
17
SCDCT2578  REV B   3/11/98
OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS
V
DD
 Supply voltage                                        +7    
V
SS
 Supply voltage                                         0          
V
IH
 High level input voltage            
V
IL
 Low level input voltage                
Operating free air temperature range    
Storage temperature range                   
Volts
Volts
Volts
Volts
C
C
V
DD
+0.5   
V
SS
-0.5      
 -55 to +125
 -65 to +150
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
V
DD
  Supply voltage    
Free air temperature range  
4.75 5.0 
-55           
5.5   
+125
Volts
 C
ELECTRICAL CHARACTERISTICS
DIGITAL SIGNALS
MIN NOM MAX UNIT
A1.  INPUT WITH PULL UP
V
IH
 High level input voltage  
V
IL
 Low level input voltage    
I
IH
High level input current                           
I
IL
  Low level input current    
C
IN
 Input capacitance                          
2.4         
V
SS
              0.8      Volts
oc       Volts
10
120
10
uA
uA
pf
35    65  
A2.  INPUT WITH PULL UP
V
IH
 High level input voltage  
V
IL
 Low level input voltage    
I
IH
High level input current                      
I
IL
Low level input current  
C
IN
 Input capacitance                                  
2.4               oc       Volts
V
SS
             0.8     Volts
10 
uA
uA
pf
450   800   1500
10
B.  INPUT WITH PULL DOWN
V
IH
 High level input voltage   
V
IL
 Low level input voltage     
I
IH
High level input current    
I
IL
Low level input current                           
C
IN
 Input capacitance                                    
2.4            
oc               0.8      Volts
35   
65   
V
DD
   Volts
120 
10
10
uA
uA
pf
C.  OUTPUT
V
OH
 High level output voltage 
V
OL
 Low level output voltage                         
I
OH
High level output current   2.0   5.5   10.0 
I
OL
Low level output current    2.0   5.5
V
DD
-0.5      V
DD
    Volts
0.4    
Volts
mA
mA
10.0
D. OPEN DRAIN OUTPUT
V
OH
 High level output voltage                        
V
OL
 Low level output voltage                         
I
OH
High level output current                        
I
OL
Low level output current    2.0  
oc       Volts
0.4     Volts
10 
10.0
uA
mA
5.5
MIN NOM MAX UNIT
E.  Not Used
F.  INPUT OUTPUT
V
IH
 High level input voltage    
V
IL
 Low level input voltage    
I
IH
High level input current                         
I
IL
  Low level input current                           
C
IN
  Input capacitance                                     
V
OH
 High level output voltage 
V
OL
 Low level output voltage                         
I
OH
High level output current   2.0   5.5   10.0 
I
OL
Low level output current   
I
HZ
High impedance IO current                     
2.4              V
DD
V
SS
              0.8   
Volts
Volts
uA
uA
pf
10 
10
10
V
DD
-0.5       V
DD
    Volts
0.4      Volts
mA
mA
uA
2.0   5.5
10.0
10
G.  INPUT OUTPUT WITH PULL UP
V
IH
 High level input voltage   
V
IL
 Low level input voltage     
I
IH
High level input current                          
I
IL
Low level input current    
C
IN
 Input capacitance                                     
V
OH
 High level output voltage  
V
OL
 Low level output voltage                         
I
OH
High level output current   0.5   1.0   1.8 
I
OL
Low level output current    1.5   5.0
oc              
V
SS
              0.8     Volts
oc     
Volts
10 
uA
uA
pf
Volts
450   800  1500
10
V
DD
-0.5       V
DD
0.4      Volts
mA
mA
9.0
DATA BUS SIGNALS
H. TRANSMITTER
I
O
V
O
Driver peak output current
Differential output level 
point A-A’ (R
L
=35 ohms)
on  1760 BUS
T
RF
 Rise and fall times
(10%-90% of p-p output)
V
OE
 Output offset 2.5 uS after 
mid bit crossing of parity,
point A-A’ (R
L
=35 ohms)
V
O
Differential output level 
point A-A’ (R
L
=35 ohms)
on  1553 BUS
600
9.0
mA
V p-p
7.0
7.5
100
200
300
nS
-90
90
mV
6.0
7.5
9.0
V p-p
H. RECEIVER
V
IDR
 Differential input level
point P-P’ (TXFMR-2.12:1)
C
MRR
 Common mode rejection 
ratio
V
TH
 Input threshold voltage
referred to the bus
(100KHz-1MHz)
14
20
V p-p
 45
dB
0.60
0.82
1.20
V p-p