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SPEAR1340 датащи(PDF) 144 Page - STMicroelectronics

номер детали SPEAR1340
подробное описание детали  Dual-core Cortex A9 HMI embedded MPU
PDF  200 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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SPEAR1340 датащи(HTML) 144 Page - STMicroelectronics

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Electrical characteristics
SPEAr1340
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Doc ID 023063 Rev 4
4.4.3
DDR2 and DDR3 mode I/O buffers
This section is applicable to I/O pins of type SSTL (SSTL 1V5/1V8).
The DDR2/DDR3 buffers can work either with 1.8 V supply in DDR2 applications or 1.5 V in
DDR3 applications.
Features
●
1.5 V and 1.8 V signaling
●
Pseudo-differential input for data and fully-differential input for strobe.
●
On-die termination (ODT) functionality, in order to integrate the parallel resistor inside
the die and improve signal integrity.
AC/DC characteristics
Table 51 shows the AC/DC characteristics of DDR2 and DDR3 buffers.
Table 51.
DDR2/DDR3 AC/DC driver characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD DDR
DDR2 1V8
supply
voltage
-
1.7
1.8
1.9
V
DDR3 1V5
supply
voltage
-
1.4
1.5
1.6
V
ZOUT
Output
impedance
Vpad= VDD DDR/2
REXT= 332
Mandatory
34.3-10% = 30.9
34.3
34.3 + 10% = 37.7
Ω
VOH (AC)
High level
output voltage
-
DDR2: VDD DDR/2 + 0.2
--
V
DDR3: VDD DDR/2 + 0.175
VOL (AC)
Low level
output voltage
--
-
DDR2: VDD DDR/2-02
V
-
DDR3: VDD DDR/2- 0.175
VOH (DC)
High level
output voltage
-
DDR2: VDD DDR/2 + 0.125
--
V
DDR3: VDD DDR/2 + 0.1
VOL (DC)
Low level
output voltage
--
-
DDR2: VDD DDR/2 - 0.125
V
-
DDR3: VDD DDR/2 - 0.1



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