_______________________________________________________________________________________ 7
MAX563
+3.3V-Powered, EIA/TIA-562 Dual Transceiver
with Receivers Active in Shutdown
Table 1. Summary of EIA/TIA-232E/V.28 and EIA/TIA-562 Specifications
NAMEDB9 PIN SYMBOL
5
9 Ring Indicator
GND
DB25 PIN
7 Signal Ground
1 DCD
RI22
Received Line Signal Detector (some-
times called Data Carrier Detect)
6
2 RxD
DSR
Handshake from DCE
8
Data Set Ready
3 TxD
7
6
3 Receiver Data
2 Transmit Data
RTS4
20
Request to Send
4 DTR
5
Data Terminal Ready
Clear to Send8 CTS
FUNCTION
Reference point for signals
Handshake from DCE
Data from DCE
Handshake from DCE
Data from DTE
Handshake from DTE
Handshake from DTE
Handshake from DCE
CONDITIONPARAMETER
EIA/TIA-232E/V.28
SPECIFICATION
Maximum Input Level
Driver Output Resistance with Power Off -2V < V
OUT
< 2V
±25V
5.0V to 15.0V
Driver Output Voltage
0 Level
1 Level
-5.0V to -15.0V
300Ω
3kΩ to 7kΩ load
Maximum Instantaneous Slew Rate
Maximum Output Level ±25V
30V/µs
300Ω
Up to 20kbps
Signal Rate (3kΩ≤R
L
≤7kΩ)
Not defined
Maximum Driver Output Short-Circuit
Current
No load
C
L
= 2500pF
C
L
= 1000pF
100mA
3.0V to 15.0V
Receiver Input Thresholds
0 Level
1 Level
-3.0V to -15.0V
V.28 1ms or 3% of the period
Transition Rate on Driver Output
RS-232 4% of the period
EIA/TIA-562
SPECIFICATION
±25V
3.7V to 13.2V
-3.7V to -13.2V
±13.2V
30V/µs
Up to 20kbps
Up to 64kbps
60mA
3.0V to 15.0V
-3.0V to -15.0V
4V/µs
Table 2. DB9/DB25 Cable Connections Commonly Used for EIA/TIA-232E, EIA/TIA-562 and V.24
Asynchronous Interfaces
