Texas Instruments SN65ALS1176D, SN65ALS1176DR, SN65ALS1176P Datasheet
SN65ALS1176
DIFFERENTIAL BUS TRANSCEIVER
SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
TIA/EIA-422-B, TIA/EIA-485-A, and ITU
Recommendations V.11 and X.27
D
Recommended for PROFIBUS Applications
D
Operates at Data Rates up to 35 MBaud
D
Operating Temperature Range
...–25°C to 85°C
D
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
D
Low Supply-Current Requirement
. . . 30 mA Max
D
Wide Positive and Negative Input/Output
Bus-Voltage Ranges
D
Thermal-Shutdown Protection
D
Driver Positive- and Negative-Current
Limiting
D
Receiver Input Hysteresis
D
Glitch-Free Power-Up and Power-Down
Protection
D
Receiver Open-Circuit Fail-Safe Design
D
Package Options Include Plastic
Small-Outline (D) Package and (P) DIPs
description
The SN65ALS1 176 dif ferential bus transceiver is designed for bidirectional data communication on multipoint
bus transmission lines. It is designed for balanced transmission lines and meets TIA/EIA-422-B, TIA/EIA-485-A,
and ITU Recommendations V.11 and X.27.
The SN65ALS1 176 combines a 3-state differential line driver and a differential input line receiver , both of which
operate from a single 5-V power supply. The driver and receiver have active-high and active-low enables,
respectively , that can be connected together externally to function as a direction control. The driver differential
outputs and the receiver differential inputs are connected internally to form a differential input/output (I/O) bus
port that is designed to offer minimum loading to the bus when the driver is disabled or VCC = 0. This port features
wide positive and negative common-mode voltage ranges, making the device suitable for party-line
applications.
The SN65ALS1176 is characterized for operation from –25°C to 85°C.
Copyright 1999, 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.
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.
1
2
3
4
8
7
6
5
R
RE
DE
D
V
CC
B
A
GND
D† OR P PACKAGE
(TOP VIEW)
†
The D package is available taped and
reeled. Add the suffix R to the device
type (e.g., SN65ALS1176DR).
SN65ALS1176
DIFFERENTIAL BUS TRANSCEIVER
SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Function Tables
DRIVERS
INPUT
ENABLE
OUTPUTS
D DE
A B
H H H L
L H L H
X L Z Z
RECEIVER
DIFFERENTIAL INPUTS ENABLE OUTPUT
A–B RE R
VID ≥ 0.2 V L H
–0.2 V < VID < 0.2 V L ?
VID ≤ –0.2 V L L
X H Z
Inputs open L H
H = high level, L = low level, X = irrelevant,
? = Indeterminate, Z = high impedance (off)
logic symbol
†
R
D
RE
DE
1
4
2
3
EN2
EN1
B
A
7
6
2
1
1
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram (positive logic)
Bus
B
7
A
6
1
R
2
RE
3
DE
4
D
SN65ALS1176
DIFFERENTIAL BUS TRANSCEIVER
SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
Driver Input: R
(eq)
= 3 kΩ NOM
Enable Inputs: R
(eq)
= 8 kΩ
NOM
R
(eq)
= equivalent resistor
TYPICAL OF A AND B I/O PORTS TYPICAL OF RECEIVER OUTPUT
Output
85 Ω
NOM
V
CC
180 kΩ
NOM
Connected
on B Port
1.1 kΩ
NOM
3 kΩ
NOM
18 kΩ
NOM
Connected
on A Port
180 kΩ
NOM
A or B
R
(eq)
V
CC
Input
V
CC
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P package 85°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°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.
NOTES: 1. All voltage values, except differential I/O bus voltage, are with respect to network ground terminal.
2. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
p
p
12
Input voltage at any bus terminal (separately or common mode), V
I
or V
IC
–7
V
High-level input voltage, V
IH
D, DE, and RE 2 V
Low-level input voltage, V
IL
D, DE, and RE 0.8 V
Differential input voltage, VID (see Note 3) ±12 V
p
Driver –60 mA
High-level output current, I
OH
Receiver –400 µA
p
Driver 60
Low-level output current, I
OL
Receiver 8
mA
Operating free-air temperature, T
A
–25 85 °C
NOTE 3: Differential input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
SN65ALS1176
DIFFERENTIAL BUS TRANSCEIVER
SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS
†
MIN TYP
‡
MAX UNIT
V
IK
Input clamp voltage II = –18 mA –1.5 V
V
O
Output voltage IO = 0 0 6 V
|V
OD1
| Differential output voltage IO = 0 1.5 6 V
p
RL = 100 Ω, See Figure 1
1/2VOD 1 or 2
§
V
|V
OD2
|
Differential output voltage
RL = 54 Ω, See Figure 1 2.1 2.5 5 V
V
OD3
Differential output voltage V
test
= –7 V to 12 V, See Figure 2 1.5 5 V
∆ |VOD|
Change in magnitude of differential
output voltage
¶
±0.2 V
p
3
VOCCommon-mode output voltage
R
L
= 54 Ω or
100 Ω
,
See Figure 1
–1
V
∆ |VOC|
Change in magnitude of common-mode
output voltage
¶
±0.2 V
p
Outputs disabled,
VO = 12 V 1
IOOutput current
,
See Note 4
VO = –7 V –0.8
mA
I
IH
High-level input current VI = 2.4 V 20 µA
I
IL
Low-level input current VI = 0.4 V –400 µA
VO = –4 V –250
p
VO = 0 –150
IOSShort-circuit output current
#
VO = V
CC
250
mA
VO = 8 V 250
pp
Outputs enabled 23 30
ICCSupply current
No load
Outputs disabled 19 26
mA
†
The power-off measurement in TIA/EIA-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 V
OD2
with a 100-Ω load is either 1/2 V
OD1
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 one logic state to
the other.
#
Duration of the short circuit should not exceed one second for this test.
NOTE 4: This applies for both power on and power off; refer to TIA/EIA-485-A for exact conditions. The TIA/EIA-422-B limit does not apply for
a combined driver and receiver terminal.
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