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SN74AHC245-Q1 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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SN54AHC245, SN74AHC245
www.ti.com
SCLS230J – OCTOBER 1995 – REVISED JULY 2014
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
(1)
SN54AHC245
SN74AHC245
UNIT
MIN
MAX
MIN
MAX
VCC
Supply voltage
2
5.5
2
5.5
V
VCC = 2 V
1.5
1.5
VIH
High-level input voltage
VCC = 3 V
2.1
2.1
V
VCC = 5.5 V
3.85
3.85
VCC = 2 V
0.5
0.5
VIL
Low-level input voltage
VCC = 3 V
0.9
0.9
V
VCC = 5.5 V
1.65
1.65
VI
Input voltage
OE or DIR
0
5.5
0
5.5
V
VO
Output voltage
A or B
0
VCC
0
VCC
V
VCC = 2 V
–50
–50
µA
IOH
High-level output current
VCC = 3.3 V ± 0.3 V
–4
–4
mA
VCC = 5 V ± 0.5 V
–8
–8
VCC = 2 V
50
50
µA
IOL
Low-level output current
VCC = 3.3 V ± 0.3 V
4
4
mA
VCC = 5 V ± 0.5 V
8
8
VCC = 3.3 V ± 0.3 V
100
100
∆t/∆v
Input transition rise or fall rate
ns/V
VCC = 5 V ± 0.5 V
20
20
TA
Operating free-air temperature
–55
125
–40
125
°C
(1)
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs (SCBA004).
7.4 Thermal Information
DB
DGV
DW
N
NS
PW
RGY
THERMAL METRIC(1)
UNIT
20 PINS
RθJA
Junction-to-ambient thermal resistance
96.0
116.1
79.8
51.5
77.1
102.8
35.1
RθJC(top)
Junction-to-case (top) thermal resistance
57.7
31.3
45.8
38.2
43.6
36.8
43.3
RθJB
Junction-to-board thermal resistance
51.2
57.6
47.4
32.4
44.6
53.8
12.9
ψJT
Junction-to-top characterization parameter
19.4
1.0
18.5
24.6
17.2
2.5
0.9
°C/W
Junction-to-board characterization
ψJB
50.8
56.9
47.0
32.3
44.2
53.3
12.9
parameter
Junction-to-case (bottom) thermal
RθJC(bot)
n/a
n/a
n/a
n/a
n/a
n/a
7.9
resistance
(1)
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report (SPRA953).
Copyright © 1995–2014, Texas Instruments Incorporated
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