TRSF3238IDB

TRSF3238 3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER www.ti.com FEATURES • • • • • • • • • Auto-Powerdown Plus Operates With 3-V to 5.5-V VCC Supply Always-Active Noninverting Receiver Output (ROUT1B) Supports Operation From 250 kbit/s to 1 Mbit/s Low Standby Current . . . 1 μA Typical External Capacitors . . . 4 × 0.1 μF Accepts 5-V Logic Input With 3.3-V Supply Inter-Operable With TRSF3243 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 Printers SLLS859 – AUGUST 2007 DB, DW, OR PW PACKAGE (TOP VIEW) C2 + GND C2− V− DOUT1 DOUT2 DOUT3 RIN1 RIN2 DOUT4 RIN3 DOUT5 FORCEON FORCEOFF 1 28 2 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 C1+ V+ VCC C1− DIN1 DIN2 DIN3 ROUT1 ROUT2 DIN4 ROUT3 DIN5 ROUT1B INVALID DESCRIPTION/ORDERING INFORMATION The TRSF3238 device consists 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, this device includes an always-active noninverting output (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. This device operates at data signaling rate 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 approximately 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 occurs 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 when 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. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007, Texas Instruments Incorporated TRSF3238 3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER www.ti.com SLLS859 – AUGUST 2007 ORDERING INFORMATION PACKAGE (1) (2) TA SOIC – DW 0°C to 70°C SSOP – DB TSSOP – PW SOIC – DW –40°C to 85°C SSOP – DB TSSOP – PW (1) (2) ORDERABLE PART NUMBER Tube of 50 TRSF3238CDW Reel of 2000 TRSF3238CDWR Tube of 50 TRSF3238CDB Reel of 2000 TRSF3238CDBR Tube of 50 TRSF3238CPW Reel of 2000 TRSF3238CPWR Tube of 50 TRSF3238IDW Reel of 2000 TRSF3238IDWR Tube of 50 TRSF3238IDB Reel of 2000 TRSF3238IDBR Tube of 50 TRSF3238IPW Reel of 2000 TRSF3238IPWR TOP-SIDE MARKING TRS3238EC TRS3238EC RT38C TRS3238EI TRS3238EI RT38I Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. FUNCTION TABLES abc Each Driver (1) INPUTS DIN (1) FORCEON FORCEOFF TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION OUTPUT DOUT DRIVER STATUS X X L X Z Powered off L H H X H H H H X L Normal operation with auto-powerdown plus disabled L L H 30 s Z Normal operation with auto-powerdown plus enabled Powered off by auto-powerdown plus feature H = high level, L = low level, X = irrelevant, Z = high impedance Each Receiver (1) INPUTS RIN2 RIN1, RIN3–RIN5 L H FORCEOFF ROUT1B ROUT X L X L Z X L X H Z L L H