MCIMX25 Datasheet, PDF (42/154 Pages) Freescale Semiconductor, Inc – i.MX25 Applications Processor for Automotive Products

2. Minimum condition for tps: wcs model, 1.1 V, I/O 1.7 V, and 105 °C. tps is measured between VIL to VIH for rising edge and
between VIH to VIL for falling edge.
3. Maximum condition for tdit: bcs model, 1.3 V, I/O 1.9 V, and –40 °C.
4. Maximum condition for tpi and trfi: wcs model, 1.1 V, I/O 1.7 V and 105 °C. Minimum condition for tpi and trfi: bcs model, 1.3 V,
I/O 1.9 V and –40 °C. Input transition time from pad is 5 ns (20%–80%).
Table 31 shows the AC requirements for DDR2 I/O.
Table 31. AC Requirements for DDR2 I/O
Parameter¹
Symbol
Min.
Max.
Units
AC input logic high
VIH(ac)
OVDD/2 + 0.25
OVDD + 0.3
V
AC input logic low
VIL(ac)
–0.3
OVDD/2 – 0.25
V
AC differential input voltage²
Vid(ac)
0.5
OVDD + 0.6
V
AC differential cross point voltage for input³
Vix(ac)
OVDD/2–0.175
OVDD/2 + 0.175
V
AC differential cross point voltage for output⁴
Vox(ac)
OVDD/2–0.125
OVDD/2 + 0.125
V
1 _{Note that the Jedec SSTL_18 specification (JESD8-15a) for an SSTL interface for class II operation supersedes any}
specification in this document.
2 _{Vid(ac) specifies the input differential voltage |Vtr–Vcp| required for switching, where Vtr is the “true” input signal and Vcp is}
the “complementary” input signal. The minimum value is equal to Vih(ac)–Vil(ac)
3 _{The typical value of Vix(ac) is expected to be about 0.5 × OVDD. and Vix(ac) is expected to track variation of OVDD. Vix(ac)}
indicates the voltage at which differential input signal must cross.
4 _{The typical value of Vox(ac) is expected to be about 0.5 × OVDD and Vox(ac) is expected to track variation in OVDD. Vox(ac)}
indicates the voltage at which differential output signal must cross. Cload = 25 pF.
3.7 Module Timing and Electrical Parameters
This section contains the timing and electrical parameters for i.MX25 modules.
3.7.1 1-Wire Timing Parameters
Figure 7 shows the reset and presence pulses (RPP) timing for 1-Wire.
1-Wire bus
(OWIRE_LINE)
1-Wire Tx
“Reset Pulse”
1-Wire Memory Device
“Presence Pulse”
OW2
OW1
OW3
OW4
Figure 7. 1-Wire RPP Timing Diagram
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 7
42
Freescale Semiconductor