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SN75ALS171AJ Datasheet(PDF) 7 Page - Texas Instruments

Part # SN75ALS171AJ
Description  TRIPLE DIFFERENTIAL BUS TRANSCEIVERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN75ALS171AJ Datasheet(HTML) 7 Page - Texas Instruments

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SN75ALS171, SN75ALS171A
TRIPLE DIFFERENTIAL BUS TRANSCEIVERS
SLLS056D – AUGUST 1987 – REVISED SEPTEMBER 1995
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
0.3
V
VIT –
Negative-going input threshold voltage
VO = 0.5 V,
IO = 8 mA
– 0.3 ‡
V
Vhys
Hysteresis voltage (VIT + – VIT –)
60
mV
VIK
Enable-input clamp voltage
II = – 18 mA
– 1.5
V
VOH
High-level output voltage
VID = 300 mV,
See Figure 8
IOH = – 400 µA,
2.7
V
VOL
Low-level output voltage
VID = – 300 mV,
See Figure 8
IOL = 8 mA,
0.45
V
IOZ
High-impedance-state output current
VO = 0.4 V to 2.4 V
±20
µA
II
Line input current
Other input = 0 V,
VI = 12 V
1
mA
II
Line input current
,
See Note 4
VI = – 7 V
– 0.8
mA
IIH
High-level enable-input current
VIH = 2.7 V
60
µA
IIL
Low-level enable-input current
VIL = 0.4 V
– 300
µA
ri
Input resistance
12
k
IOS
Short-circuit output current
VID = 300 mV,
VO = 0
–15
–85
mA
ICC
Supply current
No load
Outputs enabled
69
90
mA
ICC
Supply current
No load
Outputs disabled
57
78
mA
† All typical values are at VCC = 5 V and TA = 25°C.
‡ The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet for common-mode
input voltage and threshold voltage levels only.
NOTE 4: This applies for both power on and off; refer to EIA Standard RS-485 for exact conditions.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature range
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
UNIT
tPLH
Propagation delay time low to high level output
ALS171
VID = – 1 5Vto1 5V
9
19
ns
tPLH
Propagation delay time, low- to high-level output
ALS171A
VID = –1.5 V to 1.5 V,
CL = 15 pF,
11
16
ns
tPHL
Propagation delay time high to low level output
ALS171
L
,
TA = 25°C,
SFi
9
9
19
ns
tPHL
Propagation delay time, high- to low-level output
ALS171A
See Figure 9
11
16
ns
tsk(p)
Pulse skew§
VID = – 1.5 V to 1.5 V,
2
5
ns
t k(li )
Ske
limit¶
ALS171
VID
1.5 V to 1.5 V,
CL = 15 pF,
10
ns
tsk(lim)
Skew limit¶
ALS171A
See Figure 9
5
ns
tPZH
Output enable time to high level
CL = 15 pF,
7
14
ns
tPZL
Output enable time to low level
L
,
See Figure 10
7
14
ns
tPHZ
Output disable time from high level
CL = 15 pF,
20
35
ns
tPLZ
Output disable time from low level
L
See Figure 10
8
17
ns
† All typical values are at VCC = 5 V and TA = 25°C.
§ Pulse skew is defined as the | tPLH–tPHL| of each channel.
¶ Skew limit is the maximum difference in propagation delay times between any two channels of one device and between any two devices. This
parameter is applicable at one VCC and operating temperature within the recommended operating conditions.


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