ST3237E View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST3237E

±15KV ESD-PROTECTED, 1µA, 3 TO 5.5V, 250KBPS, RS-232 TRANSCEIVER WITH STAND-BY

STMicroelectronics 

ST3237E

RECEIVER ELECTRICAL CHARACTERISTICS

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

Typical values are referred to TA = 25°C)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

IOL Output Leakage Current

VOL Output Voltage Low

VOH Output Voltage High

VRIN

VRIL

Receiver Input Voltage

Operating Range

RS-232 Input Threshold

Low

VRIH RS-232 Input Threshold

High

VRIHYS Input Hysteresis

RRIN Input Resistance

Receiver Disabled

IOUT = 1mA

IOUT = -1mA

EN=VCC

TA = 25°C

TA = 25°C

TA = 25°C

TA = 25°C

VCC = 3.3V

VCC = 5V

VCC = 3.3V

VCC = 5V

TA = 25°C

± 0.05 ± 10 µA

0.4

V

VCC-0. VCC-0.1

V

6

-25

25

V

0.6

1.1

V

0.8

1.5

1.5

2.4

V

1.2

2.4

0.3

V

3

5

7

KΩ

TIMING CHARACTERISTICS

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

Typical values are referred to TA = 25°C)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

DR Maximum Data Rate

RL = 3KΩ CL= 1000pF

250

one transmitter switching VHSCI=GND

Kbps

tPHLR

tPLHR

tPHLR

tPLHR

Propagation Delay Input to

Output

Propagation Delay Input to

Output

RL = 3KΩ CL= 250pF

one transmitter switching VHSCI=VCC

VCC= 3 to 4.5V

RL = 3KΩ CL= 1000pF

one transmitter switching VHSCI=VCC

VCC= 4.5 to 5.5V

RIN to ROUT

CL = 150pF

RL = 3kΩ

VHSCI=VCC

VHSCI=GND

CL = 1000pF

1000

1000

0.15

400

1000

Kbps

Kbps

µs

ns

ns

tT_SKEW Transmitter Skew

|tPHL - tTLH|

VHSCI=GND

300

ns

|tPHL - tTLH|

VHSCI=VCC

50

ns

tR_SKEW Receiver Skew

tOER Receiver Output Enable

Time

|tPHL - tTLH|

Normal Operation

100

ns

50

ns

tODR Receiver Output Disable

Time

Normal Operation

120

ns

SRT Transition Slew Rate

TA = 25°C RL = 3 to 7KΩ VCC = 3.3V

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

CL = 150pF to 1000pF VHSCI=GND

6

CL = 150pF to 1000pF VHSCI=VCC

CL = 150pF to 2500pF VHSCI=GND

24

4

30 V/µs

150 V/µs

30 V/µs

Transmitter Skew is measured at the transmitter zero cross points

5/13

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