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CXB1582Q

Fibre Channel Receiver

Sony Semiconductor 

CXB1582Q

4. Power-on reset signal (POR∗)

The CXB1582Q has a power-on reset signal output (POR∗). As shown in figure (a) below, this signal is output

at low level for approximately 100ns after the power is turned on, after which it goes to high level and can be

used as the system reset signal. The low level time Tpor can be adjusted by capacitance Crt connected to the

RTCAP pin as shown in figure (b) below. Tpor conforms roughly to the following equation.

Tpor = 90ns × (1 + Crt/10pf)

POR∗ 71

POR∗ Output

Tpor

Power ON

(a)

RTCAP 70

Crt

(b)

Fig. 4. Power-on Reset Signal Setting

– 20 –

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