Datasheet

REV.
–2–
ADM222/ADM232A/ADM242–SPECIFICATIONS
(V
CC
= 5 V  10%. C1–C4 = 0.1 F; all spec-
ifications T
MIN
to T
MAX
unless otherwise noted.)
Parameter Min Typ Max Unit Test Conditions/Comments
RS-232 TRANSMITTERS
Output Voltage Swing ± 5 ± 9 V All Transmitter Outputs Loaded with
3 kΩ to Ground
Input Logic Threshold Low, V
INL
1.7 0.8 V T
IN
Input Logic Threshold High, V
INH
2.4 1.7 V T
IN
Logic Pull-Up Current 12 40 µAT
IN
= 0 V
Data Rate 200 kB/s
Output Resistance 300 Ω V
CC
= V+ = V– = 0 V, V
OUT
= ± 2 V
Output Short Circuit Current (Instantaneous) ± 10 mA
RS-232 RECEIVERS
RS-232 Input Voltage Range –30 +30 V
RS-232 Input Threshold Low 0.8 1.2 V
RS-232 Input Threshold High 1.6 2.4 V
RS-232 Input Hysteresis 0.2 0.4 1.0 V V
CC
= 5 V
RS-232 Input Resistance 3 5 7 kΩ T
A
= 0°C to 85°C
TTL/CMOS Output Voltage Low, V
OL
0.05 0.4 V I
OUT
= 3.2 mA
TTL/CMOS Output Voltage High, V
OH
3.5 V I
OUT
= –1.0 mA
TTL/CMOS Output Short-Circuit Current –2 –85 mA Source Current (V
OUT
= GND)*
TTL/CMOS Output Short-Circuit Current 10 35 mA Sink Current (V
OUT
= V
CC
)*
TTL/CMOS Output Leakage Current ± 0.05 ± 10 µA SHDN = GND/EN = V
CC
0 V ≤ V
OUT
≤ V
CC
EN Input Threshold Low, V
INL
1.4 0.8 V
EN Input Threshold High, V
INH
2.0 1.4 V
POWER SUPPLY
Power Supply Current 4 8 mA No Load
13 mA 3 kΩ Load on Both Outputs
Shutdown Power Supply Current 0.1 10 µA
SHDN Input Leakage Current ± 1 µA
SHDN Input Threshold Low, V
INL
1.4 0.8 V
SHDN Input Threshold High, V
INH
2.0 1.4 V
AC CHARACTERISTICS
Transition Region Slew Rate 3 8 30 V/µsC
L
= 50 pF to 1000 pF, R
L
= 3 kΩ to 7 kΩ
Measured from +3 V to –3 V or –3 V to +3 V
Transmitter Propagation Delay TTL to RS-232 0.85 3.5 µst
PHLT
1.0 3.5 µst
PLHT
Receiver Propagation Delay RS-232 to TTL 0.1 0.5 µst
PHLR
0.3 0.5 µst
PLHR
Receiver Output Enable Time 125 500 ns t
ER
Receiver Output Disable Time 160 500 ns t
DR
Transmitter Output Enable Time 250 µs SHDN Goes High
Transmitter Output Disable Time 3.5 µs SHDN Goes Low
Transmitter + to – Propagation Delay Difference 150 ns
Receiver + to – Propagation Delay Difference 200 ns
*Guaranteed by design, not production tested.
Specifications subject to change without notice.
B