NM232DDC Datasheet, PDF (1/5 Pages) C&D Technologies – Isolated Dual EIA-232-D Transmitter and Receiver

NM232DDC
Isolated Dual EIA-232-D Transmitter and Receiver
FEATURES
n RoHS compliant
n Single 5V supply
n 50µW low power shutdown
n TTL/CMOS Logic compatible
n EIA-232-D/E and CCITT V.28 compatible
n Dual transmitters and receivers
n 1.5kVrms Isolation
DESCRIPTION
The NM232DDC is an electrically isolated dual
transmitter and receiver designed to inter-
face data terminal equipment (DTE) with data
communications equipment (DCE). The device
provides two data receive channels and two data
transmit channels. Each channel is EIA-232-D,
EIA-232‑E and CCITT V.28 compatible at the
interface boundary and TTL/CMOS compatible at
the logic connections. No external components
are needed and a single 5V input supply powers
all functions either side of the isolation boundary.
A low-power shutdown mode and high impedance
state for receiver outputs is effected via two pins,
SHUTDOWN and ENABLE. The device is supplied
in a low profile 24 pin DIL package.
ELECTRICAL CHARACTERISTICS
Parameter
Test conditions
MIN. TYP. MAX. Units
High threshold input logic, VIH
TXIN, SHUTDOWN, ENABLE
1.8
2.4
V
Low threshold input logic, VIL
TXIN, SHUTDOWN, ENABLE
0.8
1.3
V
Input Hysteresis, ΔVT
TXIN
0.5
V
Leakage Current, IL
TXIN , SHUTDOWN or ENABLE = VCC
10
µA
Input capacitance, CIN
TXIN
5.0
pF
Low level output voltage, VOL
IOUT = 3.2mA
0.4
V
High level output voltage, VOH
IOUT = -1.0mA
2.4
V
Input pull up current
VIN = OV
4.0
20
µA
±VREF Current
TXOUT = 3kΩ, RXOUT = 2.2kΩ
3.0
mA
ELECTRICAL CHARACTERISTICS - EIA-232-D
Parameter
Test conditions
Positive going threshold, VT+
RXIN
Negative going threshold, VT-
RXIN
Input Hysteresis, ΔVT
RXIN
Input resistance
RXIN
Output voltage, VPP
TXOUT, RL=3kΩ to ISO GND
Output leakage current, IL
SHUTDOWN=VCC, TXOUT=±15V
Output slew rate, SR
RL=3kΩ, CL=2500pF
Propagation delay, TL
Logic to RS232
Propagation delay, TR
RS232 to logic
Transmission rate
RL=3kΩ, CL=2500pF
Supply voltage, VCC
Supply current, ICC
TXIN=0.8V, TXOUT=3kΩ,
RXIN=3.0V, RXOUT=2.2kΩ
Shutdown current ICC
SHUTDOWN=1
ENABLE input current, IEN
ENABLE=OV to VCC
Shutdown input current, ISHUTDOWN
SHUTDOWN=OV to VCC
MTTF¹
MIN. TYP. MAX. Units
1.8
3.0
V
0.6
1.2
V
0.6
V
3.0
7.0
kΩ
±5.0 ±7.0
V
-10
10
µA
3.0
30
V/µs
20
µs
10
µs
9.6 kbps
4.5
5.5
V
53
mA
1.0
10
µA
1.0
µA
1.0
µA
187
kHrs
TEMPERATURE CHARACTERISTICS
Parameter
Operating free-air temperature range
Storage temperature range
MIN. TYP. MAX. Units
0
70
ºC
-55
125
ºC
ABSOLUTE MAXIMUM RATINGS
Supply voltage VCC with respect to pin 10
Input voltage to logic pins 3, 7, 8, & 11 with respect to
pin 10
Voltages with respect to ISO GND pin 22
Short circuit on pins 19 & 20
Power dissipation
NM232DDC maximum data rate
Lead case temperature 1.5mm from case for 10 seconds
EIA-232-D input voltage, pins 17 & 18
EIA-232-D input voltage, pins 19 & 20
Positive input voltage, pins 16 & 21
Negative input voltage, pin 23
-0.3V to +6V
-0.3V to
VCC+0.3V
-30V to +30V
-15V to +15V
+14V
-14V
Indefinite
700mW
9.6kbps
300ºC
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
1. Calulated using MIL-HDBK-217F.
All data taken at TA=25°C, VCC=5V.
Conditions
Flash tested for 1 second
MIN. TYP. MAX. Units
1500
Vrms
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