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參數(shù)資料
| 型號： | ISL83239EIV-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 【15kV ESD Protected, 10nA Supply- Current, 3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 567K |
| 代理商： | ISL83239EIV-T |
6
Detailed Description
The ISL83239E operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1
μ
F (0.22
μ
F for V
CC
= 3.0V) capacitors,
features low power consumption, and meets all EIA/TIA-232
and V.28 specifications. The circuit is divided into three
sections: The charge pump, the transmitters, and the
receivers.
Charge-Pump
Intersil’s new 3V RS-232 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.
All 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.
The ISL83239E guarantees a 250Kbps 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, C
1-4
= 0.1
μ
F, R
L
= 3k
, and
C
L
= 250pF, one transmitter easily operates at 1Mbps.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases. Connect unused inputs to GND for the best
performance.
Receivers
The ISL83239E contains standard inverting receivers that
tristate when the SHDN control line is driven low.
Additionally, it includes a noninverting (monitor) receiver
(denoted by the R
OUTB
label) that is always active,
regardless of the state of any control lines. All the receivers
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.
Monitor receivers remain active even during manual
powerdown, making them 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.
Powerdown Functionality
This 3V device requires a nominal supply current of 0.3mA
during normal operation (not in powerdown mode). This is
considerably less than the 5mA to 11mA current required of
5V RS-232 devices. The already low current requirement
drops significantly when the device enters powerdown
mode. In powerdown, supply current drops to 10nA,
because the on-chip charge pump turns off (V+ collapses to
V
CC
, V- collapses to GND), and the transmitter outputs
tristate. This micro-power mode makes the ISL83239E ideal
for battery powered and portable applications.
Software Controlled (Manual) Powerdown
On the ISL83239E, the powerdown control is via a simple
shutdown (SHDN) pin. Driving this pin high enables normal
operation, while driving it low forces the IC into it’s
powerdown state. Connect SHDN to V
CC
if the powerdown
function isn’t needed. Note that all the transmitter and
receiver outputs tri-state during shutdown (see Table 2). The
time required to exit powerdown, and resume transmission is
only 100
μ
s.
R
XOUT
GND
≤
V
ROUT
≤
V
CC
5k
R
XIN
-25V
≤
V
RIN
≤
+25V
GND
V
CC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
TABLE 2. POWERDOWN LOGIC TRUTH TABLE
SHDN INPUT
L
H
TRANSMITTER OUTPUTS
High-Z
Active
RECEIVER OUTPUTS
High-Z
Active
R
OUTB
OUTPUT
Active
Active
MODE OF OPERATION
Manual Powerdown
Normal Operation
ISL83239E
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