DUAL LVCMOS / LVTTL-TODIFFERENTIAL
HSTL TRANSLATOR
85222-01 DATA SHEET
4 REVISION A 5/7/15
TABLE 4A. AC CHARACTERISTICS, V
DD
= 3.3V±5%, TA = 0°C TO 70°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
f
MAX
Output Frequency 350 MHz
t
PD
Propagation Delay; NOTE 1 700 1075 ps
tsk(pp) Part-to-Part Skew; NOTE 2, 3 375 ps
t
R
/ t
F
Output Rise/Fall Time 20% to 80% 150 800 ps
odc Output Duty Cycle
ƒ 150MHz 48 52 %
150 < ƒ 250MHz
46 54 %
250 < ƒ 350MHz
45 55 %
NOTE 1: Measured from V
DD
/2 of the input to the differential output crossing point.
NOTE 2: Defi ned as skew between outputs on different devices operating at the same supply voltages and with equal load
conditions. Using the same type of inputs on each device, the outputs are measured at the differential cross points.
NOTE 3: This parameter is defi ned in accordance with JEDEC Standard 65.
TABLE 4B. AC CHARACTERISTICS, V
DD
= 2.5V±5%, TA = 0°C TO 70°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
f
MAX
Output Frequency 350 MHz
t
PD
Propagation Delay; NOTE 1 700 1200 ps
tsk(pp) Part-to-Part Skew; NOTE 2, 3 475 ps
t
R
/ t
F
Output Rise/Fall Time 20% to 80% 150 800 ps
odc Output Duty Cycle
ƒ 150MHz
48 52 %
150 < ƒ 350MHz
46 54 %
NOTE 1: Measured from V
DD
/2 of the input to the differential output crossing point.
NOTE 2: Defi ned as skew between outputs on different devices operating at the same supply voltages and with equal load
conditions. Using the same type of inputs on each device, the outputs are measured at the differential cross points.
NOTE 3: This parameter is defi ned in accordance with JEDEC Standard 65.
REVISION A 5/7/15
85222-01 DATA SHEET
5 DUAL LVCMOS / LVTTL-TODIFFERENTIAL
HSTL TRANSLATOR
PARAMETER MEASUREMENT INFORMATION
2.5V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT
PROPAGATION DELAY
OUTPUT RISE/FALL TIME
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
PART-TO-PART SKEW
DUAL LVCMOS / LVTTL-TODIFFERENTIAL
HSTL TRANSLATOR
85222-01 DATA SHEET
6 REVISION A 5/7/15
APPLICATION INFORMATION
Figure 1 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
DD
/2 is
generated by the bias resistors R1, R2 and C1. This bias circuit
should be located as close as possible to the input pin. The ratio
FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
of R1 and R2 might need to be adjusted to position the V_REF
in the center of the input voltage swing. For example, if the input
clock swing is only 2.5V and V
CC
= 3.3V, V_REF should be 1.25V
and R2/R1 = 0.609.
INPUTS:
CLK I
NPUT:
For applications not requiring the use of a clock input, it can be
left fl oating. Though not required, but for additional protection, a
1kΩ resistor can be tied from the CLK input to ground.
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
OUTPUTS:
HSTL OUTPUT
All unused LVHSTL outputs can be left fl oating. We recommend
that there is no trace attached. Both sides of the differential
output pair should either be left fl oating or terminated.

85222AM-01LF

Mfr. #:
Manufacturer:
Description:
Translation - Voltage Levels DUAL 1 HSTL OUT BUFFER
Lifecycle:
New from this manufacturer.
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