TI SN75ALS170ADW

SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
DW PACKAGE
(TOP VIEW)
Three Bidirectional Transceivers
Driver Meets or Exceeds ANSI Standard
EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11
Two Skew Limits Available
Designed to Operate Up to 20 Million Data
Transfers per Second (FAST-20 SCSI)
High-Speed Advanced Low-Power Schottky
Circuitry
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
Wide Positive and Negative Input/Output
Bus Voltage Ranges
Driver Output Capacity . . . ± 60 mA
Thermal Shutdown Protection
Driver Positive- and Negative-Current
Limiting
Receiver Input Impedances . . . 12 kΩ Min
Receiver Input Sensitivity . . . ± 300 mV Max
Receiver Input Hysteresis . . . 60 mV Typ
Operate From a Single 5-V Supply
Glitch-Free Power-Up and Power-Down
Protection
Feature Independent Direction Controls for
Each Channel
1D
1DIR
NC
GND
NC
2D
2DIR
NC
3D
3DIR
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
1B
1A
NC
NC
VCC
2B
2A
3B
3A
NC
NC – No internal connection
J PACKAGE
(TOP VIEW)
1D
1DIR
GND
2D
2DIR
3D
3DIR
1
14
2
13
3
12
4
11
5
10
6
9
7
8
1B
1A
VCC
2B
2A
3B
3A
description
The SN75ALS170 and SN75ALS170A triple differential bus transceivers are monolithic integrated circuits
designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced
transmission lines and the driver meets ANSI Standards EIA/TIA-422-B and RS-485 and both the driver and
receiver meet ITU Recommendation V.11. The SN75ALS170A is designed for FAST-20 SCSI and can transmit
or receive data pulses as short as 30 ns with a maximum skew of 5 ns.
The SN75ALS170 and SN75ALS170A operate from a single 5-V power supply. The drivers and receivers have
active-high and active-low enables, respectively, which are internally connected together to function as a
direction control. The driver differential outputs and the receiver differential inputs are connected internally to
form differential input/output (I/O) bus ports that are designed to offer minimum loading to the bus when the
driver is disabled or VCC = 0. These ports feature wide positive and negative common-mode voltage ranges
making the device suitable for party-line applications.
The SN75ALS170 and the SN75ALS170A are characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS
SKEW LIMIT
10 ns
5 ns
PART NUMBER
SN75ALS170DW
SN75ALS170J
SN75ALS170ADW
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright  1995, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
Function Tables
EACH DRIVER
OUTPUTS
INPUT
D
DIR
H
H
H
L
L
H
L
H
X
L
Z
Z
A
B
EACH RECEIVER
DIR
OUTPUT
R
VID ≥ 0.3 V
– 0.3 V < VID < 0.3 V
L
H
L
?
VID ≤ – 0.3 V
X
L
L
H
Z
Open
L
H
DIFFERENTIAL INPUTS
A–B
H = high level, L = low level, ? = indeterminate,
X = irrelevant, Z = high impedance (off)
logic symbol†
1DIR
1D
2
1
logic diagram (positive logic)
EN
2DIR
2D
7
6
3D
10
9
20
14
15
1B
1DIR
1D
2A
2B
2DIR
2D
1
12
EN
EN
1A
13
1
19
20
1A
1B
7
6
14
15
2A
2B
3A
3B
1
3DIR
3D
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Pin numbers shown are for the DW package.
2
2
1
EN
EN
3DIR
19
EN
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• DALLAS, TEXAS 75265
10
9
12
13
3A
3B
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
VCC
TYPICAL OF A AND B I/O PORTS
TYPICAL OF RECEIVER OUTPUT
VCC
R(eq)
180 kΩ
NOM
Connected
on A Port
Input
85 Ω
NOM
3 kΩ
NOM
A or B
18 kΩ
NOM
180 kΩ
NOM
Connected
on B Port
Driver Input: R(eq) = 12 kΩ NOM
Enable Inputs: R(eq) = 8 kΩ NOM
R(eq) = equivalent resistor
VCC
Output
1.1 kΩ
NOM
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 7 V to 12 V
Enable input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: DW package . . . . . . . . . . . . . . . . . . 260°C
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . . . . . . . . . . . . . . . 300°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values, except differential I/O bus voltage, are with respect to network ground terminal.
DISSIPATION RATING TABLE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
DW
1125 mW
9.0 mW/°C
720 mW
J
1025 mW
8.2 mW/°C
656 mW
PACKAGE
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
recommended operating conditions
Supply voltage, VCC
MIN
TYP
MAX
UNIT
4.75
5
5.25
V
12
mode) VI or VIC
Voltage at any bus terminal (separately or common mode),
High-level input voltage, VIH
D, DIR
Low-level input voltage, VIL
D, DIR
–7
2
Differential input voltage, VID (see Note 2)
High level output current,
High-level
current IOH
Low level output current,
Low-level
current IOL
Driver
Receiver
Driver
V
0.8
V
±12
V
– 60
mA
– 400
µA
60
Receiver
8
Operating free-air temperature, TA
0
70
NOTE 2: Differential-input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
V
mA
°C
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
TEST CONDITIONS†
PARAMETER
VIK
VO
Input clamp voltage
II = – 19 mA
IO = 0
Output voltage
VOH
High-level
output
High
level out
ut voltage
VCC = 4
4.75
75 V
V,
VIL = 0
0.8
8V
V,
VOL
Low-level output voltage
VCC = 4.75 V,
VIL = 0.8 V,
| VOD1 |
Differential output voltage
IO = 0
| VOD2 |
g
Differential output voltage
VOD3
Differential output voltage
∆ | VOD |
Change in magnitude of differential output
voltage¶
VOC
Common mode output voltage
Common-mode
∆ | VOC |
Change in magnitude of common-mode
output voltage¶
IO
Output current
IIH
IIL
High-level input current
IOS
ICC
Low-level input current
Short circuit output current
Short-circuit
Supply current
MIN
TYP‡
0
VIH = 2 V
V,
IOH = – 55 mA
VIH = 2 V,
IOL = 55 mA
UNIT
– 1.5
V
6
V
2.7
V
1.5
RL = 100 Ω,
See Figure 1
1/2 VOD1
or 2§
RL = 54 Ω,
See Figure 1
1.5
Vtest = – 7 V to 12 V,
See Figure 2
1.5
RL = 540 Ω or 100 Ω
Ω,
MAX
1.7
V
6
V
V
2.5
5
V
5
V
± 0.2
V
3
See Figure 1
–1
± 0.2
Output disabled,,
See Note 3
VO = 12 V
VO = –7 V
1
– 0.8
VI = 2.4 V
VI = 0.4 V
V
mA
20
µA
– 400
µA
VO = – 6 V
VO = 0
– 250
VO = VCC
VO = 8 V
250
No load
V
– 150
mA
250
Outputs enabled
69
90
Outputs disabled
57
78
mA
† The power-off measurement in ANSI Standard EIA/TIA-422-B applies to disabled outputs only and is not applied to combined inputs and outputs.
‡ All typical values are at VCC = 5 V and TA = 25°C.
§ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2 V, whichever is greater.
¶ ∆ | VOD | and ∆ | VOC | are the changes in magnitude of VOD and VOC respectively, that occur when the input is changed from a high level to a
low level.
NOTE 3: This applies for both power on and off; refer to EIA Standard RS-485 for exact conditions. The EIA/TIA-422-B limit does not apply for
a combined driver and receiver terminal.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
ALS170
ALS170A
td(OD)
Differential output delay time
ALS170
ALS170A
tsk(p)
k( )
Pulse skew‡
ALS170
tsk(lim)
k(li )
ALS170A
Skew limit§
ALS170
ALS170A
tt(OD)
Differential output transition time
Differential-output
TYP†
MAX
3
8
13
5.5
8
10.5
3
8
13
5.5
8
10.5
1
5
ns
1
5
ns
MIN
RL = 54 Ω,,
TA =25°C,
CL = 50 pF,,
See Figure 3
RL1 = RL3 = 165 Ω,
CL = 60 pF,
pF
See Figure 4
RL2 = 75 Ω,
TA =25°C,
=25°C
RL = 54 Ω,
See Figure 3
CL = 50 pF,
RL1 = RL3 = 165 Ω,
CL = 60 pF,
RL2 = 75 Ω,
See Figure 4
RL = 54 Ω,,
See Figure 3
CL = 50 pF,,
RL1 = RL3 = 165 Ω,,
CL = 60 pF,
RL2 = 75 Ω,,
See Figure 4
RL = 54 Ω,
See Figure 3
CL = 50 pF,
RL1 = RL3 = 165 Ω,
CL = 60 pF,
RL2 = 75 Ω,
See Figure 4
UNIT
ns
10
5
10
ns
5
3
8
13
3
8
13
ns
† All typical values are at VCC = 5 V and TA = 25°C.
‡ Pulse skew is defined as the | td(ODH) – t d(ODL) | 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.
SYMBOL EQUIVALENTS
6
DATA SHEET PARAMETER
EIA/TIA-422-B
RS-485
VO
| VOD1 |
Voa, Vob
VO
Voa, Vob
VO
| VOD2 |
Vt (RL = 100 Ω)
| VOD3 |
Vt (RL = 54 Ω)
Vt (Test Termination
Measurement 2)
Vtest
∆ | VOD |
| | Vt | – | Vt | |
Vtst
| | Vt | – | Vt | |
VOC
∆ | VOC |
| Vos |
| Vos – Vos |
| Vos |
| Vos – Vos |
IOS
IO
| Isa |, | Isb |
| Ixa |, | Ixb |
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
Iia, Iib
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER
VIT +
VIT –
Positive-going input threshold voltage
Vhys
VIK
Hysteresis voltage (VIT + – VIT –)
TEST CONDITIONS
Negative-going input threshold voltage
VO = 2.7 V,
VO = 0.5 V,
IO = – 0.4 mA
IO = 8 mA
TYP†
MAX
0.3
– 0.3 ‡
Enable-input clamp voltage
II = – 18 mA
VID = 300 mV,
See Figure 5
IOH = – 400 µA,
IOL = 8 mA,
High-level output voltage
VOL
Low-level output voltage
VID = – 300 mV,
See Figure 5
IOZ
High impedance state output current
High-impedance-state
VO = 2.4 V
VO = 0.4 V
II
Line input current
Other input = 0,,
See Note 4
IIH
IIL
High-level enable-input current
rI
Input resistance
IOS
Short-circuit output current
2.7
0.45
20
VI = 12 V
VI = – 7 V
1
– 0.8
20
– 100
12
Supply current
No load
VO = 0
Outputs enabled
V
µA
mA
µA
µA
kΩ
– 15
Outputs disabled
V
V
– 400
VID = 300 mV,
V
mV
– 1.5
VIH = 2.7 V
VIL = 0.4 V
Low-level enable-input current
UNIT
V
60
VOH
ICC
MIN
– 85
69
90
57
78
mA
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
tPLH
Propagation
delay
g
y time,, low-to-high-level
g
output
ALS170
tPHL
Propagation
g
delay
y time,, high-to-low-level
g
output
ALS170
tsk(p)
k( )
Pulse skew§
tsk(lim)
Skew limit¶
ALS170A
VID = – 1.5 V to 1.5 V,
CL = 15 pF,
TA = 25°C
25°C,
pF
See Figure 6
ALS170A
ALS170
ALS170A
ALS170
MIN
TYP†
9
19
11.5
16.5
9
19
11.5
16.5
2
VID = – 1.5 V to 1.5 V,,
CL = 15 pF,
See Figure 6
ALS170A
MAX
UNIT
ns
ns
6
5
10
ns
ns
5
† All typical values are at VCC = 5 V and TA = 25°C.
§ Pulse skew is defined as the | tPLH – t PHL| 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
PARAMETER MEASUREMENT INFORMATION
RL
2
VOD2
RL
2
VOC
Figure 1. Driver VOD and VOC
375 Ω
VOD3
60 Ω
Vtest
375 Ω
Figure 2. Driver VOD3
3V
RL = 54 Ω
Generator
(see Note A)
CL= 50 pF
(see Note B)
50 Ω
Output
1.5 V
Input
1.5 V
0V
td(ODH)
td(ODL)
≈ 2.5 V
90% 90%
Output
3V
50%
10%
50%
10%
tt(OD)
TEST CIRCUIT
≈ – 2.5 V
tt(OD)
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,
ZO = 50 Ω.
B. CL includes probe and jig capacitance.
Figure 3. Driver Test Circuit and Voltage Waveforms
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
PARAMETER MEASUREMENT INFORMATION
S1
5V
0V
CL = 60 pF
(see Note B)
RL1 = 165 Ω
RL 2 = 75 Ω
Generator
(see Note A)
Output
50 Ω
3V
CL = 60 pF
(see Note B)
RL3 = 165 Ω
5V
0V
S2
TEST CIRCUIT
3V
Input
1.5 V
1.5 V
Input
0V
td(ODL)
td(ODH)
Output
3V
S1 to 5 V
S2 to 0 V
0V
10%
90% 90%
1.5 V
0V
td(ODL)
td(ODH)
≈ 2.9 V
0V
10%
≈ – 2.9 V
tt(OD)
tt(OD)
0V
10%
Output
S1 to 0 V
S2 to 5 V
1.5 V
90% 90%
≈ 2.3 V
0V
10%
≈ – 2.9 V
tt(OD)
tt(OD)
VOLTAGE WAVEFORMS
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,
ZO = 50 Ω.
B. CL includes probe and jig capacitance.
Figure 4. Driver Test Circuit and Voltage Waveforms With Double-Differential-SCSI
Termination for the Load
VID
VOH
+ IOL
VOL
– IOH
Figure 5. Receiver VOH and VOL
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• DALLAS, TEXAS 75265
9
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
PARAMETER MEASUREMENT INFORMATION
3V
Generator
(see Note A)
Input
Output
1.5 V
1.5 V
51 Ω
0V
1.5 V
tPLH
CL = 15 pF
(see Note B)
tPHL
VOH
0V
1.3 V
Output
1.3 V
VOL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,
ZO = 50 Ω.
B. CL includes probe and jig capacitance.
Figure 6. Receiver Test Circuit and Voltage Waveforms
TYPICAL CHARACTERISTICS
DRIVER
DRIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
5
5
VCC = 5 V
TA = 25°C
VCC = 5 V
TA = 25°C
4.5
VOL – Low-Level Output Voltage – V
VOH – High-Level Output Voltage – V
4.5
4
3.5
3
2.5
2
1.5
1
0.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
0
– 80
– 100
– 20
– 40
– 60
IOH – High-Level Output Current – mA
– 120
0
80
100
20
40
60
IOL – Low-Level Output Current – mA
Figure 7
10
Figure 8
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120
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
TYPICAL CHARACTERISTICS
DRIVER
RECEIVER
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
5
VCC = 5 V
TA = 25°C
3.5
VOH – High-Level Output Voltage – V
VOD – Differential Output Voltage – V
4
3
2.5
2
1.5
1
VID = 0.3 V
TA = 25°C
4
3
VCC = 5.25 V
VCC = 5 V
2
VCC = 4.75 V
1
0.5
0
0
0
10
20
30 40 50 60 70 80
IO – Output Current – mA
90
100
0
– 40
– 10
– 20
– 30
IOH – High-Level Output Current – mA
Figure 9
Figure 10
RECEIVER
RECEIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
0.6
VCC = 5 V
VID = 300 mV
IOH = – 440 µA
VOL– Low-Level Output Voltage – V
VOH – High-Level Output Voltage – V
5
4
– 50
3
2
1
0
– 40
VCC = 5 V
TA = 25°C
VID = – 300 mV
0.5
0.4
0.3
0.2
0.1
– 20
0
20
40
60
80
TA – Free-Air Temperature – °C
100
120
0
0
15
20
25
5
10
IOL – Low-Level Output Current – mA
Figure 11
30
Figure 12
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• DALLAS, TEXAS 75265
11
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
TYPICAL CHARACTERISTICS
RECEIVER
RECEIVER
OUTPUT VOLTAGE
vs
ENABLE VOLTAGE
LOW-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
5
0.5
VCC = 5 V
VID = – 300 mA
IOL = 8 mA
VID = 0.3 V
Load = 8 kΩ to GND
TA = 25°C
VCC = 5.25 V
4
VO – Output Voltage – V
VOL – Low-Level Output Voltage – V
0.6
0.4
0.3
0.2
VCC = 4.75 V
3
VCC = 5 V
2
1
0.1
0
– 40
0
– 20
0
20
40
60
80
100
TA – Free-Air Temperature – °C
0
120
0.5
1
Figure 13
Figure 14
RECEIVER
OUTPUT VOLTAGE
vs
ENABLE VOLTAGE
6
VID = 0.3 V
Load = 1 kΩ to VCC
TA = 25°C
VO – Output Voltage – V
5
VCC = 5.25 V
VCC = 4.75 V
4
VCC = 5 V
3
2
1
0
0
0.5
1
1.5
2
VI – Enable Voltage – V
2.5
Figure 15
12
1.5
2
VI – Enable Voltage – V
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
2.5
3
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
APPLICATION INFORMATION
1/3 SN75ALS170
1/3 SN75ALS170
See Note A
Up to 32
Transceivers
• • •
NOTE A: The line should be terminated at both ends in its characteristic impedance. Stub lengths off the main line should be kept as short as
possible.
Figure 16. Typical Application Circuit
4 V to 5.25 V
4 V to 5.25 V
330 Ω
330 Ω
150 Ω
150 Ω
330 Ω
330 Ω
Up to 16
Transceivers
• • •
Figure 17. Typical Differential SCSI Application Circuit
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
13
SN75ALS170, SN75ALS170A
TRIPLE DIFFERENTIAL BUS TRANSCEIVER
SLLS055D – AUGUST 1987 – REVISED SEPTEMBER 1995
APPLICATION INFORMATION
1
2
4
5
9
10
12
13
VCC
1 BIN/OCT
2
3
6
4
5
15
14
13
12
11
10
9
7
&
&
2
1
8
EN
5
4
&
3
EN
7
6
6
2
1
EN
5
4
2
4
6
8
10
12
1
SN74LS04
7
6
EN
EN
EN
1
8
9
EN
5
4
10
DB(0)
11
–DB(0)
1
8
9
EN
10
ATN
11
–ATN
1
8
9
EN
5
4
EN
10
I/O
11
–I/O
1
8
9
EN
VCC
17
2
7
10
18
EN
1
19
BSY
20
–BSY
1
14
SEL
15
–SEL
8
6
1
12
RST
13
–RST
11
To Reset Logic
9
1
SN75ALS171
Figure 18. Typical Differential SCSI Bus Interface Implementation
14
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
REQ
–REQ
SN75ALS170
G5
5EN1
5EN2
5EN3
EN4
3
1
13
C/D
14
–C/D
1
EN
7
6
MSG
–MSG
1
SN75ALS170
EN
2
1
13
ACK
14
–ACK
1
EN
EN
DB(P)
–DB(P)
1
EN
7
6
13
DB(1)
14
–DB(1)
1
SN75ALS170
EN
2
1
DB(2)
–DB(2)
1
EN
EN
To SCSI Bus
Controller
10
DB(3)
11
–DB(3)
EN
7
6
13
DB(4)
14
–DB(4)
1
SN75ALS170
EN
2
1
DB(5)
–DB(5)
1
EN
5
4
SB7
SB6
SB5
SB4
SB3
SB2
SB1
SB0
SBP
INIT
ACK
ATN
TARGET
MSG
C/D
I/O
REQ
BSYOUT
BSYIN
SELOUT
SELIN
SBEN
ARB
8
9
EN
EN
1
3
5
9
11
13
1
SN75ALS170
EN
11
SN74LS00
10
DB(6)
11
–DB(6)
EN
EN
8
1
EN
11
1
2
4
5
9
10
12
13
13
DB(7)
14
–DB(7)
EN
6
SN74LS00
SN74LS138
ID0
ID1
ID2
3
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