Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX3110ECWI+G36

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX3110E/MAX3111E combine a full-featured uni-

versal asynchronous receiver/transmitter (UART) with

±15kV ESD-protected RS-232 transceivers and inte-

grated charge-pump capacitors into a single 28-pin

package for use in space-, cost-, and power-con-

strained applications. The MAX3110E/MAX3111E also

feature an SPI™/QSPI™/MICROWIRE™-compatible

serial interface to save additional board space and

microcontroller (µC) I/O pins.

A proprietary low-dropout output stage enables the

2-driver/2-receiver interface to deliver true RS-232 per-

formance down to V

= +3V (+4.5V for MAX3110E)

while consuming only 600µA. The receivers remain

active in a hardware/software-invoked shutdown, allow-

ing external devices to be monitored while consuming

only 10µA. Each device is guaranteed to operate at up

to 230kbps while maintaining true EIA/TIA-232 output

voltage levels.

The MAX3110E/MAX3111E’s UART includes a crystal

oscillator and baud-rate generator with software-pro-

grammable divider ratios for all common baud rates

from 300baud to 230kbaud. The UART features an 8-

word-deep receive FIFO that minimizes processor over-

head and provides a flexible interrupt with four

maskable sources. Two control lines (one input and

one output) are included for hardware handshaking.

The UART and RS-232 functions can be used together

or independently since the two functions share only

supply and ground connections (the MAX3110E/

MAX3111E are hardware- and software-compatible

with the MAX3100 and MAX3222E).

________________________Applications

Point-of-Sale (POS) Devices

Handy-Terminals

Telecom/Networking Diagnostic Ports

Industrial Front-Panel Interfaces

Hand-Held/Battery-Powered Equipment

Features

♦ Integrated RS-232 Transceiver and UART in a

Single 28-Pin Package

♦ SPI/QSPI/MICROWIRE-Compatible µC Interface

♦ Internal Charge-Pump Capacitors—

No External Components Required!

♦ True RS-232 Operation Down to V

= +3V

(MAX3111E)

♦ ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ Single-Supply Operation

+5V (MAX3110E)

+3.3V (MAX3111E)

♦ Low Power

600µA Supply Current

10µA Shutdown Supply Current with

Receiver Interrupt Active

♦ Guaranteed 230kbps Data Rate

♦ Hardware/Software-Compatible with MAX3100

and MAX3222E

SPI/MICROWIRE-Compatible UART and ±15kV ESD-

Protected RS-232 Transceivers with Internal Capacitors

678

RS-232

DB-9

SCLK

SPI

DIN

DOUT

μP

12345

IRQ

MAX3110E

MAX3111E

19-1494; Rev 1; 12/05

Typical Application Circuit

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

Pin Configuration appears at end of data sheet.

†

Covered by U.S. Patent numbers 4,636,930; 4,679,134;

4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and

other patents pending.

PART

MAX3110ECWI

MAX3110ECNI 0°C to +70°C

0°C to +70°C

TEMP.

RANGE

PIN-

PACKAGE

28 Wide SO

28 Plastic DIP

(V)

MAX3110E/MAX3111E

Summary of content (31 pages)

PAGE 1
MAX3110E/MAX3111E LE AVAILAB SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors General Description Features The MAX3110E/MAX3111E combine a full-featured universal asynchronous receiver/transmitter (UART) with ±15kV ESD-protected RS-232 transceivers and integrated charge-pump capacitors into a single 28-pin package for use in space-, cost-, and power-constrained applications.
PAGE 2
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors ABSOLUTE MAXIMUM RATINGS Short-Circuit Duration X2, DOUT, IRQ (to VCC or GND).............................Continuous T_OUT (to GND) .....................................................Continuous Continuous Power Dissipation (TA = +70°C) 28-pin Wide SO (derate 12.5mW/°C above +70°C) ...........1W 28-pin Plastic DIP (derate 14.3mW/°C above +70°C) ....1.
PAGE 3
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors ELECTRICAL CHARACTERISTICS—MAX3110E (continued) (VCC = +4.5V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are measured for baud rate set to 9600baud at VCC = +5V, TA = +25°C.
PAGE 4
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors ELECTRICAL CHARACTERISTICS—MAX3110E (continued) (VCC = +4.5V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are measured for baud rate set to 9600baud at VCC = +5V, TA = +25°C.
PAGE 5
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors ELECTRICAL CHARACTERISTICS—MAX3111E (VCC = +3.0V to +3.6V, VA = TMIN to TMAX, unless otherwise noted. Typical values are measured for baud rate set to 9600baud at VCC = +3.3V, TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = 3.3V, TA = +25°C) ICC SHDN = VCC, no load 0.45 1.
PAGE 6
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors ELECTRICAL CHARACTERISTICS—MAX3111E (continued) (VCC = +3.0V to +3.6V, VA = TMIN to TMAX, unless otherwise noted. Typical values are measured for baud rate set to 9600baud at VCC = +3.3V, TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS RS-232 RECEIVER OUTPUTS (R_OUT) Output High Voltage VOH1 ISOURCE = 1mA Output Low Voltage VOL1 ISINK = 1.6mA VCC - 0.6 V 0.
PAGE 7
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors ELECTRICAL CHARACTERISTICS—MAX3111E (continued) (VCC = +3.0V to +3.6V, VA = TMIN to TMAX, unless otherwise noted. Typical values are measured for baud rate set to 9600baud at VCC = +3.3V, TA = +25°C.
PAGE 8
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) UART SHUTDOWN CURRENT vs. TEMPERATURE SHUTDOWN CURRENT (μA) 600 500 MAX3110E, VCC = +5V 400 300 MAX3111E, VCC = +3.3V 4 MAX3111E, VCC = +3.
PAGE 9
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Pin Description PIN NAME 1 R2IN 2 R2OUT RS-232 Receiver Output 2, TTL/CMOS 3 T2IN RS-232 Transmitter lnput 2, TTL/CMOS 4 T1IN RS-232 Transmitter lnput 1, TTL/CMOS 5 R1OUT RS-232 Receiver Output 1, TTL/CMOS 6 R1IN 7 T1OUT 8 VCC 9 X2 UART Crystal Connection. Leave X2 unconnected when using an external CMOS clock.
PAGE 10
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors T2IN T2OUT T1IN T1OUT R2OUT R2IN R1OUT R1IN V+ C1+ INTERNAL INTERNAL C1C2+ 5k 5k CHARGE PUMP GND INTERNAL INTERNAL C2- V- VCC SHDN Pr RX BUFFER MAX3110E/MAX3111E 9 9 9 Pr RX 9 RX SHIFT REGISTER Pr X2 DOUT 4 SPI INTERFACE TX SHIFT REGISTER Pt IRQ 9 BAUD-RATE GENERATOR X1 TX INTERRUPT LOGIC RX FIFO SCLK CS 9 TX BUFFER Pt CTS RTS 9 DIN I/O Figure 1.
PAGE 11
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors SPI Interface The MAX3110E/MAX3111E are compatible with SPI, QSPI (CPOL = 0, CPHA = 0), and MICROWIRE serialinterface standards (Figure 2). The MAX3110E/ MAX3111E have a unique full-duplex-only architecture that expects a 16-bit word for DIN and simultaneously produces a 16-bit word for DOUT regardless of which read/write register is used.
PAGE 12
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors DATA UPDATED CS SCLK 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DIN 1 1 FEN SHDN TM RM PM RAM IR ST PE L B3 B2 B1 B0 DOUT R T 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IDLE Figure 4.
PAGE 13
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 1. Bit Descriptions BIT NAME BIT TYPE POR STATE B0–B3 write 0000 Baud-Rate Divisor Select Bits. Sets the baud clock’s value (Table 6). B0–B3 read 0000 Baud-Rate Divisor Select Bits. Reads the 4-bit baud clock value assigned to these registers. CTS read No change D0t–D7t write XXXXXXXX Transmit-Buffer Register. Eight data bits written into the transmit-buffer register.
PAGE 14
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 1. Bit Descriptions (continued) BIT NAME RA/FE SHDNi BIT TYPE read write POR STATE DESCRIPTION 0 Receiver-Activity/Framing-Error Bit. In shutdown mode, this is the RA bit. In normal operation, this is the FE bit. In shutdown mode, a transition on RX sets RA = 1. In normal mode, a framing error sets FE = 1.
PAGE 15
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Write Configuration Register (D15, D14 = 1, 1) Configure the UART by writing a 16-bit word to the write configuration register, which programs the baud rate, data word length, parity enable, and enable of the 8word receive FIFO. In this mode, bits 15 and 14 of the DIN configuration word are both required to be 1 in order to enable the write configuration mode.
PAGE 16
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 2. Write Configuration (D15, D14 = 1, 1) BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DIN 1 1 FEN SHDNi TM RM PM RAM IR ST PE L B3 B2 B1 B0 DOUT R T 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D15 is present at DOUT on CS’s falling edge. Consecutive bits are clocked out on SCLK’s falling edge.
PAGE 17
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 3. Read Configuration (D15, D14 = 0, 1) BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DIN 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 TEST DOUT R T FEN SHDNo TM RM PM RAM IR ST PE L B3 B2 B1 B0 D15 is present at DOUT on CS’s falling edge. Consecutive bits are clocked out on SCLK’s falling edge.
PAGE 18
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 4. Write Data (D15, D14 = 1, 0) BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DIN 1 0 0 0 0 TE RTS Pt D7t D6t D5t D4t D3t D2t D1t D0t DOUT R T 0 0 0 RA/FE CTS Pr D7r D6r D5r D4r D3r D2r D1r D0r D15 is present at DOUT on CS’s falling edge. Consecutive bits are clocked out on SCLK’s falling edge.
PAGE 19
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 5. Read Data (D15, D14 = 0, 0) BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DIN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 DOUT R T 0 0 0 RA/FE CTS Pr D7r D6r D5r D4r D3r D2r D1r D0r D15 is present at DOUT on CS’s falling edge. Consecutive bits are clocked out on SCLK’s falling edge.
PAGE 20
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Baud-Rate Generator The baud-rate generator determines the rate at which the transmitter and receiver operate. Bits B3–B0 in the write configuration register determine the baud-rate divisor (BRD), which divides the X1 oscillator frequency. The on-board oscillator operates with either a 1.8432MHz or a 3.6864MHz crystal or is driven at X1 with a 45% to 55% duty-cycle square wave.
PAGE 21
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 7. Interrupt Sources and Masks—Bit Descriptions BIT NAME MASK BIT MEANING WHEN SET DESCRIPTION Pr PM Received parity bit = 1 The Pr bit reflects the value in the word currently in the receive-buffer register (oldest data available). The Pr bit is set when parity is enabled (PE = 1) and the received parity bit is 1.
PAGE 22
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors RS-232 Transmitters The transmitters are inverting-level translators that convert CMOS-logic levels to ±5.0V EIA/TIA-232 levels. The transmitters guarantee a 230kbps data rate with worstcase loads of 3kΩ in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).
PAGE 23
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 Figure 8a. Human Body ESD Test Model TIME tRL tDL CURRENT WAVEFORM Figure 8b.
PAGE 24
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Ceramic resonators are low-cost alternatives to crystals and operate similarly, although the Q and accuracy are lower. Some ceramic resonators are available with integral load capacitors, which can further reduce cost. The tradeoff between crystals and ceramic resonators is in initial-frequency accuracy and temperature drift.
PAGE 25
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors High Data Rates Interconnection with 3.3V and 5V Logic The MAX3110E/MAX3111E maintain the RS-232 ±5.0V minimum transmitter output-voltage specification even at the highest guaranteed data rate. Figure 10 shows a transmitter loopback test circuit. Figure 11 shows a loopback test result at 120kbps, and Figure 12 shows the same test at 250kbps.
PAGE 26
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Table 9. Logic-Family Compatibility with Various Supply Voltages LOGIC POWER-SUPPLY VOLTAGE (V) VCC SUPPLY VOLTAGE (V) COMPATIBILITY 5 (MAX3110E) 5 Compatible with all TTL and CMOS families 3.3 (MAX3111E) 3.3 Compatible with all CMOS families 3.
PAGE 27
MAX3110E/MAX3111E SIR IrDA Mode The MAX3110E/MAX3111E’s IrDA mode can be used to communicate with other IrDA SIR-compatible devices or to reduce power consumption in opto-isolated applications. In IrDA mode, a bit period is shortened to 3/16 of a baud period (1.61µs at 115,200 baud). A data zero is transmitted as a pulse of light (TX pin = logic low, RX pin = logic high), as shown in Figure 15. In receive mode, the RX signal’s sampling is done halfway into the transmission of a high level.
PAGE 28
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Listing 1. Outline for a MAX3110E/MAX3111E Software Driver This is a C-language outline of an interrupt-driven software driver that interfaces to a MAX3110E/MAX3111E, providing an intermediate layer between the bit-manipulation subroutine and the familiar PutChar / GetChar subroutines.
PAGE 29
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Listing 1. Outline for a MAX3110E/MAX3111E Software Driver (continued) /* This driver needs a txqueue transmit-data queue and a rxqueue receive-data queue. ** These can be ring buffers or any other kind of first-in, first-out data queue.
PAGE 30
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Ordering Information (continued) PART TEMP. RANGE PINPACKAGE TOP VIEW VCC (V) MAX3110EEWI -40°C to +85°C MAX3110EENI -40°C to +85°C 28 Wide SO 28 Plastic DIP 5 5 MAX3111ECWI 28 Wide SO 28 Plastic DIP 28 Wide SO 28 Plastic DIP 3.3 3.3 3.3 3.
PAGE 31
MAX3110E/MAX3111E SPI/MICROWIRE-Compatible UART and ±15kV ESDProtected RS-232 Transceivers with Internal Capacitors Revision History REVISION NUMBER REVISION DATE 0 7/99 1 12/05 DESCRIPTION PAGES CHANGED Initial release. — Added the soldering temperature to the Absolute Maximum Ratings. 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.