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| 型號： | 7LB176 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DIFFERENTIAL BUS TRANSCEIVERS |
| 中文描述： | 差分總線收發(fā)器 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 440K |
| 代理商： | 7LB176 |
SLLS067G AUGUST 1990 REVISED APRIL 2006
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIT+
Positive-going input threshold
voltage
VO = 2.7 V,
IO = 0.4 mA
0.2
V
VIT
Negative-going input threshold
voltage
VO = 0.5 V,
IO = 8 mA
0.2
V
Vhys
Hysteresis voltage (VIT+ VIT)
(see Figure 4)
50
mV
VIK
Enable-input clamp voltage
II = 18 mA
VID = 200 mV,
See Figure 6
1.5
V
VOH
High-level output voltage
IOH = 400
μ
A,
2.7
V
VOL
Low-level output voltage
VID = 200 mV,
See Figure 6
IOL = 8 mA,
0.45
V
IOZ
High-impedance-state output
current
VO = 0.4 V to 2.4 V
20
20
μ
A
II
Line input current
Other input = 0 V,
See Note 5
VI = 12 V
VI = 7 V
1
mA
0.8
IIH
IIL
rI
High-level enable-input current
VIH = 2.7 V
VIL = 0.4 V
100
μ
A
μ
A
k
Low-level enable-input current
100
Input resistance
12
Receiver enabled
and driver disabled
3.9
mA
ICC
Supply current
VI = 0 or VCC,
No load
Receiver and
driver disabled
SN55LBC176,
SN65LBC176,
SN65LBC176Q
0.25
mA
SN75LBC176
0.2
All typical values are at VCC = 5 V, TA = 25
°
C.
The algebraic convention, in which the less-positive (more-negative) limit is designated minimum, is used in this data sheet.
NOTE 5: This applies for both power on and power off. Refer to ANSI Standard RS-485 for exact conditions.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 15 pF
PARAMETER
TEST CONDITIONS
SN55LBC176
SN65LBC176Q
SN65LBC176
SN75LBC176
TYP
UNIT
MIN
MAX
MIN
MAX
tPLH
Propagation delay time, low- to high-level
single-ended output
VID = 1.5 V to 1.5 V,
See Figure 7
11
37
11
33
ns
tPHL
Propagation delay time, high- to low-level
single-ended output
11
37
11
33
ns
tsk(p)
tPZH
tPZL
tPHZ
tPLZ
All typical values are at VCC = 5 V, TA = 25
°
C.
Pulse skew (| tPLH tPHL|)
Output enable time to high level
10
3
6
ns
See Figure 8
35
35
ns
Output enable time to low level
35
30
ns
Output disable time from high level
Output disable time from low level
See Figure 8
35
35
35
30
ns
ns
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