HD74LS242
Quadruple Bus Transceivers (with three-state outputs)
REJ03D0461–0300
Rev.3.00
Jul.15.2005
Features
•
Ordering Information
Part Name
HD74LS242P
HD74LS242FPEL
Package Type
DILP-14 pin
SOP-14 pin (JEITA)
Package Code
(Previous Code)
PRDP0014AB-B
(DP-14AV)
PRSP0014DF-B
(FP-14DAV)
Package
Abbreviation
P
FP
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
Note: Please consult the sales office for the above package availability.
Pin Arrangement
GAB
NC
1A
2A
3A
4A
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
GBA
NC
1B
2B
3B
4B
(Top view)
Function Table
Control input
Data port status
GAB
GBA
A
B
H
H
Inverting output
Input
L
H
*
H
L
Isolated
Isolated
L
L
Input
Inverting output
Notes: 1. H; high level, L; low level
2. *; Possibly destructive oscillation may occur if the transceivers are enabled in both directions at once.
Rev.3.00, Jul.15.2005, page 1 of 6
HD74LS242
Block Diagram
GAB
Transceiver (1/4)
A
B
GBA
Absolute Maximum Ratings
Item
Supply voltage
Input voltage
Power dissipation
Storage temperature
GAB,
GBA
A, B
Symbol
V
CC
V
IN
V
IN
P
T
Tstg
Ratings
7
7
5.5
400
–65 to +150
Unit
V
V
V
mW
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Symbol
V
CC
I
OH
I
OL
Topr
Min
4.75
—
—
–20
Typ
5.00
—
—
25
Max
5.25
–15
24
75
Unit
V
mA
mA
°C
Rev.3.00, Jul.15.2005, page 2 of 6
HD74LS242
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Input voltage
Hysteresis
Symbol
V
IH
V
IL
V
T+
– V
T–
V
OH
Output voltage
V
OL
Off-state output current
I
OZH
I
OZL
I
IH
min.
2.0
—
0.2
2.4
2
—
—
—
—
—
—
I
IL
—
—
—
—
–40
—
—
—
—
typ.*
—
—
0.4
—
—
—
—
—
—
—
—
—
—
—
—
—
22
29
29
—
max.
—
0.8
—
—
—
0.4
0.5
40
–200
20
–0.2
–0.2
–0.2
0.1
0.1
–225
38
50
50
–1.5
mA
Unit
V
V
V
V
V
µA
µA
Condition
V
CC
= 4.75 V
V
IL
= 0.8 V, I
OH
= – 3 mA
V
CC
= 4.75 V,
V
IH
= 2 V
V
IL
= 0.5 V, I
OH
= – 15 mA
I
OL
= 12 mA
V
CC
= 4.75 V, V
IH
= 2 V,
V
IL
= 0.8 V
I
OL
= 24 mA
V
O
= 2.7 V
V
CC
= 5.25 V, V
IH
= 2 V,
V
IL
= 0.8 V
V
O
= 0.4 V
V
CC
= 5.25 V, V
I
= 2.7 V
V
CC
= 5.25 V, V
I
= 0.4 V,
GAB
or GBA at GND
V
CC
= 5.25 V, V
I
= 0.4 V,
GAB
or GBA at 4.5 V
V
CC
= 5.25 V, V
I
= 0.4 V
V
CC
= 5.25 V, V
I
= 5.5 V
V
CC
= 5.25 V, V
I
= 7 V
V
CC
= 5.25 V
A Input
Input
current
B Input
GAB
or GBA
A or B
GAB
or GBA
Short-circuit output
current
Supply current**
I
I
I
OS
I
CCH
I
CCL
mA
mA
mA
V
CC
= 5.25 V
I
CCZ
Input clamp voltage
V
IK
V
V
CC
= 4.75 V, I
IN
= –18 mA
Notes: * V
CC
= 5 V, Ta = 25°C
** With all outputs open, I
CC
is measured with transceivers enabled in one direction only, or with all transceivers
disabled.
Switching Characteristics
(V
CC
= 5 V, Ta = 25°C)
Item
Propagation delay time
Output enable time
Output disable time
Symbol
t
PLH
t
PHL
t
ZL
t
ZH
t
LZ
t
HZ
min.
—
—
—
—
—
—
typ.
9
12
20
15
15
10
max.
14
18
30
23
25
18
Unit
Condition
C
L
= 45 pF, R
L
= 667
Ω
ns
C
L
= 5 pF, R
L
= 667
Ω
Rev.3.00, Jul.15.2005, page 3 of 6
HD74LS242
Testing Method
Test Circuit
4.5 V
V
CC
GAB
Output
R
L
S
1
See function table
Input
P.G.
Zout = 50
Ω
1B
1A
S
3
C
L
GBA
5 kΩ
S
2
Notes:
1.
2.
3.
4.
2A-2B, 3A-3B, 4A-4B are identical to abobe load circuit.
C
L
includes probe and jig capacitance.
S
3
is a input-output switch.
All diodes are 1S2074(H).
Waveforms 1
t
TLH
Input A
(or B)
90 %
1.3 V
t
PHL
t
PLH
Output B
(or A)
1.3 V
1.3 V
V
OL
t
THL
90 %
1.3 V
3V
10 %
0V
V
OH
10 %
Note:
Input pulse: t
TLH
≤
15 ns, t
THL
≤
6 ns, PRR = 1 MHz, duty cycle 50%
Rev.3.00, Jul.15.2005, page 4 of 6
HD74LS242
Waveforms 2
t
THL
GAB
90 %
1.3 V
3V
10 %
0V
3V
GBA
1.3 V
t
ZL
Waveform-a
S
1
close
S
2
open
t
ZH
Waveform-b
S
1
open
S
2
close
1.3 V
~0V
~
1.3 V
V
OL
V
OH
t
HZ
0V
~ 4.5 V
~
t
LZ
S
1,
S
2
close
0.5 V
V
OL
V
OH
0.5 V ~
~ 1.5 V
S
1,
S
2
close
1.3 V
0V
~
~ 1.5 V
10 %
t
TLH
90 %
1.3 V
0V
3V
3V
Notes:
1. Input pulse: t
TLH
≤
15 ns, t
THL
≤
6 ns, PRR = 1 MHz, duty cycle 50%
2. Waveform a is an output by internal conditions like "L" except for the case where an output is
disabled by output control.
3. Waveform b is an output by internal conditions like "H" except for the case where an output is
disabled by output control.
Rev.3.00, Jul.15.2005, page 5 of 6
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