HDMP-1685A SSTL_2 I/O DC Electrical Parameters
T
A
= 0°C to T
C
= 85°C, V
CC
= 3.15 V to 3.45 V, VDDQ = 2.30 V to 2.70 V. VDDQ is the FC-1/MAC device I/O supply voltage.
SSTL-2 inputs can receive LVTTL signals successfully. SSTL-2 outputs do not output LVTTL compliant levels.
Symbol
VREFT
V
IH
V
IL
VREFR
V
OH
V
OL
Parameter
SSTL_2 Input Reference Voltage
Input High Voltage
Input Low Voltage
SSTL_2 Output Reference Voltage
Output High Voltage
Output Low Voltage
Units
V
V
V
V
V
V
Min.
1.15
VREFT +0.18
–0.30
1.15
VREFR +0.38
GND
1.25
Typ.
1.25
Max.
1.35
VDDQ +0.30
VREFT –0.18
1.35
VDDQ
VREFR –0.38
HDMP-1685A AC Electrical Specifications (TRx)
T
A
= 0°C to T
C
= 85°C, V
CC
= 3.15 V to 3.45 V
Symbol
t
r,RFCT
t
f,RFCT
t
r,SSTLo
t
f,SSTLo
t
rs, HS_OUT
t
fs, HS_OUT
t
rd, HS_OUT
t
fd, HS_OUT
V
IP,HS_IN
V
OP,HS_OUT [1]
Parameter
RFCT LVTTL Input Rise Time, 0.8 to 2.0 Volts
RFCT LVTTL Input Fall Time, 2.0 to 0.8 Volts
SSTL Output Rise Time, 1.0 V to 1.6 V
SSTL Output Fall Time, 1.6 V to 1.0 V
HS_OUT Single-Ended (SO[0:3]±) Fall Time (20% - 80%)
HS_OUT Differential Rise Time
HS_OUT Differential Fall Time
Units
ns
ns
ns
ns
85
85
85
85
200
1000
1200
1300
ps
ps
ps
Min.
0
0
0.4
0.28
205
180
Typ.
Max.
2.4
2.4
1.5
1.5
300
300
300
300
2000
1800
HS_OUT Single-Ended (SO[0:3]±) Rise Time (20% - 80%) ps
HS_IN (SI[0:3]±) Input Peak-To-Peak Differential Voltage mV
HS_OUT Output Pk-Pk Diff. Voltage (Z0=50 Ohms, Fig.10) mV
Note:
1. Output Peak-to-Peak Differential Voltage specified as SO[0:3]+ minus SO[0:3]–. The amplitude will be 25% higher when terminating into 75
Ω
loads.
WAVEFORM MATH
f1 = 3 – 4
f2 = 1 – 2
FUNCTION
f1
f2
X1
X2
DEFINE
FUNCTION...
DISPLAY
off
on
VERTICAL SCALE
auto
120.0 ps/div
Y
1 (f2) = –637.00 mV
2 (f2) = 636.00 mV
∆
=
130.3664 ns
X
130.549 ns
131.349 ns
250 mV/div
Y OFFSET
0.0 V
manual
Y SCALE
800 ps
1.27300 V
= 1.250 GHz
1/∆X
Figure 7. Eye diagram of a high speed differential output.
9
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