UPD4722GS Просмотр технического описания (PDF) - NEC => Renesas Technology

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производитель

UPD4722GS

RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V

NEC => Renesas Technology 

µPD4722

Truth Table

Driver

STBY

DIN

L

×

H

L

H

H

Receiver

DOUT

Z

H

L

Remarks

Standby mode (DC/DC converter is stopped)

Space level output

Mark level output

STBY

L

L

L

H

H

RIN

ROUT

EN

R3 to R4 R1 to R2 R3 to R4 R1 to R2

Remarks

L

×

×

H

H

Standby mode 1 (DC/DC converter is stopped)

H

L

×

Standby mode 2 (DC/DC converter is stopped, R3

H

H

and R4 are operated)

H

H

×

Standby mode 2 (DC/DC converter is stopped, R3

L

H

and R4 are operated)

×

L

H

Mark level input

×

H

L

Space level input

3 V ↔ 5 V switchingNote 5

VCHA

L

H

Operating mode

5 V mode (double step-up)

3 V mode (3 times step-up)

H: high-level, L: low-level, Z: high-impedance, ×: H or L

Note 5. When switching VCHA, standby mode must be selected (STBY = L).

3

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