MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
V
CC
5V/div
T1IN
0.1μF
V
5V/div
5V/div
T1OUT
R1OUT
CC
C1+
V+
V-
C3
C4
C1
C1-
C2+
MAX3222
MAX3232
MAX3237
MAX3241
C2
C2-
5μs/div
V
CC
= 3.3V
T_ OUT
T_ IN
Fiꢆꢀꢁe 65 MAX3241 Lꢃꢃꢄback Teꢂt Reꢂꢀot at 12.kbꢄꢂ
R_ IN
R_ OUT
EN*
5kΩ
0V
1000pF
5V/div
T1IN
V
CC
SHDN*
GND
5V/div
5V/div
T1OUT
R1OUT
*MAX3222/MAX3237/MAX3241 ONLY
Fiꢆꢀꢁe ±5 Lꢃꢃꢄback Teꢂt Ciꢁcꢀit
2μs/div
V
CC
= 3.3V
Fiꢆꢀꢁe 75 MAX3241 Lꢃꢃꢄback Teꢂt Reꢂꢀot at 23±kbꢄꢂ
High Data Rates
The MAX3222/MAX3232/MAX3241 maintain the RS-232
±±5.0 minimꢀm tꢁanꢂmitteꢁ ꢃꢀtꢄꢀt ꢅꢃotaꢆe eꢅen at hiꢆh
data ꢁateꢂ5 Fiꢆꢀꢁe ± ꢂhꢃwꢂ a tꢁanꢂmitteꢁ oꢃꢃꢄback teꢂt
ciꢁcꢀit5 Fiꢆꢀꢁe 6 ꢂhꢃwꢂ a oꢃꢃꢄback teꢂt ꢁeꢂꢀot at
12.kbꢄꢂ, and Fiꢆꢀꢁe 7 ꢂhꢃwꢂ the ꢂame teꢂt at 23±kbꢄꢂ5
Fꢃꢁ Fiꢆꢀꢁe 6, aoo tꢁanꢂmitteꢁꢂ weꢁe dꢁiꢅen ꢂimꢀotaneꢃꢀꢂoy
at 12.kbꢄꢂ intꢃ RS-232 oꢃadꢂ in ꢄaꢁaooeo with 1...ꢄF5
Fꢃꢁ Fiꢆꢀꢁe 7, a ꢂinꢆoe tꢁanꢂmitteꢁ waꢂ dꢁiꢅen at 23±kbꢄꢂ,
and aoo tꢁanꢂmitteꢁꢂ weꢁe oꢃaded with an RS-232 ꢁeceiꢅeꢁ
in ꢄaꢁaooeo with 1...ꢄF5
+5V
T_IN
0V
+5V
T_OUT = R_IN
5kΩ + 250pF
0V
-5V
+5V
0V
The MAX3237 maintainꢂ the RS-232 ±±5.0 minimꢀm
tꢁanꢂmitteꢁ ꢃꢀtꢄꢀt ꢅꢃotaꢆe at data ꢁateꢂ ꢀꢄ tꢃ 1Mbꢄꢂ5
Fiꢆꢀꢁe 8 ꢂhꢃwꢂ a oꢃꢃꢄback teꢂt ꢁeꢂꢀot at 1Mbꢄꢂ with
MBAUD = 0 5 Fꢃꢁ Fiꢆꢀꢁe 8, aoo tꢁanꢂmitteꢁꢂ weꢁe
CC
oꢃaded with an RS-232 ꢁeceiꢅeꢁ in ꢄaꢁaooeo with 2±.ꢄF5
R_OUT
150pF
200ns/div
V
= 3.3V
CC
Fiꢆꢀꢁe 85 MAX3237 Lꢃꢃꢄback Teꢂt Reꢂꢀot at 1...kbꢄꢂ
(MBAUD = 0
)
CC
Maxim Integrated
11
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
