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參數(shù)資料
| 型號(hào)： | ISL3241EIRZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 ESD-PROT 32-QFN |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN 裸露焊盤（5x5） |
| 包裝： | 管件 |
ISL3241E, ISL3243E
12
FN6768.2
June 18, 2012
additional system power savings without changes to the
existing operating system.
Automatic power-down operates when the FORCEON input is
low, and the FORCEOFF input is high. Tying FORCEON high
disables automatic power-down, but manual powerdown is
always available via the overriding FORCEOFF input. Table 2
summarizes the automatic power-down functionality.
The time to recover from automatic power-down mode is
typically 20s.
Capacitor Selection
The charge pumps require 0.1F, or greater, capacitors for
proper operation. Increasing the capacitor values (by a factor
of 2) reduces ripple on the transmitter outputs and slightly
reduces power consumption.
When using minimum required capacitor values, make sure
that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal
value. The capacitor’s equivalent series resistance (ESR)
usually rises at low temperatures and it influences the amount
of ripple on V+ and V-.
Power Supply Decoupling
In most circumstances a 0.1F bypass capacitor is adequate.
In applications that are particularly sensitive to power supply
noise, decouple VCC and VL to ground with a capacitor of the
same value as the charge-pump capacitor C1. Connect the
bypass capacitor as close as possible to the IC.
Transmitter Outputs when
Exiting Power-down
Figure 12 shows the response of two transmitter outputs when
exiting powerdown mode. As they activate, the two transmitter
outputs properly go to opposite RS-232 levels, with no
glitching, ringing, nor undesirable transients. Each transmitter
is loaded with 3k in parallel with 1000pF. Note that the
transmitters enable only when the magnitude of V+ and V-
exceeds approximately 3V.
Operation Down to 2.7V
ISL324xE transmitter outputs meet RS-562 levels (±3.7V), at
the full data rate, with VCC as low as 2.7V. RS-562 levels
typically ensure inter operability with RS-232 devices.
High Data Rates
The ISL324xE maintain the RS-232 ±5V minimum transmitter
output voltages even at high data rates. Figure 13 details a
transmitter loopback test circuit, and Figure 14 illustrates the
loopback test result at 120kbps. For this test, all transmitters
were simultaneously driving RS-232 loads in parallel with
1000pF, at 120kbps. Figure 15 shows the loopback results for
a single transmitter driving 1000pF and an RS-232 load at
250kbps. The static transmitters were also loaded with an
RS-232 receiver.
TIME (20s/DIV.)
T1
T2
2V/DIV.
5V/DIV.
VCC = +3.3V, VL = 1.8V
FORCEOFF
FIGURE 12. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
C1 TO C4 = 0.1F
FIGURE 13. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 14. LOOPBACK TEST AT 120kbps
ISL324xE
VL
FORCEOFF OR SHDN
C1
C2
C4
C3
+
1000pF
V+
V-
5k
Ω
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1F
VCC
FORCEON
VL
+
0.1F
VL
EN
T1IN
T1OUT
R1OUT
4s/DIV.
VCC = +3.3V, VL = 1.8V
3V/DIV.
C1 TO C4 = 0.1F
5V/DIV.
3V/DIV.
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