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參數(shù)資料
| 型號(hào)： | 74AS245 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| 中文描述： | 八路總線收發(fā)器與三態(tài)輸出 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 515K |
| 代理商： | 74AS245 |
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SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272A
–
NOVEMBER 1994
–
REVISED JANUARY 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS245
MIN
TYP
SN74AS245
MIN
TYP
UNIT
MAX
–
1.2
MAX
–
1.2
VIK
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II =
–
18 mA
IOH =
–
2 mA
IOH =
–
3 mA
IOH =
–
12 mA
IOH =
–
15 mA
IOL = 48 mA
IOL = 64 mA
VI = 7 V
VI = 5.5 V
V
VCC
–
2
2.4
VCC
–
2
2.4
VOH
3.2
3.2
V
VCC = 4.5 V
2
2
VOL
VCC= 4 5 V
VCC = 4.5 V
0.3
0.55
V
0.35
0.55
II
Control inputs
VCC= 5 5 V
VCC = 5.5 V
0.1
0.1
mA
A or B ports
0.1
0.1
IIH
Control inputs
A or B ports
VCC= 5 5 V
VCC = 5.5 V,
VI= 2 7 V
VI = 2.7 V
50
20
μ
A
70
70
IIL
Control inputs
A or B ports
VCC= 5 5 V
VCC = 5.5 V,
VI= 0 4 V
VI = 0.4 V
–
0.5
–
0.5
mA
–
0.75
–
0.75
IO
§
VCC = 5.5 V,
VO = 2.25 V
Outputs high
–
50
–
150
–
50
–
150
mA
62
97
62
97
ICC
VCC = 5.5 V
Outputs low
95
143
95
143
mA
Outputs disabled
79
123
79
123
All typical values are VCC = 5 V, TA = 25
°
C.
For I/O ports, the parameters IIH and IIL include the off-state output current.
§
The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
,
R2 = 500
,
TA = MIN to MAX
SN54AS245
MIN
MAX
2
9.5
UNIT
SN74AS245
MIN
2
MAX
7.5
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
A or B
B or A
ns
2
9
2
7
OE
A or B
2
11
2
9
ns
2
10.5
2
8.5
OE
A or B
2
7.5
2
5.5
ns
2
12
2
9.5
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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