MAX3228E(2001) Просмотр технического описания (PDF) - Maxim Integrated
Номер в каталоге
Компоненты Описание
Список матч
MAX3228E Datasheet PDF : 15 Pages
| |||
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
Transmitter Outputs when
Exiting Shutdown
Figure 7 shows a transmitter output when exiting shut-
down mode. The transmitter is loaded with 3kΩ in par-
allel with 1000pF. The transmitter output displays no
ringing or undesirable transients as it comes out of
shutdown, and is enabled only when the magnitude of
V- exceeds approximately -3V.
High Data Rates
The MAX3228E/MAX3229E maintain the RS-232 ±5.0V
minimum transmitter output voltage even at high data
rates. Figure 8 shows a transmitter loopback test cir-
cuit. Figure 9 shows a loopback test result at 120kbps,
and Figure 10 shows the same test at 250kbps. For
Figure 9, the transmitter was driven at 120kbps into an
RS-232 load in parallel with 1000pF. For Figure 10, a
single transmitter was driven at 250kbps, and loaded
with an RS-232 receiver in parallel with 1000pF.
FORCEON =
FORCEOFF
5V/div
0
TOUT
2V/div
0
4µs/div
Figure 7. Transmitter Outputs Exiting Shutdown or Powering Up
VCC
VL
0.1µF
C1
C2
C1+
VCC
VL
V+
C1-
MAX3229E
C2+
V-
C2-
VL
T1IN
T1OUT
VL
R1OUT
R1IN
0.1µF
C3
C4
1000pF
5kΩ
FORCEON
INVALID
GND FORCEOFF
TO POWER-
MANAGEMENT UNIT
VL
5V
T_IN
0
5V
T_OUT
0
-5V
5V
R_OUT
0
4µs/div
Figure 9. Loopback Test Result at 120kbps
5V
T_IN
0
5V
T_OUT
0
-5V
5V
R_OUT
0
4µs/div
Figure 10. Loopback Test Result at 250kbps
Figure 8. Transmitter Loopback Test Circuit
______________________________________________________________________________________ 11
Share Link: 