SN75C3238 3-V To 5.5-V Multichannel RS-232 Line Driver/Receiver | TI.com

SN75C3238 (ACTIVE)

3-V To 5.5-V Multichannel RS-232 Line Driver/Receiver

3-V To 5.5-V Multichannel RS-232 Line Driver/Receiver - SN75C3238
Datasheet
 

Recommended alternative parts

  • TRSF3238E  -  The commercial temp device has the SAME FUNCTIONALITY/PINOUT as the compared device but includes enhanced IEC61000-4-2 ESD Protection.

Description

The ’C3238 devices consist of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, these devices include an always-active noninverting output (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. These devices operate at data signaling rates up to 1 Mbit/s, and at an increased slew-rate range of 24 V/µs to 150 V/µs.

Flexible control options for power management are featured when the serial-port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF\ is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for 30 s, the built-in charge-pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus will occur if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and FORCEOFF\ are high. With auto-powerdown plus enabled, the device automatically activates once a valid signal is applied to any receiver or driver input. INVALID\ is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V or has been between –0.3 V and 0.3 V for less than 30 µs. INVALID\ is low (invalid data) if all receiver input voltages are between –0.3 V and 0.3 V for more than 30 µs. Refer to Figure 5 for receiver input levels.

Features

  • Auto-powerdown Plus
  • Operate With 3-V to 5.5-V VCC Supply
  • Always-Active Noninverting Receiver Output (ROUT1B)
  • Support Operation From 250 kbit/s to 1 Mbit/s
  • Low Standby Current ...1 µA Typical
  • External Capacitors ...4 × 0.1 µF
  • Accept 5-V Logic Input With 3.3-V Supply
  • Inter-Operable With SN65C3243, SN75C3243
  • RS-232 Bus-Pin ESD Protection Exceeds ±15-kV Using Human-Body Model (HBM)
  • Applications
    • Battery-Powered Systems, PDAs, Notebooks, Subnotebooks, Laptops, Palmtop PCs, Hand-Held Equipment, Modems, and Printers

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Parametrics Compare all products in RS-232

 
Drivers per package
Receivers per package
Logic voltage (Min) (V)
Data rate (Max) (kbps)
Main supply voltage (Nom) (V)
Features
ESD HBM (kV)
Rating
Operating temperature range (C)
Package Group
SN75C3238 SN65C3238
5     5    
3     3    
3.3     3.3    
1000     1000    
3.3
5    
3.3
5    
Auto-Powerdown Plus     Auto-Powerdown Plus    
15     15    
Catalog     Catalog    
0 to 70     -40 to 85    
SOIC | 28
SSOP | 28
TSSOP | 28    
SOIC | 28
SSOP | 28
TSSOP | 28