Texas Instruments SN75LP1185DBR, SN75LP1185DWR, SN75LP1185N, SN75LP1185PWR Datasheet
SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335 – JANUARY 1999
D
Single-Chip TIA/EIA-232-F Interface for
IBM PC/AT Serial Port
D
Designed to Transmit and Receive 4-µs
Pulses (Equivalent to 256 kbit/s)
D
Less Than 21-mW Power Consumption
D
Wide Supply-Voltage Range, 4.75 V to 15 V
D
Driver Output Slew Rates Are Internally
Controlled to 30 V/µs Max
D
Receiver Input Hysteresis, 1000 mV Typ
D
TIA/EIA-232-F Bus-Pin ESD Protection
Exceeds:
– 15-kV, Human-Body Model
– IEC1000-4-2 Level-4 Compliant
D
Three Drivers and Five Receivers Meet or
Exceed the Requirements of TIA/EIA-232-F
and ITU V.28
D
Complements the SN75LP196
D
Designed to Replace the Industry-Standard
SN75185 and SN75C185 With the Same
Flow-Through Pinout
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Dual-In-Line (N) Packages
DB, DW, N, OR PW PACKAGE
V
DD
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
V
SS
(TOP VIEW)
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
V
CC
RY1
RY2
RY3
DA1
DA2
RY4
DA3
RY5
GND
description
The SN75LP1 185 is a low-power bipolar device containing three drivers and five receivers with 15 kV of 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 and SN75C185. The flow-through pinout of the SN75LP1185 allows easy interconnection of the
UART and serial-port connector of the IBM PC/AT and compatibles. The SN75LP1185 provides a rugged,
low-cost solution for this function with the combination of the bipolar processing and 15 kV of ESD protection.
The SN75LP1185 has internal slew-rate control to provide a maximum rate of change in the output signal of
30 V/µs. The driver output swing is nominally clamped at ±6 V to enable the higher data rates associated with
this device and to reduce EMI emissions. Even though the driver outputs are clamped, they can handle voltages
up to ±15 V without damage. All the logic inputs can accept 3.3-V or 5-V input signals.
The SN75LP1 185 complies with the requirements of TIA/EIA-232-F and ITU V .28. 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 SN75LP1185 support rates up to 256 kbit/s.
The SN75LP1185 is characterized for operation from 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.
IBM and PC/AT 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1999, Texas Instruments Incorporated
1
SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335 – JANUARY 1999
Function Tables
DRIVER
INPUT
DA
Open L
INPUT
RA
Open H
logic diagram (positive logic)
OUTPUT
DY
H L
L H
RECEIVER
OUTPUT
RY
H L
L H
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
2
3
4
5
6
7
8
9
19
18
17
16
15
14
13
12
RY1
RY2
RY3
DA1
DA2
RY4
DA3
RY5
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335 – JANUARY 1999
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Positive supply-voltage range (see Note 1): V
Negative supply-voltage range, V
Input-voltage range, V
: Receiver (RA) –30 V to 30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
(see Note 1) 0.5 V to –15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SS
CC
V
DD
Driver (DA) –0.5 V to V
Output-voltage range, V
: Receiver (RY) –0.5 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
Driver (DY) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic discharge: Bus pins (human-body model) (see Note 2) Class 3: 15 kV. . . . . . . . . . . . . . . . . . . . .
Bus pins (machine model) 500 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bus pins (IEC1000-4-2, contact) 8 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
All pins (human-body model) (see Note 2) Class 3: 5 kV. . . . . . . . . . . . . . . . . . . . . . . .
All pins (machine model) 400 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
(see Note 3): DB package 115°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
DW package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 128°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
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.
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–0.5 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+ 0.4 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
recommended operating conditions
V
V
V
V
V
V
I
OH
I
OL
T
NOTES: 4. VCC cannot be greater than VDD.
Supply voltage (see Note 4) 4.75 5 5.25 V
CC
Supply voltage (see Note 5) 9 12 15 V
DD
Supply voltage (see Note 5) –9 –12 –15 V
SS
High-level input voltage DA 2 V
IH
Low-level input voltage DA 0.8 V
IL
Receiver input voltage RA –25 25 V
I
High-level output current RY –1 mA
Low-level output current RY 2 mA
Operating free-air temperature 0 70 °C
A
5. The device operates down to VDD = VCC and |VSS| = VCC, but supply currents increase and other parameters may vary slightly from
the data sheet limits.
MIN NOM MAX UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
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