mcimx50 Freescale Semiconductor, Inc, mcimx50 Datasheet - Page 44

• Manufacturer Part Number: mcimx50
• Description: I.mx50 Applications Processors For Consumer Products
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
4.5.8
Table 31
4.5.9
Table 32
44
AC input logic high
AC input logic low
AC differential input high voltage
AC differential input low voltage
AC input differential cross point voltage (relative
to ovdd / 2)
Over/undershoot peak
Over/undershoot area (above OVDD or below
OVSS)
Output propagation delay high to low
Output propagation delay low to high
Input propagation delay high to low
Input propagation delay low to high
shows the AC parameters for LPDDR1 I/O.
shows the AC parameters for LPDDR2 I/O.
LPDDR1 I/O AC Parameters
LPDDR2 I/O AC Parameters
AC input logic high
AC input logic low
AC input differential voltage
AC input differential crosspoint voltage
Output propagation delay high to low
Output propagation delay low to high
Input propagation delay high to low
Input propagation delay low to high
Single output slew rate
1
the “true” input signal and Vcp is the “complementary” input signal. The Minimum value is
equal to Vih(ac)-Vil(ac)
2
track variation of ovdd. Vix(ac) indicates the voltage at which differential input signal must
cross.
Vid(ac) specifies the input differential voltage |Vtr-Vcp| required for switching, where Vtr is
The typical value of Vix(ac) is expected to be about 0.5*ovdd. and Vix(ac) is expected to
2
Parameter
Parameter
i.MX50 Applications Processors for Consumer Products, Rev. 0
Table 31. LPDDR1 I/O AC Parameters
Table 32. LPDDR2 I/O AC Parameters
1
1
2
Vihd(ac)
Symbol
Vild(ac)
Vid(ac)
Vix(ac)
t
t
t
t
POHLD
POLHD
PIHLD
PILHD
tsr
Vidhl(ac)
Vidh(ac)
Symbol
Vih(ac)
Vix(ac)
t
t
Vil(ac)
Vpeak
Varea
t
t
POHLD
POLHD
PIHLD
PILHD
0.8*ovdd
0.6*ovdd
0.4*ovdd
Min
-0.3
0.3
Vref+0.22
-0.12
ovss
0.44
Min
-
ovdd+0.3
ovdd+0.6
0.2*ovdd
0.6*ovdd
Max
0.6 (at 266
2.5
2.5
2.5
1.5
1.5
Vref-0.22
MHz)
ovdd
Max
0.44
0.12
0.35
3.5
3.5
1.5
1.5
-
Freescale Semiconductor
Unit
V/ns
ns
V
V*ns
Unit
ns
ns
V