Texas Instruments SN75LPE185DBR, SN75LPE185DW, SN75LPE185DWR, SN75LPE185NT, SN75LPE185PWR Datasheet
SN75LPE185
LOW-POWER MULTIPLE RS-232 DRIVERS/RECEIVERS
WITH ENABLE
SLLS256D – DECEMBER 1996 – REVISED OCTOBER 1998
D
Single-Chip RS-232 Interface for IBM PC
Compatible Serial Port
D
Designed to Transmit and Receive 4-µs Pulses
(Equivalent to 256 kbit/s)
D
Standby Power Is Less Than 750 µW Maximum
D
Wide Supply-Voltage Range . . . 4.75 V to 15 V
D
Driver Output Slew Rates Are Internally
Controlled to 30-V/µs Maximum
D
RS-232 Bus-Pin ESD Protection Exceeds:
– 15 kV, Human-Body Model
– 8-kV IEC1000-4-2, Contact
– 15-kV IEC1000-4-2, Air Gap
D
Receiver Input Hysteresis . . . 1000 mV Typical
D
Three Drivers and Five Receivers Meet or
Exceed the Requirements of TIA/EIA-232-F and
ITU v.28 Standards
D
Complements the SN75LP196
D
One Receiver Remains Active During WAKE-UP
Mode (100 µA Maximum)
D
Matches the Flow-Through Pinout of the
Industry-Standard SN75185, SN75C185, and
SN75LP185, With Additional Control Pins
D
Package Options Include Plastic Shrink
Small-Outline (DB), Small-Outline (DW), Thin
Shrink Small-Outline (PW), and Standard
Plastic (NT) DIPs
DB, DW, NT, OR PW PACKAGE
MODE
NC – No internal connection
V
DD
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
V
SS
EN
(TOP VIEW)
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
V
CC
RY1
RY2
RY3
DA1
DA2
RY4
DA3
RY5
GND
NC
NC
description
The SN75LPE185 is a low-power bipolar device containing three drivers and five receivers, with 15-kV ESD
protection on the bus pins, with respect to each other. Bus pins are defined as those pins that tie directly to the
serial-port connector, including GND. The pinout matches the flow-through design of the industry-standard
SN75185, SN75C185, and SN75LP185, with the addition of four pins for control signals. The flow-through
pinout of the device allows easy interconnection of the UART and serial-port connector of the IBM PC
compatibles. The SN75LPE185 provides a rugged, low-cost solution for this function with the combination of
bipolar processing and 15-kV ESD protection.
The SN75LPE185 has an internal slew-rate control to provide a maximum rate of change in the output signal
of 30 V/µs. The driver output swing is clamped at ±6 V to enable the higher data rates associated with this device
and reduce EMI emissions. Although the driver outputs are clamped, the outputs can handle voltages up to
±15 V without damage.
The device has flexible control options for power management when the serial port is inactive. A common
disable for all of the drivers and receivers is provided with the active-low enable (EN
(MODE) input selects between the ST ANDBY and W AKE-UP modes. With a low-level input on the MODE pin
and a high-level input on the EN
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.
IBM and PC are trademarks of International Business Machines Corporation.
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.
pin, one receiver remains active while the remaining drivers and receivers are
Copyright 1998, Texas Instruments Incorporated
) input. The mode control
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN75LPE185
LOW-POWER MULTIPLE RS-232 DRIVERS/RECEIVERS
WITH ENABLE
SLLS256D – DECEMBER 1996 – REVISED OCTOBER 1998
description (continued)
disabled to implement the WAKE-UP mode. With a high-level input on both the MODE and EN pins, all drivers
and receivers are disabled to implement the STANDBY mode. The outputs of the drivers are in a
high-impedance state when the device is powered off. To ensure the outputs of the receivers are in a known
output level (as listed in the
in ST ANDBY , or WAKE-UP mode, external pullup/pulldown circuitry must be provided. All the logic inputs accept
3.3-V or 5-V input signals.
The SN75LPE185 complies with the requirements of TIA/EIA-232-F and ITU v .28 standards. These standards
are for data interchange between a host computer and peripheral at signaling rates up to 20 kbit/s. The switching
speeds of the SN75LPE185 support rates up to 256 kbit/s.
The SN75LPE185 is characterized for operation from 0°C to 70°C.
Application Information
Function Tables
DRIVERS
INPUT
DA
X H Z
H L L
L L H
Open L L
H Open L
L Open H
H = high level, L = low level,
X = irrelevant, Z = high impedance (off)
ENABLEENOUTPUT
section of this data sheet) when the device is powered off,
DY
RECEIVERS
INPUTS
RA1–RA4 RA5 EN MODE RY1–RY4 RY5
H H L X L L
L L L X H H
X H H L Z L
X L H L Z H
X X H H Z Z
Open Open L X H H
H H L Open L L
L L L Open H H
X H H Open Z L
X L H Open Z H
H H Open X L L
L L Open X H H
H = high level, L = low level, X = irrelevant, Z = high impedance (off)
ENABLE INPUTS OUTPUTS
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional logic diagram (positive logic)
SN75LPE185
LOW-POWER MULTIPLE RS-232 DRIVERS/RECEIVERS
WITH ENABLE
SLLS256D – DECEMBER 1996 – REVISED OCTOBER 1998
EN
MODE
2
RA1 RY1
3
RA2
4
RA3
5
DY1
6
DY2
7
RA4
8
DY3
9
RA5
11
12
23
22
21
20
19
18
17
16
RY2
RY3
DA1
DA2
RY4
DA3
RY5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN75LPE185
LOW-POWER MULTIPLE RS-232 DRIVERS/RECEIVERS
WITH ENABLE
SLLS256D – DECEMBER 1996 – REVISED OCTOBER 1998
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Positive supply voltage range:V
Negative supply voltage range, V
Receiver input voltage range, V
Driver input voltage range, V
Receiver output voltage range, V
Driver output voltage range, V
Electrostatic discharge, bus pins: Machine model (see Note 2) Class 3, 500 V. . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic discharge, all pins: Human-body model (see Note 2) Class 3, 5 kV. . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
Storage temperature range, T
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to network ground terminal unless otherwise noted.
2. Per MIL-STD-883 Method 3015.7
3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 1) –0.5 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V
DD
(see Note 1) 0.5 V to –15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SS
(RA) –30 V to 30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
(DA, EN, MODE) –0.5 V to V
I
(RY) –0.5 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
(DY) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
Human-body model (see Note 2) Class 3, 15 kV. . . . . . . . . . . . . . . . . . . . . .
IEC1000-4-2: contact Class 3, 8 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IEC1000-4-2: airgap Class 3, 15 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine model (see Note 2) Class 3, 200 V. . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): DB package 104°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
DW package 81°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NT package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 120°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
CC
+ 0.4 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, VCC (see Note 4) 4.75 5 5.25 V
Supply voltage, V
Supply voltage, V
High level input voltage, V
Low level input voltage, V
Receiver input voltage range, V
High level output current, I
Low level output current, I
Operating free air temperature, T
NOTE 4: VCC cannot be greater than VDD.
DD
SS
IH
IL
I
OH
OL
A
DA, EN, MODE 2 V
DA, EN, MODE 0.8 V
RA –25 25 V
RY –1 mA
RY 2 mA
9 12 15 V
–9 –12 –15 V
0 70 °C
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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