GS880E36BT-250IV GSI [GSI Technology], GS880E36BT-250IV Datasheet - Page 19
![no-image](/images/no-image-200.jpg)
GS880E36BT-250IV
Manufacturer Part Number
GS880E36BT-250IV
Description
512K x 18, 256K x 32, 256K x 36 9Mb Sync Burst SRAMs
Manufacturer
GSI [GSI Technology]
Datasheet
1.GS880E36BT-250IV.pdf
(23 pages)
Sleep mode is a low current, power-down mode in which the device is deselected and current is reduced to I
Sleep mode is dictated by the length of time the ZZ is in a High state. After entering Sleep mode, all inputs except ZZ become
disabled and all outputs go to High-Z The ZZ pin is an asynchronous, active high input that causes the device to enter Sleep mode.
When the ZZ pin is driven high, I
operations or operations in progress may not be properly completed if ZZ is asserted. Therefore, Sleep mode must not be initiated
until valid pending operations are completed. Similarly, when exiting Sleep mode during tZZR, only a Deselect or Read commands
may be applied while the SRAM is recovering from Sleep mode.
Application Tips
Single and Dual Cycle Deselect
SCD devices force the use of “dummy read cycles” (read cycles that are launched normally, but that are ended with the output
drivers inactive) in a fully synchronous environment. Dummy read cycles waste performance, but their use usually assures there
will be no bus contention in transitions from reads to writes or between banks of RAMs. DCD SRAMs (like this one) do not waste
bandwidth on dummy cycles and are logically simpler to manage in a multiple bank application (wait states need not be inserted at
bank address boundary crossings), but greater care must be exercised to avoid excessive bus contention.
Rev: 1.00 6/2006
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
ADSC
ADSP
CK
ZZ
Setup
Hold
SB
2 is guaranteed after the time tZZI is met. Because ZZ is an asynchronous input, pending
tKC
tKC
tKH
tKH
Sleep Mode Timing Diagram
tKL
tKL
19/23
tZZS
tZZH
tZZR
GS880E18/32/36BT-xxxV
SB
© 2006, GSI Technology
2. The duration of