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MAX3320TEAP+ Datasheet

  • MAX3320TEAP+

  • RS-232 Transceiver IC; Device Type:Line Driver/Receiver; No....

  • 12頁

  • Maxim   Maxim

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上傳產品規(guī)格書

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3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4碌A AutoShutdown Plus and Power-On Reset
MAX3320A/B/L/T
V
CC
2V/div
FORCEON =
FORCEOFF
T2OUT
MAX3320
V
CC
GND
RESET
2V/div
100k
T1OUT
Figure 4. Ensuring
RESET
Valid to V
CC
= 0V
V
CC
= 3.3V
C1 - C4 = 0.1碌F
5碌s/div
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperatures outside the 0擄C to +70擄C
range. If in doubt, use capacitors with a larger nominal
value. The capacitor's equivalent series resistance
(ESR), which usually rises at low temperatures, influ-
ences the amount of ripple on V+ and V-.
Figure 5. Transmitter Outputs when Exiting Shutdown or
Powering Up
V
CC
C1+
C1
C1-
C2+
C2
C2-
V
CC
V+
C3*
Transmitter Outputs
when Exiting Shutdown
Figure 5 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs go to opposite RS-232 levels (one trans-
mitter input is high; the other is low). Each transmitter is
loaded with 3k鈩?in parallel with 2500pF. The transmitter
outputs display no ringing or undesirable transients as
they exit shutdown. Note that the transmitters are
enabled only when the magnitude of V- exceeds
approximately 3V.
MAX3320
V-
C4
T_ IN
T_ OUT
R_ OUT
R_ IN
5k
High Data Rates
The MAX3320 maintains the RS-232 鹵5V minimum
transmitter output voltage even at high data rates.
Figure 6 shows a transmitter loop-back test circuit.
Figure 7 shows a loop-back test result at 120kbps, and
Figure 8 shows the same test at 250kbps. For Figure 7,
both transmitters were driven simultaneously at
120kbps into RS-232 loads in parallel with 1000pF. For
Figure 8, a single transmitter was driven at 250kbps,
and both transmitters were loaded with an RS-232
receiver in parallel with 1000pF.
V
CC
FORCEON
FORCEOFF
1000pF
GND
*C3 CAN BE RETURNED TO
V
CC
OR GND.
Figure 6. Loop-Back Test Circuit
Interconnection with 3V and 5V Logic
The MAX3320 can directly interface with various 5V
logic families, including ACT and HCT CMOS. See
Table 4 for more information on possible combinations
of interconnections.
Table 3. Required Minimum
Capacitance Values
V
CC
(V)
3 to 3.6
4.5 to 5.5
3 to 5.5
C1
(碌F)
0.1
0.047
0.1
C2, C3, C4, C
BYPASS
(碌F)
0.1
0.33
0.47
_______________________________________________________________________________________
9

MAX3320TEAP+ 產品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 66

  • 集成電路 (IC)

  • 接口 - 驅動器，接收器，收發(fā)器

  • -

  • 收發(fā)器

  • 2/2

  • RS232

  • 3 V ~ 5.5 V

  • 表面貼裝

  • 20-SSOP（0.209"，5.30mm 寬）

  • 20-SSOP

  • 管件

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