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________________General Description

The MAX3316E–MAX3319E are 2.5V powered RS-232

compatible transceivers. These devices feature shut-

down (MAX3317E), AutoShutdown Plus™ (MAX3318E/

MAX3319E), and enhanced electrostatic discharge

(ESD) protection integrated into the chip. All transmitter

outputs and receiver inputs are protected to ±15kV

using the IEC 1000-4-2 Air-Gap Discharge method,

±8kV using the IEC 1000-4-2 Contact Discharge

method, and ±15kV using the Human Body Model.

All devices are guaranteed at a data rate of 460kbps.

The transceivers have a proprietary low-dropout trans-

mitter output stage enabling RS-232 compatible opera-

tion from a +2.25V to +3.0V supply with a dual charge

pump. The charge pump requires only four 0.1µF

capacitors. The MAX3318E/MAX3319E feature a logic-

level output (READY) that asserts when the charge

pump is regulating and the device is ready to begin

transmitting.

The MAX3318E/MAX3319E achieve a 1µA supply current

using Maxim’s revolutionary AutoShutdown Plus feature.

These devices automatically enter a low-power shut-

down mode when the RS-232 cable is disconnected or

the transmitters of the connected peripherals are inactive

for more than 30 seconds. They turn on again when

they sense a valid transition at any transmitter or receiver

input. AutoShutdown Plus saves power without

changes to the existing BIOS or operating system. The

MAX3317E also features a 1µA shutdown mode that

can be entered by driving SHDN low. The MAX3317E’s

receivers remain active while in shutdown mode, allowing

external devices such as modems to be monitored

using only 1µA supply current.

These devices are available in space-saving packages:

MAX3316E (16-pin SSOP and 20-pin TSSOP), MAX3317E/

MAX3318E (20-pin SSOP and 20-pin TSSOP), and

MAX3319E (16-pin SSOP).

________________________Applications

Palmtop Computers

Hand-Held Instruments

Pagers

Cellular Phones

GPS

Handy Terminals

Hand-Held Electronic Books

____________________________Features

♦ 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

♦ 300µA Operating Supply Current

♦ 1µA Low-Power Shutdown with Receivers Active

♦ Guaranteed 460kbps Data Rate

♦ Guaranteed 4V/µs Slew Rate

♦ RS-232 Compatible Down to 2.25V

MAX3316E–MAX3319E

±15kV ESD-Protected, 2.5V, 1µA, 460kbps,

RS-232 Compatible Transceivers

________________________________________________________________ Maxim Integrated Products 1

FORCEOFF

GND

T1OUTC1-

V+

C1+

READY

R1IN

R1OUT

FORCEON

T1INT2OUT

V-

C2-

C2+

T2IN

INVALIDR2OUT

R2IN

MAX3318E

SSOP/TSSOP

Pin Configurations

19-1616; Rev 1; 6/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Ordering Information

Selector Guide and Typical Application Circuits appear at

end of data sheet.

AutoShutdown Plus is a trademark of Maxim Integrated Products.

PART

MAX3316ECUP

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 TSSOP

MAX3316ECAE 0°C to +70°C 16 SSOP

MAX3316EEUP -40°C to +85°C 20 TSSOP

MAX3316EEAE -40°C to +85°C 16 SSOP

MAX3317ECUP

0°C to +70°C 20 TSSOP

MAX3317ECAP 0°C to +70°C 20 SSOP

MAX3317EEUP -40°C to +85°C 20 TSSOP

MAX3317EEAP -40°C to +85°C 20 SSOP

MAX3318ECUP

0°C to +70°C 20 TSSOP

MAX3318ECAP 0°C to +70°C 20 SSOP

MAX3318EEUP -40°C to +85°C 20 TSSOP

MAX3318EEAP -40°C to +85°C 20 SSOP

MAX3319ECAE

0°C to +70°C 16 SSOP

MAX3319EEAE -40°C to +85°C 16 SSOP

Pin Configurations continued at end of data sheet.

Summary of content (16 pages)

PAGE 1
9-1616; Rev 1; 6/00 ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers ____________________________Features The MAX3316E–MAX3319E are 2.5V powered RS-232 compatible transceivers. These devices feature shutdown (MAX3317E), AutoShutdown Plus™ (MAX3318E/ MAX3319E), and enhanced electrostatic discharge (ESD) protection integrated into the chip.
PAGE 2
MAX3316E–MAX3319E ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V V+ to GND (Note 1) ..................................................-0.3V to +7V V- to GND (Note 1) ...................................................-7V to +0.3V V+ + |V-| (Note 1) .................................................................
PAGE 3
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers (V CC = +2.25V to +3.0V, C1–C4 = 0.1µF, TA = T MIN to T MAX, unless otherwise noted. Typical values are at V CC = +2.5V, TA = +25°C.) PARAMETER SYMBOL Output Resistance CONDITIONS VCC = 0, transmitter output = ±2V MIN TYP 300 10M ±25 Output Short-Circuit Current VCC = 0 or 2.25V to 3.
PAGE 4
TIMING CHARACTERISTICS (continued) (V CC = +2.25V to +3.0V, C1–C4 = 0.1µF, T A = T MIN to T MAX, unless otherwise noted. Typical values are at V CC = +2.5V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN VCC = 2.5V, TA = +25°C, RL = 3kΩ to 7kΩ, measured from +3V to -3V or -3V to +3V, CL = 150pF to 2500pF Transition-Region Slew Rate TYP 4 MAX UNITS 30 V/µs Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
PAGE 5
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers 15 10 20kbps 20kbps 6 T1 TRANSMITTING AT SPECIFIED DATA RATE T2 TRANSMITTING AT 20kbps CL = 1000pF 3 5 0 0 0 1000 2000 LOAD CAPACITANCE (pF) T_OUT+ 3 T1 TRANSMITTING AT 460kbps T2 TRANSMITTING AT 20kbps 1 0 -1 2.65 2.85 MAX3316E TOC07 2 T1 TRANSMITTING AT 460kbps T2 TRANSMITTING AT 20kbps CL = 1000pF 0 -2 T_OUT- -4 3.05 3.25 3.45 3.65 2.25 2.45 2.65 2.85 3.05 3.25 3.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, TA = +25°C, unless otherwise noted.
PAGE 7
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers PIN MAX3316E SSOP TSSOP NAME FUNCTION MAX3317E MAX3318E MAX3319E — 20 — — SHDN Shutdown Control, Active Low — — 1 1 READY Ready to Transmit Output, Active High. READY is enabled high when V- goes below -3.5V and the device is ready to transmit. — — 11 10 INVALID Valid Signal Detector Output, Active Low. A logic high indicates that a valid RS-232 level is present on a receiver input.
PAGE 8
MAX3316E–MAX3319E ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers Table 1.
PAGE 9
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers MAX3316E–MAX3319E +2.5V CBYPASS 0.1µF VCC C1+ C1 0.1µF C3 0.1µF C1C2+ C2 0.1µF V+ C2- MAX3316E MAX3317E MAX3318E MAX3319E V- +5V C4 0.1µF T_ OUT T_ IN RX 1000pF R_ IN R_ OUT TX RS-232 COMPLIANT TRANSCEIVER GND Figure 1a.
PAGE 10
By connecting FORCEON to INVALID, the MAX3318E/ MAX3319E shut down when no valid receiver level is detected and wake up when a valid receiver level is detected. A system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3318E/MAX3319E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232 ports on both systems remain enabled.
PAGE 11
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers MAX3316E–MAX3319E RECEIVER INPUTS INVALID } REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS INVALID OUTPUT VCC tINVL tINVH 0 tAUTOSHDN tAUTOSHDN tWU tWU *VCC OUTPUT 0 V+ VCC 0 V- MAX3318E/MAX3319E Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram POWERMANAGEMENT UNIT RC 1M MASTER SHDN LINE 0.1µF 1M CHARGE-CURRENT LIMIT RESISTOR FORCEOFF FORCEON MAX3318E MAX3319E Figure 5.
PAGE 12
IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to ICs. The MAX3316E–MAX3319E help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2 without the need for additional ESDprotection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2 because series resistance is lower in the IEC 1000-4-2 model.
PAGE 13
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers VCC CBYPASS VCC C1+ C1 C1C2+ C2 Transmitter Outputs when Exiting Shutdown Figure 2 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 compatible levels (one transmitter input is high, the other is low). Each transmitter is loaded with 3kΩ in parallel with 2500pF.
PAGE 14
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers MAX3316E–MAX3319E Pin Configurations (continued) TOP VIEW C1+ 1 16 VCC V+ 2 15 GND C1- 3 C2+ 4 14 T1OUT MAX3316E C2- 5 12 R1OUT V- 6 11 T1IN 10 T2IN T2OUT 7 9 R2IN 8 SSOP 14 13 R1IN R2OUT N.C. 1 20 N.C.
PAGE 15
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers PART NO. OF DRIVERS/ RECEIVERS GUARANTEED DATA RATE (kbps) READY OUTPUT SHUTDOWN MAX3316E 2/2 460 — MAX3317E 2/2 460 — ✓ MAX3318E 2/2 460 — ✓ MAX3319E 1/1 460 ✓ AutoShutdown Plus — — — ✓ — ✓ Typical Application Circuits +2.5V +2.5V 19 0.1µF C1 0.1µF 2 C1+ 4 5 C2 0.1µF 6 V+ 3 C3* 0.1µF C1- MAX3317E C2+ V- 0.1µF 0.
PAGE 16
MAX3316E–MAX3319E ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers Typical Application Circuits (continued) +2.5V CBYPASS C1 0.1µF +2.5V 2 C1+ 4 C15 C2 0.1µF CMOS INPUTS 19 0.1µF 6 3 V+ MAX3318E C2+ V- C3 0.1µF 2 C1+ C1 0.1µF 4 7 C4 0.1µF C2- 13 T1IN T1OUT 17 12 T2IN T2OUT 8 RS-232 COMPATIBLE OUTPUTS 15 0.1µF CBYPASS VCC 5 C2 0.1µF 6 CMOS INPUT CMOS OUTPUT C1- VCC 3 V+ MAX3319E C2+ V- C3 0.