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參數(shù)資料
| 型號(hào)： | ICL3245CA |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, MO-150AH, SSOP-28 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大?。?/td> | 461K |
| 代理商： | ICL3245CA |
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Detailed Description
These ICL32XX interface ICs operate from a single +3V to
+5.5V supply, guarantee a 1Mbps minimum data rate,
require only four small external 0.1
μ
F capacitors, feature low
power consumption, and meet all ElA RS-232C and V.28
specifications. The circuit is divided into three sections: The
charge pump, the transmitters, and the receivers.
Charge-Pump
Intersil’s new ICL32XX family utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate
±
5.5V transmitter supplies from a V
CC
supply as
low as 3.0V. This allows these devices to maintain RS-232
compliant output levels over the
±
10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1
μ
F capacitors for the
voltage doubler and inverter functions at V
CC
= 3.3V. See
the “Capacitor Selection” section, and Table 3 for capacitor
recommendations for other operating conditions. The charge
pumps operate discontinuously (i.e., they turn off as soon as
the V+ and V- supplies are pumped up to the nominal
values), resulting in significant power savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip
±
5.5V supplies, these
transmitters deliver true RS-232 levels over a wide range of
single supply system voltages.
Transmitter outputs disable and assume a high impedance
state when the device enters the powerdown mode (see
Table 2). These outputs may be driven to
±
12V when
disabled.
All devices guarantee a 1Mbps data rate for full load
conditions (3k
and 250pF), V
CC
≥
3.0V, with one
transmitter operating at full speed. Under more typical
conditions of V
CC
≥
3.3V, R
L
= 3k
, and C
L
= 250pF, one
transmitter easily operates at 1.4Mbps. Transmitter skew is
extremely low on these devices, and is specified at the
receiver input trip points (1.4V), rather than the arbitrary 0V
crossing point typical of other RS-232 families.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases. Connect unused inputs to GND for the best
performance.
Receivers
All the ICL32XX devices contain standard inverting
receivers, but only the ICL3245 receivers can three-state, via
the FORCEOFF control line. Additionally, the ICL3245
includes a noninverting (monitor) receiver (denoted by the
R
OUTB
label) that is always active, regardless of the state of
any control lines. Both receiver types convert RS-232 signals
to CMOS output levels and accept inputs up to
±
25V while
presenting the required 3k
to 7k
input impedance (see
Figure 1) even if the power is off (V
CC
= 0V). The receivers’
Schmitt trigger input stage uses hysteresis to increase noise
immunity and decrease errors due to slow input signal
transitions.
The ICL3245 inverting receivers disable during forced
(manual) powerdown, but not during automatic powerdown
(see Table 2). Conversely, the monitor receiver remains
active even during manual powerdown making it extremely
useful for Ring Indicator monitoring. Standard receivers
driving powered down peripherals must be disabled to
prevent current flow through the peripheral’s protection
diodes (see Figures 2 and 3). This renders them useless for
wake up functions, but the corresponding monitor receiver
can be dedicated to this task as shown in Figure 3.
R
XOUT
GND
≤
V
ROUT
≤
V
CC
5k
R
XIN
-25V
≤
V
RIN
≤
+25V
GND
V
CC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
OLD
V
CC
POWERED
DOWN
UART
GND
SHDN = GND
V
CC
Rx
Tx
V
CC
CURRENT
FLOW
V
OUT
=
V
CC
RS-232 CHIP
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
ICL3245
TRANSITION
DETECTOR
R
X
T
X
R2
OUTB
R2
OUT
T1
IN
FORCEOFF = GND
V
CC
V
CC
TO
R2
IN
T1
OUT
V
OUT
=
HI-Z
POWERED
DOWN
UART
WAKE-UP
LOGIC
ICL3225, ICL3245
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