HDMP-1636 参数 Datasheet PDF下载

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

C

INPUT

O_TTL

V

CC

_TTL

V

CC

_TTL

Parameter

Input Capacitance on TTL Input Pins

Units

pF

I_TTL

Typ.

1.6

Max.

R

R

V

CC

_TX

or

V

CC

_RX

R

R

R

V

BB

1.4 V

GND

GND_TTL

ESD

PROTECTION

ESD

PROTECTION

GND_TTL

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

HS_OUT

V

CC

_TXHS

V

CC

_TXECL

V

CC

_TX

+DOUT

R

PAD

150

-DOUT

R

PAD

150

Zo = 75

Ω

0.01

GND

ESD

PROTECTION

HS_IN

V

CC

_RXHS

+

–

R

R

Zo = 75

Ω

0.01

+DIN

+

–

V

CC

_RX

-DIN

GND

ESD

PROTECTION

150

GND_TXHS

GND_RXHS

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