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参数资料
| 型号： | ISL3330IAZ |
| 厂商： | Intersil |
| 文件页数： | 21/25页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 3.3V RS232/485 20-SSOP |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 66 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 3.15 V ~ 3.45 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
5
FN6361.0
May 20, 2008
Pin Descriptions
PIN
MODE
FUNCTION
485/232
BOTH
Interface Mode Select input. High for RS-485 Mode and low for RS-232 Mode.
DEN
BOTH
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DEN high. They are high impedance when DEN
is low.
GND
BOTH
Ground connection.
NC
BOTH
No Connection.
ON
BOTH
In RS-232 mode only, ON high enables the charge pumps. ON low, with DEN and RXEN low (and RXEN high if QFN), turns
off the charge pumps (in RS-232 mode), and in either mode places the device in low power shutdown. In both modes, when
ON is low, and DEN is high, and RXEN is high or RXEN is low, loopback is enabled.
RXEN
BOTH
Receiver output enable. Rx is enabled when RXEN is high; Rx is high impedance when RXEN is low and, if using the QFN
package, RXEN is high. When using the QFN and the active high Rx enable function, RXEN should be high or floating.
RXEN
BOTH
Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high and RXEN
is low. (i.e., to use active low Rx enable function, tie RXEN to GND). For single signal Tx/Rx direction control, connect RXEN
to DEN. Internally pulled high. (QFN only)
VCC
BOTH
System power supply input (3.3V).
VL
BOTH
Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. QFN logic input pins that are externally
tied high in an application, should use the VL supply for the high voltage level. (QFN only)
A
RS-232 Receiver input with ±15kV ESD protection. A low on A forces RA high; A high on A forces RA low.
RS-485 Inverting receiver input with ±15kV ESD protection.
B
RS-232 Receiver input with ±15kV ESD protection. A low on B forces RB high; A high on B forces RB low.
RS-485 Noninverting receiver input with ±15kV ESD protection.
DY
RS-232 Driver input. A low on DY forces output Y high. Similarly, a high on DY forces output Y low.
RS-485 Driver input. A low on DY forces output Y high and output Z low. Similarly, a high on DY forces output Y low and output Z high.
DZ/SLEW RS-232 Driver input. A low on DZ forces output Z high. Similarly, a high on DZ forces output Z low.
RS-485 Slew rate control. With the SLEW pin high, the drivers run at the maximum slew rate (20Mbps). With the SLEW pin low, the
drivers run at a reduced slew rate (460kbps). The QFN version works in conjunction with SPB to select one of three RS-485
data rates. Internally pulled high in RS-485 mode.
SPB
RS-485 Speed control. Works in conjunction with the SLEW pin to select the 20Mbps, 460kbps or 115kbps RS-485 data rate.
Internally pulled high. (QFN only)
RA
RS-232 Receiver output.
RS-485 Receiver output: If B > A by at least -40mV, RA is high; If B < A by -200mV or more, RA is low; RA = High if A and B are
unconnected (floating) or shorted together (i.e., full fail-safe).
RB
RS-232 Receiver output.
RS-485 Not used. Output is high impedance, and unaffected by RXEN and RXEN.
Y
RS-232 Driver output with ±15kV ESD protection.
RS-485 Inverting driver output with ±15kV ESD protection.
Z
RS-232 Driver output with ±15kV ESD protection.
RS-485 Noninverting driver output with ±15kV ESD protection.
C1+
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.
C1-
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.
C2+
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.
C2-
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.
V+
RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed in RS-485 Mode.
V-
RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed in RS-485 Mode.
ISL3330, ISL3331
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