MAXIM MAX3316, MAX3319 User Manual

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General Description

The MAX3316–MAX3319 transceivers have a proprietary
low-dropout transmitter output stage enabling RS-232­compatible performance from +2.25V to +3.0V with a
dual-charge pump. These devices require only four

0.1µF capacitors, and are guaranteed to operate at data
rates up to 460kbps.

The MAX3318/MAX3319 achieve a 1µA supply current
using Maxim’s revolutionary AutoShutdown Plus™ fea­ture. These devices automatically enter a low-power
shutdown 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 MAX3318
is a 2-Tx/2-Rx device while the MAX3319 is a 1-Tx/1-Rx
device. These devices also feature a logic-level output
(READY) that asserts when the charge pump is regulat­ing and the device is ready to begin transmitting.

The MAX3316/MAX3317 are 2-Tx/2-Rx transceivers. The
MAX3317 features a 1µA shutdown mode that can be
entered by driving SHDN low. The MAX3317’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:
MAX3316 (16-pin SSOP and 20-pin TSSOP), MAX3317/
MAX3318 (20-pin SSOP and 20-pin TSSOP), and
MAX3319 (16-pin SSOP).

________________________Applications

Palmtop Computers
Hand-Held Instruments
Pagers
Cellular Phones
GPS
Handy Terminals
Hand-Held Electronic Books

Features

♦ AutoShutdown Plus (MAX3318/MAX3319)

♦ 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

MAX3316–MAX3319

2.5V, 1µA, 460kbps,

RS-232-Compatible Transceivers

________________________________________________________________ Maxim Integrated Products 1

Typical Application Circuits

19-1751; Rev 0; 6/00

Ordering Information

AutoShutdown Plus is a trademark of Maxim Integrated Products.

Pin Configurations appear at end of data sheet.

Typical Application Circuits continued at end of data sheet.

PIN-PACKAGETEMP. RANGEPART

MAX3316CUP

0°C to +70°C 20 TSSOP

16 SSOP0°C to +70°CMAX3316CAE

MAX3316EUP -40°C to +85°C 20 TSSOP

16 SSOP-40°C to +85°CMAX3316EAE

PART

NO. OF DRIVERS/

RECEIVERS

GUARANTEED

DATA RATE (kbps)

READY OUTPUT SHUTDOWN

——460

460 —

✓

—

—

✓

✓

460

460

2/2

2/2

2/2

1/1

MAX3316

MAX3317

MAX3318

MAX3319

AutoShutdown

Plus

—

—

✓

✓

Selector Guide

Ordering Information continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

+2.5V

BYPASS

0.1µF

0.1µF

OUTPUT

C1

C2

CMOS
INPUT

CMOS

0.1µF

C

15

V

2

C1+

4

C1-

5

C2+

6

C2-

11

T1IN

R1OUT9

READY

1

FORCEON

12

CC

MAX3319

AutoShutdown

Plus

GND

14

T1OUT 13

R1IN 8

5k

INVALID 10

FORCEOFF

3

V+

V-

7

16

C3

0.1µF

C4

0.1µF

RS-232­COMPATIBLE
OUTPUT

RS-232­COMPATIBLE
INPUT

TO POWER­MANAGEMENT
UNIT

V

CC

2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +2.5V,

T

A

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VCCto 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) .................................................................+13V

Input Voltages

T_IN, EN, SHDN, FORCEON,

FORCEOFF to GND ..................................................-0.3V to +6V

R_IN to GND .....................................................................±25V

Output Voltages

T_OUT to GND...............................................................±13.2V

R_OUT, INVALID, READY to GND ..........-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration, T_OUT to GND.......................Continuous

Continuous Power Dissipation (T

A

= +70°C)

16-Pin SSOP (derate 7.14mW/°C above +70°C).........571mW

20-Pin SSOP (derate 8.00mW/°C above +70°C).........640mW

20-Pin TSSOP (derate 7.00mW/°C above +70°C).......559mW

Operating Temperature Ranges

MAX331_C_ _.....................................................0°C to +70°C

MAX331_E_ _..................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Die Temperature ..............................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

MAX3316–MAX3319

TRANSMITTER OUTPUTS

PARAMETER

RECEIVER INPUTS

RECEIVER OUTPUTS

LOGIC INPUTS

SYMBOL MIN TYP MAX UNITS

Input Logic Threshold High

0.7 ✕ V

CC

V

Input Logic Threshold Low

0.3 ✕ V

CC

V

Supply Current

0.3 1

mA

Transmitter Input Hysteresis

0.3

V

Input Leakage Current

±0.01 ±1

µA

Output Leakage Current

±0.05 ±10

µA

AutoShutdown Plus Supply
Current

110

µA

Shutdown Supply Current

110

µA

Output Voltage Low

0.1 ✕ V

CC

V

Output Voltage High

0.9 ✕ V

CC

V

Input Voltage Range

-25 +25

V

Input Threshold Low

0.3 ✕ V

CC

V

Input Threshold High

0.7 ✕ V

CC

V

Input Hysteresis 0.3 V

Input Resistance

357

kΩ

Output Voltage Swing

±3.7 ±4

V

CONDITIONS

I

OUT

= 0.5mA

T_IN, EN, SHDN, FORCEON, FORCEOFF

I

OUT

= -0.5mA

T_IN, EN, SHDN, FORCEON, FORCEOFF

SHDN = VCC, no load (MAX3317),
FORCEON = FORCEOFF = V

CC

, no load

(MAX3318/MAX3319)

T_IN, EN, SHDN, FORCEON, FORCEOFF

EN = VCC(MAX3317), receivers disabled

TA= +25°C

TA= +25°C

TA= +25°C

FORCEON = GND, FORCEOFF = VCC,
all R_IN idle, all T_IN idle
(MAX3318/MAX3319)

All transmitter outputs loaded with 3kΩ to
ground

SHDN = GND (MAX3317), FORCEOFF = GND
(MAX3318/MAX3319)

DC CHARACTERISTICS (VCC= +2.5V, TA= +25°C)

LOGIC INPUTS

RECEIVER OUTPUTS

RECEIVER INPUTS

TRANSMITTER OUTPUTS

MAX3316–MAX3319

2.5V, 1µA, 460kbps,

RS-232-Compatible Transceivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +2.5V,

T

A

= +25°C.)

TIMING CHARACTERISTICS

(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +2.5V,

T

A

= +25°C.)

R_IN to R_OUT, CL= 150pF

RL= 3kΩ, CL= 1000pF, one transmitter
switching

Normal operation (MAX3317)

Normal operation (MAX3317)

(Note 3)

CONDITIONS

0.175

t

PLH

µs

0.175

t

PHL

kbps

460

Maximum Data Rate

Receiver Propagation Delay

ns

250

Receiver Output Enable Time

ns

250

Receiver Output Disable Time

ns

100

|t

PHL

- t

PLH

|

Transmitter Skew

ns

50

|t

PHL

- t

PLH

|

Receiver Skew

UNITSMIN TYP MAXSYMBOLPARAMETER

Receiver Positive or Negative
Threshold to INVALID Low

t

INVL

30

µs

Receiver or Transmitter Edge to
Transmitters Enabled

t

WU

100

µs

Receiver or Transmitter Edge to
Transmitters Shutdown

t

AUTO­SHDN

15 30 60

s

Negative threshold

Figure 4b

Figure 4b (Note 2)

VCC= 2.5V, Figure 4b (Note 2)

Positive threshold

Receiver Input Threshold to
INVALID Output High

2.7
V

-2.7

Receiver Input Threshold to
INVALID Output Low

-0.3 0.3

V

INVALID, READY Output
Voltage Low

0.1 ✕ V

CC

V

INVALID, READY Output
Voltage High

0.9 ✕ V

CC

V

Receiver Positive or Negative
Threshold to INVALID High

t

INVH

1

µs

Figure 4a

Figure 4a

I

OUT

= 0.5mA

I

OUT

= -0.5mA

Figure 4b

PARAMETER SYMBOL MIN TYP MAX UNITS

Output Resistance

300 10M

Ω

Output Short-Circuit Current

±25 ±60

mA

Output Leakage Current

±25

µA

CONDITIONS

VCC= 0, transmitter output = ±2V

VCC= 0 or 2.25V to 3.0V, V

OUT

= ±12V,

transmitters disabled

AutoShutdown Plus (FORCEON = GND, FORCEOFF = VCC) (MAX3318/MAX3319)

MAX3316–MAX3319

2.5V, 1µA, 460kbps,
RS-232-Compatible Transceivers

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, TA= +25°C, unless otherwise noted.)

0

2

6

4

8

10

2.25 2.652.45 2.85 3.05 3.25 3.45 3.65

MAX3316/MAX3317

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX3316 TOC01

VCC (V)

SUPPLY CURRENT (mA)

T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
C

L

= 1000pF

460kbps

230kbps

20kbps

-6

-2

-4

2

0

4

6

2.25 2.85 3.052.45 2.65 3.25 3.45 3.65

MAX3316/MAX3317

TRANSMITTER OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

MAX3316 TOC02

VCC (V)

TRANSMITTER OUTPUT VOLTAGE (V)

T_OUT+

T_OUT-

T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
C

L

= 1000pF

-5

-2

-3

-4

-1

0

1

2

3

4

5

0 1000 2000 3000

MAX3316/MAX3317

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3316 TOC03

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

T_OUT+

T_OUT-

T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps

0

2

6

4

8

10

MAX3316/MAX3317

SLEW RATE vs. LOAD CAPACITANCE

MAX3316 TOC04

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

0 20001000 3000

-SLEW

+SLEW

FOR DATA RATES UP TO 460kbps

TIMING CHARACTERISTICS (continued)

(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +2.5V,

T

A

= +25°C.)

Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3: Transmitter skew is measured at the transmitter zero crosspoints.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V/µs

430

VCC= 2.5V, TA= +25°C, RL= 3kΩ to 7kΩ,
one transmitter switching, measured from +3V
to -3V or -3V to +3V, C

L

= 150pF to 2500pF

Transition-Region Slew Rate

MAX3316–MAX3319

2.5V, 1µA, 460kbps,

RS-232-Compatible Transceivers

_______________________________________________________________________________________ 5

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.)

0

10

5

20

15

30

25

35

MAX3316/MAX3317

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3316 TOC05

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

0 1000 2000 3000

T1 TRANSMITTING AT SPECIFIED DATA RATE
T2 TRANSMITTING AT 20kbps

460kbps

230kbps

20kbps

MAX3318/MAX3319

TRANSMITTER OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

6

4

2

T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps

0

= 1000pF

C

L

-2

-4

TRANSMITTER OUTPUT VOLTAGE (V)

-6

2.25 2.85 3.052.45 2.65 3.25 3.45 3.65

T_OUT+

T_OUT-

VCC (V)

MAX3318/MAX3319

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

35

T1 TRANSMITTING AT SPECIFIED
DATA RATE

30

T2 TRANSMITTING AT 20kbps

25

20

15

SUPPLY CURRENT (mA)

10

5

0

0 1000 2000 3000

460kbps

230kbps

20kbps

LOAD CAPACITANCE (pF)

MAX3318/MAX3319

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

5

4

3

2

T1 TRANSMITTING AT 460kbps

1

T2 TRANSMITTING AT 20kbps

0

-1

-2

-3

TRANSMITTER OUTPUT VOLTAGE (V)

-4

-5
0 1000 2000 3000

T_OUT+

T_OUT-

LOAD CAPACITANCE (pF)

15

12

9

6

SUPPLY CURRENT (mA)

3

0

10

MAX3316 TOC08

8

6

4

SLEW RATE (V/µs)

2

0

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX3318/MAX3319

460kbps

230kbps

20kbps

T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps

= 1000pF

C

L

2.25 2.652.45 2.85 3.05 3.25 3.45 3.65
VCC (V)

MAX3318/MAX3319

SLEW RATE vs. LOAD CAPACITANCE

-SLEW

+SLEW

FOR DATA RATES UP TO 460kbps

0 20001000 3000

LOAD CAPACITANCE (pF)

MAX3316 TOC06

MAX3316 TOC09

MAX3316 TOC07

MAX3316 TOC10