參數(shù)資料
型號: MCIMX537CVV8C
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 800 MHz, RISC PROCESSOR, PBGA529
封裝: 19 X 19 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, TEPBGA-529
文件頁數(shù): 106/172頁
文件大?。?/td> 4562K
代理商: MCIMX537CVV8C
Electrical Characteristics
i.MX53 Applications Processors for Industrial Products, Rev. 3
Freescale Semiconductor
39
4.5.2
LPDDR2 I/O AC Electrical Characteristics
The DDR2/LVDDR2 interface mode fully complies with JESD79-2E DDR2 JEDEC standard release
April, 2008. The DDR3 interface mode fully complies with JESD79-3D DDR3 JEDEC standard release
April, 2008.
Table 22 shows the AC parameters for LPDDR2 I/O operating in DDR2 mode.
Output Pad Transition Times (Low Drive)
tr, tf
15 pF
35 pF
——
4.82/4.5
10.54/9.95
ns
Output Pad Slew Rate (Max Drive)1
tps
15 pF
35 pF
0.69/0.78
0.36/0.39
——
V/ns
Output Pad Slew Rate (High Drive)1
tps
15 pF
35 pF
0.55/0.62
0.28/0.30
——
V/ns
Output Pad Slew Rate (Medium Drive)1
tps
15 pF
35 pF
0.39/0.44
0.19/0.20
——
V/ns
Output Pad Slew Rate (Low Drive)1
tps
15 pF
35 pF
0.21/0.22
0.09/0.1
——
V/ns
Output Pad di/dt (Max Drive)
tdit
70
mA/ns
Output Pad di/dt (High Drive)
tdit
53
mA/ns
Output Pad di/dt (Medium drive)
tdit
35
mA/ns
Output Pad di/dt (Low drive)
tdit
18
mA/ns
Input Transition Times2
trm
25
ns
1 tps is measured between VIL to VIH for rising edge and between VIH to VIL for falling edge.
2 Hysteresis mode is recommended for inputs with transition time greater than 25 ns.
Table 22. LPDDR2 I/O DDR2 mode AC Characteristics1
1 Note that the JEDEC SSTL_18 specification (JESD8-15a) for class II operation supersedes any specification in this
document.
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
AC input logic high
Vih(ac)
Vref+0.25
——
V
AC input logic low
Vil(ac)
——
Vref-0.25
V
AC differential input voltage2
Vid(ac)
0.5
OVDD
V
Input AC differential cross point voltage3
Vix(ac)
Vref 0.175
—Vref + 0.175
V
Output AC differential cross point voltage4
Vox(ac)
Vref 0.125
—Vref + 0.125
V
Single output slew rate
tsr
At 25
Ω to Vref
0.4
2
V/ns
Skew between pad rise/fall asymmetry +
skew caused by SSN
tSKD
clk=266Mhz
clk=400Mhz
——
0.2
0.1
ns
Table 21. GPIO I/O AC Parameters Fast Mode (continued)
Parameter
Symbol
Test
Condition
Min
Typ
Max
Unit
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