SDFS062A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
SN54F242 . . . J PACKAGE
SN74F242 . . . D OR N PACKAGE
(TOP VIEW)
•
•
•
•
Asynchronous Communication Between
Data Buses
Local Bus-Latch Capability
Inverting Logic
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These quadruple bus transceivers are designed
for asynchronous communications between data
buses. The control function implementation allows
for maximum flexibility in timing. These devices
allow data transmission from the A bus to the
B bus or from the B bus to the A bus depending
upon the logic levels at the output-enable (OEBA
and OEAB) inputs. The output-enable inputs can
be used to disable the device so that the buses are
effectively isolated.
The dual-enable configuration gives the
quadruple bus transceivers the capability to store
data by simultaneous enabling of OEBA and
OEAB. Each output reinforces its input in this
transceiver configuration. Thus, when both control
inputs are enabled and all other data sources to
the two sets of bus lines are at high impedance,
both sets of bus lines (eight in all) remain at their
states. The 4-bit codes appearing on the two sets
of buses will be complementary for the
′F242.
OEAB
NC
A1
A2
A3
A4
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
OEBA
NC
B1
B2
B3
B4
SN54F242 . . . FK PACKAGE
(TOP VIEW)
A1
NC
A2
NC
A3
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
NC
OEAB
NC
V
CC
OEBA
NC
NC
B1
NC
B2
NC − No internal connection
FUNCTION
A to B
B to A
Isolation
Latch A and B
(A = B)
Copyright
1993, Texas Instruments Incorporated
The SN54F242 is characterized for operation over the full military temperature range of − 55°C to 125°C. The
SN74F242 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OEAB
L
H
H
L
OEBA
L
H
L
H
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
POST OFFICE BOX 1443
•
HOUSTON, TEXAS 77251−1443
•
DALLAS, TEXAS 75265
A4
GND
NC
B4
B3
2−1
SDFS062A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
logic symbol
†
OEBA
OEAB
A1
3
13
1
EN1
EN2
1
2
11
10
B1
B2
A2
A3
4
5
9
8
B3
B4
A4
6
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
OEAB
A1
1
3
13
11
OEBA
B1
A2
4
10
B2
A3
5
9
B3
A4
6
8
B4
Pin numbers shown are for the D, J, and N packages.
2−2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
SDFS062A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
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, V
I
(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 V
CC
Current into any output in the low state: SN54F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
SN74F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Operating free-air temperature range: SN54F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 affect device reliability.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
recommended operating conditions
SN54F242
MIN
VCC
VIH
VIL
IIK
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature
−55
4.5
2
0.8
−18
− 12
48
125
0
NOM
5
MAX
5.5
SN74F242
MIN
4.5
2
0.8
−18
− 15
64
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
2−3
SDFS062A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3 STATE OUTPUTS
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VCC = 4.5 V,
VCC = 4.5 V
VCC = 4.75 V,
VOL
A or B port
II
IIH
IIL‡
IOS§
ICC
Control inputs
A or B port‡
Control inputs
VCC = 5.5 V
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
See Note 2
VCC = 4.5 V
TEST CONDITIONS
II = − 18 mA
IOH = − 3 mA
IOH = − 12 mA
IOH = − 15 mA
IOH = − 3 mA
IOL = 48 mA
IOL = 64 mA
VI = 5.5 V
VI = 7 V
VI = 2.7 V
VI = 0.5 V
VO = 0
Outputs high
Outputs low
Outputs disabled
SN54F242
MIN TYP†
MAX
−1.2
2.4
2
3.3
3.2
2
2.7
0.38
0.55
0.42
1
0.1
70
20
−1
−100
30
46
42
−225
46
69
63
−100
30
46
42
0.55
1
0.1
70
20
−1
−225
46
69
63
mA
mA
µA
A
mA
mA
V
3.1
V
2.4
3.3
SN74F242
MIN TYP†
MAX
−1.2
UNIT
V
VOH
† 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.
NOTE 2: ICC is measured either with all transceivers enabled in only one direction or all transceivers disabled.
switching characteristics (see Note 3)
VCC = 5 V,
CL = 50 pF,
RL = 500
Ω,
TA = 25°C
′F242
MIN
tPLH
tPHL
tPZL
tPZH
tPHZ
tPLZ
2.2
A or B
Enable
Disable
B or A
A or B
A or B
1
2.7
2.7
1.8
2.7
TYP
4.1
2.6
5.6
6.1
6.6
5.6
MAX
6.5
4.5
7.5
9
9
9.5
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
Ω,
TA = MIN to MAX¶
SN54F242
MIN
2.2
0.5
2.2
2.2
1.8
2.3
MAX
9
5
10
12
11
13.5
SN74F242
MIN
2.2
1
2.7
2.7
1.8
2.7
MAX
7.5
4.5
8.5
10.5
9.5
11
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 3: Load circuits and waveforms are shown in Section 1.
2−4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
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