IS42S16400F-6TL ISSI, Integrated Silicon Solution Inc, IS42S16400F-6TL Datasheet - Page 33

• Manufacturer Part Number: IS42S16400F-6TL
• Description: IC SDRAM 64MBIT 166MHZ 54TSOP
• Manufacturer: ISSI, Integrated Silicon Solution Inc
• Type: SDRAMr

Specifications of IS42S16400F-6TL

• Format - Memory: RAM
• Memory Type: SDRAM
• Memory Size: 64M (4M x 16)
• Speed: 166MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 54-TSOP II
• Organization: 4Mx16
• Density: 64Mb
• Address Bus: 14b
• Access Time (max): 6/5.4ns
• Maximum Clock Rate: 166MHz
• 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: 130mA
• Pin Count: 54
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 166 MHz
• Access Time: 6 ns, 5.4 ns
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Current: 130 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 706-1075; IS42S16400F-6TL

IS42S16400F
IC42S16400F
BURST READ/SINGLE WRITE
The burst read/single write mode is entered by programming
the write burst mode bit (M9) in the mode register to a logic
1. In this mode, all WRITE commands result in the access
of a single column location (burst of one), regardless of
the programmed burst length. READ commands access
columns according to the programmed burst length and
sequence, just as in the normal mode of operation (M9
= 0).
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. ISSI
Fig CAP 1 - READ With Auto Precharge interrupted by a READ
Integrated Silicon Solution, Inc. — www.issi.com
Rev. A
03/19/08
Fig CAP 2 - READ With Auto Precharge interrupted by a WRITE
Internal States
Internal States
COMMAND
COMMAND
ADDRESS
ADDRESS
BANK m
BANK m
BANK n
BANK n
DQM
CLK
CLK
DQ
DQ
WRITE - AP
BANK n,
BANK n,
T0
Page Active
T0
BANK n
COL a
COL a
NOP
Page Active
CAS Latency - 3 (BANK n)
READ - AP
BANK n
T1
T1
NOP
Page Active
Page Active
READ with Burst of 4
READ with Burst of 4
CAS Latency - 3 (BANK n)
T2
T2
NOP
NOP
READ - AP
BANK m
T3
T3
NOP
D
OUT
a
CAS Latency - 3 (BANK m)
SDRAMs support CONCURRENT AUTO PRECHARGE.
Four cases where CONCURRENT AUTO PRECHARGE
occurs are defined below.
READ with Auto Precharge
1. Interrupted by a READ (with or without auto precharge):
2.Interrupted by a WRITE (with or without auto precharge):
Interrupt Burst, Precharge
A READ to bank m will interrupt a READ on bank n,
begin when the READ to bank m is registered.
A WRITE to bank m will interrupt a READ on bank n
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.
CAS latency later. The PRECHARGE to bank n will
WRITE - AP
BANK m,
BANK m,
BANK m
T4
T4
NOP
COL b
COL b
D
D
IN
t
OUT
RP - BANK n
READ with Burst of 4
b
a
Interrupt Burst, Precharge
WRITE with Burst of 4
T5
T5
D
NOP
NOP
D
IN
OUT
t
b+1
RP - BANK n
a+1
T6
T6
D
NOP
NOP
D
IN
OUT
b+2
b
DON'T CARE
DON'T CARE
Idle
T7
T7
D
NOP
NOP
D
Write-Back
IN
Precharge
OUT
b+3
t
t
RP - BANK m
RP - BANK m
b+1
Idle
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