CY7C1324H Datasheet, PDF (1/15 Pages) Cypress Semiconductor – 2-Mbit (128K x 18) Flow-Through Sync SRAM

CY7C1324H
2-Mbit (128K x 18) Flow-Through Sync SRAM
Features
• 128K x 18 common I/O
• 3.3V core power supply
• 3.3V/2.5V I/O supply
• Fast clock-to-output times
— 6.5 ns (133-MHz version)
• Provide high-performance 2-1-1-1 access rate
• User-selectable burst counter supporting Intel^®
Pentium^® interleaved or linear burst sequences
• Separate processor and controller address strobes
• Synchronous self-timed write
• Asynchronous output enable
• Offered in JEDEC-standard lead-free 100-pin TQFP
package
• “ZZ” Sleep Mode option
Functional Description^[1]
The CY7C1324H is a 128K x 18 synchronous cache RAM
designed to interface with high-speed microprocessors with
minimum glue logic. Maximum access delay from clock rise is
6.5 ns (133-MHz version). A 2-bit on-chip counter captures the
Logic Block Diagram
first address in a burst and increments the address automati-
cally for the rest of the burst access. All synchronous inputs
are gated by registers controlled by a positive-edge-triggered
Clock Input (CLK). The synchronous inputs include all
addresses, all data inputs, address-pipelining Chip Enable
(CE₁), depth-expansion Chip Enables (CE₂ and CE₃), Burst
Control inputs (ADSC, ADSP, and ADV), Write Enables
(BW_[A:B], _and BWE), and Global Write (GW). Asynchronous
inputs include the Output Enable ^(OE) and the ZZ pin. ^The
CY7C1324H allows either interleaved or linear burst
sequences, selected by the MODE input pin. A HIGH selects
an interleaved burst sequence, while a LOW selects a linear
burst sequence. Burst accesses can be initiated with the
Processor Address Strobe (ADSP) or the cache Controller
Address Strobe (ADSC) inputs. Address advancement is
controlled by the Address Advancement (ADV) input.
Addresses and chip enables are registered at rising edge of
clock when either Address Strobe Processor (ADSP) or
Address Strobe Controller (ADSC) are active. Subsequent
burst addresses can be internally generated as controlled by
the Advance pin (ADV).
The CY7C1324H operates from a +3.3V core power supply
while all outputs may operate with either a +3.3V or +2.5V
supply. All inputs and outputs are JEDEC-standard
JESD8-5-compatible.
A0,A1,A
MODE
ADV
CLK
ADSC
ADSP
BWB
BWA
BWE
GW
CE1
CE2
CE3
OE
ADDRESS
REGISTER
A[1:0]
BURST ^Q1
COUNTER AND
LOGIC
CLR
Q0
DQB,DQPB
WRITE REGISTER
DQA,DQPA
WRITE REGISTER
ENABLE
REGISTER
DQB,DQPB
WRITE DRIVER
DQA,DQPA
WRITE DRIVER
MEMORY
ARRAY
SENSE
AMPS
OUTPUT
BUFFERS
DQs
DQPA
DQPB
INPUT
REGISTERS
ZZ
SLEEP
CONTROL
Note:
1. For best-practices recommendations, please refer to the Cypress application note System Design Guidelines on www.cypress.com.
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 001-00208 Rev. *B
Revised April 26, 2006
[+] Feedback