參數(shù)資料
型號(hào)： MAX3244
廠商： Maxim Integrated Products, Inc.
英文描述： 32-Bit Digital Signal Controller with Flash 100-BGA MICROSTAR -40 to 125
中文描述： 1µA電源電流、1Mbps、3.0V至5.5V、RS-232收發(fā)器，提供AutoShutdown Plus
文件頁(yè)數(shù)： 12/20頁(yè)
文件大小： 235K
代理商： MAX3244
Table 3. Required Minimum Capacitance
Values
M
__________Applic ations Information
Capac itor S elec tion
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1μF capaci-
tors for 3.3V operation. For other supply voltages, see
Table 3 for required capacitor values. Do not use val-
ues smaller than those listed in Table 3. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1’s value.
However, do not increase C1
without also increasing the values of C2, C3, C4,
and C
BYPASS
, to maintain the proper ratios (C1 to
the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
Power-S upply Dec oupling
In most circumstances, a 0.1μF V
CC
bypass capacitor
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
T ransmitter Outputs
when Exiting S hutdown
Figure 6 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high; the other is low). Each
transmitter is loaded with 3k
in parallel with 1000pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3V.
High Data Rates
The MAX3224/MAX3226/MAX3244 maintain the RS-232
±5.0V minimum transmitter output voltage even at high
data rates. Figure 7 shows a transmitter loopback test
circuit. Figure 8 shows a loopback test result at
120kbps, and Figure 9 shows the same test at
250kbps. For Figure 8, all transmitters were driven
1μA S upply Current, 1Mbps, 3.0V to 5.5V,
RS -232 Transc eivers with AutoS hutdown Plus
12
______________________________________________________________________________________
V
CC
(V)
C2, C3, C4
(μF)
0.1
0.33
1
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
C1, C
BYPASS
(μF)
0.1
0.047
0.22
5
μ
s/div
T1OUT
FORCEON =
FORCEOFF
T2OUT
READY
5V/div
0
2V/div
0
5V/div
0
V
CC
= 3.3V
C1–C4 = 0.1
μ
F
Figure 6. Transmitter Outputs when Exiting Shutdown or
Powering Up
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
5k
R_ IN
R_ OUT
FORCEON
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3*
C1
C2
C
BYPASS
V
CC
FORCEOFF
*C3 CAN BE RETURNED TOV
CC
OR GND.
T_ OUT
T_ IN
GND
V
CC
1000pF
Figure 7. Loopback Test Circuit
相關(guān)PDF資料
PDF描述
MAX3245 32-Bit Digital Signal Controller with Flash 100-LQFP -40 to 125
MAX3245CAI LINE TRANSCEIVER|CMOS|3 DRIVER|5 RCVR|SSOP|28PIN|PLASTIC
MAX3245EAI LINE TRANSCEIVER|CMOS|3 DRIVER|5 RCVR|SSOP|28PIN|PLASTIC
MAX3228 +2.5V to +5.5V RS-232 Transceivers in UCSP
MAX3229EBV +2.5V to +5.5V RS-232 Transceivers in UCSP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3244CAI 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3244CAI+ 功能描述:RS-232接口集成電路 3-5.5V 1Mbps Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3244CAI+T 功能描述:RS-232接口集成電路 3-5.5V 1Mbps Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3244CAI-T 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3244CWI 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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