10

Figure 9. O-TTL and I-TTL simplified circuit schematic.

Figure 10. HS_OUT and HS_IN simplified circuit schematic.

VBB 1.4 V

GND

VCC

ESD

PROTECTION

GND

VCC

O_TTL

I_TTL

GND

ESD

PROTECTION

VCC

VCC

0.01 µF

Zo = 50

Ω

Zo = 50

Ω

VCC

VCP

GND

GND

SI[0:3]+

SI[0:3]–

*ESD

PROTECTION

+

–

+

–

HS_IN

2 * Zo = 100

Ω

VCC

GND

GND

VCC

NOTES:

1. HS_IN INPUTS SHOULD NEVER BE CONNECTED TO GROUND AS PERMANENT DAMAGE TO THE DEVICE MAY RESULT.

2. CAPACITORS MAY BE PLACED AT THE SENDING END OR THE RECEIVING END.

HS_OUT

ESD

PROTECTION

SO[0:3]+

Zo

Zo

SO[0:3]–

0.01 µF