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HD74LS242 Datasheet, PDF (3/7 Pages) Hitachi Semiconductor – Quadruple Bus Transceivers(with three-state outputs) | |||
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HD74LS242
Electrical Characteristics
(Ta = â20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
Hysteresis
VIH
2.0
VIL
â
VT+ â VTâ
0.2
Output voltage
2.4
VOH
2
â
VOL
â
Off-state output current
IOZH
â
IOZL
â
IIH
â
A Input
â
â
â
V
â
0.8
V
0.4
â
V VCC = 4.75 V
â
â
â
â
V
VIL = 0.8 V, IOH = â 3 mA
VIL = 0.5 V, IOH = â 15 mA
VCC = 4.75 V,
VIH = 2 V
â
0.4
V
IOL = 12 mA
â
0.5
IOL = 24 mA
VCC = 4.75 V, VIH = 2 V,
VIL = 0.8 V
â
40
µA
VO = 2.7 V
â â200
VO = 0.4 V
VCC = 5.25 V, VIH = 2 V,
VIL = 0.8 V
â
20
µA VCC = 5.25 V, VI = 2.7 V
â
â0.2
VCC = 5.25 V, VI = 0.4 V,
GAB or GBA at GND
Input
B Input
IIL
current
GAB or GBA
A or B
GAB or GBA
II
Short-circuit output
current
IOS
â
â
â0.2
mA VCC = 5.25 V, VI = 0.4 V,
GAB or GBA at 4.5 V
â
â
â0.2
VCC = 5.25 V, VI = 0.4 V
â
â
0.1
mA VCC = 5.25 V, VI = 5.5 V
â
â
0.1
VCC = 5.25 V, VI = 7 V
â40
â
â225 mA VCC = 5.25 V
ICCH
â
22
38
Supply current**
ICCL
â
29
50
mA VCC = 5.25 V
ICCZ
â
29
50
Input clamp voltage
VIK
â
â
â1.5
V VCC = 4.75 V, IIN = â18 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
â
9
14
Output enable time
tPHL
â
tZL
â
12
20
18
30
CL = 45 pF, RL = 667 â¦
ns
tZH
â
15
23
Output disable time
tLZ
â
15
25
tHZ
â
10
18
CL = 5 pF, RL = 667 â¦
Rev.3.00, Jul.15.2005, page 3 of 6
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