Fujitsu MCM3130SS Manual Do Utilizador

C156-E228-02EN 7-11 

(1)  Driver and receiver 

For the interface signal driver, an open-collector or tri-state buffer circuit that 
satisfies the following output characteristics is used. All signals are negative logic 
(true = "L"). 

The receiver and non-driver of the SCSI device under the power-on state should 
satisfy the following input characteristics on each signal. 

Output characteristics 

V

OL

 = 0.0 to 0.50 VDC (@ I

OL

 = 48 mA) 

V

OH

 = 2.5 to 5.25 VDC 

Input characteristics  

V

IL

 = 0.0 to 0.80 VDC 

I

IL

 = –0.4 to 0.0 mA (@ V

I

 = 0.5 VDC) 

V

IH

 = 2.0 to 5.25 VDC 

I

IH

 = 0.0 to 0.1  mA (@ V

I

 = 2.7 VDC) 

Input hysteresis = 0.2 VDC min. 
Input capacitance = 25 

P

F max. 

Note: 

The SCSI device under the power-off state should satisfy the 
characteristics of I

IL 

and I

IH

. 

Recommended circuit 

Driver: 

MB463 (Fujitsu) or SN7438 (TI) (Open-collector NAND gate) 

Receiver:  SN74LS240 or SN74LS19 (TI) (Schmitt trigger input inverter)