參數(shù)資料
型號： SN54LS245FK
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
文件頁數(shù)： 4/15頁
文件大?。?/td> 513K
代理商： SN54LS245FK
SN54LS245, SN74LS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDLS146A
–
OCTOBER 1976
–
REVISED FEBRUARY 2002
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54LS245
TYP
2
SN74LS245
TYP
2
UNIT
MIN
MAX
MIN
MAX
VIH
VIL
VIK
High-level input voltage
V
Low-level input voltage
0.7
0.8
V
Input clamp voltage
VCC = MIN,
VCC = MIN
VCC = MIN,
VIH = 2 V,
VIL = VIL(max)
VCC = MIN,
VIH = 2 V,
VIL = VIL(max)
VCC = MAX,
OE at 2 V
II =
–
18 mA
–
1.5
–
1.5
V
Hysteresis (VT+
–
VT
–
)
A or B
0.2
0.4
0.2
0.4
V
VOH
High level output voltage
High-level output voltage
IOH =
–
3 mA
2.4
3.4
2.4
3.4
V
IOH = MAX
2
2
VOL
Low level output voltage
Low-level output voltage
IOL = 12 mA
0.4
0.4
V
IOL = 24 mA
0.5
IOZH
Off-state output current,
high-level voltage applied
VO = 2.7 V
20
20
μ
A
IOZL
Off-state output current,
low-level voltage applied
VCC = MAX,
OE at 2 V
VO = 0.4 V
–
200
–
200
μ
A
II
Input current at
maximum input
voltage
A or B
VCC= MAX
VCC = MAX
VI = 5.5 V
0.1
0.1
mA
DIR or OE
VI = 7 V
0.1
0.1
IIH
IIL
IOS
High-level input current
VCC = MAX,
VCC = MAX,
VCC = MAX
VIH = 2.7 V
VIL = 0.4 V
20
20
μ
A
mA
Low-level input current
Short-circuit output current
§
–
0.2
–
0.2
–
40
–
225
40
–
225
mA
Total, outputs high
48
70
48
70
ICC
Supply current
Total, outputs low
VCC = MAX
Outputs open
62
90
62
90
mA
Outputs at high Z
64
95
64
95
For conditions shown as MIN or MAX, use the appropriate values specified under recommended operating conditions.
All typical values are at VCC = 5 V, TA = 25
°
C.
§
Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second.
switching characteristics, V
CC
= 5 V, T
A
= 25
°
C (see Figure 1)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
Propagation delay time, low- to high-level output
CL = 45 pF,
RL = 667
8
12
ns
Propagation delay time high to low level output
Propagation delay time, high- to low-level output
8
12
Output enable time to low level
CL= 45 pF
CL = 45 pF,
RL= 667
RL = 667
27
40
ns
Output enable time to high level
25
40
Output disable time from low level
Output disable time from high level
CL= 5 pF
CL = 5 pF,
RL= 667
RL = 667
15
15
25
28
ns
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