ADM242 AD [Analog Devices], ADM242 Datasheet

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ADM242

Manufacturer Part Number
ADM242
Description
High Speed, +5 V, 0.1 uF CMOS RS-232 Drivers/Receivers
Manufacturer
AD [Analog Devices]
Datasheet

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a
GENERAL DESCRIPTION
The ADM222, ADM232A, ADM242 are a family of high speed
RS-232 line drivers/receivers offering transmission rates up to
200 kB/s. Operating from a single +5 V power supply, a highly
efficient on-chip charge pump using small (0.1 F) external
capacitors allows RS-232 bipolar levels to be developed. Two
RS-232 drivers and two RS-232 receivers are provided on each
device.
The devices are fabricated on BiCMOS, an advanced mixed
technology process which combines low power CMOS with high
speed bipolar circuitry. This allows for transmission rates up to
200 kB/s yet minimizes the quiescent power supply current to
under 5 mA.
The ADM232A is a pin-compatible, high speed upgrade for the
AD232 and for the ADM232L. It is available in 16-pin DIP and
in both narrow and wide surface mount (SOIC) packages.
The ADM222 contains an additional shutdown (SHDN) func-
tion which may be used to disable the device thereby reducing
the supply current to 0.1 A. During shutdown, all transmit/
receive functions are disabled. The ADM222 is available in
18-pin DIP and in a wide surface mount (SOIC) package.
The ADM242 combines both shutdown (SHDN) and enable
(EN) functions. The shutdown function reduces the supply
curent to 0.1 mA. During shutdown, the transmitters are
disabled but the receivers continue to operate normally. The
enable function allows the receiver outputs to be disabled
thereby facilitating sharing a common bus. The ADM242 is
available in 18-pin DIP and in a wide surface mount (SOIC)
package.
*Protected by U.S. Patent No. 5,237,209.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
200 kB/s Transmission Rate
Small (0.1 F) Charge Pump Capacitors
Single 5 V Power Supply
Meets All EIA-232-E and V.28 Specifications
Two Drivers and Two Receivers
On-Board DC-DC Converters
Pin Compatible with MAX222/MAX232A/MAX242
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
9 V Output Swing with +5 V Supply
30 V Receiver Input Levels
CMOS RS-232 Drivers/Receivers
Model
ADM222AN
ADM242AR
ADM222AR
ADM232AAN
ADM232AARN
ADM232AARW
ADM242AN
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
TTL/CMOS
OUTPUTS
ADM222/ADM232A/ADM242*
TTL/CMOS
INPUTS
*
0.1µF
0.1µF
R2
R1
T1
T2
OUT
FUNCTIONAL BLOCK DIAGRAM
OUT
IN
IN
High Speed, +5 V, 0.1 F
C1+
C1–
C2+
C2–
Temperature Range
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
ORDERING GUIDE
ADM2xx
0.1µF
VOLTAGE DOUBLER
VOLTAGE INVERTER
+5V TO +10V
+5V TO –10V
GND
T1
T2
V
CC
R1
R2
**
*
+5V INPUT
ON EACH TTL/MOS INPUT
INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
INTERNAL 400k PULL-UP RESISTOR
SHDN
V+
V–
EN
Package Option
N-18
R-18W
N-16
R-16N
R-16W
N-18
R-18W
(ADM222, ADM242)
T1
T2
(ADM242)
R1
R2
Fax: 617/326-8703
0.1µF
OUT
OUT
0.1µF
IN
IN
RS-232
OUTPUTS
RS-232
INPUTS
**

Related parts for ADM242

ADM242 Summary of contents

Page 1

... Modems Printers Instruments GENERAL DESCRIPTION The ADM222, ADM232A, ADM242 are a family of high speed RS-232 line drivers/receivers offering transmission rates up to 200 kB/s. Operating from a single +5 V power supply, a highly efficient on-chip charge pump using small (0.1 F) external capacitors allows RS-232 bipolar levels to be developed. Two RS-232 drivers and two RS-232 receivers are provided on each device ...

Page 2

... ADM222/ADM232A/ADM242–SPECIFICATIONS Parameter RS-232 TRANSMITTERS Output Voltage Swing Input Logic Threshold Low, V INL Input Logic Threshold High, V INH Logic Pullup Current Data Rate Output Resistance Output Short Circuit Current (Instantaneous) RS-232 RECEIVERS RS-232 Input Voltage Range RS-232 Input Threshold Low RS-232 Input Threshold High ...

Page 3

... Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. +3V PHLT V+ 0V V– Figure 3. Receiver Propagation Delay Timing +3.5V +0.8V –3– ADM222/ADM232A/ADM242 + PHLR t PLHR ...

Page 4

... ADM242) Active Low Digital Input. May be used to disable the device so that the power consumption is minimized. On the ADM222 all drivers and receivers are disabled. On the ADM242 the drivers are disabled but the receivers remain enabled SHDN ...

Page 5

... Figure 10. ADM232A Typical Operating Circuit REV GND OUT OUT OUT Figure 11. ADM242 DIP/SOIC Pin Configuration C3 0.1µ 0.1µF 6 V– C4 0.1µ OUT TTL/CMOS RS-232 * INPUTS OUTPUTS 7 T2 OUT TTL/CMOS RS-232 ...

Page 6

... ADM222/ADM232A/ADM242–Typical Performance Characteristics V– I+, ( I– ) – mA Figure 13. Charge Pump V+, V– vs. Current + +25° TX1 = +5V; TX2 = 0V – 5V SQUARE WAVE BOTH TX OUTPUTS LOADED WITH 3k// 1000 2000 LOAD CAPACITANCE – pF Figure 14 ...

Page 7

... On the ADM242, both receivers continue to operate normally. This function is useful for monitoring activity so that when it occurs, the device can be taken out of the shutdown mode. The ADM242 also contains a receiver enable function (EN) which can be used to fully disable the receivers, independent of SHDN. APPLICATIONS INFORMATION A selection of typical operating circuits is shown in Figures ...

Page 8

... ADM222/ADM232A/ADM242 16-Pin Plastic DIP (N-16 0.280 (7.11) PIN 1 0.240 (6.10 0.840 (21.33) 0.745 (18.93) 0.060 (1.52) 0.210 0.015 (0.38) (5.33) 0.200 (5.05) 0.125 (3.18) SEATING 0.022 (0.558) 0.100 0.070 (1.77) PLANE 0.014 (0.356) (2.54) 0.045 (1.15) BSC 16-Lead Wide SOIC (R-16W 0.299 0.419 (7.60) (10.65 0.030 (0.75) 0.413 (10.50) 0.012 (0.3) 0.104 (2.65) 0.05 (1.27) 0.019 (0.49) 0.013 REF (0 ...

Page 9

... ADM222AR – +85 C ADM232AAN – +85 C ADM232AARN – +85 C ADM232AARW – +85 C ADM242AN – +85 C ADM242AR – +85 C *For outline information see Package Information section. REV. 0 ADM222/ADM232A/ADM242 Package Option* N-18 R-18W N-16 R-16N R-16W N-18 R-18W –9– ...

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