Datasheet

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SN75ALS1177, SN75ALS1178

DUAL DIFFERENTIAL DRIVERS AND RECEIVERS

SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Meet or Exceed Standards TIA/EIA-422-B

and TIA/EIA-485-A

Designed for Multipoint Bus Transmission

on Long Bus Lines in Noisy Environments

Low Supply-Current Requirement

50 mA Max

Driver Positive- and Negative-Current

Limiting

Driver Common-Mode Output Voltage

Range of –7 V to 12 V

Thermal Shutdown Protection

Driver 3-State Outputs Active-High Enable

Receiver Common-Mode Input Voltage

Range of –12 V to 12 V

Receiver Input Sensitivity . . . ±200 mV

Receiver Hysteresis . . . 50 mV Typ

Receiver High Input

Impedance ...12kΩ Min

Receiver 3-State Outputs Active-Low

Enable for SN75ALS1177 Only

Operate From Single 5-V Supply

description

The SN75ALS1177 and SN75ALS1178 dual differential drivers and receivers are integrated circuits designed

for bidirectional data communication on multipoint bus transmission lines. They are designed for balanced

transmission lines and meet standards TIA/EIA-422-B and TIA/EIA-485-A.

The SN75ALS1177 combines dual 3-state differential line drivers and dual 3-state differential input line

receivers, both of which operate from a single 5-V power supply. The drivers and receivers have active-high

and active-low enables, respectively, which can be externally connected together to function as direction

control. The SN75ALS1178 drivers each have an individual active-high enable. Fail-safe design ensures that

when the receiver inputs are open, the receiver outputs are always high.

The SN75ALS1177 and SN75ALS1178 are characterized for operation from 0°C to 70°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

PLASTIC

DIP

(N)

PLASTIC

SMALL OUTLINE

(NS)

0°Cto70°C

SN75ALS1177N SN75ALS1177NSR

0°C

70°C

SN75ALS1178N SN75ALS1178NSR

The NS package is only available taped and reeled. Add the

suffix R to the device type (e.g., SN75ALS1177NSR).

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.

GND

SN75ALS1177 ...N OR NS PACKAGE

(TOP VIEW)

1DE

GND

2DE

SN75ALS1178 ...N OR NS PACKAGE

(TOP VIEW)

Summary of content (16 pages)

PAGE 1
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 D D D D D D D D D D D D D SN75ALS1177 . . .
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SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 Function Tables SN75ALS1177, SN75ALS1178 (each driver) OUTPUTS INPUT D ENABLE DE H H H L L H L H X L Z Z Y Z SN75ALS1177 (each receiver) DIFFERENTIAL A–B ENABLE RE OUTPUT Y VID ≥ 0.2 V –0.2 V < VID < 0.2 V L H L ? VID ≤ –0.2 V X L L H Z Open L H SN75ALS1178 (each receiver) DIFFERENTIAL A–B OUTPUT Y VID ≥ 0.2 V –0.2 V < VID < 0.2 V H ? VID ≤ –0.
PAGE 3
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 logic diagram (positive logic) SN75ALS1177 DE RE 1D 1R 2D SN75ALS1178 12 1DE 1D 4 14 15 13 2 3 1 10 9 11 6 2R 5 7 1Y 1R 1Z 2DE 1A 2D 4 14 15 13 2 3 1 12 10 9 11 1B 2R 2Y 6 5 7 1Y 1Z 1A 1B 2Y 2Z 2A 2B 2Z 2A 2B equivalent schematics EQUIVALENT OF DRIVER OR ENABLE INPUT EQUIVALENT OF RECEIVER INPUT VCC VCC 35 kΩ NOM Input 17 kΩ NOM 1.
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SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 schematics of outputs TYPICAL OF DRIVER OUTPUTS TYPICAL OF RECEIVER OUTPUTS VCC VCC 70 Ω NOM Output Output GND absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 recommended operating conditions VCC VID Supply voltage Differential input voltage Receiver VOC VIC Common-mode output voltage Driver Common-mode input voltage Receiver VIH VIL High-level input voltage DE, RE, D Low-level input voltage DE, RE, D IOH High level output current High-level IOL Driver Receiver Driver Low level output current Low-level Receiver MIN NOM MAX UNIT 4.
PAGE 6
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 DRIVER SECTION electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER VIK VOH Input clamp voltage VOL |VOD1| Low-level output voltage TEST CONDITIONS II = –18 mA VIH = 2 V, High-level output voltage VIH = 2 V, IO = 0 Differential output voltage |VOD2| Differential output voltage g VIL = 0.8 V, VIL = 0.
PAGE 7
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 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 Input hysteresis voltage (VIT+ – VIT–) VOH High-level output voltage VOL Low-level output voltage IOZ High-impedance-state output current TEST CONDI
PAGE 8
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 PARAMETER MEASUREMENT INFORMATION VID RL 2 IOH VOH VOD2 RL 2 VOL Figure 2. Receiver Test Circuit, VOH and VOL Figure 1. Driver Test Circuit, VOD and VOC 1.5 V 1.
PAGE 9
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 PARAMETER MEASUREMENT INFORMATION VCC RL = 500 Ω S1 3V Output 1.5 V Input 3 V or 0 V 1.5 V 0V CL (see Note A) Generator (see Note B) tPZL tPLZ 0.5 V 50 Ω 0V 2.3 V Output VOL DRIVER TEST CIRCUIT DRIVER VOLTAGE WAVEFORMS NOTES: A. CL includes probe and jig capacitance. B. The pulse generator has the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns.
PAGE 10
SN75ALS1177, SN75ALS1178 DUAL DIFFERENTIAL DRIVERS AND RECEIVERS SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001 PARAMETER MEASUREMENT INFORMATION S1 Output 1.5 V S2 1 kΩ –1.5 V CL (see Note A) Generator (see Note B) VCC 1N916 or Equivalent 1 kΩ 50 Ω S3 RECEIVER TEST CIRCUIT 3V 1.5 V Input 1.5 V 0V S1 to –1.5 V S2 Closed S3 Closed tPZL S1 to –1.5 V S2 Closed S3 Closed tPLZ 0.5 V 5V 1.5 V Output S1 to 1.5 V S2 Open S3 Closed VOL tPZH VOH 1.5 V S1 to 1.5 V S2 Open S3 Closed 0V tPHZ 0.
PAGE 11
PACKAGE OPTION ADDENDUM www.ti.
PAGE 12
PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel Diameter Width (mm) W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant SN75ALS1177NSR SO NS 16 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.0 Q1 SN75ALS1178NSR SO NS 16 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN75ALS1177NSR SO NS 16 2000 346.0 346.0 33.0 SN75ALS1178NSR SO NS 16 2000 346.0 346.0 33.
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