Texas Instruments SN75C185DW, SN75C185DWR, SN75C185N Datasheet
SN75C185
LOW-POWER MULTIPLE DRIVERS AND RECEIVERS
SLLS065F – AUGUST 1989 – REVISED JANUARY 2000
D
Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU Recommendation
DW OR N PACKAGE
(TOP VIEW)
V.28
D
Single Chip With Easy Interface Between
UART and Serial-Port Connector
D
Less Than 9-mW Power Consumption
D
Wide Driver Supply Voltage . . . 4.5 V to
13.2 V
D
Driver Output Slew Rate Limited to
30 V/µs Max
D
Receiver Input Hysteresis ...1100 mV Typ
D
Push-Pull Receiver Outputs
D
On-Chip Receiver 1-µs Noise Filter
D
Functionally Interchangeable With Texas
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
Instruments SN75185
D
Operates Up to 120 kbit/s Over a 3-Meter
Cable (See
Conditions)
Application Information
for
description
The SN75C185 is a low-power BiMOS device containing three independent drivers and five receivers that are
used to interface data terminal equipment (DTE) with data circuit-terminating equipment (DCE). Typically, the
SN75C185 replaces one SN75188 and two SN75189 devices. This device conforms to TIA/EIA-232-F. The
drivers and receivers of the SN75C185 are similar to those of the SN75C188 and SN75C189A, respectively.
The drivers have a controlled output slew rate that is limited to a maximum of 30 V/µs, and the receivers have
filters that reject input noise pulses that are shorter than 1 µs. Both these features eliminate the need for external
components.
The SN75C185 uses the low-power BiMOS technology. In most applications, the receivers contained in this
device interface to single inputs of peripheral devices such as ACEs, UARTS, or microprocessors. By using
sampling, such peripheral devices usually are insensitive to the transition times of the input signals. If this is not
the case, or for other uses, it is recommended that the SN75C185 receiver outputs be buffered by single Schmitt
input gates or single gates of the HCMOS, ALS, or 74F logic families.
The SN75C185 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.
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 2000, Texas Instruments Incorporated
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN75C185
LOW-POWER MULTIPLE DRIVERS AND RECEIVERS
SLLS065F – AUGUST 1989 – REVISED JANUARY 2000
logic symbol
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
†
2
3
4
5
6
7
8
9
19
18
17
16
15
14
13
12
RY1
RY2
RY3
DA1
DA2
RY4
DA3
RY5
logic diagram (positive logic)
RY1RA1
RY2RA2
RY3RA3
DA1DY1
DA2DY2
RY4RA4
DA3DY3
RY5RA5
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LOW-POWER MULTIPLE DRIVERS AND RECEIVERS
equivalent schematics of inputs and outputs
EQUIVALENT DRIVER INPUT EQUIVALENT DRIVER OUTPUT
SN75C185
SLLS065F – AUGUST 1989 – REVISED JANUARY 2000
V
DD
V
DD
Input
GND
Input
RA
DA
EQUIVALENT RECEIVER INPUT
ESD
Protection
ESD
Protection
3.4 kΩ
1.5 kΩ
530 kΩ
Internal
1.4-V Ref
to GND
160 Ω
74 Ω
V
SS
EQUIVALENT RECEIVER OUTPUT
72 Ω
Output
V
CC
Output
DY
GND
V
SS
RY
All resistor values are nominal.
GND
GND
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
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