SNJ54F242FKR [TI]
F/FAST SERIES, 4-BIT TRANSCEIVER, INVERTED OUTPUT, CQCC20, CERAMIC, LCC-20;
| 型号： | SNJ54F242FKR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | F/FAST SERIES, 4-BIT TRANSCEIVER, INVERTED OUTPUT, CQCC20, CERAMIC, LCC-20 输出元件 逻辑集成电路 |
| 文件： | 总5页 (文件大小：75K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS062A – D2932, MARCH 1987 – REVISED OCTOBER 1993
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
OEAB
NC
V
CC
1
2
3
4
5
6
7
14
13
12
11
10
9
OEBA
NC
B1
A1
A2
A3
B2
A4
B3
description
GND
B4
8
These quadruple bus transceivers are designed
for asynchronous communications between data
buses. Thecontrolfunctionimplementationallows
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.
SN54F242 . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
NC
NC
B1
A1
NC
A2
4
5
6
7
8
17
16
15
14
NC
B2
NC
A3
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
transceiverconfiguration. Thus, whenbothcontrol
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.
9 10 11 12 13
NC – No internal connection
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
FUNCTION
OEAB
OEBA
L
H
H
L
H
L
A to B
B to A
Isolation
Latch A and B
(A = B)
L
H
Copyright 1993, 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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS062A – D2932, MARCH 1987 – REVISED OCTOBER 1993
†
logic symbol
13
OEBA
1
EN1
EN2
OEAB
3
11
10
1
A1
B1
B2
2
4
A2
5
9
8
A3
B3
B4
6
A4
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
1
3
13
11
OEAB
OEBA
B1
A1
A2
A3
A4
4
5
6
10
9
B2
B3
B4
8
Pin numbers shown are for the D, J, and N packages.
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS062A – D2932, MARCH 1987 – REVISED OCTOBER 1993
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1.2 V to 7 V
I
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
SN74F242
UNIT
MIN NOM
MAX
MIN NOM
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
High-level input voltage
Low-level input voltage
Input clamp current
0.8
–18
– 12
48
0.8
–18
– 15
64
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
Operating free-air temperature
OH
OL
T
A
–55
125
0
70
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F242, SN74F242
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDFS062A – D2932, MARCH 1987 – REVISED OCTOBER 1993
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54F242
SN74F242
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
= 4.5 V,
= 4.5 V
I = –18 mA
–1.2
–1.2
V
IK
CC
I
I
I
I
I
I
I
= – 3 mA
= – 12 mA
= – 15 mA
= – 3 mA
= 48 mA
2.4
2
3.3
3.2
2.4
3.3
3.1
OH
OH
OH
OH
OL
OL
CC
V
OH
2
V
V
= 4.75 V,
= 4.5 V
2.7
CC
0.38
0.55
V
OL
V
CC
= 64 mA
0.42
0.55
1
A or B port
V = 5.5 V
I
1
0.1
70
I
I
V
V
= 5.5 V
= 5.5 V,
mA
µA
I
CC
Control inputs
V = 7 V
I
0.1
70
‡
A or B port
V = 2.7 V
I
IH
CC
Control inputs
20
20
‡
I
I
V
V
= 5.5 V,
= 5.5 V,
V = 0.5 V
– 1
– 1
–225
46
mA
mA
IL
CC
I
§
V
O
= 0
–100
–225 –100
OS
CC
Outputs high
Outputs low
30
46
42
46
69
63
30
46
42
V
CC
= 5.5 V,
I
69
mA
CC
See Note 2
Outputs disabled
63
†
‡
§
All typical values are at V
For I/O ports, the parameters I and I include the off-state output current.
= 5 V, T = 25°C.
A
IH IL
CC
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
is measured either with all transceivers enabled in only one direction or all transceivers disabled.
NOTE 2:
I
CC
switching characteristics (see Note 3)
V
C
R
= 5 V,
= 50 pF,
= 500 Ω,
= 25°C
V
C
R
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
L
CC
L
L
= 500Ω,
= MIN to MAX
FROM
(INPUT)
TO
(OUTPUT)
¶
PARAMETER
UNIT
T
A
T
A
′F242
TYP
4.1
SN54F242
SN74F242
MIN
2.2
1
MAX
6.5
4.5
7.5
9
MIN
2.2
0.5
2.2
2.2
1.8
2.3
MAX
MIN
2.2
1
MAX
t
t
9
5
7.5
4.5
8.5
10.5
9.5
11
PLH
A or B
Enable
Disable
B or A
A or B
A or B
ns
ns
ns
2.6
PHL
t
2.7
2.7
1.8
2.7
5.6
10
2.7
2.7
1.8
2.7
PZL
t
t
6.1
12
PZH
6.6
9
11
PHZ
t
5.6
9.5
13.5
PLZ
¶
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
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright 1998, Texas Instruments Incorporated
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