14
AC ELECTRICAL CHARACTERISTICS
1
VCC = +5V (± 10%)
VCCA = +5V to + 12V (± 5%) or +5V to +15V (± 5%)
VEE = -12V or -15V (± 5%)
-55
°C < T
C < +125°C
SYMBOL
PARAMETER
MINIMUM
MAXIMUM
UNIT
CONDITION
Transmitter Output
Rise/Fall Time
(See figure 10)
100
300
ns
Input
ƒ = 1MHz 50% duty cycle:
direct-coupled RL = 35 ohms output at
10% through 90% points TXOUT,
TXOUT. Figure 3.
tRXDD
RXOUT Delay
-200
+200
ns
RXOUT to RXOUT; Figure 4.
tTXDD
3
TXIN Skew
-25
+25
ns
TXIN to TXIN; Figure 4.
tRZCD
Zero Crossing
-150
+150
ns
Direct-coupled stub; input
ƒ = 1MHz,
3VPP (skew INPUT ± 150ns), rise/fall
time 200ns.
tTZCS
2
Zero Crossing
Stability
(See figure 10)
-25
+25
ns
Input TXIN and TXIN should create
transmitter output zero crossings at
500ns, 1000ns, 1500ns, and 2000ns.
These zero crossings should not devi-
ate more than
± 25ns.
tDXOFF
3,4
Transmitter Off;
Delay from Inhibit
Active
400
ns
TXIN and TXIN toggling @ 1MHz;
TXIHB transitions from logic zero to
one.
tDXON
3,5
Transmitter On;
Delay from Inhibit
Inactive
250
ns
TXIN and TXIN toggling @ 1MHz;
TXIHB transitions from logic one to
zero.
Notes:
1. All tests guaranteed per test figure 6.
2. Guaranteed by device characterization.
3. Supplied as a design limit but not guaranteed or tested.
4. Delay time from transmit inhibit (1.5V) to transmit off (280mV).
5. Delay time from not transmit inhibit (1.5V) to transmit on (1.2V).
Table 3. Transformer Requirements Versus Power Supplies
COUPLING TECHNIQUE
± 12V
DC
± 15V
DC
DIRECT-COUPLED:
Isolation Transformer Ratio
1.2:1
1.4:1
TRANSFORMER-COUPLED:
Isolation Transformer Ratio
1.66:1
2:1
Coupling Transformer Ratio
1:1.4
1:1.4
tR, tF
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