MAX563CPN View Datasheet(PDF) - Maxim Integrated

Part Name

Description

View to exact match

MAX563CPN

+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown

Maxim Integrated 

+3.3V-Powered, EIA/TIA-562 Dual Transceiver

with Receivers Active in Shutdown

+3.6V

0.1µF

ISHDN

0.1µF

0.1µF

0.1µF

+3.6V

C1+

VCC

V+

C1-

MAX563

C2+ VCC

C2- 400k

V-

0.1µF

T1 & T2

TIN

TOUT

0V +3.6V

DRIVE

R1 & R2

ROUT

EN

SHDN

GND

3k

RIN

+3.6V

5k

Figure 1. Shutdown Current Test Circuit

The inputs of unused drivers may be left unconnected

because they have internal 400kΩ pull-ups to VCC.

Unused inputs may also be connected to GND or VCC,

but VCC provides lower power consumption because of

the internal pull-ups.

EIA/TIA-562 and EIA/TIA-232 Receivers

The MAX563’s receivers convert ±3.7V to ±13.2V

EIA/TIA-562 signal levels into +3V logic levels; they are

rated to receive signals up to ±25V to accommodate

EIA/TIA-232 signals as well. Both receivers invert. Their

inputs are each equipped with an internal 5kΩ (nomi-

nal) terminating resistor connected to ground, and the

input logic thresholds are 0.4V and 2.4V. The positive

logic-low threshold (VIL) ensures the receiver outputs

remain high whenever their inputs are left open.

The receivers are active when EN is low, and have

high-impedance outputs when EN is high.

When SHDN is high, the receivers have hysteresis.

This produces clean output transitions, even with slow-

moving input signals that exhibit moderate amounts of

noise and ringing. When shut down, the receivers have

no hysteresis, and the propagation delay increases.

Shutdown and Enable Control

The SHDN and EN controls are independent. Both

receivers are always active when EN is low. With EN

low and SHDN high, the receivers operate at full speed

+3V

INPUT

OV

OUTPUT

tPLHT

V+

OV

V-

tPHLT

Figure 2. Transmitter Propagation Delay Timing

INPUT

+3V

50%

50%

0V

OUTPUT

50%

tPHLR

tPHLS

VCC

50%

GND

tPLHR

tPLHS

Figure 3. Receiver Propagation Delay Timing

and have hysteresis. When active in shutdown mode

(EN = SHDN = low), the receivers operate at reduced

power and speed, and without hysteresis.

The charge pumps and transmitters operate only when

SHDN is high; they are unaffected by EN. When shut

down (SHDN = low) or unpowered (VCC = 0V), the

transmitter outputs are high impedance if they are

backdriven with voltages not exceeding ±15V. The pull-

up resistors at the driver inputs are disconnected in

shutdown mode to save power. During shutdown, V+ is

pulled down to VCC, and V- rises to GND.

_______________________________________________________________________________________ 5

Share Link: