|
|
Part: SN75178BPSR
Category:
Interface and Interconnect
-> RS-485
Description: ti SN75178B, Differential Bus Repeaters
Company: Texas Instruments, Inc.
Datasheet: Download SN75178BPSR datasheet File size : 255 kB
Request For quote: Find where to buy SN75178BPSR
Datasheet text preview:
SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS
SLLS002C D2606, JULY 1985 REVISED FEBRUARY 1993
· · · · · · · · · · · ·
Meets EIA Standards RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Outputs Bus Voltage Range . . . 7 V to 12 V Positive and Negative Current Limiting Driver Output Capability . . . 60 mA Max Driver Thermal Shutdown Protection Receiver Input Impedance . . . 12 k Min Receiver Input Sensitivity . . . ± 200 mV Receiver Input Hysteresis . . . 50 mV Typ Operates From Single 5-V Supply Low Power Requirements
SN75177B . . . D OR P PACKAGE (TOP VIEW)
VCC T EN GND
1 2 3 4
8 7 6 5
A B Z Y
SN75178B . . . P PACKAGE (TOP VIEW)
VC C T EN GND
1 2 3 4
8 7 6 5
A B Z Y
description
THE SN75177B IS NOT RECOMMENDED FOR NEW DESIGN
The SN75177B and SN75178B differential bus repeaters are monolithic integrated devices each designed for one-way data communication on multipoint bus transmission lines. These devices are designed for balanced transmission bus line applications and meet EIA Standard RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27. Each device is designed to improve the performance of the data communication over long bus lines. The SN75177B and SN75178B are identical except for the complementary enable inputs, which allow the devices to be used in pairs for bidirectional communication. The SN75177B and SN75178B feature positive- and negative-current limiting 3-state outputs for the receiver and driver. The receiver features high input impedance, input hysteresis for increased noise immunity, and input sensitivity of ± 200 mV over a common-mode input voltage range of 7 V to 12 V. The driver features thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C. The driver is designed to drive current loads up to 60 mA maximum. The SN75177B and SN75178B are designed for optimum performance when used on transmission buses employing the SN75172 and SN75174 differential line drivers, SN75173 and SN75175 differential line receivers, or SN75176B bus transceiver. Function Tables
SN75177B DIFFERENTIAL INPUTS AB VID 0.2 V 0.2 V < VID < 0.2 V VID 0.2 V X ENABLE EN H H H L SN75178B DIFFERENTIAL INPUTS AB VID 0.2 V 0.2 V < VID < 0.2 V VID 0.2 V X ENABLE EN L L L H T H ? L Z OUTPUTS Y H ? L Z Z L ? H Z T H ? L Z OUTPUTS Y H ? L Z Z L ? H Z
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = impedance (off)
Copyright © 1993, 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
21
SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS
SLLS002C D2606, JULY 1985 REVISED FEBRUARY 1993
logic symbols
SN75177B EN A B T 3 8 7 2
logic diagrams (positive logic)
SN75177B EN 3 8 7 2 Receiver Driver 5 6 Y Z
EN
5 6
A Y Z T B
SN75178B EN A B T 3 8 7 2 EN EN 5 6 A Y Z T B
SN75178B 3 8 7 2 Receiver Driver 5 6 Y Z
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT VCC Req TYPICAL OF ALL DRIVER OUTPUTS VCC
Input Output
Driver input: Req = 3 k NOM Enable inputs: Req = 8 k NOM EQUIVALENT OF EACH RECEIVER INPUT VCC
GND
TYPICAL OF RECEIVER OUTPUT VCC
85 NOM 960 NOM 16.8 k 960 NOM NOM
Input
Output
22
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS
SLLS002C D2606, JULY 1985 REVISED FEBRUARY 1993
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 15 V Differential input voltage (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 V Enable input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
NOTES: 1. All voltage values, except differential input voltage, are with respect to network ground terminal. 2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting input. DISSIPATION RATING TABLE PACKAGE D P TA 25°C POWER RATING 725 mW 1000 mW DERATING FACTOR ABOVE TA = 25°C 5.8 mW/°C 8.0 mW/°C TA = 70°C POWER RATING 464 mW 640 mW
recommended operating conditions
MIN Supply voltage, VCC High-level input voltage, VIH low-level input voltage, VIL Common-mode input voltage, VIC Differential input voltage, VID High-level output current, IOH output current Low-level output current, IOL output current Driver Receiver Driver Receiver EN or EN EN or EN 7 4.75 2 0.8 12 ± 12 60 400 60 8 NOM 5 MAX 5.25 UNIT V V V V V mA µA mA
Operating free-air temperature, TA 0 70 °C The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input voltage and threshold voltage.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
23
Others parts begin by sn
SN-1 SN-2 SN-3 SN-4 SN-5 SN-6 SN-7 SN-8 SN-9 SN-10 SN-11 SN-12 SN-13 SN-14 SN-15 SN-16 SN-17 SN-18 SN-19 SN-20 SN-21 SN-22 SN-23 SN-24 SN-25 SN-26 SN-27 SN-28 SN-29 SN-30 SN-31 SN-32 SN-33 SN-34 SN-35 SN-36 SN-37 SN-38 SN-39 SN-40 SN-41 SN-42 SN-43 SN-44 SN-45 SN-46 SN-47 SN-48 SN-49 SN-50 SN-51 SN-52 SN-53 SN-54 SN-55 SN-56 SN-57 SN-58 SN-59 SN-60 SN-61 SN-62 SN-63 SN-64 SN-65 SN-66 SN-67 SN-68 SN-69 SN-70 SN-71 SN-72 SN-73 SN-74 SN-75 SN-76 SN-77 SN-78 SN-79 SN-80 SN-81 SN-82 SN-83 SN-84 SN-85 SN-86 SN-87 SN-88 SN-89 SN-90 SN-91 SN-92 SN-93 SN-94 SN-95 SN-96 SN-97 SN-98 SN-99 SN-100 SN-101 SN-102 SN-103 SN-104 SN-105 SN-106 SN-107 SN-108 SN-109 SN-110 SN-111 SN-112 SN-113 SN-114 SN-115 SN-116 SN-117 SN-118 SN-119 SN-120 SN-121
|
|
|
