Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS232 3/5 SOIC 28 W

_______________General Description

The MAX214 +5V RS-232 transceiver provides a com-

plete, 8-line, software-configurable, DTE or DCE port

RS-232 interface. Tx, Rx, RTS, CTS, DTR, DSR, DCD,

and RI circuits can be configured as either Data

Terminal Equipment (DTE) or Data Circuit-Terminating

Equipment (DCE) using the DTE/DCE control pin. The

MAX214 eliminates the need to swap cables when

switching between DTE and DCE configurations.

________________________Applications

AT-Compatible Laptop Computers

AT-Compatible Desktop Computers

Modems, Printers, and Other Peripherals

____________________________Features

♦ Eliminates Null Modem Cables

♦ Programmable DTE or DCE Serial Port

♦ 1µF Charge-Pump Capacitors

♦ 116kbps Data Rate—Guaranteed

♦ 20µA Shutdown Mode

♦ Receivers Active in Shutdown

______________Ordering Information

* Dice are specified at T

= +25°C.

MAX214

Programmable DTE/DCE,

+5V RS-232 Transceiver

________________________________________________________________

Maxim Integrated Products

TOP VIEW

MAX214

C1-

C1+

SHDN

DTE/DCE

TRB

RTB

TRC

RTC

V+

C2+

C2-

HI-Z

N.C.

RDC

TRA

RTA

RDTC

RRE

GND

V-

DIP/SO

__________________Pin Configuration

RTA

TRA

TRB

RTB

TRC

RTC

RDTC

RRE

C1+

C1-

C2+

C2-

V+

V-

GND

1µF

+5V

DTE

DCE

DTE

DCE

DTE

DCE

DTEDTE

DCE

DTE/DCE

SHDN

HI-Z

RDC

DCE

MAX214

1µF

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

PART TEMP. RANGE PIN-PACKAGE

MAX214CPI 0°C to +70°C 28 Plastic DIP

MAX214CWI 0°C to +70°C 28 Wide SO

MAX214C/D 0°C to +70°C Dice*

MAX214EPI -40°C to +85°C 28 Plastic DIP

MAX214EWI -40°C to +85°C 28 Wide SO

19-0199; Rev 1; 8/95

Summary of content (12 pages)

PAGE 1
9-0199; Rev 1; 8/95 Programmable DTE/DCE, +5V RS-232 Transceiver ____________________________Features ♦ Eliminates Null Modem Cables ________________________Applications ♦ Receivers Active in Shutdown AT-Compatible Laptop Computers ♦ Programmable DTE or DCE Serial Port ♦ 1µF Charge-Pump Capacitors ♦ 116kbps Data Rate—Guaranteed ♦ 20µA Shutdown Mode ______________Ordering Information AT-Compatible Desktop Computers PART Modems, Printers, and Other Peripherals __________Typical Operating Circuit +5
PAGE 2
MAX214 Programmable DTE/DCE, +5V RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................-0.3V to +6V Input Voltages TIN, DTE/DCE, SHDN HI-Z ......................-0.3V to (VCC + 0.3V) RIN ....................................................................................±15V Output Voltages: TOUT ..................................................................................±15V ROUT ....................................................
PAGE 3
Programmable DTE/DCE, +5V RS-232 Transceiver (VCC = 4.5V to 5.5V, C1 to C4 = 1µF, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS POWER SUPPLY VCC Supply Current Shutdown Supply Current No load, TA = +25°C DTE/DCE = 0V, SHDN = HI-Z = VCC , Figure 1 TA = +25°C 9 20 mA 4 20 µA 50 TA = TMIN to TMAX CONTROL LOGIC (DTE/DCE, SHDN, HI-Z) Logic Input Threshold Low 0.8 Logic Input Threshold High 1.3 1.3 Input Leakage Current V 2.
PAGE 4
__________________________________________Typical Operating Characteristics (VCC = 5V, C1 to C4 = 1µF, all transmitters loaded with 3kΩ in parallel with 2.5nF, TA = +25°C, unless otherwise noted.) TRANSMITTER OUTPUT VOLTAGE (VOH) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES -6.0 20kbps 7.4 120kbps 7.2 64kbps V OH (V) -7.0 V OH (V) 6.8 120kbps 6.6 8.0 7.5 6.4 20kbps 7.0 6.2 DATA RATE = 0kbps 6.0 -8.5 0 6.
PAGE 5
Programmable DTE/DCE, +5V RS-232 Transceiver PIN NAME FUNCTION 1, 2 C2+, C2- 3 HI-Z RS-232 receiver impedance control. Take high to disconnect the termination resistor. 4 N.C.
PAGE 6
Table 1a. DTE-Operation Pin Configurations TTL/CMOS I/O LABEL MAX214 PIN FUNCTION MAX214 PIN RS-232 I/O LABEL DB-25 PIN INPUT THRESHOLD Transmitter (TxD) 5 9 TxD 2 Receiver (RxD) 6 10 RxD 3 Request to Send (RTS) 25 20 RTS 4 Clear to Send (CTS) 23 19 CTS 5 Data Terminal Ready (DTR) 24 18 DTR 20 Data Set Ready (DSR) 22 17 DSR 6 - Detector Carrier Data (DCD) 7 11 DCD 8 + Ring Indicator (RI) 8 12 RI 22 + - + Table 1b.
PAGE 7
Programmable DTE/DCE, +5V RS-232 Transceiver ISHDN +5.5V 1µF 1µF VCC C1+ 1µF V+ 1µF C1- MAX214 V- C2+ +5V 1µF C2- 400k Tx TIN +5.5V 3k Rx ROUT 0V OR +5.5V DRIVE TOUT RIN 5k DTE/DCE +5.5V HI-Z +5.5V SHDN +5.5V GND RS-232 Receivers CAPACITORS MAY BE POLARIZED OR UNPOLARIZED The receivers convert the RS-232 signals to CMOS-logic levels. They invert, to match the inversion of RS-232 drivers.
PAGE 8
MAX214 Programmable DTE/DCE, +5V RS-232 Transceiver Table 2.
PAGE 9
Programmable DTE/DCE, +5V RS-232 Transceiver pump capacitor sizes up to 10µF reduces the impedance of the V+ and V- outputs. High Data Rates The MAX214 maintains the RS-232 ±5.0V minimum driver output voltage even at high data rates. The Typical Operating Characteristics show transmitter output voltage levels driving 3kΩ in parallel with various capacitive loads at data rates up to 120kbps. To reduce the output impedance at V+ and V-, use larger capacitors (up to 10µF).
PAGE 10
MAX214 Programmable DTE/DCE, +5V RS-232 Transceiver STANDARD RS-232 CABLE PC1 (DTE MODE) PC2 (DCE MODE) 5 TA TRA 9 3 TxD 3 9 TRA TA 5 6 RA RTA 10 2 RxD 2 10 RTA RA 6 25 TB TRB 20 7 RTS 7 20 TRB TB 25 23 RB RTB 19 8 CTS 8 19 RTB RB 23 24 TC TRC 18 4 DTR 4 18 TRC TC 24 22 RC RTC 17 6 DSR 6 17 RTC RC 22 RDTC 11 1 DCD 1 11 RDTC RRE 12 9 RI 9 12 RRE 7 RDC 8 RE RDC 7 MAX214 MAX214 RE 8 HIGH HIGH HI-Z SHDN 3 26 DTE/DCE 21 D
PAGE 11
Programmable DTE/DCE, +5V RS-232 Transceiver EIA/TIA-232E, V.28 SPECIFICATIONS PARAMETER CONDITIONS Driver Output Voltage 0 Level 1 Level Output Level, Max 3kΩ to 7kΩ load +5.0V to +15V 3kΩ to 7kΩ load -5.0V to -15V No load ±25V 3kΩ ≤ RL ≤ 7kΩ, CL ≤ 2500pF Up to 20kbits/sec Data Rate Receiver Input Voltage 0 Level 1 Level Input Level, Max Instantaneous Slew Rate, Max Driver Output Resistance HI-Z C2- C1C2+ C1+ SHDN TB TA TC RA RB RDC RC +3.0V to +15V 0.178" 4.52mm RE -3.
PAGE 12
MAX214 Programmable DTE/DCE, +5V RS-232 Transceiver ________________________________________________________Package Information DIM D1 A A1 A2 A3 B B1 C D D1 E E1 e eA eB L α E A2 A3 E1 D A α A1 e C L eA B1 eB B DIM E A A1 B C D E e H h L α H INCHES MAX MIN 0.200 – – 0.015 0.175 0.125 0.080 0.055 0.020 0.016 0.065 0.045 0.012 0.008 1.470 1.430 0.090 0.050 0.625 0.600 0.575 0.525 0.100 BSC 0.600 BSC 0.700 – 0.150 0.125 15˚ 0˚ MILLIMETERS MIN MAX – 5.08 0.38 – 3.18 4.45 1.40 2.03 0.