SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCES008F JULY 1995 - REVISED JUNE 1998
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
EPIC
TM
(Enhanced-Performance Implanted
CMOS) Submicron Process
D
Typical V
OLP
(Output Ground Bounce)
< 0.8 V at V
CC
= 3.3 V, T
A
= 25
C
D
Typical V
OHV
(Output V
OH
Undershoot)
> 2 V at V
CC
= 3.3 V, T
A
= 25
C
D
Power Off Disables Outputs, Permitting
Live Insertion
D
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
D
Latch-Up Performance Exceeds 250 mA Per
JESD 17
D
Support Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V V
CC
)
D
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Flat (W) Package,
Ceramic Chip Carriers (FK), and DIPs (J)
description
The SN54LVCH245A octal bus transceiver is designed for 2.7-V to 3.6-V V
CC
operation and the
SN74LVCH245A octal bus transceiver is designed for 1.65-V to 3.6-V V
CC
operation.
These devices are designed for asynchronous 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 on 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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN54LVCH245A is characterized for operation over the full military temperature range of 55
C to 125
C.
The SN74LVCH245A is characterized for operation from 40
C to 85
C.
Copyright
1998, 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.
EPIC is a trademark of Texas Instruments Incorporated.
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.
SN54LVCH245A . . . J OR W PACKAGE
SN74LVCH245A . . . DB, DW, OR PW 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
SN54LVCH245A . . . FK PACKAGE
(TOP VIEW)
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
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.
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCES008F JULY 1995 - REVISED JUNE 1998
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 symbol
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
B2
17
B3
16
B4
15
A5
6
A6
7
A7
8
A8
9
A2
3
A3
4
A4
5
OE
A1
2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCES008F JULY 1995 - REVISED JUNE 1998
3
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 6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
: (see Note 1)
0.5 V to 6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high-impedance or power-off state, V
O
(see Note 1)
0.5 V to 6.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or low state, V
O
(see Notes 1 and 2)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
100 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 3): DB package
115
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
97
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
128
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 negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The value of VCC is provided in the recommended operating conditions table.
3. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions (see Note 4)
SN54LVCH245A
SN74LVCH245A
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
Operating
2
3.6
1.65
3.6
V
VCC
Supply voltage
Data retention only
1.5
1.5
V
VCC = 1.65 V to 1.95 V
0.65
VCC
VIH
High-level input voltage
VCC = 2.3 V to 2.7 V
1.7
V
VCC = 2.7 V to 3.6 V
2
2
VCC = 1.65 V to 1.95 V
0.35
VCC
VIL
Low-level input voltage
VCC = 2.3 V to 2.7 V
0.7
V
VCC = 2.7 V to 3.6 V
0.8
0.8
VI
Input voltage
0
5.5
0
5.5
V
VO
Output voltage
High or low state
0
VCC
0
VCC
V
VO
Output voltage
3 state
0
5.5
0
5.5
V
VCC = 1.65 V
4
IOH
High level output current
VCC = 2.3 V
8
mA
IOH
High-level output current
VCC = 2.7 V
12
12
mA
VCC = 3 V
24
24
VCC = 1.65 V
4
IOL
Low level output current
VCC = 2.3 V
8
mA
IOL
Low-level output current
VCC = 2.7 V
12
12
mA
VCC = 3 V
24
24
t/
v
Input transition rise or fall rate
0
10
0
10
ns/V
TA
Operating free-air temperature
55
125
40
85
C
NOTE 4: All unused control 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.
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCES008F JULY 1995 - REVISED JUNE 1998
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
V
SN54LVCH245A
SN74LVCH245A
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
IOH = 100
A
1.65 V to 3.6 V
VCC0.2
IOH = 100
A
2.7 V to 3.6 V
VCC0.2
IOH = 4 mA
1.65 V
1.2
VOH
IOH = 8 mA
2.3 V
1.7
V
IOH = 12 mA
2.7 V
2.2
2.2
IOH = 12 mA
3 V
2.4
2.4
IOH = 24 mA
3 V
2.2
2.2
IOL = 100
A
1.65 V to 3.6 V
0.2
IOL = 100
A
2.7 V to 3.6 V
0.2
VOL
IOL = 4 mA
1.65 V
0.45
V
VOL
IOL = 8 mA
2.3 V
0.7
V
IOL = 12 mA
2.7 V
0.4
0.4
IOL = 24 mA
3 V
0.55
0.55
II
Control inputs
VI = 0 to 5.5 V
3.6 V
5
5
A
Ioff
VI or VO = 5.5 V
0
10
A
VI = 0.58 V
1 65 V
VI = 1.07 V
1.65 V
VI = 0.7 V
2 3 V
45
II(hold)
VI = 1.7 V
2.3 V
45
A
(
)
VI = 0.8 V
3 V
75
75
VI = 2 V
3 V
75
75
VI = 0 to 3.6 V
3..6 V
500
500
IOZ
VO = 0 to 5.5 V
3.6 V
15
10
A
ICC
VI = VCC or GND
IO = 0
3 6 V
10
10
A
ICC
3.6 V
VI
5.5 V#
IO = 0
3.6 V
10
10
A
ICC
One input at VCC 0.6 V,
Other inputs at
VCC or GND
2.7 V to 3.6 V
500
500
A
Ci
Control inputs
VI = VCC or GND
3.3 V
4
12
4
pF
Cio
A or B ports
VO = VCC or GND
3.3 V
5.5
12
5.5
pF
All typical values are at VCC = 3.3 V, TA = 25
C.
This information was not available at the time of publication.
This is the bus-hold maximum dynamic current required to switch the input from one state to another.
For I/O ports, the parameter IOZ includes the input leakage current.
# This applies in the disabled state only.
SN54LVCH245A, SN74LVCH245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCES008F JULY 1995 - REVISED JUNE 1998
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figure 3)
SN54LVCH245A
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 2.7 V
VCC = 3.3 V
0.3 V
UNIT
MIN
MAX
MIN
MAX
tpd
A or B
B or A
8
1
7
ns
ten
OE
A or B
9.5
1
8.5
ns
tdis
OE
A or B
8.5
1
7.5
ns
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figures 1 through 3)
SN74LVCH245A
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 1.8 V
0.15 V
VCC = 2.5 V
0.2 V
VCC = 2.7 V
VCC = 3.3 V
0.3 V
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
tpd
A or B
B or A
7.3
1.5
6.3
ns
ten
OE
A or B
9.5
1.5
8.5
ns
tdis
OE
A or B
8.5
1.7
7.5
ns
tsk(o)
1
ns
This information was not available at the time of publication.
Skew between any two outputs of the same package switching in the same direction
operating characteristics, T
A
= 25
C
PARAMETER
TEST
CONDITIONS
VCC = 1.8 V
0.15 V
VCC = 2.5 V
0.2 V
VCC = 3.3 V
0.3 V
UNIT
CONDITIONS
TYP
TYP
TYP
Cpd
Power dissipation capacitance
Outputs enabled
f = 10 MHz
47
pF
Cpd
per transceiver
Outputs disabled
f = 10 MHz
2
pF
This information was not available at the time of publication.
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