ST3237EB 查看數據表（PDF） - STMicroelectronics

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ST3237EB

± 15 kV ESD protected, 1 µA, 3 to 5.5 V, 250 kbps RS-232 transceiver with stand-by

STMicroelectronics 

ST3237EB

Electrical characteristics

Table 8.

Symbol

Receiver (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)

Parameter

Test conditions

Min.

Typ. Max. Unit

IOL

VOL

VOH

VRIN

Output leakage current

Output voltage low

Output voltage high

Receiver input voltage

operating range

Receiver disabled, EN = VCC

IOUT = 1mA

IOUT = -1mA

± 0.05 ± 10 µA

0.4

V

VCC-0.6 VCC-0.1

V

-25

25

V

VRIL

RS-232 input threshold

low

VRIH

RS-232 input threshold

high

VRIHYS

RRIN

Input hysteresis

Input resistance

TA = 25°C, VCC = 3.3V

TA = 25°C, VCC = 5V

TA = 25°C, VCC = 3.3V

TA = 25°C, VCC = 5V

TA = 25°C

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

Table 9.

Symbol

Timing characteristics (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)

Parameter

Test conditions

Min. Typ. Max. Unit

RL = 3KΩ, CL= 1000pF

one transmitter switching, VHSCI=GND

DR

tPHLR

tPLHR

tPHLR

tPLHR

Maximum data rate

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, CL = 1000pF,

VHSCI=VCC

VHSCI=GND

tT_SKEW Transmitter skew

|tPHL - tTLH|, VHSCI=GND

|tPHL - tTLH|, VHSCI=VCC

tR_SKEW Receiver skew

|tPHL - tTLH|

tOER Receiver output enable time Normal operation

tODR Receiver output disable time Normal operation

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

CL = 150pF to 1000pF, VHSCI=VCC

CL = 150pF to 2500pF, VHSCI=GND

250

1000

Kbps

Kbps

1000

0.15

400

1000

300

50

100

50

120

Kbps

µs

ns

ns

ns

ns

ns

ns

ns

6

30 V/µs

24

150 V/µs

4

30 V/µs

Note:

Transmitter skew is measured at the transmitter zero cross points

7/18

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