Cypress Rambus XDR CY24271 - Manual (Page 8)

CY24272
Document Number: 001-42414 Rev. ** Page 8 of 13
AC Operating Conditions
The AC operating conditions follow.
[6]
Parameter Description Condition Min Max Unit
t
CYCLE,IN
REFCLK, REFCLKB input cycle time REFSEL = 0, /BYPASS = High 9 11 ns
REFSEL = 1, /BYPASS = High 7 8 ns
/BYPASS = Low 4 – ns
t
JIT,IN(cc)
Input Cycle to Cycle Jitter [9] – 185 ps
t
DCIN
[10]
Input Duty Cycle Over 10,000 cycles 40% 60% t
CYCLE
t
RIN
/ t
FIN
Rise and Fall Times Measured at 20%–80% of input
voltage for REFCLK and
REFCLKB inputs 175 700 ps
Δt
RIN
/ t
FIN
Rise and Fall Times Difference – 150 ps
p
MIN
[11]
Modulation Index for triangular modulation – 0.6 %
Modulation Index for non-triangular modulation – 0.5
[12]
%
f
MIN
[11] Input Frequency Modulation 30 33 kHz
t
SR,IN
Input Slew Rate (measured at 20%–80% of
input voltage) for REFCLK 1 4 V/ns
C
IN,REF
Capacitance at REFCLK inputs – 7 pF
C
IN,CMOS
Capacitance at CMOS inputs – 10 pF
f
SCL
SMBus clock frequency input in SCL pin DC 100 kHz
DC Electrical Specifications
Parameter Description Min Typ Max Unit
V
OX
[6]
Differential output crossing point voltage
[13]
– 1.08 – V
V
COS
[6]
Output voltage swing (peak-to-peak single-ended)
[14]
– 400 – mV
V
OL,ABS
Absolute output low voltage at CLK[3:0], CLK[3:0]B
[15]
0.85 – – V
V
ISET
Reference voltage for swing controlled current, I
REF
0.98 1.0 1.02 V
I
DD
[7] Power Supply Current at 2.625V, f
ref
= 100 MHz, and f
out
= 300 MHz – – 85 mA
I
DD
[7]
Power Supply Current at 2.625V, f
ref
= 133 MHz, and f
out
= 667 MHz – – 125 mA
I
OL/
I
REF
Ratio of output low current to reference current
[16]
6.8 7.0 7.2
I
OL,ABS
Minimum current at V
OL,ABS
[17]
25 – – mA
V
OL,SDA
SDA output low voltage at test condition of SDA output low current = 4 mA – – 0.4 V
I
OL,SDA
SDA output low voltage at test condition of SDA voltage = 0.8V 6 – – mA
I
OZ
Current during High Z per pin at CLK[3:0], CLK[3:0]B – – 10
μA
Z
OUT
Output dynamic impedance when clock output signal is at V
OL
= 0.9V
[18]
1000 – –
Ω
Notes
9. Jitter measured at crossing points and is the absolute value of the worst case deviation.
10. Measured at crossing points.
11. If input modulation is used; input modulation is allowed but not required.
12. The amount of allowed spreading for any non-triangular modulation is determined by the induced downstream tracking skew that cannot exceed the skew generated
by the specified 0.6% triangular modulation. Typically, the amount of allowed non-triangular modulation is about 0.5%.
13. V
OX
is measured on external divider network.
14. V
COS
= (clock output high voltage – clock output low voltage), measured on the external divider network.
15. V
OL_ABS
is measured at the clock output pins of the package.
16. I
REF
is equal to V
ISET
/R
RC
.
17. Minimum I
OL,ABS
is measured at the clock output pin with R
RC
= 266 ohms or less.
18. Z
OUT
is defined at the output pins as (0.94V – 0.90V)/(I
0.94
– I
0.90
) under conditions specified for I
OL, ABS
.
[+] Feedback