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SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335A – JANUARY 1999 – REVISED JANUARY 2001
D
D
D
D
D
D
D
D
D
D
D
Single-Chip TIA/EIA-232-F Interface for
IBM PC/AT Serial Port
Designed to Transmit and Receive 4-µs
Pulses (Equivalent to 256 kbit/s)
Less Than 21-mW Power Consumption
Wide Supply-Voltage Range . . . 4.75 V to
15 V
Driver Output Slew Rates Are Internally
Controlled to 30 V/µs Max
Receiver Input Hysteresis . . . 1000 mV
Typical
TIA/EIA-232-F Bus-Pin ESD Protection
Exceeds:
– 15-kV, Human-Body Model
Three Drivers and Five Receivers Meet or
Exceed the Requirements of TIA/EIA-232-F
and ITU V.28
Complements the SN75LP196
Designed to Replace the Industry-Standard
SN75185 and SN75C185 With the Same
Flow-Through Pinout
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Dual-In-Line (N) Packages
DB, DW, OR N PACKAGE
(TOP VIEW)
V
DD
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
V
SS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
RY1
RY2
RY3
DA1
DA2
RY4
DA3
RY5
GND
description
The SN75LP1185 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 SN75LP1185 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.
Copyright
2001, Texas Instruments Incorporated
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•
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1
SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335A – JANUARY 1999 – REVISED JANUARY 2001
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
PLASTIC SHRINK
SMALL-OUTLINE
(DB)
SN75LP1185DBR
PLASTIC
SMALL OUTLINE
(DW)
SN75LP1185DW
PLASTIC
DIP
(N)
SN75LP1185N
0°C to 70°C
The DB package is only available taped and reeled. The DW package also is available
taped and reeled. Add the suffix R to device type (e.g., SN75LP1185DWR).
Function Tables
DRIVER
INPUT
DA
H
L
Open
OUTPUT
DY
L
H
L
RECEIVER
INPUT
RA
H
L
Open
OUTPUT
RY
L
H
H
logic diagram (positive logic)
2
RA1
3
RA2
4
RA3
5
DY1
DY2
RA4
DY3
RA5
6
7
8
9
15
DA2
14
13
12
RY5
RY4
DA3
16
DA1
17
RY3
18
RY2
19
RY1
2
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SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335A – JANUARY 1999 – REVISED JANUARY 2001
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Positive supply-voltage range (see Note 1): V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 15 V
Negative supply-voltage range, V
SS
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to –15 V
Input-voltage range, V
I
: Receiver (RA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 V to 30 V
Driver (DA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
CC
+ 0.4 V
Output-voltage range, V
O
: Receiver (RY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6 V
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
All pins (human-body model) (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . Class 3: 5 kV
All pins (machine model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 V
Package thermal impedance,
θ
JA
(see Note 3): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°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 51-7.
recommended operating conditions
MIN
VCC
VDD
VSS
VIH
VIL
VI
IOH
IOL
Supply voltage (see Note 4)
Supply voltage (see Note 5)
Supply voltage (see Note 5)
High-level input voltage
Low-level input voltage
Receiver input voltage
High-level output current
Low-level output current
DA
DA
RA
RY
RY
–25
4.75
9
–9
2
0.8
25
–1
2
NOM
5
12
–12
MAX
5.25
15
–15
UNIT
V
V
V
V
V
V
mA
mA
TA
Operating free-air temperature
0
70
°C
NOTES: 4. VCC cannot be greater than VDD.
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.
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3
SN75LP1185
LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS335A – JANUARY 1999 – REVISED JANUARY 2001
supply currents over the recommended operating conditions (unless otherwise noted)
PARAMETER
Supply current for VCC ICC
CC,
Supply current for VDD IDD
DD,
Supply current for VSS ISS
SS,
No load,
All in uts at minimum VOH or
inputs
maximum VOL
TEST CONDITIONS
VDD = 9 V,
VDD = 12 V,
VDD = 9 V,
VDD = 12 V,
VDD = 9 V,
VDD = 12 V,
VSS = –9 V
VSS = –12 V
VSS = –9 V
VSS = –12 V
VSS = –9 V
VSS = –12 V
MIN
TYP
MAX
1000
1000
800
800
–625
–625
µA
UNIT
driver electrical characterisitics over the recommended operating conditions (unless otherwise
noted)
PARAMETER
VOH
High-level
High level output voltage
VIL = 0.8 V,
RL = 3 kΩ
kΩ,
See Figure 1
VIH = 2 V,
RL = 3 kΩ
kΩ,
See Figure 1
VI at VCC
VI at GND
VO = GND or VSS,
VO = GND or VDD,
See Figure 2 and Note 7
See Figure 2 and Note 7
–30
30
TEST CONDITIONS
VDD = 9 V,
VDD = 12 V,
VDD = 9 V,
VDD = 12 V,
VSS = –9 V
VSS = –12 V,
VSS = –9 V
VSS = –12 V,
See Note 6
See Note 6
MIN
5
5
–5
–5
TYP
5.8
5.8
–5.8
–5.9
MAX
6.6
V
6.6
–6.9
V
–6.9
1
–1
–55
55
µA
µA
mA
mA
UNIT
VOL
IIH
IIL
IOS(H)
IOS(L)
ro
Low-level
Low level output voltage
High-level input current
Low-level input current
Short-circuit
high-level output current
Short-circuit
low-level output current
Output resistance
VDD = VSS = VCC = 0,
VO = 2 V
300
Ω
NOTES: 6. Maximum output swing is clamped nominally at
±6
V to enable the higher data rates associated with this device and to reduce EMI
emissions. The driver outputs may slightly exceed the maximum output voltage over the full VCC and temperature ranges.
7. Not more than one output should be shorted at one time.
4
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