74ALS245A1 查看數據表（PDF） - Philips Electronics
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74ALS245A1 Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal transceiver (3-State)
Product specification
74ALS245A/74ALS245A-1
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS1
LIMITS
MIN TYP2 MAX
UNIT
VCC±10%, VIL = MAX,
IOH = –0.4mA VCC – 2
V
VOH
High-level output voltage
VIH = MIN
IOH = –3mA
2.4
3.2
V
VCC = MIN, VIL = MAX,
VIH = MIN
IOH = –15mA
2.0
V
VOL
Low-level output voltage
All versions
VCC = MIN, VIL = MAX,
VIH = MIN
IOL = 12mA
IOL = 24mA
-1 version
VCC = 4.75V, VIL = MAX,
VIH = MIN
IOL = 48mA
0.25 0.40
V
0.35 0.50
V
0.35 0.50
V
VIK
Input clamp voltage
VCC = MIN, II = IIK
–0.73 –1.5
V
II
Input current at maxi-
mum input voltage
OE or T/R VCC = MAX, VI = 7.0V
A or B ports VCC = MAX, VI = 5.5V
0.1
mA
0.1
mA
IIH
High-level input current3
VCC = MAX, VI = 2.7V
20
µA
IIL
Low-level input current3
VCC = MAX, VI = 0.4V
–0.1
mA
IO
Output current4
VCC = MAX, VO = 2.25V
–30
–112
mA
ICCH
28
45
mA
ICC
Supply current (total)
ICCL
VCC = MAX
40
55
mA
ICCZ
44
58
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at VCC = 5V, Tamb = 25°C.
3. For I/O ports, the parameter IIH and IIL include the off-state current.
4. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
tPLH
Propagation delay
tPHL
An to Bn, Bn to An
tPZH
Output enable time
tPZL
to High or Low level
tPHZ
Output disable time
tPLZ
from High or Low level
TEST CONDITION
Waveform 1
Waveform 2
Waveform 3
Waveform 2
Waveform 3
LIMITS
Tamb = 0°C to +70°C
VCC = +5.0V ± 10%
CL = 50pF, RL = 500Ω
MIN
MAX
2.0
10.0
2.0
10.0
3.0
20.0
3.0
20.0
2.0
10.0
4.0
15.0
UNIT
ns
ns
ns
1991 Jun 03
5
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