SN75LBC784 Datasheet | QUADRUPLE RS-423-B DRIVER/RECEIVER





(Datasheet) SN75LBC784 Datasheet PDF Download

Part Number SN75LBC784
Description QUADRUPLE RS-423-B DRIVER/RECEIVER
Manufacture etcTI
Total Page 10 Pages
PDF Download Download SN75LBC784 Datasheet PDF

Features: SN75LBC784 www.ti.com SLLS187B − NOV EMBER 1994 − REVISED JUNE 2007 QUADRU PLE RS-423-B DRIVER/RECEIVER FEATURES D Four Independent Drivers and Receiver s D Driver Slew Rate Controlled by a Si ngle Resistor D Fast Driver Transition Times Down to 1.5 µs and Receiver Tran sition Times of 20 ns Typ D Internal Th ermal-Overload Protection D RS-423-B In puts and Outputs Designed to Withstand ± 25 V D ESD Protection Exceeds 2000 V Per MIL-STD-833C Method 3015 D LinBICM OS Process Technology DESCRIPTION D W PACKAGE (TOP VIEW) 3A 3Z BIAS 4A 4Z BIAS VSS GND 4B 4Y 3B 3Y 3C 4C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 BIAS 27 2 Z 26 2A 25 BIAS 24 1Z 23 1A 22 Rws 21 V DD 20 1Y 19 1B 18 2Y 17 2B 16 2C 15 1C The SN75LBC784 performs as four indepe ndent RS-423-B driver/receiver pairs de signed to interface data terminal equip ment (DTE) with data circuit-terminatin g equipment (DCE) at rates up to 120 kb ps and distances to 1.2 km. The SN75LBC 784 provides an upgrade to the RS-232 serial interface and can be backw.

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SN75LBC784
www.ti.com
SLLS187B − NOVEMBER 1994 − REVISED JUNE 2007
QUADRUPLE RS-423-B
DRIVER/RECEIVER
FEATURES
D Four Independent Drivers and Receivers
D Driver Slew Rate Controlled by a Single
Resistor
D Fast Driver Transition Times Down to
1.5 µs and Receiver Transition Times of
20 ns Typ
D Internal Thermal-Overload Protection
D RS-423-B Inputs and Outputs Designed to
Withstand ± 25 V
D ESD Protection Exceeds 2000 V Per
MIL-STD-833C Method 3015
D LinBICMOSProcess Technology
DESCRIPTION
DW PACKAGE
(TOP VIEW)
3A
3Z
BIAS
4A
4Z
BIAS
VSS
GND
4B
4Y
3B
3Y
3C
4C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 BIAS
27 2Z
26 2A
25 BIAS
24 1Z
23 1A
22 Rws
21 VDD
20 1Y
19 1B
18 2Y
17 2B
16 2C
15 1C
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 backwards-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 supports 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
A BC
L LH
HLH
L HL
H HL
OUTPUTS
ZY
HH
HL
LH
LL
L LL
HLL
L HH
H HH
?H
?L
?H
?L
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 (Rws). The slew rate
controlling circuitry also has a default mode—if the Rws pin is shorted to 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 kto 7 k.
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. All other trademarks are the property of their respective owners.
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.
Copyright 1994−2007, Texas Instruments Incorporated
www.ti.com

                    
        






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