Datasheet

DTM65521A
2 GB - 256Mx72, 240-Pin FB-DIMM
Document 06054, Revision A, 1-Aug-08, Dataram Corporation © 2008 Page 5
Differential Transmitter Output Specification
Parameter Symbol
MIN MAX Units
Differential peak-to-peak output voltage for large voltage
swing VTX-DIFFp-p =2 * | VTX-D+ - VTX-D- |
VTX-DIFFp-p_L(1)
900 1300 mV
Differential peak-to-peak output voltage for regular voltage
swing VTX-DIFFp-p =2 * | VTX-D+ - VTX-D- |
VTX-DIFFp-p_R(1)
800 --- mV
Differential peak-to-peak output voltage for small voltage
swing VTX-DIFFp-p =2 * | VTX-D+ - VTX-D- |
VTX-DIFFp-p_S(1)
520 --- mV
DC common code output voltage for large voltage swing
Defined as: VTX-CM = DC(avg) of | VTX-D+ + VTX-D- |/2
VTX-CM_L(1)
--- 375 mV
DC common mode output voltage for small voltage swing
Defined as: VTX-CM = DC(avg) of | VTX-D+ + VTX-D- |/2
VTX-CM_S(1)
135 280 mV
De-emphasized differential output voltage ratio for -3.5 dB
de-emphasis -
VTX-DE-3.5-
Ratio(1,2,3)
-3 -4 dB
De-emphasized differential output voltage ratio for -6 dB de-
emphasis
VTX-DE-6-Ratio(1,2,3)
-5 -7 dB
AC peak-to-peak common mode output voltage for large
swing VTX-CM-AC = Max | VTX-D+ + VTX-D- |/2 - Min | VTX-
D+ + VTX-D- |/2
VTX-CM-ACp-p L(1,4)
--- 90 mV
AC peak-to-peak common mode output voltage for regular
swing VTX-CM-AC = Max | VTX-D+ + VTX-D- |/2 - Min | VTX-
D+ + VTX-D- |/2
VTX-CM-ACp-p R(1,4)
--- 80 mV
AC peak-to-peak common mode output voltage for small
swing VTX-CM-AC = Max | VTX-D+ + VTX-D- |/2 - Min | VTX-
D+ + VTX-D- |/2
VTX-CM-ACp-p S(1,4)
--- 70 mV
Maximum single-ended voltage in EI condition, DC + AC
VTX-IDLE-SE(5,6)
--- 50 mV
Maximum single-ended voltage in EI condition, DC only
VTX-IDLE-SE-
DC(5,6,7)
--- 20 mV
Maximum peak-to-peak differential voltage in EI condition
VTX-IDLE-DIFFp-p(6)
--- 40 mV
Single-ended voltage(w.r.t. VSS) on D+/D-
VTX-SE(1,7)
-75 750 mV
Minimum TX eye width, 3.2 and 4 Gb/s
TTX-Eye-MIN(1,9,10)
0.7 --- UI
Maximum TX deterministic jitter, 3.2 and 4 Gb/s
TTX-DJ-DD(1,9,10,11)
--- 0.2 UI
Instantaneous pulse width
TTX-PULSE(12)
0.85 --- UI
Differential TX output rise/fall time
Given by 20%-80% voltage levels
TTX-RISE, TTX-
FALL(1)
30 90 ps
Mismatch between rise and fall times
TTX-RF-MISMATCH
--- 20 ps
Differential return loss
Measured over 0.1 GHz to 2.4GHz
RLTX-DIFF
8 --- dB
Common mode return loss
Measured over 0.1 GHz to 2.4GHz
RLTX-CM
6 --- dB
Transmitter termination resistance
RTX(13)
41 55 Ω
D+/D- TX resistance difference
RTX-Match-DC = 2*| RTX-D+ - RTX-D- |/( RTX-D+ + RTX-D- )
Bounds are applied separately to high and low output
voltage states
RTX-Match-DC
4 %
Lane-to-lane skew at TX
LTX-SKEW 1(14,16) ---
100+3UI ps
Lane-to-lane skew at TX
LTX-SKEW 2(15,16) ---
100+2UI ps
Maximum TX Drift (resync mode)
TTX-DRIFT-
RESYNC(17)
---
240 ps
Maximum TX Drift (resample mode only)
TTX-DRIFT-
RESAMPLE(17)
---
120 ps
Bit Error Ratio
BER(18)
--- 10
-12