HDMP-1646 Ver la hoja de datos (PDF) - HP => Agilent Technologies

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componentes Descripción

Fabricante

HDMP-1646

Gigabit Ethernet Transceiver Chip

HP => Agilent Technologies 

I/O Type Definitions

I/O Type

I-TTL

O-TTL

HS_OUT

HS_IN

C

S

Definition

Input TTL, Floats High When Left Open

Output TTL

High Speed Output, ECL Compatible

High Speed Input

External Circuit Node

Power Supply or Ground

HDMP-1636/46 (TRx)

Pin Input Capacitance

Symbol

CINPUT

Parameter

Input Capacitance on TTL Input Pins

O_TTL

VCC_TTL

Units

pF

I_TTL

VCC_TTL

R

R

VCC_TX

or

VCC_RX

R

R

Typ.

1.6

Max.

R

GND_TTL

ESD

PROTECTION

GND

ESD

PROTECTION

GND_TTL

VBB 1.4 V

Figure 9. O-TTL and I-TTL Simplified Circuit Schematic.

HS_OUT

ESD

PROTECTION

VCC_TXHS

VCC_TXECL

VCC_RXHS

VCC_TX

VCC_RX

+DOUT

150

RPAD

Zo = 75 Ω

0.01

150

+DIN

-DOUT

GND

150

RPAD

Zo = 75 Ω

0.01

-DIN

GND

GND_TXHS

GND_RXHS

HS_IN

+

–+

–

R

R

ESD

PROTECTION

Figure 10. HS_OUT and HS_IN Simplified Circuit Schematic.

Notes:

1. HS_IN inputs should never be connected to ground as permanent damage to the device may result.

2. The optional series padding resistors (Rpad) help dampen load reflections. Typical Rpad values for mismatched loads range

between 25-75 Ω.

720

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