HDMP-1685A Datasheet, PDF (10/21 Pages) Agilent(Hewlett-Packard) – 1.25 Gbps Four Channel SerDes with 5-pin DDR SSTL-2 Parallel Interface

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
Parameter
Units
Min.
Typ.
Max.
VREFT
SSTL_2 Input Reference Voltage
V
1.15
1.25
1.35
V_IH
Input High Voltage
V
VREFT +0.18
VDDQ +0.30
V_IL
Input Low Voltage
V
–0.30
VREFT –0.18
VREFR
SSTL_2 Output Reference Voltage
V
1.15
1.25
1.35
V_OH
Output High Voltage
V
VREFR +0.38
VDDQ
V_OL
Output Low Voltage
V
GND
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
Parameter
Units
t_r,RFCT
RFCT LVTTL Input Rise Time, 0.8 to 2.0 Volts
ns
t_f,RFCT
RFCT LVTTL Input Fall Time, 2.0 to 0.8 Volts
ns
t_r,SSTLo
SSTL Output Rise Time, 1.0 V to 1.6 V
ns
t_f,SSTLo
SSTL Output Fall Time, 1.6 V to 1.0 V
ns
t_{rs, HS_OUT}
HS_OUT Single-Ended (SO[0:3]±) Rise Time (20% - 80%) ps
t_{fs, HS_OUT}
HS_OUT Single-Ended (SO[0:3]±) Fall Time (20% - 80%) ps
t_{rd, HS_OUT}
HS_OUT Differential Rise Time
ps
t_{fd, HS_OUT}
HS_OUT Differential Fall Time
ps
V_{IP,HS_IN}
HS_IN (SI[0:3]±) Input Peak-To-Peak Differential Voltage mV
V_{OP,HS_OUT[1]} HS_OUT Output Pk-Pk Diff. Voltage (Z0=50 Ohms, Fig.10) mV
Min.
Typ.
Max.
0
2.4
0
2.4
0.4
1.5
0.28
1.5
85
205
300
85
180
300
85
300
85
300
200
1200
2000
1000
1300
1800
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.
X1
120.0 ps/div
X2
130.3664 ns
Y
X
1 (f2) = –637.00 mV 130.549 ns
2 (f2) = 636.00 mV 131.349 ns
∆ = 1.27300 V 800 ps
1/∆X = 1.250 GHz
WAVEFORM MATH
f1 = 3 – 4
f2 = 1 – 2
FUNCTION
f1
f2
DEFINE
FUNCTION...
DISPLAY
off
on
VERTICAL SCALE
auto manual
Y SCALE
250 mV/div
Y OFFSET
0.0 V
Figure 7. Eye diagram of a high speed differential output.
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