Maxim MAX3220LCAP, MAX3220BEAP, MAX3220BCAP, MAX3220AEAP, MAX3220ACAP Datasheet

_______________General Description

The MAX3320 combines a microprocessor (µP) super­visory circuit with an RS-232 transceiver. The power-on
reset performs a single function: it asserts a reset signal
whenever the VCCsupply voltage declines below a pre­set threshold, staying asserted for at least 100ms after
VCCrises above the reset threshold. The MAX3320 has
an active-low RESET output, which is guaranteed to be in
the correct state for VCCdown to 1V. The reset compara­tor is designed to ignore fast transients on VCC. Reset
thresholds suitable for operation with a variety of supply
voltages are available.

The MAX3320 transceivers have a proprietary low­dropout transmitter output stage, enabling true RS-232
performance with a dual charge pump powered from a
+3V to +5.5V supply. The device requires only four
small 0.1µF external charge-pump capacitors, and is
guaranteed to run at data rates of up to 250kbps. It
comes in the space-saving 20-pin SSOP package.

________________________Applications

Palmtop Computers
Portable/Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers

____________________________Features

♦ Precise Monitoring of 5V and 3.3V Power-

Supply Voltages:
— 100ms (min) Power-On

RESET Pulse Width
— Power-Supply Transient Immunity
— Guaranteed RESET Valid to VCC= 1V

♦ 4µA Supply Current Achieved with

AutoShutdown Plus

♦ Receivers Always Active
♦ Power-On Reset Always Active
♦ 4µA Low-Power Shutdown
♦ 250kbps Guaranteed Data Rate

MAX3320A/B/L/T

3V to 5.5V, up to 250kbps True RS-232 T ransceiver

with 4µA AutoShutdown Plus and Power-On Reset

________________________________________________________________

Maxim Integrated Products

1

20
19
18
17
16
15
14
13

1
2
3
4
5
6
7
8

C1+
V

CC

C1­GNDV-

C2-

C2+

V+

TOP VIEW

T1OUT
T2OUT
R1IN
R2INR2OUT

R1OUT

T2IN

T1IN

12
11

9

10

FORCEON
FORCEOFFRESET

INVALID

MAXxxx

SSOP

MAX3320

__________________Pin Configuration

19-1253; Rev 0; 8/97

PART*

MAX3320_CAP
MAX3320_EAP -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 SSOP
20 SSOP

______________Ordering Information

*

This part offers a choice of reset threshold voltage. From the
table below, select the suffix corresponding to the desired
threshold and insert it into the blank to complete the part
number.

AutoShutdown Plus is a trademark of Maxim Integrated Products.

SUFFIX

A
B

RESET THRESHOLD

(V)

4.25

2.85
L 4.63
T 3.08

Typical Operating Circuit appears at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

MAX3320A/B/L/T

3V to 5.5V, up to 250kbps True RS-232 T ransceiver
with 4µA AutoShutdown Plus and Power-On Reset

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 3V to 5.5V, C1–C4 = 0.1µF (tested at 3.3V ±10%), C1 = 0.047µF, C2–C4 = 0.33µF (tested at 5V ±10%), TA= T

MIN

to T

MAX

,

unless otherwise noted. Typical values are at 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.

VCC.............................................................................-0.3V to 6V

V+ (Note 1) .................................................................-0.3V to 7V

V- (Note 1)...................................................................0.3V to -7V

V+ +

|V-|

(Note 1)...................................................................13V

Input Voltages

T_IN, FORCEOFF, FORCEON................................-0.3V to 6V

R_IN.................................................................................±25V

Output Voltages

T_OUT ..........................................................................±13.2V

R_OUT, INVALID, RESET.......................-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration

T_OUT....................................................................Continuous

Continuous Power Dissipation (TA= +70°C)

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

Operating Temperature Ranges

MAX3320_CAP...................................................0°C to +70°C

MAX3320_EAP................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +160°C

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

V-0.3 0.3Figure 3

Receiver Input Threshold to
INVALID Output Low

-2.7Figure 3, negative threshold

V

2.7Figure 3, positive threshold

Receiver Input Threshold to
INVALID Output High

kΩ

3 5 7TA= +25°CInput Resistance

V0.3Input Hysteresis

1.8 2.4VCC= 5V

V

1.5 2.4VCC= 3.3V

Input Threshold High

0.8 1.5VCC= 5V

V

0.6 1.2VCC= 3.3V

Input Threshold Low

V-25 25Input Voltage Range

µA4.0 10

FORCEOFF = GND, TA= +25°C

Shutdown Supply Current

mA0.45 1.0No load, VCC= 3.3V or 5V, TA= +25°CPower-Supply Current

V

VCC- V

CC -

0.6 0.1

I

OUT

= -1mAOutput Voltage High

V0.4I

OUT

= 1.6mAOutput Voltage Low

mV250

T_IN, FORCEON, FORCEOFF

Input Hysteresis

µA±0.01 ±1.0

T_IN, FORCEON, FORCEOFF

Input Leakage Current

µA4.0 10

All R_IN unconnected, FORCEON = GND,
FORCEOFF = V

CC

, all T_IN = VCCor GND, TA= +25°C

AutoShutdown Plus
Supply Current

V0.8

T_IN, FORCEON, FORCEOFF

Input Logic Threshold Low

V

2.0

Input Logic Threshold High

UNITSMIN TYP MAXCONDITIONSPARAMETER

T_IN, FORCEON,

FORCEOFF

2.4

V0.4I

OUT

= 1.6mA

INVALID Output Voltage Low

Note 1: V+ and V- can have a magnitude of +7V (max), but their absolute difference cannot exceed +13V.

VCC= 3.3V
VCC= 5V

DC CHARACTERISTICS

LOGIC INPUTS AND RECEIVER OUTPUTS

RECEIVER INPUTS

INVALID OUTPUT

MAX3320A/B/L/T

3V to 5.5V, up to 250kbps True RS-232 T ransceiver

with 4µA AutoShutdown Plus and Power-On Reset

_______________________________________________________________________________________ 3

sec15 30 60Figure 3

Receiver or Transmitter Edge
to Shutdown

µs25Figure 5

Receiver or Transmitter Edge
to Transmitters Enabled

90 µsFigure 3

Receiver Positive or Negative
Threshold to INVALID Low

µs0.1Figure 3

Receiver Positive or Negative
Threshold to INVALID High

UNITSMIN TYP MAXCONDITIONSPARAMETER

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3V to 5.5V, C1–C4 = 0.1µF (tested at 3.3V ±10%), C1 = 0.047µF, C2–C4 = 0.33µF (tested at 5V ±10%), TA= T

MIN

to T

MAX

,

unless otherwise noted. Typical values are at T

A

= +25°C.)

V±5.0 ±5.4

All transmitter outputs loaded with 3kΩ to ground

Output Voltage Swing

Ω

300 10MVCC= V+ = V- = GND, V

T_OUT

= ±2VOutput Resistance

mA±35 ±60T_OUT = GND, T_IN = VCCor GNDOutput Short-Circuit Current

µA±25V

T_OUT

= ±12V, VCC= 0 to 5.5V, transmitters disabledOutput Leakage Current

V

1.0 5.5MAX3320_C

RESET Operating Voltage
Range

1.2 5.5MAX3320_E

V

4.00 4.25 4.50MAX3320A

RESET Threshold

2.70 2.85 3.00MAX3320B

4.50 4.63 4.75MAX3320L

3.00 3.08 3.15MAX3320T

V

0.3I

SINK

= 1.2mA, VCC= reset threshold, MAX3320B/T

RESET Output Voltage

0.4I

SINK

= 3.2mA, VCC= reset threshold, MAX3320A/L

0.3I

SINK

= 50µA, VCC> 1V, MAX3320_C

0.4I

SINK

= 100µA, VCC> 1.2V, MAX3320_E

VVCC- 0.6I

OUT

= -1mA

INVALID Output Voltage High

AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF = VCC)

TRANSMITTER OUTPUTS

RESET OUTPUT

MAX3320A/B/L/T

3V to 5.5V, up to 250kbps True RS-232 T ransceiver
with 4µA AutoShutdown Plus and Power-On Reset

4 _______________________________________________________________________________________

-7.5

V

T_OUT-

V

T_OUT+

-2.5

-5.0

2.5

0

5.0

7.5

0 20001000 3000 4000 5000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3320 TOC01

LOAD CAPACITANCE (pF)

OUTPUT VOLTAGE (V)

ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3kΩ + C

L

0

2

8

6

4

10

12

0 20001000 3000 4000 5000

SLEW RATE

vs. LOAD CAPACITANCE

MAX3320 TOC02

LOAD CAPACITANCE (pF)

SLEW RATE (V/us)

ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3kΩ + C

L

NEGATIVE

SLEW

POSITIVE

SLEW

0

250kbps

120kbps

20kbps

10

5

30

20

25

15

40
35

45

0 20001000 3000 4000 5000

SUPPLY CURRENT

vs. LOAD CAPACITANCE WHEN

TRANSMITTING DATA

MAX3320 TOC03

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

ONE TRANSMITTER AT
FULL DATA RATE INDICATED

ONE TRANSMITTER AT
1/16 DATA RATE INDICATED

TIMING CHARACTERISTICS

(VCC= 3V to 5.5V, C1–C4 = 0.1µF, C1–C4 = 0.1µF (for 3.3V ±10%), C1 = 0.047µF, C2–C4 = 0.33µF (tested at 5V ±10%),
T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

kbps250

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

Maximum Data Rate

ns100

|

t

PHL

- t

PLH

|

Transmitter Skew

0.3

µs

0.3

R_IN to R_OUT, CL= 150pFReceiver Propagation Delay

UNITSMIN TYP MAXCONDITIONSPARAMETER

t

PLH

t

PHL

ns200

|

t

PHL

- t

PLH

|

Receiver Skew

CL= 150pF to
1000pf

V/µs

6 30

VCC= 3.3V, RL= 3kΩ to 7kΩ,
measured from +3V to -3V or -3V to
+3V, T

A

= +25°C

Transition-Region Slew Rate

ms100 280VCC= reset threshold

RESET Active Timeout Period

µs40100mV overdrive from reset threshold

VCCto RESET Delay

CL= 150pF to
2500pf

4 30

__________________________________________Typical Operating Characteristics

(VCC= 3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ. Typical values are at TA= +25°C, unless

otherwise noted.)