MYSON

TECHNOLOGY

MTD392

FAMILY

MTD392 Revision 2.01 02/25/1997

6/10

receiving operation. During transmission, the detection

threshold is increased to -0.42V plus its own transmission

level on the CDS pin. When TST- is connected to VEE and

MOD- is connected to GND, MTDX94 uses the transmit-

hybrid mode for collision detection. This mode is identical to

hybrid-mode, except that during idle or receiving operation,

the detection threshold is set at -1.53V. For proper operation

of hybrid and transmission-hybrid mode, a 400

W resistor

should be connected between the CDS pin and GND. This pin

has a 50 k

W internal pull-up resistor.

3.0 ABSOLUTE MAXIMUM RATINGS

DC Supply Voltage (VEE)

-12V

Input Voltage

GND+0.3 to VEE-0.3V

Storage Temperature

Ambient Operating Temperature

ESD Protection except RXI

2000V

4.0 OPERATING CONDITIONS

DC Supply Voltage (VEE)

8.55-9.45V

Operating Temperature

Parameter

Symbol

Min

Typ

Max

Unit

Recommended Supply Voltage

VEE

-8.55

-9.0

-9.45

V

Non-transmitting Supply Current (VEE to GND)

IEE

-

-25

-35

mA

Transmission

-

-70

-80

mA

Receiving Input Bias Current (RXI)

Irxi

-2

-

+25

mA

Transmitting Output DC Current (TXO)

Itdc

37

41

45

mA

Transmitting Output AC Current (TXO)

Itac

±28

-

Itdc

mA

Collision Threshold (Receiving Mode)

Vcd

-1.45

-1.53

-1.62

V

Collision Threshold (Hybrid Mode)

(MTDX94 only)

Vhcd

-0.38

-0.45

-0.52

V

Carrier Sense Threshold (RXI)

Vcs

-0.38

-0.45

-0.52

V

Differential Output Voltage (RX

±,CD±)

Vod

±500

-

±1500

mV

DC Common Mode Output Voltage (RX

±,CD±) (Note2)

Voc

-1.0

-2.0

-3.0

V

Idle State Differential Offset Voltage(RX

±,CD±)

Vob

-

0

±40

mV

Transmission Squelch Threshold(TX

±)

(Note 3)

Vts

-175

-225

-300

mV

Input Capacitance (RXI)

Cx

-

1.5

-

pF

Shunt Resistance-Non-transmitting

Rrxi

100

-

-

k

W

Shunt Resistance-Transmitting

Rtxo

10

-

-

k

W

Notes:1. Testing is done under the testing load defined in Figure 6.

2. During idle condition, Voc is pulled down to VEE to minimize the power dissipation across the load

resistors connected to RX

± and CD±pins.

3. For a minimum pulse width of

³40 ns.