SN54F245, SN74F245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS010A – MARCH 1987 – REVISED OCTOBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
•3-State Outputs Drive Bus Lines Directly
•Package Options Include Plastic
Small-Outline (SOIC) and Shrink
Small-Outline (SSOP) Packages, Ceramic
Chip Carriers, and Plastic and Ceramic
DIPs
description
These octal bus transceivers are 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 SN74F245 is available in TI’s shrink
small-outline package (DB), which provides the
same I/O pin count and functionality of standard
small-outline packages in less than half the
printed-circuit-board area.
The SN54F245 is characterized for operation over
the full military temperature range of –55°C to
125°C. The SN74F245 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OPERATION
OE DIR
OPERATION
L L B data to A bus
L H A data to B bus
H X Isolation
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
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
SN54F245 ...J PACKAGE
SN74F245 . . . DB, DW, OR N PACKAGE
(TOP VIEW)
3212019
910 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 VCC
SN54F245 . . . FK 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.
SN54F245, SN74F245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS010A – MARCH 1987 – REVISED OCTOBER 1993
2–2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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.
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 (except I/O ports) (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state –0.5 V to VCC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54F245 (A1 thru A8) 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN54F245 (B1 thru B8) 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F245 (A1 thru A8) 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F245 (B1 thru B8) 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54F245 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F245 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 af fect device reliability.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
SN54F245, SN74F245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS010A – MARCH 1987 – REVISED OCTOBER 1993
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54F245 SN74F245
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.8 0.8 V
IIK Input clamp current –18 –18 mA
IOH
High level out
p
ut current
A1 thru A8 –3 –3
mA
I
OH
High
-
le
v
el
o
u
tp
u
t
c
u
rrent
B1 thru B8 –12 –15
mA
I
OL
Low level out
p
ut current
A1 thru A8 20 24
mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
B1 thru B8 48 64
mA
TAOperating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54F245 SN74F245
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
A1 thru A8
VCC =45V
IOH = – 1 mA 2.5 3.4 2.5 3.4
A1
thr
u
A8
V
CC =
4
.
5
V
IOH = – 3 mA 2.4 3.3 2.4 3.3
VOH
B1 thru B8
VCC =45V
IOH = – 12 mA 2 3.2 V
B1
thr
u
B8
V
CC =
4
.
5
V
IOH = – 15 mA 2 3.1
Any output VCC = 4.75 V, IOH = –1 mA to – 3 mA 2.7
A1 thru A8
VCC =45V
IOL = 20 mA 0.3 0.5
A1
thr
u
A8
V
CC =
4
.
5
V
IOL = 24 mA 0.35 0.5
V
OL
B1 thru B8
VCC =45V
IOL = 48 mA 0.38 0.55
V
B1
thr
u
B8
V
CC =
4
.
5
V
IOL = 64 mA 0.42 0.55
A and B
VCC =55V
VI = 5.5 V 1 1
mA
IDIR, OE
V
CC =
5
.
5
V
VI = 7 V 0.1 0.1
mA
A and B
VCC =55V
VI=27V
70 70
µA
IH
DIR, OE
V
CC =
5
.
5
V
,
V
I =
2
.
7
V
20 20 µ
A
A and B
VCC =55V
VI=05V
–0.65 –0.65
mA
IL
DIR, OE
V
CC =
5
.
5
V
,
V
I =
0
.
5
V
– 1.2 – 1.2
mA
A1 thru A8
VCC =55V
VO=0
–60 –150 –60 –150
mA
OS
B1 thru B8
V
CC =
5
.
5
V
,
V
O =
0
–100 –225 –100 –225
mA
Outputs high 70 90 70 90
ICC VCC = 5.5 V Outputs low 95 120 95 120 mA
Outputs disabled 85 110 85 110
†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 shorted at a time, and the duration of the short circuit should not exceed one second.
SN54F245, SN74F245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS010A – MARCH 1987 – REVISED OCTOBER 1993
2–4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Note 2)
PARAMETER FROM
(
INPUT
)
TO
(
OUTPUT
)
VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX†UNIT
(INPUT)
(OUTPUT)
′F245 SN54F245 SN74F245
MIN TYP MAX MIN MAX MIN MAX
tPLH
AorB
BorA
1.7 3.8 6 1.2 7.5 1.7 7
ns
tPHL
A
or
B
B
or
A
1.7 4.2 6 1.2 7.5 1.7 7
ns
tPZH
OE
AorB
2.2 4.9 7 1.7 9 2.2 8
ns
tPZL
OE
A
or
B
2.7 5.6 8 2.2 10 2.7 9
ns
tPHZ
OE
AorB
2.2 4.6 6.5 1.7 9 2.2 7.5
ns
tPLZ
OE
A
or
B
1.2 4.6 6.5 1.2 10 1.2 7.5
ns
†For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
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Copyright 1998, Texas Instruments Incorporated