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參數(shù)資料
| 型號： | SN75LBC784DW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | Buffer和線驅(qū)動 |
| 英文描述： | QUAD LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 157K |
| 代理商： | SN75LBC784DW |
FEATURES
Four Independent Drivers and Receivers
Driver Slew Rate Controlled by a Single
Resistor
Fast Driver Transition Times Down to
1.5
μ
s and Receiver Transition Times of
20 ns Typ
Internal Thermal-Overload Protection
RS-423-B Inputs and Outputs Designed to
Withstand
±
25 V
ESD Protection Exceeds 2000 V Per
MIL-STD-833C Method 3015
LinBICMOS
Process Technology
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 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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
3A
3Z
BIAS
4A
4Z
BIAS
V
SS
GND
4B
4Y
3B
3Y
3C
4C
BIAS
2Z
2A
BIAS
1Z
1A
R
ws
V
DD
1Y
1B
2Y
2B
2C
1C
DW PACKAGE
(TOP VIEW)
INPUTS
B
L
L
H
H
OUTPUTS
Z
L
H
L
H
FUNCTION TABLE
A
H
H
L
L
H
H
L
L
Y
H
L
H
L
H = high level,
X = irrelevant,
= indeterminate
L = low level,
Z = high impedance (off)
L
H
L
H
L
L
H
H
L
L
H
H
H
L
H
L
C
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
ws)
. The slew rate
controlling circuitry also has a default mode—if the R
ws
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 k
to 7 k
.
The SN75LBC784 is characterized for operation over the temperature range of 0
°
C to +70
°
C.
www.ti.com
SN75LBC784
SLLS187B NOVEMBER 1994 REVISED JUNE 2007
QUADRUPLE RS-423-B
DRIVER/RECEIVER
!
!
www.ti.com
Copyright
19942007, Texas Instruments Incorporated
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.
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參數(shù)描述 |
|---|---|
| SN75LBC784DWG4 | 功能描述:總線收發(fā)器 Quad RS423B Driver Receiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SN75LBC784DWR | 功能描述:總線收發(fā)器 Quad RS423B Driver Receiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SN75LBC784DWRG4 | 功能描述:總線收發(fā)器 Quad RS423B Driver Receiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SN75LBC786DW | 功能描述:緩沖器和線路驅(qū)動器 Quad RS423B Driver Receiver RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN75LBC786DWG4 | 功能描述:總線收發(fā)器 Quad RS423B Driver Receiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
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