IS42S32800B-7T ISSI, Integrated Silicon Solution Inc, IS42S32800B-7T Datasheet - Page 13
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IS42S32800B-7T
Manufacturer Part Number
IS42S32800B-7T
Description
IC SDRAM 256MBIT 143MHZ 86TSOP
Manufacturer
ISSI, Integrated Silicon Solution Inc
Type
SDRAMr
Datasheet
1.IS42S32800B-7BL.pdf
(62 pages)
Specifications of IS42S32800B-7T
Format - Memory
RAM
Memory Type
SDRAM
Memory Size
256M (8Mx32)
Speed
143MHz
Interface
Parallel
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Package / Case
86-TSOPII
Organization
8Mx32
Density
256Mb
Address Bus
14b
Access Time (max)
5.5ns
Maximum Clock Rate
143MHz
Operating Supply Voltage (typ)
3.3V
Package Type
TSOP-II
Operating Temp Range
0C to 70C
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
3V
Supply Current
150mA
Pin Count
86
Mounting
Surface Mount
Operating Temperature Classification
Commercial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
IS42S32800B-7TL
Manufacturer:
ISSI
Quantity:
1 000
Part Number:
IS42S32800B-7TL
Manufacturer:
ISSI
Quantity:
20 000
Company:
Part Number:
IS42S32800B-7TLI
Manufacturer:
ISSI
Quantity:
1 000
IS42S32800B
6
Integrated Silicon Solution, Inc.
Rev. F
07/21/09
Concurrent Auto Precharge
An access command (READ or WRITE) to another bank while an access command with auto precharge enabled
is executing is not allowed by SDRAMs, unless the SDRAM supports CONCURRENT AUTO PRECHARGE.
ICSI SDRAMs support CONCURRENT AUTO PRECHARGE. Four cases where CONCURRENT AUTO
PRECHARGE occurs are defined below.
READ with Auto Precharge
· Interrupted by a READ (with or without auto precharge): A READ to bank m will interrupt a READ on bank n,
· Interrupted by a WRITE (with or without auto precharge): A WRITE to bank m will interrupt a READ on bank n
CAS latency later. The PRECHARGE to bank n will begin when the READ to bank m is regis-tered.
when registered. DQM should be used two clocks prior to the WRITE command to prevent bus contention. The
PRECHARGE to bank n will begin when the WRITE to bank m is registered.
Internal
States
Internal
States
NOTE: 1. DQM is HIGH at T2 to prevent D
NOTE: DQM is LOW.
READ With Auto Precharge Interrupted by a WRITE
READ With Auto Precharge Interrupted by a READ
COMMAND
ADDRESS
BANK m
COMMAND
BANK n
ADDRESS
BANK m
BANK n
CLK
DQM
DQ
CLK
DQ
1
Active
Page
READ - AP
BANK n,
Page Active
T0
BANK n
NOP
COL a
T0
READ with Burst of 4
CAS Latency = 3 (BANK n)
READ - AP
Page Active
BANK n,
Page Active
T1
BANK n
NOP
COL a
T1
OUT
READ with Burst of 4
CAS Latency = 3 (BANK n)
-a+1 from contending with D
T2
NOP
T2
NOP
T3
D
NOP
OUT
a
BANK m,
READ - AP
T3
BANK m
COL d
Interrupt Burst, Precharge
CAS Latency = 3 (BANK m)
READ with Burst of 4
BANK m,
WRITE - AP
COL d
BANK m
T4
D
d
IN
IN
Interrupt Burst, Precharge
WRITE with Burst of 4
-d at T4.
T4
NOP
D
T5
OUT
a
t
d + 1
RP - BANK n
NOP
D
IN
t
RP - BANK n
T5
NOP
T6
D
a + 1
d + 2
NOP
D
OUT
IN
DON’T CARE
T6
NOP
T7
t WR - BANK m
d + 3
NOP
D
D
IN
OUT
Write-Back
d
Idle
DON T CARE
Idle
T7
NOP
t RP - BANK m
Precharge
D
d + 1
OUT
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