CY7C1426AV18-167BZXC Cypress Semiconductor Corp, CY7C1426AV18-167BZXC Datasheet - Page 19

• Manufacturer Part Number: CY7C1426AV18-167BZXC
• Description: IC SRAM 36MBIT 167MHZ 165TFBGA
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C1426AV18-167BZXC

• Format - Memory: RAM
• Memory Type: SRAM - Synchronous, QDR II
• Memory Size: 36M (4M x 9)
• Speed: 167MHz
• Interface: Parallel
• Voltage - Supply: 1.7 V ~ 1.9 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 165-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document Number: 38-05614 Rev. *C
Power-Up Sequence in QDR-II SRAM
QDR-II SRAMs must be powered up and initialized in a
predefined manner to prevent undefined operations.
Power-Up Sequence
Power-up Waveforms
Notes:
15. It is recommended that the DOFF pin be pulled HIGH via a pull up resistor of 1Kohm.
16. During Power-Up, when the DOFF is tied HIGH, the DLL gets locked after 1024 cycles of stable clock.
• Apply power and drive DOFF LOW (All other inputs can be
• After the power and clock (K, K, C, C) are stable take DOFF
• The additional 1024 cycles of clocks are required for the
V
HIGH or LOW)
— Apply V
— Apply V
HIGH
DLL to lock.
DD
/
DOFF
V
DDQ
K
K
DD
DDQ
before V
before V
DDQ
REF
Unstable Clock
Clock Start (Clock Starts after
or at the same time as V
V
DD
[15, 16]
/
V
DDQ
REF
Stable (< +/- 0.1V DC per 50ns )
V
DD
/
V
DLL Constraints
DDQ
• DLL uses either K or C clock as its synchronizing input.The
• The DLL will function at frequencies down to 80MHz.
• If the input clock is unstable and the DLL is enabled, then
Fix High (or tied to V DDQ )
input should have low phase jitter, which is specified as
t
the DLL may lock to an incorrect frequency, causing
unstable SRAM behavior
KC Var
> 1024 Stable clock
Stable)
.
.
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Operation
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