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HD74LS242
Quadruple Bus Transceivers (with three-state outputs)
REJ03D0461–0300
Rev.3.00
Jul.15.2005
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS242P
DILP-14 pin
PRDP0014AB-B
(DP-14AV)
P
HD74LS242FPEL SOP-14 pin (JEITA) PRSP0014DF-B
(FP-14DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Pin Arrangement
GAB 1
NC 2
1A 3
2A 4
3A 5
4A 6
GND 7
14 VCC
13 GBA
12 NC
11 1B
10 2B
9 3B
8 4B
(Top view)
Function Table
Control input
Data port status
GAB
GBA
A
B
H
H
Inverting output
Input
LH
*
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

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HD74LS242
Block Diagram
GAB
A
GBA
Transceiver (1/4)
B
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
VCC
7
Input voltage
GAB, GBA
A, B
VIN
VIN
7
5.5
Power dissipation
PT 400
Storage temperature
Tstg –65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Symbol
VCC
IOH
IOL
Topr
Min
4.75
–20
Typ
5.00
25
Max
5.25
–15
24
75
Unit
V
V
V
mW
°C
Unit
V
mA
mA
°C
Rev.3.00, Jul.15.2005, page 2 of 6

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HD74LS242
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
Hysteresis
Output voltage
Off-state output current
A Input
VIH
VIL
VT+ – VT–
VOH
VOL
IOZH
IOZL
IIH
2.0
0.2
2.4
2
—— V
— 0.8 V
0.4 —
V VCC = 4.75 V
V
VIL = 0.8 V, IOH = – 3 mA
VIL = 0.5 V, IOH = – 15 mA
VCC = 4.75 V,
VIH = 2 V
— 0.4 V IOL = 12 mA
— 0.5
IOL = 24 mA
VCC = 4.75 V, VIH = 2 V,
VIL = 0.8 V
— 40 µA VO = 2.7 V
— –200
VO = 0.4 V
VCC = 5.25 V, VIH = 2 V,
VIL = 0.8 V
— 20 µA VCC = 5.25 V, VI = 2.7 V
— –0.2
VCC = 5.25 V, VI = 0.4 V,
GAB or GBA at GND
Input
B Input
current
GAB or GBA
A or B
GAB or GBA
Short-circuit output
current
IIL
II
IOS
–0.2
mA VCC = 5.25 V, VI = 0.4 V,
GAB or GBA at 4.5 V
— — –0.2
VCC = 5.25 V, VI = 0.4 V
— — 0.1 mA VCC = 5.25 V, VI = 5.5 V
— — 0.1
VCC = 5.25 V, VI = 7 V
–40 — –225 mA VCC = 5.25 V
ICCH — 22 38
Supply current**
ICCL — 29 50 mA VCC = 5.25 V
ICCZ — 29 50
Input clamp voltage
VIK — — –1.5 V VCC = 4.75 V, IIN = –18 mA
Notes: * VCC = 5 V, Ta = 25°C
** With all outputs open, ICC is measured with transceivers enabled in one direction only, or with all transceivers
disabled.
Switching Characteristics
(VCC = 5 V, Ta = 25°C)
Item
Symbol
min.
typ.
max.
Unit
Condition
Propagation delay time
tPLH
9
14
Output enable time
tPHL
tZL
12
20
18
30
CL = 45 pF, RL = 667
ns
tZH — 15 23
Output disable time
tLZ — 15 25
tHZ — 10 18
CL = 5 pF, RL = 667
Rev.3.00, Jul.15.2005, page 3 of 6

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HD74LS242
Testing Method
Test Circuit
4.5 V
VCC
Input
P.G.
Zout = 50
GAB
GBA
Output
RL
S1
1B S3
1A
CL 5 k
Notes:
1. 2A-2B, 3A-3B, 4A-4B are identical to abobe load circuit.
2. CL includes probe and jig capacitance.
3. S3 is a input-output switch.
4. All diodes are 1S2074(H).
S2
Waveforms 1
tTLH
tTHL
Input A
(or B)
Output B
(or A)
10 %
90 %
1.3 V
tPHL
90 %
1.3 V
10 %
tPLH
1.3 V
1.3 V
Note: Input pulse: tTLH 15 ns, tTHL 6 ns, PRR = 1 MHz, duty cycle 50%
3V
0V
VOH
VOL
Rev.3.00, Jul.15.2005, page 4 of 6

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HD74LS242
Waveforms 2
GAB
tTHL
90 %
1.3 V
10 %
GBA
Waveform-a
Waveform-b
1.3 V
tZL
S1 close
S2 open
tZH
S1 open
S2 close
tTLH
3 V 90 %
10 % 1.3 V
0V
3V
0V
~~ 4.5 V
1.3 V
VOL
1.3 V
VOH
~~ 0 V
1.3 V
tLZ
tHZ
3V
0V
3V
0V
S1, S2 close ~~ 1.5 V
0.5 V
VOL
VOH
0.5 V ~~ 1.5 V
S1, S2 close
Notes:
1. Input pulse: tTLH 15 ns, tTHL 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