HI-1575
AC ELECTRICAL CHARACTERISTICS
VDD = 3.3 V, GND = 0V, TA =Operating Temperature Range (unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
TRANSMITTER (Measured at Point “AD” in Figure 12)
RiseTtime
tr
tf
35 ohm load
35 ohm load
100
100
300
300
ns
ns
Fall Time
RECEIVER (See figures 8 and 9)
Sync Transition Span
tR1
tR2
tR3
tFH
tFR
tRF
1500
500
ns
ns
ns
ns
ns
ns
Short Data Transition Span
Long Data Transition Span
Delay Mid-Parity to Flag Set
Flag Setup Time to Read
Flag Reset Delay
1000
2500
60
0
DATA BUS TIMING - WRITE (See figure 10)
Strobe STRB Pulse Width
REG Write Setup Time
tSTR
tRWS
tRWH
tDWS
tDWH
50
50
10
50
10
50
10
50
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
REG Write Hold Time
Databus / SYNC Write Setup Time
Databus / SYNC Write Hold Time
CHA/CHB Write Setup Time
CHA/CHB Write Hold Time
R/W Write Setup Time
tCHWS
tCHWH
tRWWS
tRWWH
R/W Write Hold Time
DATA BUS TIMING - READ (See figure 11)
Strobe STRB Pulse Width
REG Read Setup Time
tSTR
tRRS
50
50
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
REG Read Hold Time
tRRH
Data Read to Databus Valid
Data Read to Databus Tri-state
CHA/CHB Read Setup Time
CHA/CHB Read Hold Time
R/W Read Setup Time
tDRV
60
60
tDRT
0
tCHRS
tCHRH
tRWRS
tRWRH
50
10
50
10
R/W Read Hold Time
HI-1575 TRANSMITTER
1:2.5
55 W
55 W
BUSA/B
35 W
Point “AD“
BUSA/B
Isolation
Transformer
HI-1575 RECEIVER
2.5:1
55 W
Point “AD“
35 W
55 W
Isolation
Transformer
FIGURE 12. DIRECT COUPLED TEST CIRCUITS
HOLT INTEGRATED CIRCUITS
9
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
