ordering information
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The
control-function implementation minimizes external timing requirements.
The devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending on
the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the
device so that the buses are effectively isolated.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
40 C to 85 C
PDIP N
Tube of 20
SN74HC245N
SN74HC245N
40 C to 85 C
SOIC DW
Tube of 25
SN74HC245DW
HC245
40 C to 85 C
SOIC DW
Reel of 2000
SN74HC245DWR
HC245
40
C to 85
C
SOP NS
Reel of 2000
SN74HC245NSR
HC245
40
C to 85
C
SSOP DB
Reel of 2000
SN74HC245DBR
HC245
TSSOP PW
Tube of 70
SN74HC245PW
HC245
TSSOP PW
Reel of 2000
SN74HC245PWR
HC245
Reel of 250
SN74HC245PWT
55 C to 125 C
CDIP J
Tube of 20
SNJ54HC245J
SNJ54HC245J
55
C to 125
C
CFP W
Tube of 85
SNJ54HC245W
SNJ54HC245W
LCCC FK
Tube of 55
SNJ54HC245FK
SNJ54HC245FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
2003, 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.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131D DECEMBER 1982 REVISED AUGUST 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
logic diagram (positive logic)
DIR
OE
A1
B1
1
2
18
19
To Seven Other Channels
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) (see Note 1)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) (see Note 1)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
35 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
70 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DB package
70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package
60
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
83
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
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.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131D DECEMBER 1982 REVISED AUGUST 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HC245
SN74HC245
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
2
5
6
2
5
6
V
V
High-level input voltage
VCC = 2 V
1.5
1.5
V
VIH
High-level input voltage
VCC = 4.5 V
3.15
3.15
V
IH
VCC = 6 V
4.2
4.2
V
Low-level input voltage
VCC = 2 V
0.5
0.5
V
VIL
Low-level input voltage
VCC = 4.5 V
1.35
1.35
V
IL
VCC = 6 V
1.8
1.8
VI
Input voltage
0
VCC
0
VCC
V
VO
Output voltage
0
VCC
0
VCC
V
t/ v
Input transition rise/fall time
VCC = 2 V
1000
1000
ns
t/
v
Input transition rise/fall time
VCC = 4.5 V
500
500
ns
VCC = 6 V
400
400
TA
Operating free-air temperature
55
125
40
85
C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
C
SN54HC245
SN74HC245
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
V
V = V
or V
I
= 20 A
2 V
1.9
1.998
1.9
1.9
V
V
V = V
or V
IOH = 20
A
4.5 V
4.4
4.499
4.4
4.4
V
VOH
VI = VIH or VIL
OH
6 V
5.9
5.999
5.9
5.9
V
OH
I
IH
IL
IOH = 6 mA
4.5 V
3.98
4.3
3.7
3.84
IOH = 7.8 mA
6 V
5.48
5.8
5.2
5.34
V
V = V
or V
I
= 20 A
2 V
0.002
0.1
0.1
0.1
V
V
V = V
or V
IOL = 20
A
4.5 V
0.001
0.1
0.1
0.1
V
VOL
VI = VIH or VIL
OL
6 V
0.001
0.1
0.1
0.1
V
OL
I
IH
IL
IOL = 6 mA
4.5 V
0.17
0.26
0.4
0.33
IOL = 7.8 mA
6 V
0.15
0.26
0.4
0.33
II
DIR or OE
VI = VCC or 0
6 V
0.1
100
1000
1000
nA
IOZ
A or B
VO = VCC or 0
6 V
0.01
0.5
10
5
A
ICC
VI = VCC or 0,
IO = 0
6 V
8
160
80
A
Ci
DIR or OE
2 V to 6 V
3
10
10
10
pF
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131D DECEMBER 1982 REVISED AUGUST 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25
C
SN54HC245
SN74HC245
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
t
A or B
B or A
2 V
40
105
160
130
ns
tpd
A or B
B or A
4.5 V
15
21
32
26
ns
pd
6 V
12
18
27
22
t
OE
A or B
2 V
125
230
340
290
ns
ten
OE
A or B
4.5 V
23
46
68
58
ns
en
6 V
20
39
58
49
t
OE
A or B
2 V
74
200
300
250
ns
tdis
OE
A or B
4.5 V
25
40
60
50
ns
dis
6 V
21
34
51
43
t
A or B
2 V
20
60
90
75
ns
tt
A or B
4.5 V
8
12
18
15
ns
t
6 V
6
10
15
13
switching characteristics over recommended operating free-air temperature range, C
L
= 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25
C
SN54HC245
SN74HC245
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
t
A or B
B or A
2 V
54
135
200
170
ns
tpd
A or B
B or A
4.5 V
18
27
40
34
ns
pd
6 V
15
23
34
29
t
OE
A or B
2 V
150
270
405
335
ns
ten
OE
A or B
4.5 V
31
54
81
67
ns
en
6 V
25
46
69
56
t
A or B
2 V
45
210
315
265
ns
tt
A or B
4.5 V
17
42
63
53
ns
t
6 V
13
36
53
45
operating characteristics, T
A
= 25
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance per transceiver
No load
40
pF
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131D DECEMBER 1982 REVISED AUGUST 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
50%
10%
10%
90%
90%
VCC
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
50%
10%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
50%
10%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
50%
10%
90%
VCC
VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
50%
tPZL
tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
0 V
50%
50%
tPZH
tPHZ
Output
Waveform 2
(See Note B)
VCC
Test
Point
From Output
Under Test
CL
(see Note A)
RL
VCC
S1
S2
LOAD CIRCUIT
PARAMETER
CL
tPZH
tpd or tt
tdis
ten
tPZL
tPHZ
tPLZ
1 k
1 k
50 pF
or
150 pF
50 pF
Open
Closed
RL
S1
Closed
Open
S2
Open
Closed
Closed
Open
50 pF
or
150 pF
Open
Open
NOTES: A. CL includes probe and test-fixture capacitance.
B. 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.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR
1 MHz, ZO = 50
, tr = 6 ns, tf = 6 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms