ST ST3232EB, ST3232EC User Manual

ST3232EB

ST3232EC

± 15 kV ESD protection 3 to 5.5 V low power, up to 250 kbps, RS-232 drivers and receivers

Features

■ESD protection for RS-232 I/O pins

■±15 kV human body model

■±8 kV IEC 1000-4-2 contact discharge

■300 µA supply current

■250 kbps minimum guaranteed data rate

■6 V/µs minimum guaranteed slew rate

■Meet EIA/TIA-232 specifications down to 3 V

■Available in SO-16, SO-16 large and TSSOP16

Applications

■Notebook, subnotebook and palmtop computers

■Battery powered equipment

■Hand-held equipment

■Peripherals and printers

SO-16

SO-16 Large

TSSOP16

small 0.1 µF standard external capacitors for operations from 3 V supply.

The ST3232E has two receivers and two drivers.

The device is guaranteed to run at data rates of 250 kbps while maintaining RS-232 output levels.

Description

The ST3232E is a 3 V powered EIA/TIA-232 and V.28/V.24 communication interfaces with low power requirements, high data-rate capabilities and enhanced electrostatic discharge (ESD) protection to ± 8 kV using IEC1000-4-2 contact discharge and ± 15 kV using the human body model. ST3232E has a proprietary low dropout transmitter output stage providing true RS-232 performance from 3 to 5 V supplies with a dual charge pump. The charge pump requires only four

Table 1.	Device summary
Order codes		Temperature range	Packages	Packaging
ST3232ECDR		0 to 70 °C	SO-16 (tape and reel)	2500 parts per reel
ST3232EBDR		-40 to 85 °C	SO-16 (tape and reel)	2500 parts per reel
ST3232ECTR		0 to 70 °C	TSSOP16 (tape and reel)	2500 parts per reel
ST3232EBTR		-40 to 85 °C	TSSOP16 (tape and reel)	2500 parts per reel
January 2010			Doc ID 8784 Rev 6	1/17

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Contents	ST3232EB, ST3232EC

Contents

1	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
5	Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
6	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16

2/17	Doc ID 8784 Rev 6

ST3232EB, ST3232EC	Pin configuration

1 Pin configuration

Figure 1. Pin connection

Table 2.	Pin description
Pin n°		Symbol	Name and function
	1	C1+	Positive terminal for the first charge pump capacitor
	2	V+	Doubled voltage terminal
	3	C1-	Negative Terminal for the first charge pump capacitor
	4	C2+	Positive terminal for the second charge pump capacitor
	5	C2-	Negative terminal for the second charge pump capacitor
	6	V-	Inverted voltage terminal
	7	T2OUT	Second transmitter output voltage
	8	R2IN	Second receiver input voltage
	9	R2OUT	Second receiver output voltage
	10	T2IN	Second transmitter input voltage
	11	T1IN	First transmitter input voltage
	12	R1OUT	First receiver output voltage
	13	R1IN	First receiver input voltage
	14	T1OUT	First transmitter output voltage
	15	GND	Ground
	16	VCC	Supply voltage

Doc ID 8784 Rev 6

3/17

Absolute maximum ratings			ST3232EB, ST3232EC
2	Absolute maximum ratings
Table 3.	Absolute maximum ratings
Symbol	Parameter		Value	Unit
VCC	Supply voltage		-0.3 to 6	V
V+	Doubled voltage terminal		(VCC - 0.3) to 7	V
V-	Inverted voltage terminal		0.3 to -7	V
V+ +|V-|			13	V
TIN	Transmitter input voltage range		-0.3 to 6	V
RIN	Receiver input voltage range		± 25	V
TOUT	Transmitter output voltage range		± 13.2	V
ROUT	Receiver output voltage range		-0.3 to (VCC + 0.3)	V
tSHORT	Transmitter output short to gnd time		Continuous
Note:	Absolute maximum ratings are those values beyond which damage to the device may occur.
	Functional operation under these condition is not implied.

Externally applied V+ and V- can have a maximum magnitude of +7 V, but their absolute addition can not exceed 13 V.

Running on internal charge pump, intrinsic self limitation allows exceeding those values without any damage.

Startup voltage sequence (VCC, then V+, then V-) is critical, therefore it is not recommended to use this device using externally applied voltage to V+ and V-.

Figure 2.	ESD performance: transmitter outputs, receiver inputs
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
ESD	ESD protection voltage	Human body model	±15			kV
ESD	ESD protection voltage	IEC-1000-4-2	±8			kV

4/17	Doc ID 8784 Rev 6

ST3232EB, ST3232EC	Electrical characteristics

3 Electrical characteristics

C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C.

Table 4.

Electrical characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

ISUPPLY

VCC Power supply current

No Load, VCC = 3V or 5V, TA = 25°C

0.3

1

mA

C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical

values are referred to TA = 25 °C.

Table 5.

Logic input

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTIL

Input logic threshold low

T-IN

0.8

V

VHYS

Transmitter input hysteresis

0.25

V

VTIH

Input logic threshold high

VCC = 3.3V

2

V

VCC = 5V

2.4

IIL

Input leakage current

T-IN

± 0.01

± 1

µA

C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless

otherwise specified. Typical values are referred to TA = 25 °C.

Table 6.

Transmitter

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTOUT

Output voltage swing

All transmitter outputs are loaded with

± 5

± 5.4

V

3kΩ to GND

RTOUT

Transmitter output

VCC = 0V, VOUT = ± 2V

300

10M

Ω

resistance

ISC

Output short circuit current

± 60

mA

VCC = 0V or 3.3V to 5.5V

ITOL

Output leakage current

VOUT = ± 12V

± 25

µA

Transmitters disable

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5/17

Electrical characteristics	ST3232EB, ST3232EC

C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C.

Table 7.

Receiver

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VRIN

Receiver input voltage operating

-25

25

V

range

VRIL

RS-232 Input threshold low

TA = 25°C, VCC = 3.3V

0.6

1.1

V

TA = 25°C, VCC = 5V

0.8

1.5

VRIH

RS-232 Input threshold high

TA = 25°C, VCC = 3.3V

1.4

2.4

V

TA = 25°C, VCC = 5V

1.8

2.4

VRIHYS

Input hysteresis

0.5

V

RRIN

Input resistance

TA = 25°C

3

5

7

kΩ

VROL

TTL/CMOS Output voltage low

IOUT = 1.6mA

0.4

V

VROH

TTL/CMOS Output voltage high

IOUT = -1mA

VCC-0.6

VCC-0.1

V

C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless

otherwise specified. Typical values are referred to TA = 25 °C

Table 8.

Timing characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

DR

Data transfer rate

RL = 3KΩ, CL2= 1000pF

250

kbps

one transmitter switching

tPHLR

Propagation delay input to

RXIN = RXOUT, CL = 150pF

0.15

µs

tPLHR

output

tOER

Receiver output enable time

Normal Operation

50

ns

tODR

Receiver output disable time

Normal Operation

50

ns

|tPHLT

Transmitter propagation

(1)

200

ns

- tTHL|

delay difference

|tPHLR

Receiver propagation delay

50

ns

- tTHR|

difference

TA = 25°C RL = 3kΩ to 7kΩ VCC = 3.3V

SRT

Transition slew rate

measured from +3V to -3V or -3V to +3V

CL = 150pF to 1000pF

6

30

V/µs

CL = 150pF to 2500pF

4

30

V/µs

1. Transmitter skew is measured at the transmitter zero cross points.

6/17	Doc ID 8784 Rev 6