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SN75LBC784 PDF预览

SN75LBC784

更新时间： 2024-09-14 22:53:31
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德州仪器 - TI 驱动器
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7页 93K
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QUADRUPLE RS-423-B DRIVER/RECEIVER

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SN75LBC784 数据手册

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SN75LBC784  
QUADRUPLE RS-423-B DRIVER/RECEIVER  
SLLS187A – NOVEMBER 1994 – REVISED AUGUST 1995  
DW PACKAGE  
(TOP VIEW)  
Four Independent Drivers and Receivers  
Driver Slew Rate Controlled by a Single  
Resistor  
3A  
3Z  
BIAS  
2Z  
1
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
Fast Driver Transition Times Down to  
1.5 µs and Receiver Transition Times of  
20 ns Typ  
2
BIAS  
4A  
2A  
3
BIAS  
1Z  
4
Internal Thermal-Overload Protection  
4Z  
5
BIAS  
1A  
6
RS-423-B Inputs and Outputs Designed to  
Withstand ±25 V  
V
R
7
SS  
ws  
GND  
4B  
V
8
DD  
ESD Protection Exceeds 2000 V Per  
MIL-STD-833C Method 3015  
1Y  
1B  
2Y  
9
4Y  
10  
11  
LinBICMOS Process Technology  
3B  
3Y 12  
3C 13  
4C 14  
17 2B  
16 2C  
15 1C  
description  
The SN75LBC784 performs as four independent  
RS-423-B driver/receiver pairs designed to  
interface data terminal equipment (DTE) with data  
circuit-terminating equipment (DCE) at rates up to  
120 kbps and distances to 1.2 km. The  
SN75LBC784 provides an upgrade to the RS-232  
serial interface and can be backward compatible  
with existing serial ports while offering the higher  
performance required by new faster peripherals,  
such as v.34 (v.fast) modems. The RS-232  
standard, and subsequent revisions, only support  
data rates up to 20 kbps over about 15 meters of  
cable. For RS-423-B the data rate is increased to  
120 kbps and transmission distance to 1.2 km by  
reducing the maximum output signal swing,  
increasing the driver output current, and reducing  
the receiver input voltage thresholds.  
FUNCTION TABLE  
INPUTS OUTPUTS  
C
A
B
Z
Y
H
L
H
L
L
H
L
L
L
H
H
H
H
L
H
H
L
H
L
L
L
H
L
L
L
H
H
?
?
?
?
H
L
H
L
L
L
H
H
H
H = high level, L = low level,  
X = irrelevant, Z = high impedance (off)  
? = indeterminate  
The receivers consist of differential comparators with hysteresis and resistive attenuation on the inputs. The  
resistive attenuation improves the input common mode range and also provides additional protection from ESD  
and over-voltage stress. The differential and common mode input impedances are sufficiently high to meet  
RS-423-B. When a differential voltage input of 500 mV is applied across the entire common mode range ( see  
Figure 5), the receiver characteristics and bias voltage allow the receiver to remain in its intended binary state.  
The drivers meet all RS-423-B specifications with built-in current limits and thermal-overload protection.  
Slew-rate controlling circuitry is included in the design, which is adjusted to suit the application by means of an  
external resistor (R . The slew rate controlling circuitry also has a default mode – if the R pin is shorted to  
ws)  
ws  
5 V externally, the transistion time defaults to approximately 1.5 ms. The BIAS input, when shorted to 5 V  
externally, provides the internal node voltages. The receiver is compatible to RS-232 with the use of external  
input resistors to meet the RS-232 input resistance specification of 3 kΩ to 7 kΩ.  
The SN75LBC784 is characterized for operation over the temperature range of 0°C to 70°C.  
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.  
LinBiCMOS is a trademark of Texas Instruments Incorporated.  
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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567

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